[s-cars] Could it be the GP RS2 turbos are "over" spec?

[Lewis, Gary M]

Dave,

The PSI output (and not VOLUME, which is a function of temp also) of the turbo in our cars is generally a function of the controls on the wastegate, which in itself is controlled by the ECU (I say more or less, would like someone to make a top WGFV, ECU controlled please).

If you slapped a K27 on your car, you'd see more or less the same psi, of course at differernt rpm levels, but much more volume.  

Are you running Pastore software?  I get to 28-29 psi in 5th gear anytime I want, at 2.9 bar setting, no pinging, 91 octane.  I do have a bigger turbo than you however (bigger = cooler charge at same psi = more volume. Generally...)  What worries me more is the pinging.  What it says is that there is something wrong somewhere in the system (electrical, fuel delivery, etc.) , with the gasoline, or the turbo is just being asked to put out too much HOT air, but I find the last hard to believe.

Gary Lewis

1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2 Exhaust Manifold, RS2 Injectors, Custom Turbo (K26 Turbine, Factory K26 Cold side (Audi Works '999' P/N) with 50mm intake and custom Innovative Turbo compressor wheel), TurboXS Type 25 Bypass Valve, Bilsteins, Eibachs, Big Reds, Spec II Clutch.


-----Original Message-----
From: Dave Forgie [mailto:forgied at direct.ca] 
Sent: Wednesday, June 30, 2004 10:01 PM
To: s-cars
Subject: [s-cars] Could it be the GP RS2 turbos are "over" spec?


I am starting to wonder whether the recent new batch of RS2 turbos from the TJM Motorsport GP (no reflection on them) are, in fact, putting out more pressure and/or flow than the originals.  I say this because I was seeing 28 psi on peak boost and was getting pinging until I turned my VMAP down to 2.8 Bar.  Now I "only" see 24 psi and get but a little pinging. I am going to be checking my fuel supply system but I am wondering if these new turbos are actually over spec with respect to flow and pressure.  Any others with the same thoughts?

Dave F.

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