Rear Diff ratio's s14 vs gtir - SR20 Forum
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#1 (permalink) Old 02-27-2006, 08:11 AM
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Rear Diff ratio's s14 vs gtir

Hi

Maybe one of you guys can tell me what the diff ratio is, of a GTir rear diff compared and a s14 rear diff

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Last edited by derm; 02-27-2006 at 08:12 AM.
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#2 (permalink) Old 02-27-2006, 02:04 PM
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Sorry, I don't know, but the diff off the gti-r is a 190mm ring gear diff and a s14 is a 200mm. I think I read this somewhere, but am not sure. Correct me if I am wrong, the s14 uses a r200 diff and the gti-r uses a h190. Don't take my word for it. Do soem research and let us know

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#3 (permalink) Old 02-27-2006, 04:39 PM
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Quote:
Originally Posted by 420sxDET
Sorry, I don't know, but the diff off the gti-r is a 190mm ring gear diff and a s14 is a 200mm. I think I read this somewhere, but am not sure. Correct me if I am wrong, the s14 uses a r200 diff and the gti-r uses a h190. Don't take my word for it. Do soem research and let us know
the gtir diff is 181mm and the s14 is 200mm the ratio on the gtir is 3.7 and the ratio on the r200 is 3.692 good for goverment purposes

Thanx anyway

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#4 (permalink) Old 02-27-2006, 06:42 PM
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The front ratio on the GTi-R is 4.125 so I would think the rear has to be the same , unless they chage it in the transfercase gearing ....I guess it may depend on the years ...

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#5 (permalink) Old 02-27-2006, 06:49 PM
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GTIR has a R180

S14 has a R200, diff ratios are 4.44 and 4.11

You can get a 3.90 diff in a Infiniti J30

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#6 (permalink) Old 02-28-2006, 01:12 AM
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I think that sounds a little better for teh s14 ratio. 3.692 was a little low

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#7 (permalink) Old 02-28-2006, 02:41 AM
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Now I am confused.

What is the stock gtir front diff ratio and the rear diff ratio?

As I had it it was 3.7 front and the same rear

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#8 (permalink) Old 02-28-2006, 09:31 AM
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The GTi-R uses a 3.70 rear diff and 4.125 front diff the transfercase is a reducer. It was done primarily to reduce driveshaft speed.
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#9 (permalink) Old 02-28-2006, 02:35 PM
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Quote:
Originally Posted by turboAZ2
The GTi-R uses a 3.70 rear diff and 4.125 front diff the transfercase is a reducer. It was done primarily to reduce driveshaft speed.

Thanx this make sense.

I tested the front diff and it boils down to 3.7 to 1. That's now through the transfercase.
Now the big question:

If I use the rear diff of the s14 that have a ratio of 3.692
The difference is 0.216%
In other words the rear diff will turn 0.21% faster than the front one. Will this be the end of the world
Will the visco over work?

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#10 (permalink) Old 02-28-2006, 08:00 PM
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Quote:
Originally Posted by derm
Thanx this make sense.

I tested the front diff and it boils down to 3.7 to 1. That's now through the transfercase.
Now the big question:

If I use the rear diff of the s14 that have a ratio of 3.692
The difference is 0.216%
In other words the rear diff will turn 0.21% faster than the front one. Will this be the end of the world
Will the visco over work?
Figure out a tire diameter difference that will make them come out the same ...

SHAWN
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#11 (permalink) Old 02-28-2006, 09:06 PM
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^^^until the tires wear down unevenly, and the angle drive starts spittin oil all over your driveway. if you swap, you hafta swap the front too, to the same front~rear reduction ratio as stock, or you'll just make a big, expensive mess. we had a volvo customer last week that had new tires on the rear, and worn ones on the front, and now he needs a new angle drive. this tells us that even the difference of a few millimeters between the two will do great damage to the mechanical components, such as differentials, transmissions, angle drives/t-cases, and deiveshafts. nissan spent the money on the engineering to make it work. a resource most of us dont have.

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Last edited by BRE92SER; 02-28-2006 at 09:11 PM.
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#12 (permalink) Old 05-22-2006, 09:15 AM
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so does any US nissan rwd rearend match or work with a gti-r tranny or is the gti-r rearend the only one? Does any aftermarket place make gears for the 240 rearend?

http://www.sr20forum.com/members-rides/124356-gti-r-swap-done.html
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Last edited by se200; 05-22-2006 at 09:16 AM.
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#13 (permalink) Old 05-23-2006, 12:16 AM
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Quote:
Originally Posted by Andreas Miko
GTIR has a R180

S14 has a R200, diff ratios are 4.44 and 4.11

You can get a 3.90 diff in a Infiniti J30
S14 has an R200 or R200V

USDM cars have 4.083
JDM has 4.083 (N/a) or 3.692 (Turbo)
EDM has 3.692 (All Turbo)

No such gear as a 4.44 (might be thinking of a 4.36 (S13 Silvia), and the 4.11 is found in the Skylines (ECR33 / BNR32 etc.)

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#14 (permalink) Old 05-23-2006, 12:18 AM
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Quote:
Originally Posted by se200
so does any US nissan rwd rearend match or work with a gti-r tranny or is the gti-r rearend the only one? Does any aftermarket place make gears for the 240 rearend?
Not at the moment. You can always have one made but it isn't cheap.

Besides why are you wanting to run a RWD differential with a GTiR gearbox? Wouldn't it just be easier to find a GTiR part-out?

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#15 (permalink) Old 05-23-2006, 03:12 AM
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No the BNR32 GTS rear diff is higher than 4.11. Been discused many times in the RB fourms.

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#16 (permalink) Old 05-24-2006, 09:24 PM
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Quote:
Originally Posted by Yellow4g63
No the BNR32 GTS rear diff is higher than 4.11. Been discused many times in the RB fourms.
A BNR32 is an R32 GTR... an HCR32 is a GTS-t, two very different cars.

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#17 (permalink) Old 05-24-2006, 10:03 PM
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..............

Quote:
Originally Posted by Nismo_Freak
A BNR32 is an R32 GTR... an HCR32 is a GTS-t, two very different cars.
Opps ment to say HCR32 my jdm is kinda stale.

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#18 (permalink) Old 05-25-2006, 01:36 PM
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Quote:
Originally Posted by BRE92SER
^^^until the tires wear down unevenly, and the angle drive starts spittin oil all over your driveway. if you swap, you hafta swap the front too, to the same front~rear reduction ratio as stock, or you'll just make a big, expensive mess. we had a volvo customer last week that had new tires on the rear, and worn ones on the front, and now he needs a new angle drive. this tells us that even the difference of a few millimeters between the two will do great damage to the mechanical components, such as differentials, transmissions, angle drives/t-cases, and deiveshafts. nissan spent the money on the engineering to make it work. a resource most of us dont have.
Be surprised if you saw that issue with the Nissan diff. The GM sourced differentials have VERY suseptale to tyre wear differances. The Vauxhall(Opel) Calibra my Dad has warns you in the hand book not to have the tyres more than 3mm different for tyre wear front to rear. I believe the Volvos use the same system. This isn't an issue with the GTIR or any other "true" 4WD system I know of.

Mind you I still don't think that I'd change the ratio front to back - what would be the point?
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#19 (permalink) Old 05-25-2006, 08:09 PM
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Quote:
Originally Posted by Yellow4g63
Opps ment to say HCR32 my jdm is kinda stale.
Hehhe... the HCR32 uses a 4.30 or 4.36 gear ratio if I recall correctly.

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Last edited by Nismo_Freak; 05-25-2006 at 08:11 PM.
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#20 (permalink) Old 05-25-2006, 08:16 PM
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yeah I found a gti-r full rearend so I'm just gonna go with it.

http://www.sr20forum.com/showthread.php?t=124356
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