[s-cars] wastegate adjustment questions

[Rokas Reipa]

I actually think that's what's happening. The turbo reaches the maximum
boost a little too soon and then backs it off eventually. In fact, I am
getting only 15-16psi in 5th gear at WOT. The maximum boost rush just comes
on a little too soon and then if I dig deeper into the throttle, it seems as
if it doesn't know what to do because it's moving all the air it can
already. I will back it off 90 degrees or so and try it again. I do know
that the way it was before wasn't completely correct as the car felt aloof
and sluggish at times. Is an ECU reset required after every adjustment or is
that not necessary? Thanks,

Rokas
95.5 S6

> You should find that if you have the spring wound in too tight, you will,
> a) overspeed the K24.
> b) remove some or all of the computers ability to modulate the boost with
> respect to engine operating parameters.
> c) find a very snappy crisp tip in, but it will run out of breath and not
> have any further build up of power sooner.
> d) in extreme cases cause the computer to go into limp home mode due to
the
> overboost condition.
>
> Don't as me how I know, that much I am sure is obvious :)
> I HAD TAP Stg 3 software and was told by Igor to unwind the wastegate
spring
> so it was only 2 1/2 turns from just engaging the spring tension. If it
was
> wound too tight even by 1/2 a turn, I would have to reboot the ECU, and at
> so point back off the spring and then RESET the ECU. Got so bad that I put
a
> button on the dash to reset the memory.
>
> Mark S
> ----- Original Message -----
> From: "Rokas Reipa" <rokas at wam.umd.edu>
> To: <s-car-list at audifans.com>
> Sent: Thursday, October 23, 2003 4:04 PM
> Subject: [s-cars] wastegate adjustment questions
>
>
> > Hey everyone. Wasn't happy with my car's performance lately; it seemed
out
> > of tune and not as fast as it should be. Decided to try adjusting the
> > wastegate last night as well as replace the o2 sensor. Turned the screw
> 360
> > degrees clockwise and went out for a test drive. Wow. Car has been
totally
> > transformed, from merely quick and sometimes lethargic to a proverbial
> > screamer. Turbo spools up MUCH sooner and quicker now. It is especially
> > ridiculous on the highway, where 1.5 inches of gas pedal travel produces
a
> > tremendous rush of acceleration. In third gear, I saw a maximum of
~21lbs
> of
> > boost; I could only muster about 16 before. While I am enjoying this to
> the
> > utmost, the prospect of turbo or other component damage really worries
me.
> > The car has a Stage 1 TAP chip in it and an adjustable wastegate, stock
> K24,
> > nothing else. Did I turn it too far? Should I turn the wastegate back a
> bit?
> > What is the optimal setting for these things? The change is amazing and
> > addicting but at the same time I keep worrying...Thanks,
> >
> > Rokas
> > 95.5 S6
> >
> >
> >
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> > http://www.audifans.com/mailman/listinfo/s-car-list
>
>