I'm sure this has been covered in the past (but can't find really old threads), but I'm trying to find a good ratio combination for a specific purpose.
Basically, I have about 7 5sp transmissions. I've gone through every single one. Each of them have the same 2nd/3rd gear (1.76/1.19), and I've come across a 4.25/4.27/4.40 final drive.
I race on an oval track, and usually run carb'd, turning roughly 8000+rpms. With recent rule changes, I have to find mroe speed. We switch to FI, and notice a ton more acceleration, but have to fight with a low rev limiter. The car Flies off the corner in second, and absolutely sucks in 3rd. So the best scenario I've used is running the FI, and shifting into 3rd halfway down each straight....That is not easy, and even harder, is down shifting and popping the clutch to slow down. 25 lap race = 100 shifts...Any gain you get with the fuel injection, is all lost with 1 single missed or slow shift.
So, basically I have 2 options. I can try and find a much shorter 3rd or final drive, or a taller 2nd/final to jus ttouch the rev limiter at the end of the straight. We hit roughly 70 mph, so I use that as a marker...and that puts us at 7900 rpm with 1.76/4.40, and about 7600 with the 4.27 final. To be around 7000 rpms, I would need a 3.8 final drive (roughly) with some room to still go faster before the limiter.
I've looked into the integra transmissions, and the gearing is better, but unforunately the shafts are different sizes, and it's a different setup, so they are not interchangeable. Which sucks, since all gears changeable on both shafts, where the civic ones you cant change the gears on the input shaft.
Only thing I have come up with, is I've seen some people mention the final drives out of the 2nd gen civics, Does anyone know whether that is possible to change those? I've seen the exploded view of the transmission, and the set inside is idnetical, but those diagrams are always accurate.
And 2nd question, anyone else have any other suggestions? The HF gears are impossible to find, or else I would be having so much trouble.
Edited by kyller, 25 May 2012 - 09:34 AM.