1Jz 240sx Rear End Ratio Advice - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

D14 · 11-24-2008, 10:35 PM

I think he's just trying to making highway pulls and wants longer gears so he can keep up with Supras or whatever else he's running (Vettes?).

With R154 gearing, the 240SX's stock 4.083 final drive, the 1JZ's 7000 RPM stock redline and a 265/35/18 rear tire (unlikely but for shits and giggles we'll use it) he's hitting 130ish in 4th, shifting to 5th and getting a big drop in revs. At the top of 5th he would see something like 171 mph but it's going to take a while to get there.

If he switched to the S15 ring and pinion it would drop his final drive to 3.692, he'd see a little over 140 in 4th and just under 190 mph in 5th. He's still got that drop in revs and he's still going to take a while to get there but it would put his potential top speed within range of a small single or BPU++++ MKIV Supra.

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11-24-2008, 10:35 PM	#13
D14 Leaky Injector Join Date: Jun 2007 Location: Dallas, TX Posts: 79 Trader Rating: (0) Feedback Score: 0 reviews	I think he's just trying to making highway pulls and wants longer gears so he can keep up with Supras or whatever else he's running (Vettes?). With R154 gearing, the 240SX's stock 4.083 final drive, the 1JZ's 7000 RPM stock redline and a 265/35/18 rear tire (unlikely but for shits and giggles we'll use it) he's hitting 130ish in 4th, shifting to 5th and getting a big drop in revs. At the top of 5th he would see something like 171 mph but it's going to take a while to get there. If he switched to the S15 ring and pinion it would drop his final drive to 3.692, he'd see a little over 140 in 4th and just under 190 mph in 5th. He's still got that drop in revs and he's still going to take a while to get there but it would put his potential top speed within range of a small single or BPU++++ MKIV Supra.