I'm Back! '90 GTUs

[project86]

Originally Posted by infernosg

I'd say about as much as the N/A RX-7 transmission. That is, not too much. I've seen both transmissions completely disassembled and I didn't see anything that would indicate the Miata gear set is any stronger or weaker. That's not to say there aren't any differences. I used a gear set from a '96 Miata and I noticed the following differences versus my stock '89 transmission:

-Second gear has two synchronizers
-The reverse gear has a helical cut
-Small casting differences in the bearing plate
-No gigantic weight on the output shaft

I used the front (bell), gear (middle), and rear (tail) housings from the RX-7 transmission. The bearing plate and everything else were from the Miata transmission.

I guess i just got the idea in my head to do the miata gears swap and wondered how much power i could throw at it (maybe around 350whp max?).

Originally Posted by djmtsu

Ran a TII engine in front of my NA trans for 5 years of dragon slaying and spirited driving with absolutely no problems whatsoever. When I fragged that motor, the trans went to Charles, which he still might have around (maybe in Sheba).

So, like most RX-7 issues, its usually the driver at fault.

That makes me not worry so much. I guess I could always do the TII trans. But as i said above ^^

Originally Posted by TitaniumTT

That would be the truth.

We maintained a metric fuck ton of ITS cars up at Speed1. Teams would go through 3+ trannies a season and the failures were ridiculous. As in stripping the teeth from the gears.

Once we started cryo'ing the trannies they would last all season and just need new syncro's in the off season... and the fluid would drain gold It was fucking hilarious.

So you think if i had the gears cryo treated id be ok even if i ran around 350whp? I mean I'm not gonna be tracking the car. Just spirited driving really.