Originally Posted by skov (Post 93066)

Those shock lengths are fine, but I wouldn't take the spring rates as gospel.

Nathen had started supplying 400lb springs for the front as he thought it rolled too much, which is what I ended up with.
From my experience that's a recipe for massive understeer. It also gives a horrible jolty ride on bumpy roads as the rear can't react fast enough to catch up with the front.
I'm not convinced Saturn's original values would be much better either.

Having done some calculations (albeit full of assumptions/guestimates/errors) I came to the conclusion that the rear needs to be around 100lbs harder than the front, and that 300 front / 400 rear would be a good starting point.

As a quick test I swapped mine over and put my 250lb springs on the front and my 400lb springs on the rear and went out for a drive.
Have to say it's transformed the car!
The ride is far more composed on bumpy roads, and I've got shed loads of front grip.
It's possibly gone a little too far the other way, as it's ever so slightly tail happy now. It is however nicely controllable and much more fun that way :)
I'll get some 300lb springs for the front and report back at somepoint.

Originally Posted by PorkChop (Post 93071)

I don't know the spring rates used, but Spud's car seemed fine to me WRT suspension set up when I've been out in it. I'm guessing Spud used his car as a starting point for speccing the MX5 build.

Originally Posted by jason 82 (Post 93211)

I don't mean to be thick, but if the coilovers we require is 13inch + a 1 inch extention, why don't they specify 14 inch coilovers ? Or am I missing something ? :confused:

Originally Posted by skov (Post 93066)

Those shock lengths are fine, but I wouldn't take the spring rates as gospel.

Nathen had started supplying 400lb springs for the front as he thought it rolled too much, which is what I ended up with.
From my experience that's a recipe for massive understeer. It also gives a horrible jolty ride on bumpy roads as the rear can't react fast enough to catch up with the front.
I'm not convinced Saturn's original values would be much better either.

Having done some calculations (albeit full of assumptions/guestimates/errors) I came to the conclusion that the rear needs to be around 100lbs harder than the front, and that 300 front / 400 rear would be a good starting point.

As a quick test I swapped mine over and put my 250lb springs on the front and my 400lb springs on the rear and went out for a drive.
Have to say it's transformed the car!
The ride is far more composed on bumpy roads, and I've got shed loads of front grip.
It's possibly gone a little too far the other way, as it's ever so slightly tail happy now. It is however nicely controllable and much more fun that way :)
I'll get some 300lb springs for the front and report back at somepoint.

Originally Posted by CTWV50 (Post 93921)

Cool I'll swap my 250lb and 400lb around during the final build.

Originally Posted by Davidbolam (Post 93927)

Hopefully I will get to test it on an airfield before the road and iva anyway as a shakedown

David