[s-cars] Rear-mounted Squires Turbo System - good for S-cars?

[Joe Pizzimenti]

Daves: Comments inserted:


On Sun, 09 Jan 2005 09:35:40 -0800, Dave Forgie <forgied at direct.ca> wrote:
> Sam and Dave (McBride) installed one of those "wierd" rear-mounted turbo
> systems on a 350 Camaro on today's TwoGuysGarage (on Speed Channel).
> They tested it on a Mustang eddie current (2 wheel) dyno and it took the
> HP from 269 to 405 and added 140 ft-lbs (or so) of torque - all on the
> stock engine management and fuel systems.   And  this with only 5 psi
> boost (hmmm....).  There is also a kit for methanol injection which
> permits a bit more boost (7 psi instead of 5 psi).  I wonder (out loud)
> a) why this seems to work so well with only a bit of boost and b)
> whether it would have any application to an S-car.
> 
Look at the compression ratios of the 2 motors.  The Audi lies at
around 9.3:1 while the V8 cranks around 11:1.  Higher compression
ratio=higher cylinder pressure=less boost required to make more
horsepower.

Methanol injection works very well on any forced induction car.  See
derekdevises.net, supraforums, evolutionm.net, google, or just ask
myself, Uncle Bob or Canadianese Mark S how much fun it is when intake
temperatures are lower, especially on a car with inefficient charge
air cooling.  Hell, in the dead of winter on a car with a HUGE front
mounted intercooler (See Pizzo Rice Rocket), you can feel a difference
and the car will take a few degrees more timing and a bit leaner AFR
without detonation to chit.

As for the rear mounted application and bastardizing an S car with it,
consider that on a V8, you either need 2 turbochargers mounted on the
sides, or one at the collector for both.  Considering size restraints,
looks like they went rear mounted.  Unfortunately, this introduces
more plumbing (read:laggy) and probably isn't worth it on an inline 5.

As for specific output, see 120HP/L in the Honda S2000.  While good
for bragging and internet prick waving, I think the torque of a V8
will take it every time.

As for making big horsepower/L with a V8, see a 6 second 1/4 mile,
2000 horsepower V8

http://www.gmhightechperformance.com/features/0411htp_charged/

Granted, that's a 410ci with a short stroke.  Happersized, indeed.