Well the turbo GA has been running great. Thing just flat out rips at 11PSI and above, powerband is perfect and so totally usable on a roadcourse. My original plans were to try and make more power with the car but with the way it sits that is not necessary! I realized this after doing the track day at this years SERCA convention. After giving several SR20 owners (turbo, vvl, etc...) rides I realized the power is so well balanced I do not want to mess with it. And this is just at 11PSI when I normally run 14-16 PSI regularly.....
I have decided to fully sort the car suspension, brake, and aero wise. My first step was to upgrade the suspension. I posted the details of this in the Koni thread, but many people have not seen it thus I thought I would re-post for people to check out.
Here is a decently thorough write-up of the shortened Koni setup I built for my car. I could not have done this without the help of Steve Foltz, Lee at Koni, and Jon at O2 induction.
I chose the B15 Inserts and off the shelf rears for my project. I plan on starting with 350/300 spring rates and possibly going up from there. I will not run more than 450 though so that is why I chose the Spec V inserts. I also wanted to be able to use my OEM housings as well. I also chose to use the Koni sleeves and perches rather than thr fround control. I think they are better quality and actually are a smaller outer diameter which is nice.
Here is the donor housing looking a little worse for wear.
I drilled a small hole in the bottom to drain the fluid and then enlarged it with a step bit.
Next I measured and cut the end of the housing to remove the OEM strut rod assembly.
Nest I cut off the stock spring perch assembly and then ground off the welds.
Next up was a trip to O2 induction for some machine and welding work.
We machined the top of the Koni insert so that the KOni sleeve would be able to slide over. We did this so we could assemble the insert in to the OEM housing and then install the sleeve afterwards. This will also allow us to remove the sleeve if we ever have too.
We also took the rear spring perches that Koni provides and machined them down to use as perches for the Koni coilover sleeves. They are step machined to match the OD of the Koni sleeve and also match the inner step of the Koni sleeve.
Here we fit the sleeves for welding, the tape was used to hold the sleeve in place to level the perch for finish welding.
Welded Perch
Machined step for coilover sleeve.
Here is how the sleeve will fit once it is finally assembeled.
Next the housngs were powder coated flat black and paired with the inserts and necessary install parts.
Next I cut 12mm off the end of the insert.
Insert prepped with JB weld.
Insert fully seated.
Here is a closeup of the proper parts needed to finish the bottom off. Star washer, fender washer, and bolt provided by Koni. The black ring is a 1" x 5MM thick headset spacer I bought at a bike shop. I followed Steve's advice on this and it worked perfectly!
Assembly duct taped and ready for the install of the Koni sleeves.
Sleeves siliconed in place and ready for perches and springs.
Here is what we did with the rears. Again B15 Spec V rears with Koni sleeves and perches.
Here you can see the circlip on the rear that the Koni sleeves is designed to rest on.
The Koni sleeves are too long for the position of the circlip on the B14/15 rear setup.
We cut the sleeves down on the band saw.
Next we used some silicone to hold the sleeves in place.
Rears completely assembeled.
