SWR

is that it's in perfect shape. I took it completely off and inspected it as thoroughly as humanly possible, and I couldn't see any possible tears in it at all. This is what I would expect since we did an AWE pressure test and couldn't detect any leaks.

So back to my weird spec'd boost vs. actual...anything else could be causing this? Should I just send the ECU back to Hoppen and demand a reflash and hope that corrects it?

Honestly, I'm disappointed that none of the AW experts can diagnose my (in my opinion) straightforward, and surely seen before, problem.

Previous posts are still there if anyone else can offer any other suggestions beyond the typical "boost leak" opinions. I don't mean to offend at all, just thought I'd get a lot more help than this. Can a poor ol' S4 buddy get a break?

DYOS4

havent read all of your posts, have you tried running stock? or another chip?

JasonS4+Festicle

only asking because both tears I had were under the clamp that connect the TBB to the throttle body....

Did you take off your BPV and apply vacuum to them to see if they held vacuum?

SWR

the spec'd boost hit around .7 bar and actual hit around .65, and the differential was VERY close as opposed to when running the MTM chip which was always 15-20% difference. Ideas?

SWR

I inspected the inside of the TBB and pulled back the TBB rubber underneath the clamps (all around each clamp) to see if there were any tears. Was that sufficient, and should I try again and take off the clamps completely? How noticeable was your tear, and where was it exactly? Thanks!

DYOS4

Tears are right under the clamp. Squeezed tightly by the clamp.

SWR

And shown by looking directly, or must one "squeeze" the TBB? Sorry for the ignorance.

JasonS4+Festicle

under the clamps all the way around to inspect it properly...

My first tear was huge (~2 inches) and only could be seen when the clamps were off completely)....

My second tear was only ~1/2" - there was NO WAY to see it without the clamps off completely...

Oh, also, both of my problems happened only in chipped mode (was running APR at the time) - when stock boost levels were present, there was not enough pressure to notice a problem - double the boost pressure and there was a problem.

You also need to take off the BPV and apply vacuum to the nipple to make sure they hold -

Not trying to be a pain, but the first 2 things to look for when experiencing symptoms like your would be the BPV and the TBB, both must be inspected....

The likelihood you have a "bad chip" would be pretty low in my opinion....they simply flash a program onto a chip - hard to believe it would be bad...there are lots of problems that can be unmasked when you double the boost!

SWR

Thanks, Jason. Since my 710Ns are brand new, I'll try inspecting the TBB again with clamps off.

AxelS4

sounds like the N249 with a spurious malfunction - that is what it was on my car.