It's been way too long since my last update, certainly not due to a lack of stuff happening with the car, but because I was waiting for the E85 tune to be finished on the new 5S-GTE setup, which finally happened today!
About 3 months ago, 'Just Engine Management' (JEM) did the 98 RON gasoline tune and everything went perfectly, but we had an issue which delayed the completion of the E85 tune until my return to JEM today. Now that it's all done, I couldn't be happier with how it went!
Note that the turbo is still the same GTX3076R with the same 0.82 A/R exhaust housing.
418rwkw at 32psi of boost on E85:
289rwkw at 20psi of boost on 98 RON gasoline:
Same as above, but overlaid with the result which was previously achieved on the 2.0L 3S-GTE setup at 24psi on 98 RON gasoline, compared to the new 2.2L 5S-GTE setup at 20psi with the same turbo:
I don't have an overlay of the old and new E85 dyno plots, but with the same turbo the peak power is up by 8% and the peak torque is up by 15%! The gasoline dyno plot shows the improved response too.
As mentioned at the start of this post, we had an issue which delayed the E85 tune until today. Everything pointed to it being a spark breakdown issue, so we installed a new Nissan R35 GTR COP ignition system to replace the 1ZZ COP setup. As it turned out, the issue wasn't spark breakdown at all (it was an ECU firmware bug), so the GTR coils made no difference haha, but they're probably the best coil-on-plugs that you can get so I'm really happy to have them anyway. Plus we improved the wiring for the ignition system in the process. I think I might be the first person to ever install GTR coils in an MR2, but I'm not sure. The mounting tabs on the GTR coils are at a different angle and radius to the 1ZZ coils, so I modified the existing RacerX mounting plate from the 1ZZ coils, and kept the rubber discs from the 1ZZ coils to help keep water out of the plug wells. I also had to make a little mounting thing for the cylinder 1 coil, because the raised parts of the gen 2 cam cover prevent any other solution.
I also installed one of the amazing Injector Dynamics IDF750 fuel filters:
Lastly, here's a great photo from Toyotafest a few months ago: