I have an 86 GXL. Want to turbo it and was wondering if there was a difference between 86-92. I've been seaching around for a manifold and they all say 87 and up. I know that the 2mm seals is has wont be able to handle alot of boost. I plan on rebuilding the motor... again... to handle more boost next year. I have the resources fo build the rest just wondering if there is a difference on the manidfold. Thanks.

 

There is a difference between those 86-88 is S4 and 89-92 is S5 and 87 is the first year that they made t2.87-92 are all the same iirc.And if you do turbo your NA there is a write up on it on many forums be carefull na turbo hope this helps abit



P.s. If I am wrong about anything please someone correct me thanks

 

Stock 2mm seals can handle a good amount of power. It all comes down to tuning. Are you looking at stock RX-7 manifolds or aftermarket manifolds? If youre looking at stock Mazda ones, 87-88 manifolds are different from 89-92 manifolds. The turbos are also different between series 4 (87-88) and series 5 (89-92) RX-7s. Aftermarket manifolds fit all RX-7s.

 

thanks I guess I dont know crap about t2 Ill stick to my na

 

2mm seals dont hold any better than 3mm seals, 3mm seals are for worn housings IIRC.

 

3mm seals are used when the seal slots in the rotor are no longer within spec for 2mm seals. The groove gets machined to accept 3mm seals after that. Which is better between these two? Thats a touchy subject but without proper tuning, both can be just as shitty or just as good. Do a search and you'll find many discussions on this subject.

 

There is a tun of fitment issues doing this. It is not bolt on www.1300cc.com

 

Thanks for the info guys. I'm just starting to get into these cars. so I'm slowly learning the differences. Now I just gotta get the car running. Turns over but doesnt fire... but its getting fuel and spark.