J30 LSD Ratio v.s S13 Ratio - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nevaland9 · 07-06-2005, 04:22 AM

i have a 91' 240sx fastback. it has a infiniti J30 lsd and it dosnt feel that fast, i dont know if its the car or the ratio is to tall for my basicly stock engine.

Can someone get the the ratios for the J30 LSD and the ratio for the stock open diff? or give me a explination. im pretty sure the j30s ratiso are taller but i would like to know exact number and if i should switch over the stock ring and pinion (if possible)

thank you,
Jason

orion::S14 · 07-06-2005, 06:26 AM

TONE DOWN THE BIG LETTERS AND BOLD TEXT...damn.

And [search + J30 + gear ratio] would give you a quick answer.

...or see here: www.KA24DEvelopment.com/vlsd.html

- Brian

BrandC · 07-07-2005, 12:24 AM

The website says the stock open diff is only 4% taller, so it shouldn't matter. It's like changing tire sizes.

dct223 · 07-07-2005, 12:33 AM

why is ur font so damn big..

anyways J30 final drive is 3.9 on the ring gear its stamped 47:12.. 47/12 = 3.916666666666

crack open ur open diff and look at what is stamped on the big ring gear, and then do the math urself... not that hard...

drift freaq · 07-07-2005, 12:34 AM

plain and simple the info is right here on Zilvia if you used the search button. Oh and that website has it backwards taller gears mean lower numbers which translate to higher top speed hence taller and slower off the line acceleration. shorter gears are higher numbers which translate to lower top speed but quicker off the line acceleration response.

Ritz S14 · 07-07-2005, 12:35 AM

Did you loose your opitcals or something?

Davis, look who's talkin. Go crack open your vlsd!!

orion::S14 · 07-07-2005, 07:03 AM

Quote:

Originally Posted by drift freaq

...Oh and that website has it backwards taller gears mean lower numbers ... shorter gears are higher numbers ...

Where? The only spot I mention taller gears is:

Quote:

Originally Posted by www.KA24DEvelopment.com

J30 diffs have a 3.916 ratio, which is 4% taller than the stock open differential...

Is that what you were reffering too, or am I missing something? Let me know, I don't want bad info on my site...

- Brian

07-06-2005, 04:22 AM	#1
nevaland9 Zilvia FREAK! Join Date: Sep 2004 Location: Long Island, New York/Toronto, Canada Posts: 1,251 Trader Rating: (0) Rides Gallery: nevaland9 Feedback Score: 0 reviews	J30 LSD Ratio v.s S13 Ratio i have a 91' 240sx fastback. it has a infiniti J30 lsd and it dosnt feel that fast, i dont know if its the car or the ratio is to tall for my basicly stock engine. Can someone get the the ratios for the J30 LSD and the ratio for the stock open diff? or give me a explination. im pretty sure the j30s ratiso are taller but i would like to know exact number and if i should switch over the stock ring and pinion (if possible) thank you, Jason

07-06-2005, 06:26 AM	#2
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	TONE DOWN THE BIG LETTERS AND BOLD TEXT...damn. And [search + J30 + gear ratio] would give you a quick answer. ...or see here: www.KA24DEvelopment.com/vlsd.html - Brian __________________ www.KA24DEvelopment.com

07-07-2005, 12:33 AM	#4
dct223 Nissanaholic! Join Date: Nov 2003 Location: hella NORCAL! Age: 39 Posts: 1,664 Trader Rating: (4) Feedback Score: 4 reviews	why is ur font so damn big.. anyways J30 final drive is 3.9 on the ring gear its stamped 47:12.. 47/12 = 3.916666666666 crack open ur open diff and look at what is stamped on the big ring gear, and then do the math urself... not that hard... __________________ Sfourteen

07-07-2005, 12:34 AM	#5
drift freaq R.I.P. Aya, always love Join Date: Nov 2001 Location: Los Feliz/Hollywood Posts: 18,564 Trader Rating: (215) Rides Gallery: drift freaq Feedback Score: 215 reviews	plain and simple the info is right here on Zilvia if you used the search button. Oh and that website has it backwards taller gears mean lower numbers which translate to higher top speed hence taller and slower off the line acceleration. shorter gears are higher numbers which translate to lower top speed but quicker off the line acceleration response. __________________ "Having a lot of tracks on a song is like putting stickers on a car to get more horsepower" New Video https://www.youtube.com/watch?v=uebV1OnbRsw Buy my mounts! http://zilvia.net/f/sale-items/51531...ns-mounts.html http://zilvia.net/f/tech-talk/317539...e-mouts-6.html

07-07-2005, 12:24 AM	#3
BrandC Join Date: May 2005 Location: San Mateo, CA Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	The website says the stock open diff is only 4% taller, so it shouldn't matter. It's like changing tire sizes.

07-07-2005, 12:35 AM	#6
Ritz S14 Post Whore! Join Date: Jul 2004 Location: C A L I F O R N I A Age: 43 Posts: 3,586 Trader Rating: (0) Feedback Score: 0 reviews	Did you loose your opitcals or something? Davis, look who's talkin. Go crack open your vlsd!!