[s-cars] Help chipping a virgin

[Tom Green]

Brian,  All this time and effort expended and nary a mention of DTCs.  Hard to 
believe you have been through 20 years without making an acquaintance of the
first step to be taken with troubleshooting any problem.  

VCDS with VAG-COM software is the most friendly method, but you can also 
blink the codes on the MIL.  See Scott Mockery’s information at sjmautotechnik.com <http://sjmautotechnik.com/>.

As noted by others, you need to find that hiss, that is most likely a boost leak.  Your 
post would lead me to believe a hose clamp has been overtightened and crimped the 
hose bib.  It is common for new silicone hose installations to slip off the bibs at the 
MM hose, but that usually results in a massive boost leak at WOT and a fuel cut
with the violent bucking known as the brick wall.

Tom

> On Oct 12, 2015, at 9:49 PM,Brian Pleet <subscriptions at strategico.ca> wrote:
> 
> After 20 years with my 95.5 URS6 , I finally bought the Intended
> Acceleration basic chip set in preparation for the Audi Sonoma track event
> this coming weekend. Too late, it seems because although it feels overall
> much quicker, when I go to the floor, it hesitated and hisses from under
> the hood until I release the pedal.
> 
> So far, I replaced the 20 year old blow-off valve, no change. Then I ran it
> with a stock ECU, no change. Then I ran with a used (unknown) Wastegate
> Frequency Valve and it ran fine with no boost, stable enough to get home
> from Seattle. Then I replaced the WGFV with a OE unit and the problem has
> returned. I opened the wastegate cover but no obvious issues, diaphram was
> perfect. Today, I swapped the mass air sensor and the hesitation went away,
> but the hiss continues and under extreme acceration, the oomf is absent
> until it gets above 4000RPM. More fun to drive, but not perfect for the
> track.
> 
> Historically, and maybe related; the fuel pump failed last month so I
> replaced it with on OE unit. I've taken the throttle body off a few months
> ago to replace the hoses and seals underneath, but it was reassembled and
> working fine. I installed a set of 034 silicone hoses.  I replaced the
> noisy blower motor without removing the heater box. I replaced the one
> still original POS with a new one.
> 
> She's not taking the loss of virginity well. My tech advisor suggests the
> hiss is exhaust trying to get through clogged 20 year old  catalytic
> converters. Any other ideas welcome, or I'll see you in Sonoma.
> 
> 
> 
> Brian
> 90 90Q 20v
> 95.5 S6
> 06 TT Roadster
> Vancouver BC