30psi
club Member
Posts: 166
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Post by 30psi on Sept 23, 2012 18:49:45 GMT 1
I want more revs out of my slow 910.
Are there any variants of the R160 with high ratios?
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Post by Al Ramone on Sept 23, 2012 18:58:12 GMT 1
do you know what ratio you have? guessing it's something silly like a 4.1 or something?
don't the 610's and 810's use a r160? as well as manual 910's?
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Post by Al Ramone on Sept 23, 2012 19:14:27 GMT 1
ah yes. not much avalible then.
think yours would be a 4.1 and the only other one listed is a 3.9.... not much better aye?
Subaru's use a R160 and R180. i've heard/read they can be swaped into nissan casings, so maybe a much larger choice out there?
maybe better off looking at swaping in a R180 from a manual C210 or early S130. (i don't know the ratios but likely to be better?)
then again you also could go down the R200 route....
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Post by RatDat on Sept 23, 2012 19:36:13 GMT 1
Some Nissan 4x4s use an R160 as a front diff. Ratios unknown though. I have an Imprezza diff built up with a Nissan LSD in it and that's a 3.7. Stock it was a viscous diff but there's no reason you can't swap centres and shove a stock Nissan open carrier into it. Be aware that there are two different bolt sizes on the crown wheels though. Early R160's are smaller bolts. There's also the issue with earlier diffs having bolt in axles and later ones having snap rings.
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30psi
club Member
Posts: 166
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Post by 30psi on Sept 23, 2012 20:37:42 GMT 1
To clarify, I'm after a high numerical number, so would want something like a 4.1 or higher still if that's possible. Mine is an auto diff which I think is 3.9 (need to find the service manual to check).
The other thing I can do is do what the cool retro kids do and fit some undersized wheels and slam it too.
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Post by Talking Hoarse on Sept 24, 2012 13:49:18 GMT 1
I want more revs out of my slow 910. Are there any variants of the R160 with high ratios? Interesting request - as I think my 910 (albeit estate has different axle) needs higher gearing ie less revs. So that puts me off using the more common 65 or less profile tyres instead of 185-70x14's. Easy answer for you - as you pose above - is to use smaller diameter tyres. 65, 60 & 55 profiles are now cheaper & easier to get than 70 profiles. |
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Post by Al Ramone on Sept 24, 2012 19:28:53 GMT 1
ahh...... so a lower ratio  i think the autos use the lower ratio, so you should already have a 4.1. again look at subaru. i've read about 4.4's in them. |
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30psi
club Member
Posts: 166
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Post by 30psi on Sept 24, 2012 19:48:17 GMT 1
It's a higher ratio ;-) More turns of the prop to the output shaft.
I checked the service manual, auto or manual it was a 4.111 but there was a European option of a 4.375 diff for mountainous regions.
I'll look in to Subaru's but I don't want to be doing too much messing around with shafts
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Post by Al Ramone on Sept 24, 2012 20:44:57 GMT 1
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datman
Senior Member
Posts: 799
Location: West Sussex/Surrey
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Post by datman on Sept 25, 2012 16:28:13 GMT 1
as far as i know the 1.8s were 3.9 and the 1.6 was 4.1.
ive often wanted Taller gearing but never the other way.
higher RATIO to me means lower gearing, IE the reduction ratio is higher, and the wheels go slower.
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Post by Talking Hoarse on Sept 30, 2012 11:48:53 GMT 1
as far as i know the 1.8s were 3.9 and the 1.6 was 4.1. ive often wanted Taller gearing but never the other way. higher RATIO to me means lower gearing, IE the reduction ratio is higher, and the wheels go slower. Hah. I get it - so taller = lower! (Taller diff means lower ratio means less revs). Does that also mean I am taller than my sons for once? Must admit that I always thought that a lower diff was for higher revs at a given speed - but I am very much in minority (ie wrong). I agree with Will - I have never had a car where I have seen a need for a higher diff (ie more revs) as I can always change down a cog or 2. I always wanted lower revs (taller diff etc) at 70mph. I know that competition cars are different though. Ed |
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Post by Al Ramone on Sept 30, 2012 12:57:44 GMT 1
no. Will is wrong too.
higher ratio means lower number and taller gearing. more mph per rpm.
lower ratio means higher number and shorter gearing. less mph per rpm.
30psi seams to be after a lower ratio diff for his SR20DE powered 910.
i guess he's after more acceleration rather then a comfortable cruising speed.
better off fitting a DET?
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datman
Senior Member
Posts: 799
Location: West Sussex/Surrey
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Post by datman on Sept 30, 2012 13:30:31 GMT 1
lets agree to disagree .. but to clarify why I think of it the way I do... The final drive is a reduction gearbox. 5:1 is a high ratio if you think about it, the 5 is five times bigger than the 1. Ratio between 1 and 3 (3:1) is surely a lower ratio. (but higher speed as the wheels are going nearer to the engine speed rather than being reduced by the large reduction ratio.
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Post by Al Ramone on Sept 30, 2012 13:38:16 GMT 1
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paranoid
club Member
datsuns and old british cars wanted for breaking
Posts: 152
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Post by paranoid on Nov 16, 2012 23:14:42 GMT 1
if you do 30mph the engine will rev more with a 4.1 diff compared to a 3.9 or 3.7.the higher the ratio more pick up.lower the diff the better fuel economy and crusing revs.putting smaller wheels/tyres would have the same effect as a higher diff
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