Apr 7, 2017
you probably already told me this but egt sensor is in collector on yours?
Yes @badger5 in the collector. Found the Lambda EGT enrichment map on Ignitron, Not normally used by the looks of it. I already have a WMI system fitted on my A4 road car that I very rarely use so think I may transfer it to the TT and try some water injection. I would like the EGT's to be sensible and under normal road use they are. On those dyno runs at yours the highest seen was around 915 degrees.
I was also babying the car a lot looking at the logs, I am not using the revs at all and changing up around 66-6700 RPM which is what I used to do with the stage 2 K04. Revving out the engine will only make the EGT situation worse though I would have thought. EGT sensor is located where the red cross is.
I noticed that you're not revving it out much at all Karl, it's really obvious from the sound more than anything. it'll be interesting to see how you find the cams open up the rev range.
I watched yours compared to mine last night and it's certainly making more power than I was on the GT30!
On my lap I cross the start line at 102mph, and only reach 129 up the rise. That's button pressed too so 2 bar the whole way up!
You cross the line at 88mph and still manage to reach 132mph, so whatever it's making it's more than I was on the GT30!
Looks fun. Will be good to see how you get on with a few ECU tweaks
The inlet cam I have should hopefully just help the top end breathing a bit. Opening point is the same as the turbo Cams so shouldn’t affect the bottom end and with more lift and 12 degrees more duration will just hopefully stop the torque falling off so quick at the top end. Been playing with virtual Dyno which I have found quite useful to see improvements in power and torque.
Went shopping on Flea bay looking for a new throttle body, didn't want another R32 item as although cheap enough they are 15 years old and more likely to fail. Found a 75mm throttle body as used on the RS4,RS5,RS3 and TTRS and looking at the connector it seemed the same as the original and the R32 item so went for that.
I dismantled the original throttle body to see what the problem was and the spring that shuts the valve had broken, right in the middle of the spring though not at the end which is where I would of thought it would break.
Small problem with the new throttle body, although it has a 75mm throttle butterfly the spacing of the mounting holes is smaller on the RS3 item , only 70mm on the RS3 as opposed to 75mm on the R32. So looks like I had to find some way to make it fit. Either drilling some offset holes in the adaptor plate or remaking the plate. I decided on the easy option and slotted the mounting holes in the new throttle body. So after making sure the TB worked OK with the Ignitron ECU ( which it does) I slotted the holes out 2.5mm on each corner to get the 75mm hole centres.
Interesting stuff Karl.
How did you manage to slot out the holes? They're usually cast the full depth like 30mm or more and quite thin!
Good to hear it's plug and play on the wiring side too, Much like the VR6 upgrade for the AGU setup
I slotted the holes using a course round file, It's only cast ally so not that difficult. If it was steel that would be a different story. There was enough material to let me do this fortunately. This item is about 350 grams lighter than the R32 one so a very slight bonus there as well. I thought as the item was used on turbo cars such as the RS3 and TTRS retention of the hose wouldn't be an issue. Unfortunately on the RS3 and TTRS I have since found out they use a throttle valve adaptor which bolts onto the throttle body and the hose connection to the intercooler is on this.
https://audi.7zap.com/en/rdw/audi+rs3+sportback/rs3/2011-720/1/145-145080/ item 26.
Thus I am having issues getting the boost hose to stop on the throttle body. If the Silverkrin hair spray doesn't work then will need to get some ally welding done like I did on the R32 item.
Small update, fitted the Water injection system. Took the WMI system off my A4 that has had very little use.
I am going to use this to inject water only as I am really just after reducing EGT and hopefully some knock that occurs around 5500-6500 RPM at high boost. On the A4 I used a pressure switch that turned the pump on at anything over 20PSI . Fortunately on the TT I have the Ignitron and there are better ways of enabling progressive injection. You can buy a fancy progressive controller from Devils own or several other manufacturers or use some of the Ignitrons functionality to implement a fully adjustable progressive controller for the cost of a Solid State Relay.
Using the Fuel Rail Pressure controller option on Ignitron, which isn't used normally, I can control the SSR to switch it's output from 0-100% . The output from the controller can be routed to any unused output on the Ignitron ECU. So I used the Evap solenoid output. Extended the wires from the EVAP solenoid to the input connections of the SSR.
The output of these SSR's is a Mosfet and the particular one I chose will switch 20A. I initially bought a 40A cheap Chinese clone SSR40DD off Fleabay and it did work but the heatsink on the back wasn't isolated and was connected to the 12V input. Not very good so bought a used Crydom D1D20 off fleabay.
This works fine and should be more reliable than the cheap Clone. The heatsink is also isolated as it should be.
After some measurements of flow at various percentage outputs I came up with this map to try first.
This will start injecting water when RPM is above 4500Rpm and more than 1.2 bar of boost . I discovered when testing that even with only a 5% output you would get 75% of the output that you get at 100%.
The jet used was a Devils Own number 5 . The atomisation was still good at 5%
5 % 260 mL / minute
Mounted the pump and tank in the car low and in the centre.
The water injector jet is pre TB
Initial tests seem to show this works well to reduce EGT , took about 80 degrees EGT off a back to back 2 bar 3rd gear acceleration run. And also got rid of the 2 degree timing pull that was showing on cylinders 2 and 3. Intake air temps reduced by 4-5 degrees as well . Currently I am using deionised water as had 5L of it in the garage and it's fairly cheap compared to methanol anyway.
Unfortunately when looking at the logs I also noticed that the fuel pressure when running at high revs was not where it should be 3.3 bar instead of 5 bar and 99% injector duty cycle.
Ignitron was doing it's best to hold the Lambda to the specified level but looks like it was close to going into the limp mode
I have configured.
So looks like the DW65v is not happy so it's out to go back to Part-box and the original pump is back in. I have ordered a Bosch 044 and this will be fitted shortly. Hopefully this will mean I can get back to using the car on track again.
the more I see about ignitron the more ridiculously impressed I am by it's capabilities. So much so that I simply cannot imagine a future that doesn't involve my car running on it!
I'd agree that a single DW65 is unlikely to keep up with a G25 660 at 2 bar, I've seen other have similar issues. I think an 064 inline is your friend there, but I'm not sure going back to the original intank is a wise move, as the 044 still needs a decent flow to keep it happy.
Ignitron is a great piece of kit, With all the features and the fantastic logging facilities makes tuning and tweaking the car a lot easier.
I have fitted a Bosch 044 to the car using Bills custom made tails and put the OE pump back in the tank for the moment. Not to difficult to fit really using the tails. I ran a 30A fused supply to the fuel tank and used the power feed to the in tank pump to switch the relay that then feeds the 044. Added a GND point for the pumps as well. Bill suggested a Cupra R filter that I have fitted under the bonnet. They are very much smaller than the OE TT item. Went to a local VAG breakers place by me and they were breaking a mk4 1.6 Golf so managed to get the 90 degree quick fit fuel fittings off that to use on the fuel filter. Filter part number 503440627 £5.41 delivered from CP4L . The Pump was from Fleabay £145 . You have to watch out there are loads of dodgy pumps on there, this is from an authorised seller and I have checked the hologram part number against the Bosch protect web site.
The OE filter on the TT is well big.
Comparing the OE filter with the Cupra item. The Cupra filter fits nicely.
You can see the pressure sensor in the line just before the filter. Previously the sensor was measuring pressure after the filter . Pressure seen at idle is about 0.2 bar higher than before. There will be a small amount of pressure drop across the filter but the main difference is the 044 is doing the business and shifting fuel.
Didn't take a picture of the pump installed just the before piccie with the filter. You can see there's lots of room with.
Pushed a fish wire down from the pump relay to the pump and pulled the pump wiring through.
The pump is a good deal louder than the OE pump. Quite noticeable at idle but once driving you don't really notice it. I have a few ideas on sorting this.
These kind of pumps when used on cars typically have pulsation dampers or accumulators to try and smooth the fuel pressure pulses.
when I fitted the Original TT pump I did some testing and the TT pump managed 4.3 L flow to an open pipe in 90 seconds. The duff DW65 managed 5.1L on the same test. The DW65 flow is well below what it should be doing and has gone back to be exchanged under warranty.
The Bosch flows about 7 litres of fuel in 90 seconds at 3 bar looking at the stats, a lot more than the OE pump can flow to an open pipe.
I took the car out for a drive with the old TT pump on and did a 3rd gear accel run. It went into limp mode around 7K RPM when Ignitron detected the Lambda being higher than I had set. Maximum Lambda is set at 0.86 and it made it to 0.9 just before 7K. I pretty much expected that, the reason I had the DW65 was because the OE pump couldn't cope with a stage 2 275bhp tune.
Looking at the logs the original pump managed about 4.1 bar max and fell to 3.4 bar when it should have been around 5 bar. Injector duration had hit 100% trying to maintain Lambda at target.
This is the log from the run on the dyno at Bills with the DW65 in better health. Peaks about 4.7 bar and then falls away to 4 bar.
And this is the Bosch with the original 17 year old pump in the tank. Pretty much holds 5.2 bar all the way through .The OE pump just has to supply enough low pressure fuel to the 044. I will probably drop the DW65 back in the tank just as it will be more reliable than the original pump . There is a possibility it may make the 044 a little quieter as I suspect some of the noise is due to cavitation due to restriction on the intake. Will be having a look at maybe controlling the voltage on the pump to reduce it's speed at idle and cruise.
Good stuff Karl. I look forward to exposing a multitude of mechanical issues on mine once I have the full logging capability if ingitron
Booked some track time for the car. Out at Curbrough on Bank Holiday Monday the 26th with the Chequered Flag group, Looks like a mix of cars, be interesting to see how the TT goes since the power upgrade.
Booked the 4th September at Donnington for the day with Javelin. Hopefully have the water injection fully dialled in for then so can get the full use out of the engine .
Looking to take it for a run out at Santa Pod for a laugh to see what it will do. Probably the GTI Action event in October after I have sorted the cam out and done a bit more tweaking.
Refitted the new DW65V pump that Part Box sent back to me in place of the original TT pump. This has sorted the noisy 044 pump issue.
Old TT pump
And the new DW65V, much quieter and almost inaudible in the car .
Do have a slight issue with the new DW65v and Bosch together they are putting so much fuel through the pressure at idle should be around 2.5 bar, it's more like 3.1 bar as the OE regulator looks like it can't handle that much fuel being thrown at it. The Ignitron works around this and has resulted in changes to the VE map. I may use one of the auxilliary outputs on the Ignitron and drive another SSR to regulate the Bosch pump at idle. Once the turbo is making positive pressure and the engine is using some fuel the fuel pump pressure regulation is pretty much spot on.
Did a sprint event at Curbrough on the Bank Holiday Monday. Had some fun and the car came back in one piece so that was a plus. Wasn't sure what tyres to run as done Curbrough before and they were only 30 second runs so didn't have enough time to get any heat in the tyres. Different format on this event with a much longer lap and it was well warm in the afternoon, should really have put the track tyres on.
Had a few issues with the Boost pipe popping of the throttle body so most of the time running 1.8 bar with the odd lap in the afternoon at 2 bar but it well hot then .Will be getting some ally beads welded on the TB. Temporarily fixed with tie wraps.
Water injection worked fine, EGT's never went over 910 degrees ,and intake temps were sometimes lower than ambient and they were starting off around 60 degrees in the afternoon as the car was sitting in queues, CSF rad is a great piece of kit coolant temps never went over 95 degrees despite all the time sitting in queues and the slow average speed around the track.
There were a good mix of cars there from a 3 wheel Morgan, Peugeot 206 GTI, M3 BMW, Nissan Skyline, Golf track cars etc.
Fastest car of the day was a Kit car that looked like a small Caterham / Severn. Apparently 500Kg and a 200bhp FJ1200 bike engine in it, I was 0.4 seconds slower on my fastest lap and that was a 127.8.
An in car video off my phone using the Harrys lap timer app.
Did a track day at Donnington last week. Despite the weather forecast saying just a 5-10% chance of rain it was raining all the way there and only stopped around 09:00. It was a Javelin track day and there was a very good mix of cars. They also have a resident photographer on these Javelin track days now so got a few decent photos.
Didn't record anything in the first session as it was still a drying track car was going very well though overtook 2 of the Nissan GTR's that were out on track at that time.
Second session was a dry track, I let some air out of the tyres as I expected higher temps but should of let some more out though as the rear was getting skittish on the later laps.
Last lap on that session thinking about coming in and I had a bit of a trip through the gravel at Schwantz / Mcleans.
Unfortunately several pieces of gravel broke the passenger side window and the drivers side mirror along with a nice crack on the windscreen.
Good job these are old cars, A replacement mirror cost me £17 delivered and picked up a complete window winder mech with glass for £30 from a VAG breakers just down the road. Really love how easy it is to change out things like the mirror, A 10 minute job to replace the complete item without having to remove door cards etc.
The screen I will do through the insurance as it's MOT is due next month. The one on the car is the original and is going around the top edge anyway.
Captured the spin on Ignitron as I was logging the session.
You can see the two unloaded inside wheels partially lock up as I braked and kicked the ABS in. I look to have braked a little earlier than previous laps when still on the corner so Rookie mistake 1.
Good news is I can run full boost all the time when on track with the water injection. Brakes are great, Engine and coolant temps well under control, coolant temps never went over 90 degrees and oil temps hit 110 max. just need some more practice to improve the driver.
Fastest car on the track
Changed the intake cam several weeks ago now. Fairly easy job to do as you don't have to retime the engine. The cam belt connecting to the exhaust cam.
Just get a new gasket for the VVT tensioner and I reused the rocker cover gaskets as they are fairly recent.
I bought a complete cylinder head for £80 from a scrap yard off a 1.8 NA A3 with an APG engine.
This is the later engine with VVT . I only wanted an intake cam as I am not sure an exhaust cam change as well would make that much difference. And not changing the exhaust cam means an easier swap.
From Cat Cams site both fast road and ultra fast road have same exhaust cam 217 degree 9.95mm standard turbo exhaust 210 degree 9.3mm NA exhaust cam 210 degree 10.4mm . The CAT cam exhaust cam has only 7 degrees more duration and 0.7mm more lift than a BAM exhaust cam.
The AGP NA cam actually has more lift again than the CAT cam item with only 7 degrees less opening.
There are several threads around with the details of various cams and the timing of them .
058109021 = ADR und AFY 8,78mm, 210Â°, 4Â° n.OT
058109021.B = APX, ANB, AEB,APU, AJL, AGU, AQA, ARZ, AJQ, APP, APY, AUL 7,67mm, 190Â°, 18Â° n.OT
058109021.K = ADR, APT, ARG, AVV 8,41mm, 202Â°, 16Â° n.OT
058109021.M = AWT, AUM, ARX, ARY, AUQ, AMK, BAM, AUL, APP 7,67mm, 190Â°, 18Â° n.OT
058109021.F = AGN, APG 8,41mm, 202Â°, 18Â° n. OT
058109021.E = AWB 8,6mm, 207Â°, 9Â° n.OT
058109021.D = ADR, AGN 8,41mm, 202Â°, 12Â° n. OT
058109022.B = AQA, ARZ, AJQ, APP, APY, AEB, APU, ANB, AJL, AWT, AGU, AUM, ARX, ARY, AUQ, AMK, BAM 9,3mm, 210Â°, 10Â° v.OT
058109022.C = ADR, AFY, APT, ARG, AVV 10,25mm, 210Â°, 8Â° v.OT
058109022.D = AGN, APG 10,4mm, 210Â°, 8Â° v.OT
v.OT = vor dem Oberen Totpunkt = before Top Dead Centre
n.OT = nach dem oberen Totpunkt = after Top Dead Centre
Had to undo the V bands on the turbo and swing the compressor back a little as the outlet was stopping the rocker cover coming off. Got to love these V-Band turbos so easy to work on.
Set the cam timing marks to the correct place and marked the chain links with the 16 link spacing .
Remove all the cam caps carefully noting location, they are all marked anyway, and remove original cam.
Looking at the cams you cannot see any difference. The original BAM cam marked with an L the new APG cam marked AC .
I did take some measurements with a vernier on the cam lobe maximum height and the base circle diameter.
Measured height of lobes on both cams.
BAM original cam marked with an L
Maximum height lobe width
43.62 36 outer lobes of each threesome
35.4 centre lobe
APG cam marked ac
Maximum height lobe width
44.35 36 outer lobes of each threesome
35.4 centre lobe
Calculated extra lift 44.35 - 43.62 = 0.73mm from specs above 8.41-7.67 = 0.74mm
So seems to me specs above seem correct as regards the extra lift.
Engine definitely pulls stronger at the top end and is keener to rev than it was before. Virtual dyno third gear pulls seem to show 30-40bhp more at the top end so hopefully this will show up on the dyno next time it runs.
Well took the car to Badger 5 today for a run on the dyno to see what it was now making.
Seems I have lost some spool from a combination of the intake cam extra overlap and also a richer mixture I mapped in when it was spooling. My bum dyno and virtual dyno results seemed to indicate it was slighly better but will have a bit more of a play with this part of the map.Water injection didn't improve power but it did reduce EGT's which is why I put it on there. This plot is without water injection.
Really happy it made more than 500bhp as I had a target of 500Nm and 500BHP which it has hit.
On track car will be running 1.8 bar most of the time which only makes 460 odd bhp. Just a press of the race mode button on the steering wheel takes you to the top boost map.
Nice track Donnington, been there in the M5. The "s curves" are interesting given you are braking from a serious speed!
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Took the car to Santa pod on Sunday. All the Saturday running for a big show the previous day had been cancelled due to rain. So it was absolutely rammed with people wanting to get on the track. So only got 3 runs in all day. It was cold, tyres were stone cold and the 3 degrees of camber on the front wheels don't help traction.
Was hoping for something around 11.5-11.8 as that should be doable with the spec of the car. Fastest run was my first with loads of wheelspin and no anti lag managed 12.15 at 122mph.
60ft times are pretty poor and should be more like 1.8-1.9s or better.
Second and third runs I used the race mode switch with launch and anti lag. The anti lag works great you can here the shifts are almost seemless in power delivery. I am nowhere near aggressive enough with the launch control settings as on the second and third run the car bogged quite a bit. So I think the car definitely has an 11.7-11.8 in it on a warmer day with some warm tyres and a decent launch setup. I plan to reduce the front camber a little as traction on the road is an issue quite often when accelerating quickly. On the second run I kept accelerating after the finish to see how quick it keeps going .
Removed the rear wing as it just creates drag at a 1/4 mile strip, also added a switch so I can turn on the fans to full speed at any time to cool the intercooler and engine down a bit.
1st run No launch control or anti lag just give it some welly with stone cold tyres, cold track = monster wheelspin.
2nd run using launch control and anti lag. I didn't really play with launch control much to set it up. It was nowhere near aggressive enough. Kept my foot in after the line to see how it kept pulling.
3rd run tweaked launch control a bit but still nowhere near aggressive enough. And the track was very cold now.
I plan to take some of the camber out of the fronts as wheelspin is an issue regularly when accelerating hard,may also go back to Santa Pod nect year when it's a good bit warmer and I have worked out some better settings for the launch control and boost by gear set up on Ignitron.
Some other stuff there, an RS V8 powered shed, I have seen this before it's based on a 2.8v6 Passat originally. Managed a 2.6S 60ft and 17.1 at 84mph.
and a nutter on a jet powered shopping trolley.
Good terminal speed there Karl - congrats on breaking the 500hp mark
Keep up the good work.
Yeah me too!
Few cheap mods to the car. Bought a replacement intake pipe to lose the silencer part of the standard intake. Not going to make a great deal of difference to ultimate power but probably worth a few bhp at the top end. It's nearly 1Kg lighter as well.
Just under £30 delivered (they have offers on just watch the item) , and a straight swap.
Changed out the rear pads to replace the EBC red stuff one I had been using. The rear brakes don't do that much normally but since changing the rear caliper to a larger piston size they definitely do more work when braking. The red stuff pads not really done that much mileage. The outer pads look to have got a bit warm.
Awesome thread, i've just bought a MK1 TT to play with so i'm glad i found it
Need any help just drop me a PM . Like your choice of the other car.
Ha ha I'm sure i will be, for now i'm just reading. Just stripped everything down as far as i can and replaced all gaskets and seals and cleaned the engine bay up.
Took the car to Silverstone on Saturday for a track day with the Circuit Days people. Never been on the National circuit before so that would be a bit of a challenge. Weather this time of the year also a challenge and it looked like it was going to rain in the morning and be sunny in the afternoon. So kept the normal road tyres on and loaded the boot and car with stuff. The TT is not really a practical car, I am used to estates. With the roll cage it's even less practical so 2 tyres in the rear, take the passenger seat out and put 1 tyre behind the seats and 1 tyre in the passenger seat.
Put the 25L jerry can of fuel, Trolley jack, tools and various other stuff and ready to go. I booked a garage as I figured the weather would be dodgy. I just wished my garage was this big.Nice polished ceramic tiles which were fairly slippy when wet. There was mine and one other car in this garage.
My Dad came down and had some passenger rides as well as one of my other mates @bhodgkiss . Also @jojo who has tracked an S3 for many years to get his opinion, It was very wet in the morning when the track opened. I left it for 15 minutes to let the rush die down and just as I was going to go out the track was red flagged. A pretty new 911 had aquaplaned on the pit straight and spun a few times before coming to rest in the wall at copse.
Ambulance was out with the recovery trucks etc.
@jojo at the wheel for some sighting laps, terribly cheesy smile from me in the passenger seat.
The Circuit days people organise a photographer to take pictures that you can download for free. Essentially it's free advertising for them as they will get posted all over social media. The car was pretty epic straight off, the suspension and geo tweaks I have done recently really paid off. Car is more neutral handling, less roll and more straightline grip for breaking and traction.
Took a few laps to get past this LP560 Gallardo , 560bhp 202mph supercar, Eventually he made a mistake a copse and I out dragged him to the next corner. My car doesn't have ESP on it's coded out as it gets in the way too much on track. Looking at the way his car was moving around I suspect that his ESP was doing it's best to keep him on the track.
One of the boost hoses popped off on the drivers side by the tow hook point when I went to use the push to pass button for the first time, this puts it on the top map. Reasonably easy fix to get the hose back on and just left it on the lower 1.8 bar map for the rest of the day. This is what it runs 95% of the time on track about 460bhp .
Winter project is to replace all the odd sections and hoses with some one piece ally pipes.
I did have 2 spins myself, If your not spinning you aren't trying hard enough . The first was caught by the photographer, I was trying to outdrift the BMW's but it didn't work.The second I was chasing down a Lotus Exige and got a little carried away into copse corner and spun. Caught him up a bit later and passed him outdragging it down the wellington straight.
Over took various M3, M4 BMW's GT3 , 911 porsches etc and only got passed by one other car which looked like a race spec GT3 with Michelin wet race tyres. And he wasn't that much quicker than me.
Some videos I uploaded to you tube.
This one is an amalgamation of several runs with the good bits at normal speed, spins, passes etc and passing everything else 5x speed .
When it dried in the afternoon I put the road legal semi slicks on and tried to do some fast laps. The track had a dry line around most of the circuit but off line was still a bit greasy and it was only about 3 degrees. Using Harrys lap timer did a 1.09 lap but just as I was getting into the groove had to come in for some fuel. And just as I went to go out the track was closed as the light was fading.
Packed up and because my normal road wheels and tyres are slightly smaller only 8 inch wheels as opposed to 8.5 got 3 wheels in the boot and one in the passenger seat. Result.
Set off home happy that the car was in one piece and nothing broke and managed to get up the M1 as far as the junction with the M6 and the car started missing and losing power. Looking at the Ignitron display I could see fuel pressure was low and within 10 seconds the car had cut out. Coasted to the side of the motorway right where the exit lanes are for the M6.
I have a cut out switch for the fuel pump and went to check this and burnt my finger, so figured I had found the problem. The toggle just flopped around the switch was knackered.
Fortunately only took about 15-20 minutes or so to find the tools, torch and get the switch out so I could short the connections . When I went to start the car the battery had gone flat due to the lights and hazzards being on. So had to call AA out to jump start the car. The AA man was happy it was an easy job and after I had moved the car off the motorway we spent 15 minutes talking about track cars as the car idled to charge the battery, he has a 172 clio track car, LOL.
Thanks for the passenger laps Karl, very very impressive as always with your projects
Making a few upgrades to the car for this year. Started by buying a new coffee table for the living room.
The wife said she didn't like it so decided to fit it to the back of the car, Minus the Revo stickers as I mapped it myself.
Can't see why your missus didnt like the coffee table, looks fine to me
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Few more aero upgrades added over the two weeks.
Modified the front wings so they vent at the rear. This allows the high pressure air in the rear of the wheelarch to be released . This excessive air pressure causes lift and also increases drag. Best thing about this mod is it's free.
Remove the wing and trim the rear of the wing to remove the large return edge and the lower bracket. The wing is held in at the bottom to the sill by a bolt.
Modify the top mounting points by slotting the mounting holes , You can leave the front mounting bolts alone. You need to remove the thin plastic liner behind the main arch liner if you want any air flow through there.
I modified the arch liner by cutting the top part out so air could flow through there. I tried removing the liner completely but all the rubbish off the roads just ends up filling up the door shut and making a mess. So put the liner back. Also cut a small piece out the top of the wing at the back and removed the black plastic moulding at the rear of the bonnet . This allows air to flow from under the bonnet out the slot to help vent the pressure under the bonnet.
Hammerite smooth silver is a very close color to the car so use this for painting over cut edges.
Onto the bonnet and fitted a FORD part to the car. A genuine bonnet vent off a 2010-2014 Ford Mustang Shelby GT500 .
Ordered off Fleabay from America. The actual part was only about £90, with postage and import duty came to around £130.
Which for what it is I think is still quite good.
It could have been made for the TT as the curve across it is the same as the bonnet . Just a matter of making a template and deciding where to fit it. Then making a small incision in the bonnet.
Found this video on making a template to fit this.
Mark out template onto bonnet and apply masking tape around it, I used 2 inch normal white painters masking tape then overlaid some gaffer tape which is a lot thicker and stronger. Don't try sticking gaffer tape direct to the bonnet it's difficult to get off.
15 minutes with a 4.5 inch angle grinder with a nice thin metal cutting disc. fortunately the bonnet is aluminium so easy to cut and no sparks so put a towel over the engine bay under the bonnet.
I cut the two plastic tabs off at the rear of the vent and made provision for a small hole for the single mounting stud on the rear. On the Mustang there are 3 location grooves on the front edge mounting with corresponding mouldings on the vent. I removed these small bits of moulding from the front mounting groove with a dremel.
Removed the thin rubber sealing strip from all around the edge as this would make the grille stand up off the bonnet a little more. The bonnet vent has fixing tape at the rear which I used along with some tiger seal around the sides and across the two clips I had removed and under the area where the bolt is. Trying to make the area watertight so rain running down the bonnet will run around the vent.
Nice one Karl!!
Hope it will dissapate some of the heat under there, which in affect reduces intake temps
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