apsolus

iTrader: (2)

hey i have an 87 base rx7 with a trashed manual transmission. grinds into all gears pops out of gears. the car was originally equipped with an automatic trans that at some point in time was swapped to the manual. anyway i didnt realize this but when i went to bolt the turbo 2 clutch and pressure plate to the N/A flywheel it wouldnt fit, clutch is to big. do i need to just aquire a stock turbo 2 flywheel? if i had the t2 flywheel i could just bolt up the clutch, pressure plate and transmission right?? is the clutch fork interchangable between the two transmissions? and on top of that i still need to make the bracket to hold the tail shaft in properly. any help would be really good!

apsolus

iTrader: (2)

oh and i have a light weight steel flywheel also. should i just try using that with the automatic counterwieght? damn im confused.

joeylyrech

iTrader: (11)

What are you trying 2 do?a turbo fc uses a bigger clutch and plate than a na fc.....also spline count is different so it wont fit a na trans.If you are doing a turbo transmission swap on your na you need....clutch,pressure plate,transmission with cross member and mounts from the same series car,drive shaft,starter and rear end all from a turbo car 2 do it.If you have a turbo aftermarket flywheel you need 2 get a automatic counterweight same series as your motor and bolt in on 2 your flywheel.Use the search fuctions it has been covered hundred of times!Good luck!

KompressorLOgic

iTrader: (6)

Or if you don't want a t2 rear u need a custo. Driveline. Or pay a driveline shop to etend the auto drive line to make it work. auto driveline has large front spline like t2 but small rear end flange like an na. But it is too short by an inch or two

RotaryEvolution

iTrader: (30)

yet another trans swap question.

the answers are out there with a quick search.

you'll need a bit more than just the transmission to make it work..

apsolus

iTrader: (2)

thanks for you input guys.
to clarify, i am installing an s4 turbo transmission into my 87 na because the transmsission thats in it now is shot and the turbo transmission is stronger. car was originally equiped with an automatic. nobody told me this wheni bought the car i just knew it when i got under it and saw the shitty job on the rear transmission mount.

i have all the other stuff like starter, racing beat driveshaft and all that other stuff to make the swap work, my problem was when i tried using the turbo cluch and pressure plate on the na flywheel. but i do have a steel flywheel lying around and auto counterweight. according to atkins rotory the lightweight flywheels still make for a good daily driver, but im leary of this.

so my question is, would yall recommend i just install the aftermarket flywheel and counter wieght? im going to try a test fit and get back to you

RotaryEvolution

iTrader: (30)

the 11lb is being minimum i would recommend for a street driven car. 16lbs being the ideal median for performance and streetability. below 16lbs the car will struggle to gain speed from a dead stop.

i use an 11lb chromoly steel flywheel and it works ok, but i wouldn't say it is a great compromise since i have to feather the clutch to start rolling(granted my car is the lowest compression ratio engine of all rotaries at 8.5:1 with a big thrust bearing turbo slapped on it, which makes it a dog from a dead stop). your 9.4:1 engine should handle it better.

joeylyrech

iTrader: (11)

is your aftermarket flywheel a na or turbo unit?by racing beat drive shaft what do you mean?

Evil Aviator

What do you mean by "racing beat driveshaft?

Also, just to make sure that you know, you will need to use a Turbo II clutch slave cylinder. It looks very similar to the NA slave cylinder, but the mounting holes are in a different location.

The steel flywheel will not work if it is a NA-sized flywheel. The NA flywheel is a smaller diameter and it will not engage the starter mounted to the larger diameter Turbo II bellhousing.

That depends on you. See this link:
Flywheel and Clutch Explanations

RotaryEvolution

iTrader: (30)

i assume he means the mazdatrix modified turbo>n/a driveshaft.

apsolus

iTrader: (2)

sorry yeah i was just throwing names out there. i bought if off someone here local and i cant remember the name brand but yeah, its for the conversion.

i have the turbo slave cylinder as well. my only issue with parts is the transmission mount. im hoping the mout holes that are already ther will work. i was thinking of cutting and welding the original ears off the original automatic crossmember to the new manual trans cross member. good idea?

also i think the flywheel would be the 16 pounder steel one. and it was for the turbo cars. i ended up using it because i couldnt use the stock na flywheel as the clutch would not sit in it and the pressure plate would not bolt up. shouldnt the automatic counterweight combine with the weight of the light flywheel to make it closer to the weight of the stock unit?

really the big question here is what would you all do about the trans mount?

apsolus

iTrader: (2)

thanks i learned alot about the light weight flywheels!

joeylyrech

iTrader: (11)

My car is 1987 SE and when i did the tranny swap i used a turbo jdm s5 tranny and crossmember and eveything bolted right in.For bushings i ordered some ebay solid units and they went on like nothing!I didnt have 2 mess around with nothing,also had a 90 auto vert that we did a s5 na tranny swap and what i did was cutted off the tranny ear mounts from a coupe s5 at the junkyard and welded them 2 the vert chassis,use the s5 na tranny and crossmember and done.

RotaryEvolution

iTrader: (30)

welding the new mount ears on isn't for everyone, it requires pulling the interior carpet and chiseling off the sound mat from above the new mounting position otherwise the tar will **** up the welds or carpet catch on fire if not removed.