Dak

I just picked up a S5 jspec engine from a guy who bought someone's failed S4 to S5 TII conversion. Has I think a stuck seal on the front rotor and I think blown coolant seal cause nasty coolant came out of the front rotors spark plug holes, so he's going V8 and I bought the rotary for the turbo parts. Anyway upon looking at the T.B. it has a tps with a single plunger and no cam for the second plunger. My initial thought was that it has aS4 T.B. on it. Is this correct or was the JSPEC S5 use a different T.B. and TPS? I was under the impression they were the same.

A second question. If it is a S4 T.B. can I still modify it to us the FD TPS like some people have done on their S5 T.B.? Thanks.

Pete_89T2

iTrader: (4)

Within series (S4 or S5) and within type (NA or turbo), the JDM and USDM throttle bodies & TPS sensors are essentially the same, with a few minor differences. I have a spare S5T2 JDM throttle body and my USDM TPS sensor bolted right up to it. Only difference I recall on the JDM TB is that it has a spring loaded adjust screw for the base idle/throttle stop adjustment (just like the TPS adjust screw), while the USDM TB uses a set screw & jam nut for that. So the one you got must be an S4 TB.

Dak

Thanks. I had a feeling it was a s4. Add that to the list of things the person that started the conversion did that makes no sense. At this point if my S5 N/A TB and TPS can't be made to work it would probably be cheaper to convert to the FD UIM and TB. It would look and function better anyway.

DR_Knight

iTrader: (23)

Yes, the tps you have is a s4. If the s5 engine is going in a s4 car, it is wise to use s4 throttle body and electronics on the s4 car. Much easier than wiring the s5 harness to a s4 car. I ran the same setup.

Dak

Therein lies the problem. It will now be going back into a S5. The confusing part is the original owner( not who I bought it from) was trying to transfer all the S5 wiring from a JDM front clip into the S4 shell and run it with a N374 ECU, so he needed the S5 TPS anyway.