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Originally Posted by jakob66
Quote:
Originally Posted by M3 Number 86
Going to up my rates in the rear and need to know sizing.
I believe the stock is 220mm which is around 8.7".
Going for an 800lb spring in the rear and realize it won't compress as much. So trying to figure out the correct length to get.
I've been told to use a 6.5" spring with helper or an 8" without helper.
Sound right?
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On my track car, I'm running 150Nmm/140mm in the front with no helpers (see my strap solution in another thread, works great) and 180Nmm-200mm in the rear with helper, all springs from KW. The shocks can very well handle this and more.
All this depends on your driving, weight and ride height. My car is with driver & 3/4 gas at 3610lbs, ride height in the rear is at 566mm (fender to 18" rim).
Hope that helps
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Thanks! I asked you about the strap as the fronts already have no helper. My rears are stock with no helper so gonna go do some math to see if an 8" at a higher rate will be ok at my correct height. I feel like someone stole my ear helper springs at some point lol