hey guys kan i put a T2 tranny in my stock fc?? and will it make my kar any quiker. new to this so if the question is stupid excus me ok.

 

Yes, assuming that your mechanical skills are not as bad as your spelling. You would also need a T2 starter, flywheel of the same series as your engine, and slave cylinder, as well as either the Mazdatrix custom T2-NA driveshaft, or a T2 driveshaft, differential, and halfshafts.

No, it will make it slower due to the heavier weight.

 

oh because i thod that if i put a T2 tranny it would be faster but scratched the idea out if its going to make my car slower, thank you bro.

 

First thing's first, if it's hard to read, most people won't bother to answer. If you want to get your questions answered, please ask using proper english. We'll gladly forgive those whose english is not their primary language, but judging from your posts, that's not the case.

See the stickies at the top of the 2nd gen section, stuff like this is covered in there. Also, ALWAYS do a search before posting, most of the time you'll find the answers there and you'll have your answer sooner without taking up space needlessly on the forum.

Finally, as for the transmission, no, it won't make you any faster, the gearing is practically identical other than 5th gear, which varies based on series (the S4 TII does have the lowest 5th of all, but only by a little).

 

I have put a Tii transmission in my S5 n/a and the first 3 gears(if memory serves) are slightly closer, but any benefit is gone from the added weight.

 

They're only fractionally different. 1st gear NA: 3.475:1, 1st gear TII: 3.483:1, 2nd gear NA: 2.002:1, 2nd gear TII: 2.015:1, 3rd gear NA: 1.366:1, 3rd gear TII: 1.391:1, 4th gear on both: 1:1. 5th gear depends on series and transmission: S4 NA: 0.711:1, S5 NA: 0.697:1, S5 NA GTUs: 0.754:1, S4 TII: 0.762:1, S5 TII: 0.719:1.

So as you see, they're very, very close to being the same other than the 5th gear. The difference in rpm drop after shift from 1st through 4th gears comparing the TII to the NA baseline is 1-2: +0.6% (more rpm drop with the TII box), 2-3: +2.5% and 3-4: -4.9% (less rpm drop with the TII box). Not enough to make a difference really and the only good reason to run one is that you've got enough power to make the NA box's strength insufficient.

 

What is the max rated input power for a S5 N/a trans? I'm going to boost it but I dont want to change the trans... just rebuild it.

 

There not worth rebuilding, just get a t2 trans if you are planning that. I rebuilt my n/a trans once already and now I need to do something with it again. And my n/a is only putting out a little over 150 rwhp

 

If you swap in a T2 dont you have to change the driveshaft and some other things? Mines doesnt exactly need a rebuild but if I'm gonna have it out then I might as well. The shid=ft bushings are the worst part of the trans thuss far. I like the tall S5 5th gear and I'd like to keep it for decent highway milage.

 

I think its mazdatrix that sells a driveshaft that will let a t2 trans mate to the n/a diff. Otherwise yes, you have to go with a t2 driveshaft, diff, and halfshafts. And don't forget about the flywheel and clutch too.

 

So basically everything drivetrain from behind the engine block.... or rebuild the N/A trans... will the N/A handle 300Hp at the wheels? thats all i'm really looking for.

 

Not for long.

 

hmmm.... ok... back to the drawing board.

 

The NA diff is much stronger than the trans, there's no real reason to upgrade the diff unless you're going to have serious power, or if you're planning on drag racing maybe. Using the Mazdatrix driveshaft is probably cheaper than swapping to a TII diff anyway.

A lot of the stuff that you have to replace to get a TII transmission in there is a good opportunity for an upgrade, or is stuff that could do with replacing anyway due to age and miles. The clutch at least should be upgraded if you're going for more power and a light flywheel is a good upgrade. The crossmember bushing is surely shot, the mounts are probably sagging and cracked, the driveshaft U joints do wear out and the clutch hydraulics can leak and fail in their old age.

At 300whp, you'll almost certainly break the NA transmission in short order, especially if that 300whp is backed up with turbo torque.

 

You can also use an auto driveshaft to go from turbo trans to na diff. It is pretty wimpy looking though.

 

I don't believe that it will work. I saw a post where it showed the specs between the different driveshafts, and it won't work safely if it would work at all.

 

ok thanks for the info guys, so i guess everything has got to go, guess i'll be looking for a t2 drivetrain all the way to the halfshafts. Just put a new (upgraded) clutch in there so I didnt want to change that, but it wont work with a t2 trans will it?

Are all the T2 diffs LSD?

 

No the upgraded clutch won't work with the TII transmission, as you'll need a TII clutch and flywheel. You probably don't need to change the diff for strength unless as I mentioned, you're planning on drag racing.

S4's have clutch type LSD's which wear out, but are rebuildable, S5's have viscous type LSD's and the fluid breaks down over time and it's not able to be changed. No stock diff will be particularly strong, if you're swapping, you really should get an S4 unit and rebuild it to get the best performance. Another option is to use a Miata Torsen (NA diff) or an FD Torsen (TII diff). These are nice and smooth for street use and don't wear out, but can't transmit power if one wheel's unweighted (not that a worn out S4 unit could).

 

No, it is too short and will not fully seat even though it may look like it is working properly. This can kill you.

 

^^ +1 - bad idea

 

So what is it exactly about the TII tranny that makes the driveshaft not fit? I'm assuming it's longer? Also, with the flywheel, smaller diameter? If I order a Lightweight flywheel for an S5 TII that will bolt right up to my S5 NA engine right? Starter, obviously if you have a different flywheel... Slave cylinder? What's the difference between the NA and TII?

 

The AT transmission is about 2" longer, which makes the driveshaft is about 2" too short.

The TII flywheel is a larger diameter.

Yes, but you will need to also install a corresponding counterweight, which is usually an AT counterweight. The flywheel vendor will tell you which counterweight is needed, and may even include one with the flywheel.

The TII flywheel will not work with an NA transmission bellhousing.

The cylinder body has the mounting holes in a different place.
https://www.rx7club.com/attachment.p...7&d=1212622757

Oops, I forgot to mention the clutch. The TII transmission clutch spline is larger so an NA clutch will not fit.

See also these links:
http://www.rotaryresurrection.com/2n...in_differ.html
http://www.16paws.com/rx7/index.html

 

Fantastic link, paired with excellent information. Thank you greatly kind sir!!