GTM Performance Engineering: MHI Twin Turbo Official Release

phunk

These cars have the crappiest IRS configuration for dealing with high power. If you want to not spin in first and second you have to really dial the power back. If you take it up to over around 550rw, 3rd gear is useless without race compound tires. Factory powerful cars have a more ideal control arm arrangement that doesnt camber in another 3 degrees when you floor it.

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Alstann

I agree - the camber gain on the car is quite high. Of course, we are set with the pickup points we were given, so we gotta deal with it.

I think most of the traction issues can still be solved with a linear, slowed boost ramp-up and proper suspension set-up. Maybe switch the compound in the rear to a Toyo R888 or equivalent? If it were me and it was a drag event, I would even consider a positive camber setup for the rear. But either way, my car is just going to be a 500-550~ whp street car for myself, so it's nothing too competitive.

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esfourteen

R888 made a HUGE difference for me at ~600whp, 2nd hooks much better with a bit of spin up top but never really steps out, 3rd is no longer an issue. I also have a 3.5 FD, quaife LSD, and whiteline diff bushings. the bushings alone almost eliminated wheel hop entirely which makes a huge difference.

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