Mating a Miata transmission to the Busa Engine

[Alex Vendler]

Speaking of clutches, I'm not confident that a clutch designed for a 7,300 RPM fuel cut will be safe at 13,000 RPM. I'd be looking for something that was rated for that level.

 

We are taking power off the gear reduced countershaft in the 'Busa engine not the crankshaft! It's reduced at a ratio of .625 so 12000 crank rpm is reduced to 7500 clutch rpm. This also means that the stock Miata rear end gear will yield a top speed within a usable range. This also multiplies the torque. Take another look at this article about the rig here:

 

http://www.motoiq.com/magazine_articles/articletype/articleview/articleid/1519/project-miatabusa-part-1-what-the-hell-we-are-thinking.aspx

[Tralfaz]

Speaking of clutches, I'm not confident that a clutch designed for a 7,300 RPM fuel cut will be safe at 13,000 RPM. I'd be looking for something that was rated for that level.

 

They are keeping the primary reduction gear in. Max RPM to the Transmission should be about 7000

 

11,000/1.6

[Alex Vendler]

Updates!!! Take a look because the airbox/filter assembly we are prototyping will work on any 'Busa powered project that has hood clearance issues. Yes we will sell them separately!!

 

http://www.motoiq.com/magazine_articles/articletype/articleview/articleid/1704/project-miatabusa-part-43--the-intake-manifold.aspx

[Tralfaz]

http://super7cars.com/gallery%20intake.html

[Alex Vendler]

I've seen that part. It's pretty, and well made too. Only issue is that is triples the length of the intake runners. It also negates the bi-length runners that come on a 'Busa to spread out the torque. Still a nice solution.

[danilo]

BTW, the reverse gear on a Miata transmission is synchronized. The only other car I know of that does that is the Lamborghini.

 

1990(?) Saab 9000 has/had synchro reverse Big deal :-)