Another Toy: My '91 Miata

Resting in the paddock at the Columbus IN Pro Solo.

My Miata is primarily stock. I race it in SCCA Solo-II and Pro Solo2 .

Some day, when I no longer need to keep this car legal for the SCCA SOLO 2 stock classes, I've started planning what I'll do with this project car:

supercharger

I've bought a Nelson-packaged Paxton belt-driven centrifugal supercharger. This is a slightly :-) oversized unit originally designed for 5.0 liter V-8s. That should make it capable of producing whatever level of boost I eventually want.

springs

I want to lower it a bit and stiffen it up alot. I'm still researching who makes the stiffest springs for a Miata.

sway bars

I want the stiffest sway bars I can find. Right now, that looks liek Eibach bars.

wheels

I want to go plus-1 or plus-2 with the wheels and tires. I'm torn between Panasports and BBS RC or RX wheels.

exhaust

with the forced induction, I'll have even more exhaust to get rid of. That measn I'll need headers and a big-bore exhaust. The Jackson Racing header looks good right now.

• installed a Hard Dog rollbar. It's a 4-point attach (at the seat belt anchor points) and it makes me feel a little more secure - especially when lapping at the track.
• installed GAB 8-way adjustable shocks. These are very adjustable (both compression and rebound damping) and help me make up for the fact that I can't change the springs in the stock class. I generally run the GAB's on "1" on the street and "8" on smooth autocross and track surfaces, with settings in between for rougher surfaces.
• installed a Leistritz cat-back exhaust. This replaces the exhaust from the catalytic converter on back and is a little lower restriction. It also sounds great. Maybe good for about 5hp.
• mounted DOT-approved racing tires. I mounted BF Goodrich R1 tires in the 205/55-14 size on my original rims. These are for the street and can also be used for track time or for autox if I don't feel like hauling the spare rims and changing tires at the event. I also bought (used) a set of MX-3 alloys (these are the wheels in the picture above) that are dimensionally identical to the original rims. I currently have Hoosier competition radials on them with the autocross compound (also 205/55-14). These tires cannot be driven on the street though, so if I want to use them at an event, I have to change tires there before and after competition. Incidentally, you *can* actually carry four tires mounted on wheels in the interior of a Miata. You lay one down on the rear shelf behind the seats, stand one in front of the passenger seat against the dash, and lay the last two behind it on the passenger seat. It's cozy, but it will work - and you can still see your passenger-side mirror. I'm thinking about building a tiny trailer to carry my tires to events...
• changed the alignment to a more race-oriented one. This means maximum available negative camber (front and rear), maximum available positive caster in the front, neutral toe in the rear and about 1/4" toe out in the front.