DSKREET

Long story short.
My S trim is no more and will be running a Si trim. LS7 stock bottom.
Car made little over 700 on the S trim with a 3.6 pulley @7psi on 93oct with *14 of timing, blower cam and heads. How much more boost will a Si trim add ?
I've read the specs sheet on both units just looking for some real world info

Thanks Jesse

Slo-Poc

I don't think there is a difference?.. One is oil feed and other self contained.

DSKREET

S trim 50,000 RPM 20 psi max 1000 cfm 680hp 72% efficiency rng
Si trim 52,000 RPM 22 psi max 1150 cfm 775hp 78% effciency rng

V2 oil fed
V3 self contained

Streetk14

I don't think you'll find many guys with much S-trim experience. The Si has been standard for a long time.

tlove32

On my old Mustang, I went from an S to an Si and gained 17rwhp with the same pulley combo. The Si has a better step-up ratio, and is more efficient than the S Trim