Star Performance Testing Day – Pt4 N75s

Prawn

There is no point fitting a J valve after a remap when you haven't had it done yet. You may aswell get a custom remap and speak with the tuner to incorporate the gain your J valve would have given.
 
interesting. i was under the impression that if a car is mapped with the J valve in place, it will give exactly the same boost as if it were mapped with the standard valve. thus the remap would totally negate the increased boost of the J-valve.

im sure there were a few threads on this when i joined back in november. many people saying fitting the J valve before a remap was pointless, as the remap would work around the increased boost of the N75 to deliver the boost the map was inteneded to run.

sorry if that sounds a little confused, it makes sense to me, sort of!
 
Prawn said:
interesting. i was under the impression that if a car is mapped with the J valve in place, it will give exactly the same boost as if it were mapped with the standard valve. thus the remap would totally negate the increased boost of the J-valve.

im sure there were a few threads on this when i joined back in november. many people saying fitting the J valve before a remap was pointless, as the remap would work around the increased boost of the N75 to deliver the boost the map was inteneded to run.

sorry if that sounds a little confused, it makes sense to me, sort of!
Click to expand...

Yes you're right which is what Jam was saying :)

Mike at Jabba told me this personally, he preferred the C valve as fitted to early ECU's (non drive by wire) as it helped with a flatter torque curve...

Fitting the J valve post map DID make a difference but I was overboosting and hitting limp.
 
I ran the 'J' in a remapped BAM engined TTR for most of the summer last year. My experience was that it was fine (and made the portly TT quite savage), until about November or so when it kept going into limp... Vagcom reports
17963 - Charge Pressure: Maximum Limit Exceeded
P1555 - 35-00 - -
Click to expand...
and occasionally accompanied with
16487 - Mass Air Flow Sensor (G70): Signal too High
P0103 - 35-10 - - - Intermittent
Click to expand...
In my situation the car effectively became boostless. To resolve was a few seconds with VagCom to reset. Since then I've swapped back to the standard N75.
 
Ok so summarizing, all the engines but the AGU go into Limp with this mod? a N75 J in a chipped AGU will make any difference?
 
dubbers said:
I ran the 'J' in a remapped BAM engined TTR for most of the summer last year. My experience was that it was fine (and made the portly TT quite savage), until about November or so when it kept going into limp... Vagcom reports

and occasionally accompanied with

In my situation the car effectively became boostless. To resolve was a few seconds with VagCom to reset. Since then I've swapped back to the standard N75.
Click to expand...

Exactly my experiences...although it was safe for the engine for me to run an alternative N75, it made the power delivery very savage...and kept hitting limp mode.

I too had to reach for VAG Com to get any boost back...
 
I found the J valve a lot more aggressive on boost and initially would hit limp mode but as you get used to it there was a way of driving round it.

It also helps if you have APR software with fault code reset as it's just a matter of dipping the clutch and running through the reset feature after hitting limp
 
AndybS3 said:
I found the J valve a lot more aggressive on boost and initially would hit limp mode but as you get used to it there was a way of driving round it.
Click to expand...

On mine, with the J valve fitted, it would hit limp if you drove at small throttle openings and let the boost build slowly...if you dropped a gear and mashed the throttle open wide, you were safe.
Fine on back roads...not so good on Motorways.
 
AndyB, where you up at Knockhill on Saturday in the 340R?

There can't be many of them in Scotland!
 
Exactly the same here Glen.


Wasn't me at Knockhill mate, still too chilly yet for my liking, seemingly there's about 6 340's in Scotland 3 or 4 of them in Aberdeen
 
can't help it...i love your car mate!!! next time you take a drive give it one for me...
 
AndybS3 said:
seemingly there's about 6 340's in Scotland 3 or 4 of them in Aberdeen
Click to expand...

Really?
Never seen any about...

I know a lad with an Atom...but don't know of any 340 owners.

In saying that...there are a lot of rare and expensive cars 'hidden' in Aberdeen...more so than most people think.
 
I was talking to another Scot on one of the Lotus forums from Aberdeen Glen who had one and he mentioned there were 3 or 4 up there.

They really are for the track alone and good weather, most if not all will be tucked up in a garage until Summer
 
Guys this looks like something id like to try but im concerned about limp mode... if my a3 hits limp mode, will it last just a few mins or will it stay in this mode until it is physically reset with vag com?

Cheers for all the interesting posts on this one lads!
 
if you switch the ignition back off and on usually resets the limp mode
 
Thinking about doing this but can someone give a clear answer, how do you get rid of limp mode if your car goes into it?
 
I miss reading techinical stuff like this... Hopefully matt will give a detailed report on what his car is running so we can all have a very interesting read!
 
What do you do if you havent got vag com? Are you sh*ted!
 
Nono, if your car goes into 'limp home' mode, all you need to do is switch the car off and then back on, and it will be back to normal.
It's will probably log a DTC which will com up in a Vagcom scan, nothing to worry about unless you have actually broken something.
 
Thanks jojo, thats all i needed to know, didnt want the car togo into limp mode an leave me up sh*t creak
 
jojo said:
Nono, if your car goes into 'limp home' mode, all you need to do is switch the car off and then back on, and it will be back to normal.
It's will probably log a DTC which will com up in a Vagcom scan, nothing to worry about unless you have actually broken something.
Click to expand...

That question has been asked many, many times, and to my knowledge, no one has actually answered it properly. Nice one Jojo:icon_thumright:
 
The thing is, if you do the N75 valve mod and it puts your car into limp mode and you reset it by turning off and on again, limp mode will come straight back again unless you revert the valve mod back to standard again.
 
Westle said:
The thing is, if you do the N75 valve mod and it puts your car into limp mode and you reset it by turning off and on again, limp mode will come straight back again unless you revert the valve mod back to standard again.
Click to expand...

It will go back into 'Limp home' mode after a reset if you decide to drive it like a loon again straight after you restart it. It usually only goes into limp mode when the ECU detects a boost spike or something similar, which is what the changing of the N75 does to trick the car into a wallop of torque, though I stand to be corrected.
 
Not so much on the APY S3s apparently. Ive read this on more than one occasion, but it could be hearsay.
 
Your right vetch, its been asked acouple of times in this post and no one answered it, cheers jojo
 
vetch said:
Not so much on the APY S3s apparently. Ive read this on more than one occasion, but it could be hearsay.
Click to expand...
my apy is fine been runing mine for some time i had to bypass my n249 valve though for it to run smother but think it was because the valve was knackered more then because i had the 75j fitted
 
Happened with my 01 AMK engine when I fitted the J.
 
thats what i was wondering fran? i've got an amk too so wanted to know what peoples experiences were
 
hi just wondering what would be the best n75 for my amk 210 s3 as i dont have a clue with everything iv been told is dif wih them on dif engine modules just think its on its way out thats all tar
 
s3gazz said:
hi just wondering what would be the best n75 for my amk 210 s3 as i dont have a clue with everything iv been told is dif wih them on dif engine modules just think its on its way out thats all tar
Click to expand...

Std F valve

<tuffty/>
 
I have gone from standard F valve to J Valve over the last few days with an APY engine code. (Let it be known that I was told not to but when your as green as grass you like to try all the options what everybody else has already tried but dont listen to what people say lol, a bit like my 18 year old son lol) I fitted it the wrong way round to start with and hit limp mode 2wice in half an hour and then fitted it right way round and everything was hunky dory could notice a real change but then the sh@t hit the fan and hopefully i dont have big problems I will start a thread 2morrow to find out
 
cecilthesausage said:
I have gone from standard F valve to J Valve over the last few days with an APY engine code. (Let it be known that I was told not to but when your as green as grass you like to try all the options what everybody else has already tried but dont listen to what people say lol, a bit like my 18 year old son lol) I fitted it the wrong way round to start with and hit limp mode 2wice in half an hour and then fitted it right way round and everything was hunky dory could notice a real change but then the sh@t hit the fan and hopefully i dont have big problems I will start a thread 2morrow to find out
Click to expand...
tar mate hope all goes well for ya i hit limp mode at 20psi with the standered f valve on my amk so god nose what it would be like with the j valve
 
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