I'm very sorry if this has been asked before. I've been looking around the net for specifics and searched this board for weeks couldn't find a thread that gave me enough info. Here is the problem. My friend has a 90 RX7 Turbo II. It blew the rear rotor like they all do. A friend of his(now ex-friend) ripped him off and totally wrecked his turbo. So now my friend needs a complete 13BT with turbo for it. Problem is we can't find any. All we can find are the S4 motors. My question is what are the differences exactly and what has to be done to make it all work with the S5 ECU, wiring etc. I'm ashamed to write this as I pride myself in being able to find any info I need, but I haven't been successful. I am a bigtime rotor-head and know my way around rotaries, but I never owned or messed with Turbo rotaries. Not that I don't like them, just never had the money to get a decent Turbo model. Thanks. Any help will be greatly appreciated.

 

Chris@spdracing has series 5 complete engines, I believe he also has some spare series 5 turbo's.

 

Externally, the front cover on the S5 block is made to use a later model electronic oil metering pump (OMP). You could easily swap out front covers allowing the S4 block to accept the S5 OMP. Everything else is a bolt over swap.

Internally, the S5 blocks have higher compression and lighter weight rotors. Also the irons/plates are stronger, and the timing is a tad more advanced on the S4 rotor housings. Nothing that will effect normal driving conditions.

I'm sure if I'm forgetting something others will jump in and help out.

 

the are very much different. keep looking for an S5 it'll save alot of headaches later

 

Hmmm just remembered the knocksensors in the S5 rotor housings... What other reasons though..? I'd like to know tooo.

 

Do you know how I can reach him? Email address?

 

Hmm.. Turbo, manifold and wastegate are all different... Rotors for s5 are lighter, the rotor housings are different, knock sensor is s5 only...

Man I know there are more things...

Why doesn't he rebuild the S5 he has now and then get a rebuilt turbo? Hell go hybrid with say a T04 wheel and stock hotside? I see those for around 500.00 all day long..

 

pretty much every single part both inside and bolted to the engine is different from S4 to S5. some are swapable. some are not.

 

Well he knows nothing of rotaries, and I never messed with turbo rotaries.....

 

If the turbo is the only thing that's broken besides the rear rotor you can have it rebuilt.. there is a guy a lot of 7club guys used but I don't remember who it was.. www.cheapturbos.com are supposed to be good or you can search for the other guy on here. Or you can just buy a turbo from them.

Kevin Landers isn't THAT far away from MA.. he's in TN http://www.rotaryresurrection.com and he can rebuild that motor for you guys for around $1300.00. Sorry I'm not really framiliar with the East Coast having left Cali past Nevada or Mexico once or twice in my life so I don't know if there is a shop that's closer to you.

If you are just looking for a used motor to drop in.. that's not usualy the best thing to do.. my buddy got two s5 TII motors used and both were bad.. not only were they blown but the housings were out of spec too. I've heard many a similar story because a lot of these motors have been abused and die around 100K anyway.

 

Well the problem is....A "friend" who is knowledgable about rotaries, and has, well had a shop, offered to rebuild the motor. He took my friends complete engine, and "rebuilt it". Charged my friend $1700. My friend got a bunch of lies, a pile of used rotors, housings, misc engine parts and a purposely destroyed turbo. His story was he rebuilt the motor, installed it in the car and a faulty turbo destroyed the engine. He then supposedly took the engine apart to rebuild it, and had the audacity to demand more money for all the extra "work" he did. I saw the turbo before the "friend" worked on the motor. It was perfect. When it was returned it looked exactly like somebody had jammed a big screwdriver and banged and smashed the turbine impellers to ****. I feel bad because I didn't offer to help my friend when he came to me and he trusted this jackass. So in the end he needs a complete engine, this one is totaly useless. I don't even think he has the original 4-port turbo housings. I know he still has the correct front cover, intercooler and manifolds. Legal action is pending(you know how that goes). So in the meantime he'll fork over the money so he can enjoy his Turbo II, and sweet rotary bliss. It sucks...the car is an awesome, otherwise mint Turbo II. Very nice. So that's the deal. Thanks for all your help.

 

So what's not swappable..?

 

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Yo, listen... If you pick up a S4 block, I'm sayin' just a BLOCK... and you put it in your S5... and utilize the S5 components... Everything dimension wise will fit. The exhaust manifold, the lower intake manifold, the turbo and it's coolant & oil lines, oil cooler, transmission, flywheel, clutch, fuel lines and injectors... EVERYTHING will fit, EXCEPT the front cover. You have to change the S4 front cover to the S5 front cover in order to accept the S5 electronic OMP. AND... you would have to figure out how to hookup the knock sensors. The S5 rotor housings have threaded holes above the trailing sparkplugs to accept the knock sensors that the S4 rotor housings do not have. On the S4 block, the knock sensor is located on the middle iron/plate right next to the oill fill tube. I'm SURE there has to be a way to get it to work. I didn't have to figure this out only because when I used a S4T block w/S5 components I didn't use the stock harness and stock EFI... instead I went blowthru Weber... but I did use a S5 turbo, S5 exhaust manifold, S5 lower intake, etc..

So again, I'm asking if there's any OTHER reasons to let this guy know cause it looks like he wants to get his friends car running and I'd like know myself.

 

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where is icemark on this one? I'm sure he has a link to a post or faq that goes over all this already.

 

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