[Diy_efi] "Wet" Manifold Questions

[Tom Sharpe]

IMHO, the problem is the 10-10.5:1 CR. Drop it to 8.5 and turn up the 
boost. Intercoolers really work then. For endurance applications, find the 
largest intercooler you can fit. 
Turbos tend to have an rpm range, from X to 2-2.2X. For example 3000 to 
6000-6500 rpm. This can be tweaked w/ waste gates. Positive displacement 
blowers tend to produce the same boost at all RPMs. Guage boost tends to 
rise as internal restrictions increase (VE decrease). 
8000 rpm high boost turbo motors tend to have really soggy low rpm 
performance from the big cam which aggrivates the lack of boost. 
Build a 2.5L 8.5cr 6000 rpm turbo motor w/15 lbs boost, water inj, and 300 
hp on 89 octane.  

 
On Wed, 15 May 2002 14:13:33 -0400, Stephen Andersen <SAndersen at advan-
tek.com> wrote :

> The supercharger is an Opcon/Autorotor compressor.
> 
> Where is info that indicates that the compressor is before
> the TB?
> 
> I am aware that it "CAN" work, however I would consider the 
> extreme noise of this setup to be unacceptable.  At the end 
> of the day, having the TB at the inlet to the compressor 
> is actually making packaging easier for me.
> 
> As for intercooling being a waste of time for low boost, I would and will
> wholeheartedly disagree with you.  On an engine that runs 10-10.5:1
> compression,
> I don't want to run without an intercooler.  The centrifugal kits,
> which use compressors that have 70-75% efficiency (vs a max of 
> about 65% for the twin-screw, 80% is pure BS), have significant
> heat soak problems on hot days or on the road-race track
> due to the added heat.  I am not willing to accept that, and it 
> should not be an issue in a "properly engineered" kit.
> 
> Intercooling, or at least the option to use it (I may want to develop
> a cheaper non-intercooled kit eventually), is non-negotiable to me...
> 
> Steve
> 
> > -----Original Message-----
> > From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On
> > Behalf Of Eric Fahlgren
> > Sent: Wednesday, May 15, 2002 11:50 AM
> > To: Diy_efi at diy-efi.org
> > Subject: Re: [Diy_efi] "Wet" Manifold Questions
> > 
> > 
> > justin ivan wrote:
> > > 
> > > http://www.bahnbrenner.com/
> > > Here is a commercial application of a lyshom twin screw on 
> > a VW engine. It
> > > most certainly has the TB after the compressor. Makes nice 
> > power but very
> > > noisy.
> > 
> > Anyone know who makes this particular supercharger?  The BahnBrenner
> > page just says "Swedish manufacturer," does that mean it's a Whipple?
> > 
> > -- 
> > Eric Fahlgren                                        MSC.Software
> > Stimulating Reality                      Ann Arbor, Michigan, USA
> > 
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> > 
> 
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