zoneman2

iTrader: (8)

I have a question guys, Is there a big difference between a J-spec rx7 engine and a US spec rx7 engine? If so can you list it plz? thanks

zoneman2

iTrader: (8)

nvm, i searched more n found the answer. Tho i haven't found 1 for this. If my engines j-spec and i have a a-spec ecu im gonna have issues right?

Sketch_hs

If you swap over the sensors and other electronics there shouldn't be any problems or issues.

rx-711

iTrader: (2)

you just need a usdm wiring harness

RotaryRocket88

iTrader: (7)

The sensors are all exactly the same. A jspec harness could be used, but it's too short anyway. The original NA us-spec engine management harness should be kept for all turbo swaps regardless of where the engine came from.

dennis blackstone

the intake plenum is differant on the s4 it has no idle stop screw and few other little things (t2)

zoneman2

iTrader: (8)

i got a tII A-spec wiring harness, everything have is a spec but the engine is j-spec

Fc3sFREAK415

how so?

RotaryRocket88

iTrader: (7)

How so to which statement? Using the NA EM harness? There are many threads on this, including this one: https://www.rx7club.com/2nd-gen-archive-72/s4-na-turbo-swap-details-813825/