[urq] speaking of 28psi

[Ben Swann]

Mike,

No problem with your setup - the internals should be good for at least 500HP AFAIK with
those rods.  The turbo will be a limitation, but not for 3 Bar.  How long can one stay
at 3 bar anyway - that is pretty d at mn fast!

Just add WBO2 so you can keep an eye on things - that is datalogging preferred.

Ben

[Date: Tue, 18 May 2010 06:44:15 -0700
From: "Mike Sylvester" <mike at urq20v.com>
Subject: Re: [urq] speaking of 28psi
To: "Ingo Rautenberg" <ingo.rautenberg at gmail.com>
Cc: urq at audifans.com

This is the hardware:

RS2 turbo
RS2 exhaust manifold (extrude honed)
Head is extrude honed.
RS2 exhaust cam
RS2 injectors
RS2 MAF
Pauter rods
Adjustable fuel pressure regulator
New distributor with metal gear and correct small tip rotor
Porsche 951 intercooler

The 28psi is not a spike. I haven't stayed there long, but I think it
will hold there.  Mike www.urq20v.com]

> _____________________________________________ 
> From: 	Ben Swann [mailto:benswann at verizon.net] 
> Sent:	Tuesday, May 18, 2010 10:52 AM
> To:	'mike at urq20v.com'
> Cc:	'urq at audifans.com'
> Subject:	[urq] speaking of 28psi
> 
> Mike,
> 
> No major problem with 3 Bar.  I am running the GTQ 3 Bar chipset in my avant and have
> several other folks running the same or even more boost - VMAP is adjustable to 4 Bar
> and tweaks can be made for fueling - details provided with the chipset.
> 
> That said here are some caveats:
> 
> 1. I don't recommend pushing a stock engine with 3 Bar chipset.  You are ok with
> occasional bursts and the 3 Bar chipset allows one to get 2.5 bar more consistantly.
> Also, the k24 just does not cut it, and one should lose the K24 even when going to 2.5
> bar.   I am presently running some turbo equivalent of Pratt and Whitney fanjet-
> What a sleeper!
> 
> 2.  Hoses, fitting, seals start to be subject to higher pressures.  At 2.5 bar, my
> experience is you will find a bunch of marginal hoses blowing off.  At 3 bar you will
> go through the weak spots again, and I found the Samcos don't cut it - too slippery
> and slip off the intercooler or turbo.  I had to make my own custom hoses - cheaper
> and better in the end.
> 
> 3. Ignition is OK as long as you maintain everything correctly and use the recommended
> plugs or NKG substitutes.  Ignition problems will show up at higher boost levels.
> Definitely make sure you are using the narrow tipped rotor and that there is no timing
> belt slop and that the Hall is set dead middle of window.   I had a miss that came
> about because the extra boost was blowing oil into the plug wells through the original
> cam cover gasket - that needs replacement, but for now I just clean out the oil every
> so often.
> 
> 4.  If you need 3bar sustained, the stock internals probably won't last too long.  
> 
> 5.  You need to watch fueling.  You will need to go with larger injectors - 38, 42, on
> up depending upon how much boost and how fuel pressure is set.  I recommend tuning
> with WBO2 and adjustable fuel pressure regulator.
> 
> So that is it - 3 bar is fine with stock motor as long as you don't push it. 
> 
> Ben
> www.gtquattro.com
> 
> [Date: Mon, 17 May 2010 16:51:21 -0700
> From: "Mike Sylvester" <mike at urq20v.com>
> Subject: [urq] speaking of 28psi
> To: "urq Audifans" <urq at audifans.com>
> Message-ID:
> 	
> <20100517165121.195365548da1c44eaf4974b0054c21d8.b96de415cd.wbe at email.secureserver.net
> >
> 	
> Content-Type: text/plain; charset="utf-8"
> 
> Can you safely run 28psi on a 3B?
> Is anyone doing it and keeping the distributor?
> 
> I'm curious why MTM would make a 3B chipset that will boost to 28psi.
> 
> Mike
> 
> www.urq20v.com]