Boost

[Jay Kempf]

Strange,

Have you gone the reverse route and tried re-installing your modded ecu 
in another known good car of similar boost level to see if it does it on 
a different car? I did that when I suspected a bad ECU a while back in 
the end proving that my ECU was fine and it was something else. Took a 
while to coordinate up here in the middle of nowhere with another guy an 
hour away.

Seems like you have done all the things necessary to eliminate bad 
input, output and boost leaks that could throw the computer into some 
sort of limp home. Seems also if your N75 checks out it should just 
work. Haven't heard of much in the way of nuance with that device.

I'm still pinning for an oscilloscope after my recent diag death spiral. 
Even the little DIY ones would be better than nothing. If you could tie 
in and watch the knock sensor output that might somehow tell you your 
timing was being pulled back near the stop if that is what it is. Seems 
like that would be the most obvious choice. These older ECUs are a bit 
limited in what they can tell you about what's wrong. Unlike the ODB2 
stuff where you sometimes get 10 misleading codes for one bad ground.

I'm feeling your frustration and wish I could help more. I keep telling 
myself I am not going to get emotionally attached to any more vehicles. 
The newish A5 6sp daily driver is really nice but I can just get another 
one when I wring the current one out. Some how this Avant has decided it 
wants to be a dependent child of mine and yet I don't get any itemized 
deduction.

regards,

jfk

802 272 5868


On 5/20/2017 3:00 PM, 200q20v-request at audifans.com wrote:
>
> Today's Topics:
>
>     1. Boost drop details, help! Long! (Eric Huppert)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 19 May 2017 18:05:52 -0400
> From: "Eric Huppert" <ehuppert at hvc.rr.com>
> To: <200q20v at audifans.com>
> Subject: Boost drop details, help! Long!
> Message-ID: <1B1C425297F141A0908AA05C2ED10F60 at homedesktop>
> Content-Type: text/plain;	charset="us-ascii"
>
> 'm struggling with boost drop after a couple of hard pulls. This ECU in
> previous 20v pulled to 21 lbs. Now in this 20v pulls to 21 first couple of
> hits, then drops to 15lbs . Shut car off, restart, back to 21lbs for a
> couple of hits again?
>
> Decided to look through my stash of N75's and see exactly what I have before
> pulling current valve out.
>
> Valve I pulled from my last DD, now parts car turns out to be a h model
> (AAN). And, like the other two valves I have out, all three have 300ish ohms
> vs. the 28-30 they're supposed to have. (one in the now DD, glacier blue is
> 28 ohms and clicks on the output test)
>