2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

s5 keg into s4 drivetrain

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Old 01-12-12 | 07:05 PM
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s5 keg into s4 drivetrain

Just a quick question I know I have to change a few things to make it run correctly, I just want to double check what I belive its just the front counterweight and flywheel or is there more that im missing? Id search but im on my phone and it gives me a error when I use the search function.
Old 01-12-12 | 07:27 PM
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The front counter weight and the flywheel have to match the series of your rotors:
S5 rotors = S5 flywheel/counterweight.

The flywheel must also match your transmission [NA or Turbo]
Old 01-12-12 | 07:31 PM
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Ah ok so i just need to grab a tranny.
Old 01-13-12 | 01:50 PM
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then you need to block off your omp of find a s4 one. and make sure you use low impedance injectors not the high impedance that come with an s5
Old 01-13-12 | 03:04 PM
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Originally Posted by DRFT_HRD
Ah ok so i just need to grab a tranny.
Only if you are changing from non-turbo to turbo. S4/S5 Transmissions are interchangeable. NA/Turbo transmissions are not. As Derekcat pointed out above.
Old 01-13-12 | 03:13 PM
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Originally Posted by barnett87rx7
then you need to block off your omp of find a s4 one. and make sure you use low impedance injectors not the high impedance that come with an s5
That depends highly upon the wiring harness/year of the car. The later S4's had high impedance injectors as well. If you've got a resistor pack, then use lows, otherwise, use highs.
Old 01-13-12 | 09:39 PM
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i have highs now and it has a s4 turbo swap in in it just a blown motor, so if i pick up a s5 keg as long as i have the flywheel (i will be running premix) i can just swap it in correct?
Old 01-14-12 | 03:31 PM
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Originally Posted by SonicRaT
That depends highly upon the wiring harness/year of the car. The later S4's had high impedance injectors as well. If you've got a resistor pack, then use lows, otherwise, use highs.
thats right my bad
Old 01-15-12 | 04:15 PM
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Im just trying to be.
Old 01-15-12 | 04:16 PM
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Originally Posted by DRFT_HRD
Im just trying to be.
Im just trying to be clear. (Stupid phone.)
Old 01-17-12 | 01:54 PM
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any feedback i dont wanna assume and be up **** creek.
Old 01-17-12 | 06:10 PM
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Originally Posted by DRFT_HRD
i have highs now and it has a s4 turbo swap in in it just a blown motor, so if i pick up a s5 keg as long as i have the flywheel (i will be running premix) i can just swap it in correct?
Yes as long as the flywheel is an s5 and you run premix n block off the omp and your injectors match your harness you should be good
Old 05-01-23 | 12:51 AM
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Question about everything

Hey so to start off I have a rx7 fc 1988 has a 13b s4 in it right now but one of the rotors lost compression and so I found a S5 keg for cheap he has the flywheel also but he says it needs to be resurfaced but I’m okay with fixing that up just wondering what I need to look at for the injector part also I already premix so where would I look for the plug for the omp.
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