wastegate mod

[Ameer Antar]

The wastegate mod will make a noticeable difference, but you're probably 
staying under 1.6 bar which actually a decent amount. Especially on a ur-q 
the added boost might give you 20 extra hp.

One thing about the ECU's is they start retarding timing quite a bit beyond 
a certain boost level. I don't know what boost level that occurs, but 
retarded timing is hard on exhaust/turbo. Also I think some ECU's try to 
set boost to the preset 1.4 bar when the WOT switch is on, so it could 
reduce the boost under that condition, unless the ECU is showing lower boost.

just curious, what is your max. boost levels on the gauge now?

-ameer


At 11:27 PM 11/23/2000 , you wrote:
>I have read the posts about it not helping without the ECU mod as well. I'm
>no expert, but my car has not hit the FP cut off. It may be that my car
>wasn't up to stock levels to begin with, but I don't think so.
>The mod to the cap is merely drilling out the plug on the top of the cap.
>Under the plug was an allen screw that holds the spring perch. That screw is
>locked in very tight, and the cap is threaded to allow adjustment once the
>screw is freed up. I had to use a mill vise with plastic jaws to break loose
>the screw. The bolt is used only to lock the stock screw in place, now that
>the locktite has been eliminated.
>My understanding is that the stiffer (more pressure) the spring, the longer
>the wastegate stays closed, building boost faster.
>The only gauge/meter I used was a Duty Cycle meter. It allows you to set the
>mixture, which if correct will give a DC reading (at idle) of around 50%. I
>did some trial and error (seat of the pants) empirical adjusting to balance
>between WOT and low end partial throttle response, and have not yet hit the
>dreaded FP cutoff.
>I have no idea how much more power I might have, but the biggest gain was
>that the car now has useable power in the 2-3k RPM range. It is _much_ better
>in traffic, and the boost gauge does show more boost on WOT. It would get a
>little anemic at +5k before, but now pulls much better to redline. My guess,
>since the gauge is notoriously inaccurate, is about 1.6 bar.
>I'm sending this to the list also as to avail us of any necessary
>corrections, or other added details.
>It may be said it's not worth it, but it made big difference on my car.
>Feel free to ask for more details if anything is unclear.
>
>Dennis