silverrotor

iTrader: (1)

Sorry for the Ignorance.
Turbo and associated are relatively unknown to me.

What are the differences b'n the s4 and s5 TII Trannies?

Does one have an advantage over the other In terms of Installing one In a s4?

What associated components would be needed aswell. I have a GXL (LSD Differential). So would that have to be swapped out too?

I'm making way for a TII Drivetrain to be able to handle my Insane Nitrous Install due over the Winter.

Scott 89t2

the S4 and S5 turbo trannys are similer. and could be swapped back and forth. however swaping either into your non turbo is a whole nother story...

OC_

well, i would say try the NA tranny first and see what happens. That could be a lot of fun, but i'd expect nothing exciting would happend. Iv asked about putting a turbo tranny in my NA S5, word is that you need a new clutch, flywheel pressure plate and drive shaft at the least. But i would put the better TII diff assem in too. For that youd need to get the TII half-shafts too.

suprfast7

well guys Ive got everything you need for the conversion besides a flywheel and clutch and Pressure plate for 500+shipping, besides the tranny being stronger the driveshaft is bigger and you will need the diff or the driveshaft wont fit, and the halfshafts are also stronger.
Pm me if your interested.

Evil Aviator

The S4 TII transmission has a .762 5th gear, while the S4 TII transmission has a .719 5th gear. In English, that means that the S4 TII transmission will have slightly better acceleration in 5th gear, while the S5 TII transmission will have slightly better gas mileage and a slightly higher rpm-limited top speed.

Yes, you need to swap out the LSD unless you make a custom driveshaft. Note that it is easier to swap out the entire rear end sub-assembly. To do this, you just disconnect the subframe, differential mount, and shocks. This beats the heck out of disassembling the whole thing just to change out the LSD and halfshafts.

On other web sites you may hear that the AT driveshaft will allow the TII transmission to mate with the NA differential. The AT driveshaft will fit the transmission, and it will fit the NA differential, but it is about 2" too short. I'm sure that there are many people who think that they made it fit, and quite franky these people scare me. Here is a link to transmission pics, and a link to the Factory Service Manual (How-To's/Manuals):
http://www.16paws.com/rx7/index.html
http://fc3s.org/

Besides a TII rear sub-assembly, you will also need:
1) TII slave cylinder - These go bad, so buy a new one for half Mazda's price at your local generic auto shop. No, the NA cylinder will not work. Yes, the part number for the piston rebuild kit is the same as the NA, but the cylinder is different.
2) TII starter
3) TII clutch & pressure plate
4) TII flywheel - Needs to be of the same series as your NA engine to work with the counterbalance and rotors.
5) TII driveshaft - The 2gen driveshaft is a very bad design, and goes bad after about 80-150K miles. I recommend getting a new one, especially with a high-output engine. A friend of mine had a driveshaft seize on his 2gen, and the vibration destroyed his entire dash and console. I would hate to see what would have happend had he been going over 30mph.

... and heavier.

TonyTurboII

I just got a tear in my eye from laughing so hard.

silverrotor

iTrader: (1)

These are some really good responses

. Thanks. When you say heaver, by how much more?

It looks like I'm going to need a doner car b'c I'm going to do It right with 75- 100 shots (wet setup) of Nitrous.

I sincerly doubt the na Drivetrain will be able to coup with that kind of power.

silverrotor

iTrader: (1)

So, how much heaver Is the Turbo Tranny, you guys say?

ZachSpazz

Wow...I'm assuming that the sunbaked dash vents couldn't take it, or what? I've never heard of this happening before.

DaleClark

iTrader: (55)

I don't get this. Yes, if a driveshaft has a severe failure, it will do all kinds of bad damage. But, the TII's have mighty beefy driveshafts. In my 7 years of working on RX-7's and the 40-50 some cars I've personally worked on, I've NEVER seen a bad TII driveshaft. NA driveshafts go out like candy, but TII's are REALLY durable.

A bad U-joint will give you plenty of warning before it heads south, too - the car will shake like CRAZY with a bad U-joint. If you let it get to the point where it breaks, you're just a dumbass for neglecting the car. It's REAL obvious that something's seriously wrong.

Dale

Evil Aviator

The TII transmission is 19 lbs heavier, and the thicker driveshaft, halfshafts, and LSD will add to that. It will not make that much difference on a street car, but if you are a serious drag racer, then it will hurt your times a bit.

Actually, if you do not spray off the line with slicks, then the NA transmission may hold up for a while. If the N2O comes on at higher gears and while the car is moving, then it's not as hard on the transmission. You may want to install a scattershield just in case, though.

Yes, a donor car is the way to go if you want to install the TII drivetrain. You can get an S4 TII with a blown engine for about $500, and it will have everything you need.

No, the entire dashboard cracked, the center console was destroyed, and parts and pieces flew out of the dash. The instrument panel was OK, though, and now he has it zip-tied to the steering column. He was going to strip the car, anyway, so it wasn't a big deal. Most people would replace their driveshaft at the first sign of binding, but my friend is one of those people who has to take everything to destruction. He knew it needed to be replaced, but didn't expect it to sieze all of a sudden like that. Lessons learned.

I haven't noticed any difference, as both the NA and TII have u-joint problems, which totals the driveshaft. I've seen quite a few bad TII driveshafts. In fact, there is one sitting in the garage where my 20B project is parked, and the 10AE parked next to my car just had its driveshaft replaced.

Evil Aviator

LOL, but it's still not as funny as the guy who replaced one of his NA rotors with a TII rotor and wondered why the idle was erratic.

Felix Wankel

That was a classic.