1) Compression ratio (volumetric effeciency). In a CSP Miata you are limited
to 10:1 by using the 2001 motor. In DP I can go as high as I dare.
2) Cam profiles or TB. Many stock motors are limited in the air they can
breath by the cam profiles or the TB size (valve size are restricted to OEW for
most P cars) A SP trim 2001 Miata engine is limited to about 150 rwhp even with
an open intake because the cam is the bottle neck. In DP trim I could go
upwards of 180 rwhp since the cam is not the bottle neck but the 55mm TB is,
the stock 55mm TB can flow nearly 300 cfm which is a lot of air.
3) Gears. I can run run any gears in the tranny and rear.
Blanket statements are tough to make for comparing SP and P cars. Depends on
the car.
Randy
>
> It's not immediately obvious to me that Prepared motors are inherently
> faster than Street Prepared motors.
>
> In SP, you have free intake, exhaust, and ignition with stock internals.
> So you are limited by the amount of air that can flow through the heads.
>
> In Prepared, you have fairly restrictive intake with fairly free internals.
> So you are limited by the amount of air that can flow through the intake
> system.
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