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[Jason@SportsCar]

Originally Posted by cali yaris

how does an aluminum flywheel fit into your class? I'm still so confused about what you can do and can't do.

Loren posted the applicable section, and as he inferred the Solo and Club Racing rules are typically different. Even more confusing in some cases due to the class acronyms being similar, but having different meanings - Solo P=Prepared, Club Racing P=Production.

However, in our case (HP limited prep, Level 2) our rule set is very similar to the GP Solo rules. Unfortunately the Solo Events Board elected not to allow the Yaris in GP, so we can not competitively race our car in HP trim in Solo - it goes to EP, where it is way under prepared, and way under powered.

In a nut shell:

Body - Car is gutted and has a minimum 6 point cage. On-board fire system, kill switch, race seat, 5-point harness, window net. Drivers and pass side windows must be removed. All other glass can be replaced with plastic, 1/8" for side and rear, 1/4" for windshield. Hood and hatch/trunk may be replaced with composite units. Bolt-on fenders may be replaced with composite ones. Uni-body (rear) fenders may be cut and flared, composite may be added. Crash support beams behind bumpers can be removed.

engine - Level 2 prep must keep stock throttle body and fuel injection (injectors, fuel pump and regulator can be replaced, you just cant change the TB or manifold) . We can do port matching, valve job, cams, compression bump with a limit set by SCCA (we still have not received our spec, but most every car can go +1 pt), over-bore, balance & blueprint. CAI, header, no emission, exhaust just needs to exit behind the driver and be under 103db @ 50'. Engine management is open.

trans - if we use a stock trans no issues, shifter is open, clutch/pressure plate and flywheel are mostly free (no carbon multidisc units). We can also change ratios and use dog engagement, but you get a weight penalty. Final drive is open. LSD is open.

brakes - must use OE front caliper. Front rotor can be changed to a two-piece (aluminum hat), but must be stock size, and can not cross-drilled or slotted. Rear may be converted to disc, but can not be larger than the front OE brakes, and the rear rotor must be a solid non-vented disc. Brake lines, pads and master cylinder are open.

Suspension Level 2 prep - Stock pick up points (you cant move the rear beam mounts like many Yaris owners like to do ), shocks are open, springs are open but must be in the OE location (this means no coil-overs in the rear, but you can use an adjustable perch fitted in the stock location). Swaybars are open. Bushings are open. Camber adjustment is open.

Wheels and tires - 15"x7" max wheel size for the Yaris, smaller is ok. Any tire that you can fit on the wheel, but the top of the tire must be covered by the bodywork.

Minimum weight for the Yaris in HP is 1900lbs (w/driver) using a stock trans.

There is more, but those are the basics.