I can probably get by with the factory limited slip. Any extras out there?
Steve
I can probably get by with the factory limited slip. Any extras out there?
Steve
Steve,
As you have probably figured out, the 4.33's are pretty rare. If you are looking for a plate type limited slip to use for competition, look for one from an 86-88 GXL. IIRC, they all had ltd slip diff's. The gearing won't be optimal, but neither is the 4.33.
If you haven't already, check www.rx7club.com. The classifieds there are pretty extensive.
Jim Cohen
ITS 66
CFR
The closest you might come to a cheap, available unit might be a 4.10 from an automatic. The next best thing would be a 4.30 from a GTUs. More rare, and more expensive. The manual trans cars came with a 3.90 almost exclusively, I think.
Chris Wire
Team Wire Racing ITS #35
www.themotorsportshour.com
"Road Racing on the Radio"
WPRK 91.5 FM
wprkdj.org
"Tolerance is the last virtue of a degenerating society" - Unknown
I've converted to EP and I'm using a dog ring box with a 1:1 final drive. My 5.12 will not cut it for the longer tracks like Road America. I ended up getting the 4.33 ring and pinion from Mazdaspeed and am calling Mazdatrix for a Kaaz 1.5. I'll use my parts car for the housing.
Take care and thanks for your help.
Steve Smyczek
Chris Wire
Team Wire Racing ITS #35
www.themotorsportshour.com
"Road Racing on the Radio"
WPRK 91.5 FM
wprkdj.org
"Tolerance is the last virtue of a degenerating society" - Unknown
No performance numbers, since my car went through some other significant mods at the same time as the 4.10 -> 5.12 change. However, it changes your 2-3-4 shifts into 3-4-5 shifts. You need the close ratio transmission with the 5.12. I haven't done the math to decide if 2-3-4 with the 4.10 is better/worse than 3-4-5 with the 5.12. Might be track-dependent. I do know I don't like the shift to/from 5th.
Marty Doane
ITS RX-7 #13 (sold)
2016 Winnebago Journey (home)
The .756 5th gear is preferred over the standard .697 or .711 - the .756 is only found in the GTUs (not to be confused with the GTU) which are very rare, in most cases you need to get the .756 from Mazdaspeed and have 5th gear replaced when doing the rebuild. Not sure what you have, but this may help the problem.
Of course there are the Miata tranny gears, but NOT LEGAL for IT.
Mark B. - Dallas, TX
#76 RX-7 2nd Gen
SCCA EP
Former ITS, ITE, NASA PT
Do you still have the 5.13?
matt
Chris Wire
Team Wire Racing ITS #35
www.themotorsportshour.com
"Road Racing on the Radio"
WPRK 91.5 FM
wprkdj.org
"Tolerance is the last virtue of a degenerating society" - Unknown
Lots of really cool and FREE racing calculators here... http://www.wallaceracing.com/Calculators.htm
Mark B. - Dallas, TX
#76 RX-7 2nd Gen
SCCA EP
Former ITS, ITE, NASA PT
the 5.12 is the best all-around gear for 2nd gen (its) rx-7s. you can find another gear combo for each track , that will help you be quicker . the 5.12 is the best all-around pick!
Hi Marty, I knew you wouldnot be selling yours, the question was for Steve(newbie)
matt miller
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