Fwd: Re: [BiturboS4] S4 without a turbo? (was.. something else)

California Fields cfields72 at hotmail.com
Mon Feb 3 14:54:35 EST 2003

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A Z-engineering (www.z-engineering.com[1]) supercharger for the VW GTI VR6
(which is a N/A engine with 10:1 compression) pushes 7 psi without any mods to
the engine and bumps horsepower from 174 to 270.  This company also makes kits
for Audis and Porsches so you can look more into it if you want.

If I recall correctly, the HPA (www.hpamotorsports.com[2]) turbo pushes 1.0bar
into the same engine for 310hp but the compression had to be dropped to 7.5:1
(or so they chose). I couldn't find exact info on their site.

So, unless a supercharger puts different kinds of boost into the engine, it
seems that you can run about 0.5bar into a N/A engine with *relatively* high
stock compression.  I'm not sure if 11:1 and 10:1 are considered enough
different to make a big deal. Above that, though, it seems you need to drop
the compression (and other stuff).
Carter Fields, San Francisco
2001.5, GIAC-X, Miltek 3" cat-back, Strat. shifter, Strat. DVs, A-pillar boost
>From: adamschwartz at rcn.com
>To: biturbos4 at audifans.com
>Subject: Fwd: Re: [BiturboS4] S4 without a turbo? (was.. something else)
>Date: Fri, 31 Jan 2003 15:02:01 -0500
> >I doubt it. 340hp out of a 4.2L V8 is a moderately high
>state of
> >naturally aspirated tune. It's got an 11.0:1 compression
>ratio which
> >is not exactly well-suited to turbo use. 12 pounds of boost
>on that
> >motor would be ping city.
>I would have to agree. You arent going to be able to get that
>kinda boost into an engine with that much compression
>already. BUT I seem to remember seeing a bolt on kit for the
>VW VR6... If I remember correctly it was really low boost.
>Something like 4psi. Sure, its not going to give you an extra
>150 HP, but it could in theory give you 50-75HP. Add in an
>exhaust.. and yes.. You should have an S4 with just over
>400HP. But I guess we need to convince the right people to
>build us this kit. APR? what do you think?
>BiturboS4 mailing list
>BiturboS4 at audifans.com

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  1. http://www.z-engineering.com
  2. http://www.hpamotorsports.com
  3. http://g.msn.com/8HMGENUS/2734

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