Turbo upgrade :)

ye ive just looked at the part catalog.

The "Thrust sensor" as they call it, is fitted to most of the transverse engines and B6 A4's but not B5's.

Weird!

Reminds me i need to fix my Boost control system. I have some fault code about "N75 open circuit", not sure if the valve itself is humped, or if its a wiring issue though.
 
Byzan A4 said:
I am hoping that this is a glitch at the tuners as I have heartily recomended a certain tuner and almost feel guilty that other users are having problems, as such i am actually attempting to help them as best as i can myself. I myself have probably spent around £800 (Over an extended period on both cars) getting all the tuning done so i hope that this can be rectified
Click to expand...

No need to feel guilty Mark.. you know that I'm cool with you. When you recommended them you had only ever had good outcomes to any tuning that they had done. Plus you've been like an agony aunt over the festive period which I appreciate :friends:
 
No probs Lee, what time you booked in? As we are hoping to get the S3 (Tuftybloke) there to get his map removed on saturday if we can get in
 
i'm wondering if these folks have anything to do with CustomCode?

There was a couple of threads on rs246 or audisrs about an S4 with a custom code map that was acting very oddly, and the dealers seemed less than helpful

In the first thread, the guy'd had his car mapped and thaught it wasnt 100% so stuck his vagcom on it and did some logging runs, it appeared that the ECU was cutting the throttle right back once the engine came on boost (S4 is DBW so the ecu will cut the throttle when it detects overboost and suchlike), and the MAF readings were well down on what the tuner had claimed the map was making. The dealer then took the hump with him putting these logs on the forum and asking for peoples opinions and refused to do anything more to the car.
The second thread was similar symptoms, thottle cut at WOT, and people on the forum basically said "dont talk about it on here if you want the dealer to help you, look what happened to this guy" with a link to the original thread.

I didnt follow it up to see what happened, but clearly there is something a bit iffy with their maps if they're causing throttle cut and the company is then taking a hissy fit when their customer asks what other people think is going on!
 
I thought CC were supposed to be reputable etc, i was going to go with them once as i felt the repuation was second to none.However it was a cost issue for i as they wanted much more for a similar/same product as the company i eventually used.

However MAF reading are not to be relied upon 100% as they can be re scaled, mine has been, i peak at around 170g/s iirc ,but the dbc maf/ecu peak out at around 180g/s anyway hence the rescale. I can guarantee you my car is making much more( when it was working) than the MAF would suggest
 
Afaik the S4 MAF is good for 330g/s which is something like 400hp. The car in question was within the range of where the MAF should be operating normally. No idea what they'd done wrong, and seeminly they werent willing to admit it either.
 
Byzan A4 said:
No probs Lee, what time you booked in? As we are hoping to get the S3 (Tuftybloke) there to get his map removed on saturday if we can get in
Click to expand...

I'm booked in for 12.00. I read Tuftybloke's thread yesterday and it does sound very familiar unfortunately. Let me know if you manage to get booked in.
 
Hmmm, they told him they not there on sat as they going to NEC, might be worth a double check on your reservation mate
 
Moved to Saturday 17th now @ 10am.. cheers for the heads up mate.

Apparently somebody could've been there for diagnostics but they'd prefer to have their mechanical bloke there too.
 
I hope Chipped UK manage to sort my boost issue out on Saturday..

Got beaten by a Saxo VTS last night :box:

I was on a private dual carriageway and he flew up besides me and gave me the look... I stamped on the fast peddle and lost power to be left for dead!! I bet he p!ssed himself lol
 
OUCH !!
Last time i got left by one of those i had the old NA 1.8 in it still

GL lee, Tufty in first thing on Sat morn
 
TBH a VTS isnt that slow when compared with a stock 1.8T...

They have 120hp and 935kgs (ie 130bhp/ton) vs the A4's 150hp and 1250kgs (120hp/ton), plus being non-turbocharged will mean the throttle response is a bit crisper.

Few months back craig was driving our car and we had a little play with an '05 Fiesta Zetec-S, which is only 102hp and 975kgs (106bhp/ton), now fair enough the A4 was 2 up with tools in the boot and he was alone, but there was nothing in it at all, he wasnt pulling away and we werent catching him.

once chipped it would be a different story though.
 
Update..

Got to Chipped UK on Saturday to find they hadn't actually booked me in!?! This said they made every effort to get my car in asap and spent a fair amount of time on diagnostics without charge so I can't complain.

After a couple of rolling road runs.. using the new map and standard they identified that the issue is being caused by a faulty boost control solenoid/N75 valve. They said that they are certain that this is the problem.

The N75 on there currently is under a year old so I was surprised to hear the outcome but will be fitting a new valve asap which will hopefully solve the problem.

I called Leicester Audi and they had an N75 (058 906 283 F) in stock so I walked round and collected as they are almost next door to work.

Watch this space...
 
I'm going to get my torch out and fit it now!!! Really hope it works.. fingers crossed please everyone!!
 
Now I'm getting seriously fcuked off!!!

Seems there is no remap at all!! I'm hitting 0.5 bar and just stays at that!!

No random power loss like before, no fault code and pretty much factory standard boost!!!!!

I was hitting 0.8 bar before the map!! Absolutely gutted and to be honest I don't know what to do now??? Spent a fortune on map, new dv valve spring, new N75 and achieved nothing!
 
Pull the hose that goes to th actuator and try that see if it boost wildly then,that will indicate the wastegate is sealing at least.

I am gutted for ya mate WTF they playing at, its obviosly not limp mode as there are no codes
 
Yeah.. I'll check it. It'll have to wait until tomorrow now as I think my girlfriend might kill me if I spend much more time with my car.

Is just like the standard map now. I'm concerned as they did say they'd removed the map for testing!!! Did it go back on again???
 
I'm not sure what exactly changing the N75 was supposed to do. What exactly were they seeing that made them think it was faulty? The only two things i could see being wrong with it is a) allowing boost spikes, which would push the AFM reading out of range, but would also be visible on the boost guage, and b) no boost at all.

Be VERY careful driving the car with no actuator feed connected. It would also be an idea to test it with the N75 bypassed, ie connect the vacuum line directly from the inlet to the actuator. If theres no difference in boost between the current setting and the directly connected mode, the chances are theres some kinda wiring issue to the N75, but i'd think that would bring up a fault code, as it did on our car...
 
i wonder if the hybrid turbo means the motor produces more boost earlier than the normal K03... if the boost climbs too quickly, or earlier than the ecu expects, especially as the motor has no MAP sensor, even if its within the range that the N75 is requesting, then it would think something odd is happening and cut the power...
 
I forgot to mention about drive careful, it should boost like a demon then maybe fuel cut, at least that should prove the wastegate etc
 
aragorn said:
I'm not sure what exactly changing the N75 was supposed to do. What exactly were they seeing that made them think it was faulty? The only two things i could see being wrong with it is a) allowing boost spikes, which would push the AFM reading out of range, but would also be visible on the boost guage, and b) no boost at all. quote]

Yeah, They said that it wasn't functioning correctly/controlling the boost causing the boost to spike and hit the limit!.. I did think that this would've shown on the boost gauge but if the boost is gauged from maf readings then possibly the ECU would pick up on this before the manifold (boost gauge 'T')???

Anyway.. anyone want a hybrid turbo?? One careful owner.. never been to full boost (for long)?
Click to expand...
 
audi upgrades
i'm just wondering if the problem isnt that the N75 wasnt controlling it, but that the hybrid was building boost too quickly.

Even if the boost doesn't overshoot the requested setting, if it builds faster or earlier than it would normally, the ecu will just see the AFM readings rise and think something is wrong. If thats the case though, they should be able to adjust the map to allow the higher boost values at lower rpm's

Do you have it booked back in? If it is running stock boost, perhaps they did just remove the map to try to ensure the engine was running ok at stock. Was it running in the low boost mode before you changed the N75? or did it go from fuel-cut to 0.5Bar after changing it? if so then perhaps the valve was faulty?
 
You know what I kicked myself last night...

I didn't let the turbo build up any boost after my diagnostic to check if the fault was still present I just assumed it was. I'd already removed the old N75 when I realised that I'd not checked it!!!

I could refit the N75 to check though.

They were fully aware that it's a hybrid turbo and I assumed the whole idea of the 'live' map is to get everything running correctly and at peak performance!?!

It def spools up much earlier than a standard K03 even with standard map.
 
Not booked in yet as I wanted to check the actuator before I call them.. Although it made well over 200hp on the first run so I assume the actuator is fine.
 
well now that you've replaced it, get back down to them and get them to sort it, or get a refund for the map and go elsewhere.
 
Why can they not just get it right, how hard can it be????
*** Lee i am so sorry mate about all these problems, i would never have recomended them otherwise to you.

Stupid question time i assume the N75 is in the correct way? IE ling tube in the TIP?

Not saying you don't know what you are doing, was clutching straws as a guy at the last rolling road day did that with his passat
 
Byzan A4 said:
Why can they not just get it right, how hard can it be????
*** Lee i am so sorry mate about all these problems, i would never have recomended them otherwise to you.

Stupid question time i assume the N75 is in the correct way? IE ling tube in the TIP?

Not saying you don't know what you are doing, was clutching straws as a guy at the last rolling road day did that with his passat
Click to expand...

What's ***?

Seriously mate I don't blame you at all.. you weren't aware of any issues.

You trying to say I don't know what I'm doing? lol.
Yeah long end in the TIP.

Surely it would be running like a pig with the N75 in wrong?
 
that is the problem with firms who have generic maps they tweak slightly without having the ability to "re map" properly.
I don't know but would guess they are a bit out of their depth with an unknown quantity.
Maps tend to be written around specific turbo capacity and fuelling (either pressure or injector size).

I would defo get my money back, do they not test all this before releasing the car to you?
what happens if you completely screw something up becasue the map isn't right?do they rebuild it for you?

sounds a bit suspect
 
jcb said:
that is the problem with firms who have generic maps they tweak slightly without having the ability to "re map" properly.
I don't know but would guess they are a bit out of their depth with an unknown quantity.
Maps tend to be written around specific turbo capacity and fuelling (either pressure or injector size).

I would defo get my money back, do they not test all this before releasing the car to you?
what happens if you completely screw something up becasue the map isn't right?do they rebuild it for you?

sounds a bit suspect
Click to expand...

Yeah I think that's going to be the next route to be honest as I'm not really happy to let them guess their way a to a solution anymore!

That is my main argument.. a car shouldn't leave their workshop with any unidentified faults and it should def be made clear to all customers that this is the likelihood. From what I've seen a majority of 1.8T go back with issues!!!!!

VERY SUSPECT!?!?!?
 
Just disconnected the actuator and my car was stupidly fast.. didn't really take my off of the road but I'm fairly sure it went off the scale at 2 bar/29 PSI ish!!!
 
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