1990 rx7 motor swap
03-13-17, 10:01 AM
#1
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1990 rx7 motor swap
So I need help, I have a series 5 shell. That's the car I plan to use, it's a 1990 rx7 convertible. I bought a series 4 motor running from an 88 convertible. I just need to know if I can use to series 4 ecu and wiring harness to do the swap. Or do I need to get series 5 wiring harness and ecu?
03-13-17, 11:15 AM
#3
Correct, you will need to reuse all your intakes, exhaust manifold, throttle body, wiring, and ecu.
However, I am a little unsure as to how well the s5 ecu is going to run the engine as the compression ratio differs between the two. I imagine it'd be fine.
It'd be a good idea to search next time, before you buy an engine from a different series... To know more accurately what you're in for.
Also curious... The higher compression and lighter rotors in the s5 engines allows for that higher recline. So if you're using an s4 engine with s5 long block components, I'd hazard a guess that you would not necessarily want to Rev it that extra grand.
However, I am a little unsure as to how well the s5 ecu is going to run the engine as the compression ratio differs between the two. I imagine it'd be fine.
It'd be a good idea to search next time, before you buy an engine from a different series... To know more accurately what you're in for.
Also curious... The higher compression and lighter rotors in the s5 engines allows for that higher recline. So if you're using an s4 engine with s5 long block components, I'd hazard a guess that you would not necessarily want to Rev it that extra grand.
Last edited by Acesanugal; 03-13-17 at 11:17 AM.
03-13-17, 11:30 AM
#4
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I mostly just wanna have the car as a nice cruiser. Nothing crazy. So I should just try and hook the s4 harness and ecu to the s5 shell and see what happens?
03-13-17, 12:35 PM
#7
Read my first post again...
You would need to use your s5 ecu and wiring harness, and bolt all of your current s5 intakes, throttle body, exhaust manifold, front cover, etc.. And that is with no guarantee that the ecu will safely or properly run the s4 engine.
You need to do your research.. Searching is your best friend if you are new to these cars, which it seems apparent to me that you are. It's fine, but almost any question you have has been answered a million times before.. You just have to find them.
Before purchasing another engine, you should have already armed yourself with the basic differences between the series engines.. For example, all the manifolds are different, the front cover and oil metering pump are different, engine and ecu are different, etc.
You would need to use your s5 ecu and wiring harness, and bolt all of your current s5 intakes, throttle body, exhaust manifold, front cover, etc.. And that is with no guarantee that the ecu will safely or properly run the s4 engine.
You need to do your research.. Searching is your best friend if you are new to these cars, which it seems apparent to me that you are. It's fine, but almost any question you have has been answered a million times before.. You just have to find them.
Before purchasing another engine, you should have already armed yourself with the basic differences between the series engines.. For example, all the manifolds are different, the front cover and oil metering pump are different, engine and ecu are different, etc.
Last edited by Acesanugal; 03-13-17 at 12:58 PM.
