My WCM S2k upgrade project.

[charles5448]

30 minutes ago, nc7s4 said:

Do you happen to know the specs for rake? Like height at all four corners and where you measured from?

 

If you follow the story of my WCM, you'll see I'm starting from scratch on alignment specs. 

[MV8]

1 hour ago, nc7s4 said:

I ran some similar calcs based on the wire size and got that too.  However, looking at what qa1 sells in this size shows the lighter springs.  Mine sure look like these ones 

 

https://qa1.net/springs/1-7-8-inch-id/

There probably are seats you can fit to run a 2.5 or 2.625 id, 10 inch spring as stiff as you want. 1.875id is near the max rate available at 500#. You are not limited to using QA1 springs.

[nc7s4]

134mm and 99 mm taken at the blue tape marks.  Note that this might not be so useful because it's measured with the street wheels which has a much larger rear vs front.  225/40/17 vs 245/40/17.

 

Race setup is all 245/50/15 

 

Race setup was used to set the ride height and that was a difference of 15mm front to back.  Front was set first to give the oil pan enough clearance.  

 

Thank you @MV8I am now pretty sure there are cut down 500lb springs.  I searched through summit racing and other places.  The only 1.875 id springs that are 500 lbs are 10 inches long.  My car was ran a lot lower prior to me getting it, so they probably had to cut the springs down 

 

All starting to make sense 

Edited October 17 by nc7s4
Added image

[nc7s4]

Also you need to put some ballast in when you set the ride height.  Measurements above are with no driver weight. 

[MV8]

12 hours ago, nc7s4 said:

Thank you @MV8I am now pretty sure there are cut down 500lb springs.  I searched through summit racing and other places.  The only 1.875 id springs that are 500 lbs are 10 inches long.  My car was ran a lot lower prior to me getting it, so they probably had to cut the springs down 

 

All starting to make sense

The coilovers are fully adjustable. No need to cut springs and they do not look cut. The allen screws are loosened so the upper seat is free to rotate on the threaded damper body. The allen screws do not need to be very tight to keep the seat from rotating.

 

I suggest leaving the springs as-is and adding an anti-roll bar to the front.

[nc7s4]

@charles5448 here are some more recent numbers for my car

 

note: this setup is about to change because I am changing from 500/500 springs to 500/300 springs.  

 

500/500 was likely contributing to an oversteer condition - which I tried to get rid of with some extra negative camber and rear toe-in .  When the new springs go on - I think it will end up quite a bit different.  Here is a quote from Loren on the baseline setup which I will try to shoot for with my new shocks & springs.  BTW - "Advanced Racing Suspension" in Indianapolis is a great place to go for the springs and shocks should you chose to replace them.  Guy I spoke to is named Corey and he is familiar with the WCM setup

 

> Ultralite typical set up is -1.2-1.5 camber all the way around. Front caster 4.5-5.5. The 5.5 will be a little heavy on steering but it track very straight. I run rear toe at zero. The front toe .1 degrees toe in.