fast86rx-7

i was wondering when doing a tII swap without changing to the tII drivetrain what breaks first the tranny or the diff and axles?

i know they say that the n/a drivetrain can handle 250 hp but is that the trans or diff/axles


reason is i am trying to budget an 13b-re swap and want to be the most reliable i can be without the huge amount of money for the whole drivetrain

my plans are to use a tII tranns and n/a diff with the mazdatrix driveshaft

ItsNiceToBurnRice

the N/A tranny is junk, you will be lucky to run 200hp on one, and that is considering it is a "good" tranny. plus youll need the rear diff, dont half *** a tII conversion, you will pay for it in hours of labor later on.

rarson

My understanding is that the N/A LSD's are pretty good at holding power and shouldn't be a problem. The N/A tranny is pretty weak, but it's important to note that tranny breakage is MUCH more a function of how you drive than how much power you make. I've broken other trannies making barely more power than stock, while other people can baby their trannies while still putting big power through them. I think you'll find the biggest strain on a tranny is the launch.

Anyway, enough of that, I'd say that the TII tranny and N/A LSD isn't a bad idea. Especially since you probably won't be making over 250 hp.

papiogxl

iTrader: (6)

Aaron cake has broken the drive shaft, multiple times, the NA tranny is stronger than given credit for.

NOPR

if you get the t2 tranny and a nice, new custom driveshaft you should be okay.

fast86rx-7

like i said i am going to order the custom driveshft from mazdatrix for this purpose its only 290

FC-DRIFT

this is very true. if you drift or race you're putting alot of stress on the drivetrain I have gone through quite a few diffs so i desided to just weld them. trannies are good but if you got a race clutch they don't last long.

FC-DRIFT

my plans are to swap the 13b-rew motor and trans to a t2 rear end and call it a day. yeah i know it's pricey but hey it's worth it.

fast86rx-7

how does the fd trans bolt up is it a custom job?


i have a thread of what i am planning on doing
heres the link to the thread
https://www.rx7club.com/other-engine-conversions-non-v-8-118/planning-13b-re-swap-564000/

Jager

iTrader: (10)

No, the REW isn't worth it at all.

fast86rx-7

i read that the input shaft is to short

Aaron Cake

iTrader: (1)

That's not entirely true...

As someone else in this thread mentioned, I've broken the driveshaft twice, but never the NA transmission. First shaft was stock, didn't last long before I shattered the front u-joint at the track. 2nd shaft was made by a local shop and declared "unbreakable". Large Dodge truck u-joints, shaft twice as thick as stock. Recently I brought it to a shop to have the u-joints replaced and the showed me how I had twisted both yolks and cracked the u-joints.

As for the rear end, if it can stand up to V8 conversions, it will deal with a TII/RE conversion fine.

That said, at the very least I recommend that you do use the TII transmission and a custom driveshaft to connect to the NA rear end. Many of the NA transmissions are worn at this point while the TII transmissions obviously hold up better.

fast86rx-7

thank you aaron cake


im glad someone that has experiance could reply
i feel alot better with my descision

i am definatly going to run tII tranny with n/a diff ith the mazdatrix driveshaft

rarson

Well, on the plus side, the NA trannies are a dime a dozen, but then again, it sure is a pain to keep dropping and replacing... let alone being stranded somewhere with a broken tranny.

Listen to Aaron, he's the man when it comes to the NA drivetrain.

socalrotor

iTrader: (1)

Hit me up if you need any help bro!

fast86rx-7

well right now im in the planning stage the swap will take place around febuary 07
thats when i get my loan payment

i want to be ready and knowledged "less room for error"

i cant really have the car down long

i have done an engine swap before that was harder than this and it only took me 8 hours

the only part of this swap that will be different for me will be installing the microtech "never ran standalone"

MARTIN

Well, I'm still using the n/a tranny, and I ran 20lbs of boost on a t70... More than double the power of a stock s5 TII and Still, I shattered a puck clutch before anything has happend to the tranny..

fast86rx-7

lol definatly makes me feel better my n/a tranny is crap 4th is going out and sycros are also on way out

so def. going to get a tII tranny

MARTIN

Yea, well, thats a different story. Goodluck either way..

deetz

so will a t2 driveshaft bolt up to the n/a diff?? is the flange on the end the same??

Icemark

no, the flange is not the same. A turbo drive shaft does not match up.

and I agree with aaron tp a degree... the only weak point I have sen on the Non turbo rear end (besides that most of them are not LSD) is the half shafts.

The non turbo half shafts shear right off at the mount at the diff on a considerable load. I think the reason that many V8 and like high horse power conversions don't have the issue, is that they break traction relativly easy. Its when you have high tractiona dn high horse power that they break.

eddierotary

iTrader: (7)

i have a turbo II engine making somewere about 250hp, of course i have the turbo II tranny but i have a N/A open diff and it seems holding pretty good so far. 20K miles later and still holding with no noise or vibrations

deetz

i awas running the same setup in my vert, a 13bre with a t2 tranny, and the n/a rear end, and guess what, the turbo driveshaft did bolt right up to it no problem,

Icemark

The only way that would work is if you used a automatic drve shaft (which is about an inch short but can be used in a pinch.

Now that would have the correct mate to the turbo tranny and a non turbo differential.

But the Turbo drive shaft has a bigger flange... it does not bolt onto a non turbos differntial flange. The bolt holes are not even close enough to elongate.

deetz

i just bought a 90 turbo driveshaft from mazda and bam it fit right him, guess i got lucky huh i will post pics up tomorrow just to show proof