Talk torsions and springs. Options

[gnomefabtech]

Hello all-

So, I'm finally able to turn my attention to the suspension on my car now that it's running.

The car was hacked for a v8 when I got it and I have instead done my Hayabusa engine swap. I'll have to make a separate thread on the adaptor setup, but it's mounted north south and uses the original 901 trans. Dynos at about 300whp with turbo. 2k lbs overall weight. Narrow body.

The PO added some crazy stiff rear springs on coilover sleeves and they need to go. Also the front is way too stiff. It's all 911 front suspension and brake parts.

Questions:

I'm thinking about 140# springs in the back, but how long a spring should I use. 14"? 12"? Helper springs?

In the front I think it might have like 21mm bars, and that's way too stiff. Are normal 19mm 911 bars soft enough for a street driven 914? Or are there thinner 911 compatible bars?

Thanks!

[PlaysWithCars]

I've always preferred a softer spring set up, but have had to go pretty stiff on this car, similar to Aaron, for autocrossing with Hoosier A7s. And I'm still bottoming out the suspension on shortened bump stops. How are you running soft suspension and not just riding on the bump stops during corners? Or, have you set it up like a Miata where the bump stops are an intentional part of the suspension and you're tuning bump stop durometer? My ride height is low, but not crazy low. Front ride height is just enough that the front control arms haven't quite gotten to horizontal; back is set so car rake is about zero. Would like to go a little lower, but roll centers get really poor and spring rates are crazy high with so much reliance on bump stops.