1Jz 240sx Rear End Ratio Advice

[D14]

Originally Posted by Def

Those gears don't look that different from stock SR gears. I think a 3.1x final drive would make the car a complete dog.


...and no way your car weighs 1300 lbs... haha

I agree with Def on all points.

Your gearing is identical to a JZA70 with the exception of final drive, the Supra's have a 4.10, you've got a 4.083. Minute difference. It's not gearing that's limiting you, it's power, revs and tire size. 95% of the "car people" I hang out with are MKIII and MKIV Supra owners, I know from first hand experience that you're not going to get very far with Supras, Vettes or whatever else on a stock twin 1JZ. Put the 17" wheels on (that will net about a 1.25" gain in tire height, slightly lengthening your ratios) and start saving for a single upgrade and supporting mods, your final drive is fine.

And don't switch to a 3.1 final drive, your car will fall flat on it's face, you don't have that kind of torque, it's a 1JZ, not an LS2. If you do decide to switch, don't go lower than 3.692.