Audii R8, was Re: Lowering Compression?

[bbeacock@rogers.com (Ben Beacock)]

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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