SR 5th gear ratio?? .838 or .759 ????? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Paul2x · 11-24-2008, 08:53 AM

I've searched and i get both answers.

5th = .838 or .759

Can anyone confirm, what the 5 gear ratio of of a 5-speed SR box is???

Thanks,

-Paul

g6civcx · 11-24-2008, 09:10 AM

The only sure way to know is to open up the gearbox.

Otherwise, you can approximate with calculation. Pick a pace car, radar, GPS, or whatever you want and measure your speed, say 60MPH. The faster you go the more accurate the calculation will be, but use common sense and don't speed.

Then read off your RPM in 5th gear. Don't trust the stock tach. You need something more accurate.

The rounding error on the stock tach can mess up your calculation.

Come back with your speed, RPM in 5th gear at that speed, and your tyre size.

Sileighty_85 · 11-24-2008, 09:44 AM

S14 SR FSM says .838

Paul2x · 11-24-2008, 07:10 PM

Quote:

Originally Posted by g6civcx

The only sure way to know is to open up the gearbox.

Otherwise, you can approximate with calculation. Pick a pace car, radar, GPS, or whatever you want and measure your speed, say 60MPH. The faster you go the more accurate the calculation will be, but use common sense and don't speed.

Then read off your RPM in 5th gear. Don't trust the stock tach. You need something more accurate.

The rounding error on the stock tach can mess up your calculation.

Come back with your speed, RPM in 5th gear at that speed, and your tyre size.

Too much work. =)

Paul2x · 11-24-2008, 07:11 PM

Quote:

Originally Posted by Sileighty_85

S14 SR FSM says .838

OS Giken's site says .759.....humm....lol

anyone??

g6civcx · 11-24-2008, 08:58 PM

Quote:

Originally Posted by Paul2x

Too much work. =)

Then you deserve exactly what you get.

Paul2x · 11-24-2008, 11:04 PM

Quote:

Originally Posted by g6civcx

Then you deserve exactly what you get.

It's an easy answer. Just the fact's. Thats all i'm looking for. This aint Myth Busters. =)

11-24-2008, 08:53 AM	#1
Paul2x Zilvia Addict Join Date: Feb 2005 Location: SoCal Posts: 693 Trader Rating: (0) Feedback Score: 0 reviews	SR 5th gear ratio?? .838 or .759 ????? I've searched and i get both answers. 5th = .838 or .759 Can anyone confirm, what the 5 gear ratio of of a 5-speed SR box is??? Thanks, -Paul __________________ Professional Driver/ Instructor for Hire

11-24-2008, 09:44 AM	#3
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	S14 SR FSM says .838 __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

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11-24-2008, 09:10 AM	#2
g6civcx Post Whore! Join Date: Apr 2004 Location: Virginia, USA Posts: 5,764 Trader Rating: (5) Feedback Score: 5 reviews	The only sure way to know is to open up the gearbox. Otherwise, you can approximate with calculation. Pick a pace car, radar, GPS, or whatever you want and measure your speed, say 60MPH. The faster you go the more accurate the calculation will be, but use common sense and don't speed. Then read off your RPM in 5th gear. Don't trust the stock tach. You need something more accurate. The rounding error on the stock tach can mess up your calculation. Come back with your speed, RPM in 5th gear at that speed, and your tyre size.