V8 conversions: Torsion bar size and rear spring rates?, What do you run? Options

[tygaboy]

Hi V8 folks -
I'm looking for recommendations to size my torsion bars and rear spring rates.

Component-wise, it's an LS3 with Boxster 6-speed. The total drive train weight is around 575 lbs.

I'm running Koni yellows (helper springs on the rear), 17mm raised front spindles and the 2" Tangerine rear suspension points and tall shock tower kit.

I'd like the ride to be sporty but tolerable. if that means anything! The use case is "spirited street driving" I'm not worried about ultimate track performance - at least not yet.

So, wha'cha running?
Thanks,
Chris

[Andyrew]

Your running a big bar up front.

You also have good free flowing bushings.

I would say 19mm T bars and 225lb springs. Dial the setup in with the front sway bar and enjoy.

You can easily back the 225lb springs down to 200 or 180 if you want, But my 225lb springs feel pretty compliant with my light 1.8t and I have only slightly better bushings than you (ball bearing bushing replacements, the ones Mueller made), I would expect they perform the same as the elephant in the real world. I know for a fact that this drops the effective spring rate down.

I would say its probably a similar ride firmness to your taildragger. Koni shocks help make it livable.



For full reference I run 22mm T bars up front, 225lb springs, koni yellows, ball bearing bushings, and no sways. I plan to finish up my nascar sway to plant the front a bit more, but it feels pretty good as is.