Like braking into t14

 

Depends on the condition of the transmission. I've made over 600rwhp with them without problems. Back in the day when you could still buy brand new units from mazda they would hold up a lot longer at high power levels.

 

What gear oil do you like for the trans and diff?

 

hmm k, i was also looking at the altezza 6spd gbox (j160) also use in the s2000, mx5, s15,etc....

 

This one single gearbox from Toyota also fits Honda, Mazda and Nissan?

 

my bad wording......i should of said same in internals but different bellhousing,etc...
im still researching for a good strong rwd box besides a J154 supra.....really expensive and hard to get

 

Whats wrong with a T-56? They're everywhere and will handle you hp and tq needs.

Does someone make the adapter stuff for that or is it all still custom?

I remember reading Howard Colemans thread about it but don't remember the outcome.

 

Not sure how much use it would be, but perhaps cryo a used unit. I've heard that it improves the longevity, wear and strength considerably. I have blown 4 FD transmissions with less than 350hp. 2, I sheared the output shaft at the splined tail section doing antilag launches at the drag strip with MT ET Streets and about 8psi off the line on stock twins, ran 2 back to back 11.7's and POW. The others broke teeth on 3rd gear and broke the counter shaft on the road course. Yup, broke the counter shaft! Ouch! That's $2K in anchor weights! All used trans' and various mileage, but also running 4.77 gears and Kaaz diff.

 

hmmm wow.....so rx7 boxes r glass more or less.....unless i drive like a ***** all the time lol...

 

These transmissions are bulletproof when run at 220ft-lb. When you increase torque to 300, 400ft-lb, and they break then "glass" is one way to look at it.

The RX-7 was highly optimized for weight reduction. I'd say they did an excellent job in the transmission. If you want grossly overbuilt parts you should look elsewhere.

 

the engine im using is a torque monster so i wanna use something beefy....check out the rb25det gearbox.....looks beefy.....suppose to handle over 500whp safely and are easy to find for a reasonable price
may be a potential upgrade for the rx7s looking for that xtra reliability....

 

how do i edit posts.....thats the wrong pic lol.....thats a rb25de....no t

 

I am making over 600 whp w/ 500 ft/lb on the FD trans and it is holding up fine (knock on wood), I do have several spares just in case it crumbles. We also have customers that drag race with 500+whp that have had good luck with their trans.