nc7s4

Thank you for the lead - I will try to get a measurement on bump steer. Not that I will be able to fix it, but at least it will help me understand the dynamics.

I've finally got the new springs installed and it all fits. The front gets the larger diameter springs and the rear gets the smaller ID springs. This is great because the front requires far stiffer rates which is only really available in the larger ID springs. 10 inch springs are too long, it needs 8 inch springs. The perches are set at the point where they are just starting to push on the springs - hand tight. That gets the ride height close. For my car, I think this is a good setup.

Those look really nice. The rear shocks are a little bit longer than the front ones on the wcm. Front and rear call for 8-in springs. Rear springs on my car need to be smaller diameter than the front. Ymmv. It looks like you have a few parts on hand to test fit which will be very helpful. I will let you know how my spring rates work out. I am still waiting for the 525/275 springs to arrive. Expecting it to be a harsh ride for the road but good for the track.

Correction, the oil plan clearance is 3" with the street wheel/tire setup. The perches could always get cranked up though depending on what type of roads you are driving on. 3" will be an issue if you are trying to drive over any protruding manhole covers etc.

Hello again, The F22C and F20C should be the same height. My car has a canton oil pan and the ride height is adjusted up enough to give about 4" of clearance with the 17" wheels/tires. With the 15" wheels/tires, the ride drops and oil pan clearance drops but that is OK for the race track. The motor mounts that I sent you will get the engine pushed right up tight to the hood which will also help. I switched my oil pan to the Canton oil pan. It is steel, so if it takes a hit it will dent instead of shatter like the aluminum one. Its also fully baffled. The stock oil pan and the canton are the same height so this wont help clearance.

Corey is sending the following -525 hyperco 8" 2.25 springs for the front -New hardware so that the bigger diameter springs will fit on the existing shocks (2x for front) - 8-In 275 1.875 ID springs for the rear. I didn't catch the brand name Draco no longer makes the 525 8-In 1.875 springs. However, I did find a company that was willing to order a run of them for a slight premium. Draco will only make a run with a minimum order (5 springs). Keeping that in my back pocket as a backup in case the 2.25 ID springs don't fit in the front for some reason. By the way, here are the dyno curves for the front and rear shocks > Attached dyno sheets for the #122119 rear and 122118 front shocks. The front shocks have considerably more rebound control. We built them this way to help dampen the stiffer spring and create some roll control. The rear shocks were built to create grip. 122119 (7).pdf 122118 (8).pdf

Yup. That's all getting reworked as we speak. Just a mock up in the pic. Fastenal has my 7" long 1/2" grade 8 bolts ready for me to pick up today. Also going to add a couple small spacers for the bearings. Car came with 6" bolts - all images I've seen have this issue

It would be excellent to get into the 2.5 ID springs but there are clearance issues with the rear axles and the front is also pretty tight. It would be a good test to see if those would fit - though I think the small body shocks might need some custom seats to fit the larger ID springs. If the larger spring ID is possible - then I agree it would be must better for cost, selection and durability

He had done setups for wcm's in the past. And apparently had info from those jobs. Difference being that 1.875 x 8 inch springs were more available back then. Their supplier is hyperco which now only sells the rates that we wanted in 10 in. Luckily I found draco springs which still sells the 8 inch, 1.875 id in the necessary rate. Plus they are a hot purple color which is going to look fantastic. Draco part numbers DRA-L8.1.875.550 DRA-L8.1.875.275

Sure thing. I just wanted to make a note here in case the rebuilder put in the same flawed order that I had recommended earlier!

Quick update regarding my new springs and shocks. They do not work!! 10-In heavy springs are too tall. Even at the top of the shock perch the ride height is too high. Need to figure out how to fit shorter springs. I think that only the rear of the car has clearance issues, front will fit industry standard 2.25 ID springs. The rear of the car will probably still get 1.875 ID springs, but the problem with that is that they are limited in what you can get. It looks like the heaviest 8-in option is 250 lb. That may be what I end up with in the back. If the front can fit 2.25 in springs then there is any rate imaginable in that size 8 in long.

That is an r160 differential from a WRX, I think. Good news is that it will be easy to replace the r160 with another r160 if you choose to do that. Those parts are easy to find since they came with several different Subarus. Bad news is you thought you got an STI rear end. I was also suspicious looking at your rotors in the back. Those look like WRX rotors which is a standard setup. Compare pictures of the rear cover for a r160 and an r180 to what you have. The STI came with an r180. Regarding the engine mounts, here is a picture of how I fixed mine. I got these rubber bushings from Amazon which have been holding up fine

That adjuster was pretty sketchy on my car. Really flexed when on the brake, to the point where it was concerning me that the pedal box might break off entirely. Here's how I hard mounted it

Those are the wilwood 12 inch rotors that come stock with the WCM. All cars I have seen have those in front.

Jumping ahead on you by about 10 steps but I just got these shocks and springs delivered in the mail. After a lot of pondering I decided on this set. Hopefully it saves you sometime shopping around Advanced racing suspension in Indianapolis. Person's name is Corey. Springs I went with are 500 front 300 rears. Shocks are not adjustable but tuned by the manufacturer to the setup. They know the car