Audi R8, was Re: Lowering Compression?

[jdbubb@ix.netcom.com (Dan Bubb)]

Well, I went back and checked the article and there it is.
Although I've always been a big fan of Car & Driver, I think they really
dropped the ball on those numbers.
A 2.0L turbo 4 in LMP675 is limited to 21.5 psi and makes a little over
500 HP. If the Audi was being boosted to over 20 psi the 6 L Panoz and
the 4 L NA Judd engines would have ZERO chance.
Basically, I trust Racecar Engineering and Racetech more than Car &
Driver.
Dan


----- Original Message ----- 
From: Ben Beacock <bennyb2k4@sympatico.ca>
To: Scirocco. org Mailing List <scirocco-l@scirocco.org>
Sent: Sunday, September 08, 2002 1:24 PM
Subject: RE: Audii R8, was Re: Lowering Compression?


> It was an article I was reading in Car and Driver.  They had cool
> interval photos of them removing the back end in 90 seconds.  If only I
> could change mine that fast, I'd put an FF in every time I needed to
> make a hwy trip. :)
> 
> Ben
> 81 Scirocco 2L16V EFI
> 81 Caddy
> 91 Passat GL
> 
> -----Original Message-----
> From: scirocco-l-admin@scirocco.org
> [mailto:scirocco-l-admin@scirocco.org] On Behalf Of Dan Bubb
> Sent: September 8, 2002 7:09 AM
> To: bbeacock@rogers.com; Scirocco. org Mailing List
> Subject: Audii R8, was Re: Lowering Compression?
> 
> Simple.....
> It doesn't.
> Based on information from Racecar Engineering and Racetech LMP boost is
> limited to a much lower value.
> I could only find data on the 4.0 L TT Cadillac LMP, but it is limited
> to
> 7.5 psi boost. The 3.6 L TT R8 may be allowed a slightly higher boost,
> but
> it's going to be in the region of 8.5 psi.
> OTOH, CR is revealed to be >12:1. This the DFI engine. The previous R8
> engine ran >11:1.
> What is truly amazing is that this engine also is expected to run in the
> region of 1.2-1.5 lambda! That's an A/F ratio of up to 22:1. No data on
> what
> conditions it runs this high.
> Also, there was no information on any special coating, although there
> was a
> lot of attention to combustion chamber cooling to improve piston life
> when
> they went to the DFI engine.
> Tuning, cooling, race gas, DFI....they all contribute.
> So, where'd you get your data on boost and CR??
> Dan
> 
> ----- Original Message -----
> From: Ben Beacock <bennyb2k4@sympatico.ca>
> To: Scirocco. org Mailing List <scirocco-l@scirocco.org>
> Sent: Saturday, September 07, 2002 12:01 PM
> Subject: RE: Lowering Compression?
> 
> 
> > Anyone know how the audi R8 can use 25 psi of boost on a 10.8:1
> > compression?  I imagine their tuning is dead on, but do they have some
> > funky coatings on the pistons/valves/head or something?
> >
> > Ben
> >
> > -----Original Message-----
> > From: scirocco-l-admin@scirocco.org
> > [mailto:scirocco-l-admin@scirocco.org] On Behalf Of Allyn
> > Sent: September 6, 2002 4:18 PM
> > To: Krazy Horse; scirocco-l@scirocco.org
> > Subject: Re: Lowering Compression?
> >
> > 1.8 can handle the stresses a bit better than a 2.0 can (in their
> > un-worked
> > forms). options for getting c/r down are forged pistons or head gasket
> > spacing.
> > other possibilities can come from funky head/block combos.
> > Al
> >
> > ----- Original Message -----
> > From: "Krazy Horse" <nightmare16v1988@hotmail.com>
> > To: <scirocco-l@scirocco.org>
> > Sent: Friday, September 06, 2002 12:05 PM
> > Subject: Lowering Compression?
> >
> >
> > > Whats the best way to lower compression in a 16v engine? Which would
> > be
> > > easier to set up for forced induction, 1.8L or 2.0L? I would like to
> > go with
> > > a 2L Turbo proj. in the future, however, if 1.8 is the way to go,
> then
> > 1.8
> > > is the way to go! TIA.
> > >
> > >
> > >
> > > -Craig
> > > "Nightmare" '88 16v (PG-T Proj.)
> > > "Calypso" '91 Golf GL (Daily Driver)
> > >
> > >
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