[s-cars] more boost with rs2 turbo

[Sean Douglas]

Depending on the software, I've seen 2.6 to 2.9 bar absolute. I found
the higher boost software too aggressive and it allowed too much timing
advance, causing detonation even with 94 octane (RON+MON/2). I switched
to a different chipset which allows 2.6 bar and the engine does not
detonate.

Its quite possible that the spring is stiffer on the RS2, the part
numbers for the wastegate are different, 034 145 705E (RS2) and 034 145
705B (AAN).

Sean Douglas
1997 Audi S6//RS2-spec
1990 Audi 90 quattro 20v


> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of krists at livas.lv
> Sent: Tuesday, October 18, 2005 12:14 PM
> To: s-car-list at audifans.com
> Subject: Re: [s-cars] more boost with rs2 turbo
> 
> 
> Hello Robert,
> 
> I've done the WG screw mod and have experimented with this 
> but when I had the Motronic setup, I remember, that scroll 
> down the screw with the max. possible turns got me +0.1BAR of 
> boost - and that was with the original chipsets (so - 2.3 
> overboost). With the MBC , it was 2.5BAR max.
> 
> The question was, what AAN rs2'ed guys do for having 2.8BAR 
> absolute(1.8 relative turbo boost )? Does the software and 
> 3BAR MAP sensor change (not to mention all the other rs2 
> bits) will give one these boost numbers? I've heard that real 
> Audi RS2 WG spring is stiffer than found in ABY/AAN setups.
> 
> 
> Original Message:
> -----------------
> From: Robert Myers robert at s-cars.org
> Date: Tue, 18 Oct 2005 10:13:37 -0400
> To: krists at livas.lv
> Subject: Re: [s-cars] more boost with rs2 turbo
> 
> 
> 
> Hi Krists,
> 
> Stiffening the WG spring might help.  Drill a small hole dead 
> center in the 
> plug in the center of the WG cap and use a sharp object (a 
> nail perhaps) to 
> pop the plug out.  Discard it.  The plug is < 1 mm thick so don't go 
> drilling for oil ;-).  Now use a 5(?) mm Allen wrench to 
> screw the newly 
> exposed screw into the WG.  Some are lock-tighted in place 
> and may require 
> heat from a propane torch to soften the stuff enough to screw 
> the bolt 
> in.  Keep track of how many turns you use so you can put it 
> back later if 
> you want to.  Optimal for my car turned out to be about 4 
> turns.  Others 
> report anywhere from 3 to 6 turns as optimal for their cars.
> 
> 
> At 10:05 AM 10/18/2005, you wrote:
> 
> >Hello!
> >The problem is that I'm seeing aprox 1.5 turbo boost pressure (2.5
> >absolute) all the way to 5500rpm and I can't get it to 1.8BAR. How 
> >could I resolve the problem and what's the limiting factor 
> of boosting 
> >max to 1.5BAR? - can one get 1.8BAR with the standart WG 
> spring. Do I 
> >need the stiffer WG spring (one from 034efi that says 1.9Bar 
> max boost) 
> >or should I fit a MBC between the WGFV and WG and keep the stock WG 
> >spring? P.S. I have a 3BAR MAP so no worries about how the ECU could 
> >stick with these boost levels Silver Euro S4 91'
> >
> >
> >
> >
> >
> >
> >Megasquirt ECU (3 BAR MAP, custom COP ignition setup, mega squirt'n 
> >sparks -extra firmware) rs2 turbo
> >rs2 ex.mani
> >48lb/h injectors running at 4BAR
> >Bosch racing fuel pump
> >710N BPV
> >custom exhaust system
> >MB CLK /Typ 208/ 315mm front brakes
> >Audi A6 2000 avantgarde 17"x8.5
> >Michelin pilot sport 255x40
> >Audi TT shifter
> >
> >
> >
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