Car wants to 'go' when lifting gas pedal, ignition timing??

**B5Burn** · 10-01-2008 08:44 PM

Anyone experience this before? I don't mean the car accelerates more than when I had the pedal down, but after I go hard in say 4th or 5th and slowly lift the pedal - the car feels like it wants to 'go'.... I think this is an ignition timing thing that I need to adjust... so hard to describe, but the last time I experienced it, I think it meant turning a distributor cap.

Ideas?

B.

**Poopie** · 10-01-2008 09:03 PM

surging?

**B5Burn** · 10-01-2008 09:17 PM

You could call it that... what is happening? is it my accumulated boost running off or something? I feel like something is operating out of range and needs a tweak.. ? Last motor I ever 'tuned' (adjusted) was carbeurated... ?

There are no issues with revs or anything... and AFR is pretty solid, just feels like I am wandering past some power range that the car really likes...

Thanks,
B.

**Poopie** · 10-01-2008 09:35 PM

no clue....would you say it happens at part throttle? what turbo do you have? 3071r? what wastegate?

**B5Burn** · 10-01-2008 09:42 PM

I mostly notice when letting off after higher rpm revving.... I 'think' the timing advance is at play here...

GT2876, .86 ar, Turbonetics Deltagate wastegate.... oddly, I have recently come across a cpl DV mentions relating to surging... but under throttle... and I have had suspicions of low boost relating to the DV... going to swap it for the Forge 007 on my GLI and see what happens....

I could swear this is a timing thing though...

**Poopie** · 10-01-2008 10:16 PM

perhaps the spring is worn and leaking boost cause you don't have enough pressure to keep it closed? i dunno. try the new dv and check to see if its working right.

**j2da** · 10-02-2008 09:23 AM

how much harder does it pull? this happens to me too, although im not bt...but from what i can remember, when you lift the pedal a little bit it causes you to run a bit lean. this will cause you to pull a bit harder. worth a shot tho, go WOT and lift a tiny bit and check to see if its running leaner.

**Poopie** · 10-02-2008 09:41 AM

i think the s4 guys have seen something similar. they said only going 75% wot got them faster times on the track.

**maxspeed** · 10-02-2008 09:50 AM

Originally Posted by Poopie

i think the s4 guys have seen something similar. they said only going 75% wot got them faster times on the track.

this was the case my fathers 01 TT, 75 - 80% throttle was faster than WOT, and like poopie said, full boost + less fuel = leaner..

**Sigma 3** · 10-02-2008 10:13 AM

Originally Posted by maxspeed

this was the case my fathers 01 TT, 75 - 80% throttle was faster than WOT, and like poopie said, full boost + less fuel = leaner..

Thats the case with my supercharged a4. It accerates much faster at 80 % throttle

**AudiA4_20T** · 10-02-2008 10:57 AM

my b5 used to do this

**T3hD0gg** · 10-02-2008 12:32 PM

Originally Posted by j2da

from what i can remember, when you lift the pedal a little bit it causes you to run a bit lean. this will cause you to pull a bit harder. worth a shot tho, go WOT and lift a tiny bit and check to see if its running leaner.

That wouldn't make sense as the throttle body should close when you let off the throttle which will cause it to run rich.

Edit: Ah, I didn't read you correctly. You said when you let off a little bit.

I actually have the same exact problem. I've been fiddling with stuff on my car to figure out the problem. I think it has to do with the software and N75 valve that is used. For some reason they don't cooperate too well. When I throw in my stock ECU, it fixes all the problems that are described in this thread.

What software are you guy using and are you using a different N75 valve than stock?

**B5Burn** · 10-02-2008 01:00 PM

I am using piggyback fuel management, with an EBC. As you may have read, I have been suspecting my DV, which I am going to swap for a known working Forge on the week end... but I HAVE also been suspecting my EBC, it needs an upgrade badly.

B.

**T3hD0gg** · 10-02-2008 01:08 PM

I changed my DV from the 710N that was on there to a brand new one I ordered from ECS Tuning and the car seemed to hold boost a bit better but it didn't fix the problem.