Forced induction on a 2.5 Liter 4 cylinder.

[Frank F Parker]

> David,
> 
> I don't know if this info will be helpful or relevant to you, but I did want
> to make you aware that there are other types of superchargers than the
> Rootes blower design that may have characteristics more in keeping with your
> objective.
> 
> I'm not an engineer, and I drive a Miata. I supercharged it last August with
> a Whipple  Autorotor Lysholm compressor. The engine is a MAP multiport EFI,
> and the pulley that came with the SC gives me up to 8 psi of boost. My 1.6L
> engine is 117 bhp stock. Haven't done any testing, but I'm quite sure I have
> 50+ more horses. If you don't want that much horsepower, you can install a
> bigger pulley, or just don't mash the accelerator as hard. The response is
> instantaneous, and very smooth; you can drive it normally with no boost, or
> more aggressively with any amount of boost, and the boost comes in at very
> low rpms. 
> 
> The system has no bypass at all other than the idle air bypass whose inlet
> was relocated during installation. As for being complicated, I installed it
> myself over a weekend. The "kit" was from Bell Engineering Group, Inc (BEGI)
> of San Antonio,  TX, and it came with intercooler, custom tubing, assorted
> castings for remounting and relocating throttle body and airflow meter, a
> boost-controlled fuel pressure regulator, a piggy-back high pressure fuel
> pump, and an MSD ignition retarder which I have since replaced with a J&S
> knock sensor so I can run whatever octane and timing settings I want. Price
> of the kit was about $2500 at the time, and depending on your enginuity
> (sp?) in making things fit together, you could probably obtain the same
> components and put it together for considerably less. 
> 
> This is Miata-specific, but BEGI's web site has some interesting info about
> their induction kits.
> The address is http://www.tristero.com/sa/business/bell/index.html.
> 
> 
> Doug Gubbins
> Apogee Systems, L&H Technologies
> Charlotte NC
> 
> "There's always another bug..."
> 
The Whipple unit as sold by Keanne-Bell and Bell Engineering is the best
supercharger. Gets boost lower and uses less HP. Tests done @ Ford show
that Eaton, Paxton etc for 8psi on 4.6L motor used 70 hp to make boost
while the Whipple used 35hp. Bell's kits are very well thought out.

Frank Parker
93 Civic EX vtec custom turbo
89 S-10, 5.7L v-8 with DFI/TFS etc
>