TII swap questions
 

I posted this over on m.net but have gotten no response. I'm doing a TII swap in my miata and have been following crash's site, but I am confused about what to do with the throwout bearing/clutch fork/slave cylinder bit. How do I accomodate the extra 1/2" from the plate?

I welded a ring onto the release bearing. Most hated the way I did it, but it worked on my setup. Too bad I sold it when I got rid of my 1990 Miata!

release = throwout?
I'd modify the fork. I think that'd be the simple solution since it's. I extended my slave rod after seeing the length of B2000 rod with my trans mod/swap - but that doesn't take into consideration the lever arrangement and probably has increased pedal effort and stress on components. That said, nothing has failed with over 1k miles on it.

so if I more or less "block" out the fork a 1/2" that is all i would have to do? Or would I still need to shorten the slave cylinder 1/2".

mscupcar, was lengthening the slave the only thing you did? That seems much easier to me

I should have posted here first, 2 great responses in about 15 min:)

that's all I did, but y8s just replied in another thread that he thinks he killed is twin disk setup by overstroking the diaphragm springs. That might be more of an issue with the tiny (relatively speaking) springs on the twin disk. If you're pedal is adjusted in the middle and the line free of air, I don't see why you can't lengthen the rod until the t/o bearing is just in front of the springs. The B2000 rod was about 40% longer than the Miata's. I'm using a B2000 bellhousing on a Miata center section as an interim solution for my engine swap. I've got the B2000 t/o bearing, fork, slave rod and a Miata slave. Just took some time to get the rod the right length.

excellent, if I have any more questions I'll be sure to check here first, thanks again

Is there a company other than Mazsport that offers custom TII axles for the miata? I'm not really looking to go the modified hub route. I know Racing Mazda used to...

I just got this from a friend (sent to him) and found it interesting. It's a perfect solution IMO.

...I swapped the TII rear into a 93 miata a few years ago. The hardest part was getting/making correct halfshafts. In the end I was able to get ones made from off the shelf parts by raxles.com in Gainsville, Florida. He used 323GTX outer joints with a shaft from some mitsubishi(sorry don't remember the model) then with TII inners. I think it was ~$400 for the two axles. They just slid right into place perfectly with no problems. Thought the info might be helpful to someone else down the line.

hmmm raxles is a great company (used to have a DSM) I will have to give them a call. Mazsport wanted like 700 for a pair of axles.


Another question, can I use a miata throwout bearing, or do I need the rx-7 one? I have a brand new miata TOB, so I was just curious...

My guess is it will have to be rx7 given the size of the input shaft sleeve. If it will, then you have to make sure the inner pp ring will span the "bore" on the pp diaphragm springs.

That's what I thought too. Just wanted a second opinion. I'm bringing the car up to my buddy's garage (he's a master fabricator) to start work on the rear tranny mount and also for the foward mount for the TII diff mount. I'll let you know how I make out.

Excellent - give this thread some pics on the trans and diff swap! :bigtu:

I know it is probobly a long shot, but is there any chance at all you could find out the part numbers and or lengths of the parts for me? I called Raxles and Marty said he remembers doing it and would be happy to do it again, but would need to know all the information again as he didn't hang onto it. Also, are the TII shafts the same length? If so, couldn't I just have him put on a miata outer joint to the TII axle?

I will do, I have a build thread over on m.net and clubroadster, but i can transfer some stuff to here too.

I just uploaded my build thread over here, I got the TII tranny brackets all done, pics and a write up can be found here:

https://www.miataturbo.net/forum/sho...d=1#post235793

bump from the dead, still looking for ideas on how to go about setting this up.

MM- tried to convey the idea via illustration. Four image below are as follows:

1- stock orientation
2- adapter plate installed leaves 1/2" gap from Tob mating surface to pp spring
3- compensation made with fork mod to move Tob connection point 1/2" forward. This should put the stress at your point on the mod and keep everything else the same. How you approach this is up to you. :D
4- Slave rod extension. What I did for a similar result (for different reasons), but it definitely should increase stress on the system components, like the fork and pivot point.

http://i158.photobucket.com/albums/t...tchforkmod.jpg

That's why I learned to post technical questions here and ask which is the better air freshener over there.

BTW, did you know that hanging a "pine tree" air freshener on the mirror in an NC is considered a "mod"?:giggle: It lets you have that "top down country driving experience" even in the city.:)

Thank you so much, that was just what I was looking for.

Glad to help. I need to fly you down so you can put a TII driveline in my car now. :D

Fortunately for this forum, nobody is afraid to blast somebody for what they think is wrong. Whether are or not, it ultimately leads to the right answer(s). :bigtu:

If you're in the area, I'd be more than happy to help you out with the swap!

OK a few more questions. I modified the clutch fork successfully, but I left the camera up at the garage, so pics will have to wait until I get back up there.

These questions are all related to wiring up the tranny. Can I reuse the miata speedo cable, or do I need an rx7 one? Does anyone know what connectors are on the rx7 tranny (reverse light, etc.)? Are they the same as the miata, or are they switched around? I've been poking around on the rx7 forum looking for information, but thought I would post here as I have had great results in the past.

I just found the service manual for it, so I will give that a whirl. For anyone else interested I found it here...

http://www.rx7club.com/forumdisplay.php?f=17

bump, still would like to know about the miata speedo cable

Well I'm stumped again. I took apart the rx7 speedo connector and put in the miata cable, so that is all set. I was able to swap over the miata reverse light switch, no problem there. My question is with the reverse light switch. Now the miata has only a reverse light switch, with 2 wires coming off it. I can't swap it to the tII tranny as the switches are different. The TII switch however is called out in the wiring diagram as a 5th gear/ reverse light switch, with 4 wires coming off it. 2 have the connections for the miata reverse light harness, but the other 2 wires, i don't know. I've never even heard of a 5th gear switch. Would I be able to just use the reverse light wires and leave the others open? Here's a picture of the TII switch:

Attachment 211032

:confused: did you mean swap over the miata neutral...?

Reference the wiring diagram, hook up some voltage and meter and move the shifter around to see what happens in comparison to what the Miata trans does...?

Yes I did, whoops.

Bringing this back from the dead. Did you ever get the Reverse light switch issue sorted out? im going to be running into this in the very near future.

Yeah, I had the wrong wires hooked up to the miata harness. With that said, I haven't run the car yet, so I'm not sure if they work. in theory, everything should be all set.