6 replies to this topic

[Steve66]

Working my way through HPDE with the goal of getting into SM.

At the track this weekend someone mentioned that I would need to remove the 6-speed transmission in my car and replace it with a 5-speed. Is this right????

Reading through the rules it doesn’t appear to say that but I’m only just starting so maybe there’s something I’m missing? Section 14.1 just says it has to be unmodified and stock for the year.

[ChrisA]

SCCA-GCR > Spec Miata 9.1.7.

 

2. Transmission/Final Drive
a. Transmission and final drive ratios must remain stock for the year of car. All cars shall only use the
5 speed transmission and the 4.3 differential ratio. Transmission gear ratios must be stock. All cars
may use the stock 4.3 unmodified OEM open differential or one of the approved alternates listed
below.

[Bench Racer]

SCCA 

 

2. Transmission/Final Drive

 

a. Transmission and final drive ratios must remain stock for the year of car. All cars shall only use the
5 speed transmission and the 4.3 differential ratio. Transmission gear ratios must be stock. All cars
may use the stock 4.3 unmodified OEM open differential or one of the approved alternates listed
below.

 

NASA

 

14. Transmission / Clutch & Flywheel / Differential

 

14.1 Transmission

 

Transmission must be unmodified other than updating or backdating replacement parts. Gear
ratios must remain stock for the year of car. Shifters may also be updated or backdated but must
remain OE (90-05). Shifter bushing may be replaced with alternative materials not to differ in
function of OEM plastic shifter bushing.

 

Hmm!! 5 speed, 6 speed. See APPENDIX A which shows 5 ratios for all year cars.

[Steve66]

So with the SCCA it’s clearly 5-speed only but NASA is unclear.

Any idea who in NASA I would contact to get clarification?

[chris haldeman]

NASA is 5 speed only as well

[Ron Alan]

And if your 2001 is an oem stock 6 speed it has a stock 3.9 rear end. Good news is that combination will fetch more than enough to replace with a 5 speed and 4.3!

[Jim Drago]

So with the SCCA it’s clearly 5-speed only but NASA is unclear.

Any idea who in NASA I would contact to get clarification?

it's clear, its 5 spd and the 6 speed boxes are junk and not raceable IMO. Gates way too close

 

If goping to Sm, change, the sooner the better