Springs

[lowside67]

Originally Posted by titium

What shocks are you running?

Ohlins road and track. I have a small amount of preload on my 7” springs (running the car as low as it can go without the perch hitting tire). Incidentally, I have some new front springs enroute which are 500lb 6” to replace the 400lb 7”.

-Mark

[titium]

Originally Posted by lowside67

Ohlins road and track. I have a small amount of preload on my 7” springs (running the car as low as it can go without the perch hitting tire). Incidentally, I have some new front springs enroute which are 500lb 6” to replace the 400lb 7”.

-Mark

you might find that you won't be able to get the car low enough with firmer springs.

also preventing coil bind might be an issue.

[spxxx]

Throw a zip tie on the shock shaft before driving on track to see if you're even hitting the bumpstops.

[joeo]

Just as a data point; I'm running TCKline's setup with 7.25" front springs (350lb), and 10" rear springs (600lb). I'd like to a go a good bit stiffer. Hyperco makes a 500lb front spring with 6" length, and a 900lb rear spring at 10" of length. Need to do more reading and math...



Not sure if an 8" rear spring would be too short or not. If not, I'd like to go higher than 900 in the rear.

[berns]

I'm running SWIFT 8k 7" springs up front and 14k 9" springs out back with helpers.
KW Clubsport dampers

[bbnks2]

The answer to this question will vary depending on the strut you're pairing them with. With YCW an 8" spring is just fine out back and if I put a longer spring in then I would have to add pre-load and ride height and damping requirements would be affected. In the front, a 7" spring clears the tire but a shorter spring would be needed if I wanted to slam the car. I currently sit about ~10mm lower than BMW performance height.

[joeo]

Are the motion ratios of 0.97 (front) and 0.57 (rear) considered correct?
Thanks.