I am trying to build an N/A road monster and I need a "bullet proof transmission" pretty much or one that can take a beating. Getting started in drifting in Myrtle Beach. I know that the N/A transmission is not the best and that the tii takes a lot of adjusting to fit, but is there a way to use the gears from the tii trans and install them in the n/a trans? Also are there any high performance syncros that I can put in. I heard of some for a mustang that will never wear or break. Is there anything like that for the rx7 transmission. Maybe there is something else I can do that someone else did that worked for them... Let me know any suggestions and or knowledge that you have about this. thanks

Kyle

 

The TII trans is your best bet. If you swap the trans you may as well swap the entire driveline (driveshaft, diff, axles, flywheel & clutch), as they can take more than most any NA motor can throw out. You could halfa$$ it and install the TII trans, clutch, flywheel and use the mazdatrix driveshaft to adapt the trans to the NA diff.

 

TII Transmission
TII Clutch and Flywheel
TII Starter
Mazdatrix adapter driveshaft

Tada!

 

So my best bet is to just replace everything from the flywheel back with tii products. Isnt the bell houseing bigger on the tii transmission. How would I adapt it to the engine?

 

It's all the same, all you need is what i listed.

 

Uh, many people have been running turbo N/As on stock transmissions without problems. For anything N/A related, the stock transmission will hold up just fine - worry about it until you actually do break it...

 

i agree the na tranny should be fine but it the mean time pick up a tii drive train and have the 2nd and 5th synchros redone on it and throw it in when you break the na stuff.

 

Na trannies are weak, they dont hold well past 250hp.

 

Who's to say this guy's N/A will be hitting 250hp? Not to mention Aaroncake's turbo N/A used the N/A tranny just fine

 

I guess it depends on teh type of driving. Drifting is going to be harsh on the tranny.

BTW waht type of lsd is in the NA version? A s4 t2 clutch type lsd would b nice for drifting. SHim it so it locks up more.

 

drifting isn't what anyone would call "nice" or "easy" on the tranny. even if his motor was only pushing 180rwh, shifting that hard all the time isnt going to last that long... especially on an N/A tranny. go with the TII tranny and make up the rear end as you go along. remember that your drift isnt going to be much uless you have a good diff. your diff will make or break you in almost any drift show/contest.

 

There's no such thing as a bullet proof transmission.

If everything on the car was "bullet proof" it wouldn't win any races because it would be too heavy.

Just admit the fact that if you drift competitively, you're going to have to rebuild the transmission once in a while.

Miata gears might help though... if only because they have better ratios.

 

TII trans is still the better option.

 

Clutch slave cylinder is different as well.

 

Wow Lots of info. I am aware that there is not a bullet proof transmission. I was just thinking there were somethings that I could do to make it a little stronger. for right now I am going to stick with what I got. My car at this point is sitting in the driveway with the clutch not disengaging. I think the clutch plate has shatter from the splines and is just turning with or without the clutch peddle depressed. I installed a regular OEM clutch in it, nothing special, but I am a pretty hard driver. I pretty much drive like I am racing all the time. What would be the best clutch to install? I was thinking an ACT or Exedy. Stage 2 or 3. I am slowly working on this car and hopefully going to make it on of the fastest n/a's on the road. With a lot of time and a lot of money I should make it.

 

ive had both act and exedy i prefer the exedy

id also like to know about better syncros

 

The TII driveline would be the best bet for extremely harsh applications that do not have race class restrictions for this mod. I don't drift, so I am not sure if this would be a requirement though. The one problem with the TII driveline is that it is heavier, so if you don't actually need the extra strength in all those areas, it's better to stick with the NA components.

A good RX-7 or Miata SCCA race shop can modify the NA transmission to take more abuse. Most race shops remove the synchros, so be forewarned.
http://iscracing.net/

LOL, yeah, it's going to take a lot of time and money to compete with those nuttty NA guys. Most of them have well over $50K in their cars. It's pretty funny to watch them smoke unsuspecting TII owners.

 

$50k wow thats a BUNCH of money... to much for me. I am going to try to do it without spending that much money. If possible. I have heard that one main mod is swapping froma 4.10 gear to a 4.30. At lwast for accelleration, top speed is lost but makes the car quicker from the line. I have been talking to people from mazdatrix about getting this project started. Sometime next year I am going to get a rebuild on my engine, so I might do the trans like Evil Aviatar was saying.

Thanks dw89s5 I will try the exedy clutch for my car. I have heard good things about them so I will give it a shot. I think I am going to go for stage 3.

I am going to stick with the n/a driveline and try and find something out about beefier synchros.

 

What kind of lsd is in the stock NA? Your going to want a clutch lsd that locks up real aggresivley. go aftermarket or shim the stock one up for extra aggresive lockup.

 

No it isn't.

On an NA, you'd probably GAIN top speed... but you'd have to deal with revving to 4.5K just to do 80 MPH...

Top speed is only lost if you can top out 5th gear...

 

Like I said, they are nutty. Well, nutty and fast.

It is not possible for an amateur to compete with the professionals, especially with a smaller budget. However, you can still make a pretty nice street NA on a smaller budget.

If you are interested in an even lower gear ratio, talk to Mazdatrix about converting your differential to use the short pinion 4.44, 4.875, or 5.125.

No, the racers usually remove the synchros, and I only mentioned that so you can tell them to retain the synchros if you like them. The "beefier" part is a lot of hand-fitting work on the internals. The race shops have spent many years developing their super-secret process for this modification. You can't do this on your own, there is no way they are going to tell you their secrets, and it is not likely you could do the work even if you knew the secrets. Therefore, you will need to have a race shop perform this work. The good thing is that they don't charge that much.

The speed in each gear would still be 94.7% of the original speed. (4.10 / 4.33 = 0.947).

 

I bet it's funnier watching them being smoked by TII owners who've only spent $20K...

IMO the money to buy the gear and pinion and time to rip the diff apart to fit them isn't justified just to get a 5% difference. Of course if you find a set cheap and the diff has to come out anyway for some other reason, that's different.

Actually for an S4 NA the engine speed at 80mph would increase from 3250prm to 3400rpm. It's very simple math, and the disadvantages are no more impressive than the advantages.