Board logo

Diff Ratio
benners05 - 7/1/14 at 12:41 PM

Hi All

Car is getting close to completion and the final big buy left is a diff.

I think I'm going to put a LSD in it but want to know people thoughts on it.

I'm also wondering on the best ratio.

The car is a Tiger Avon with a 2009 GSXR 1000 in it.

Cheers!

Ben


Wadders - 7/1/14 at 02:20 PM

Suppose a lot depends on intended use, Road or Track

3.38 or 3.14 are ideal, 3.64 is ok but you will probably rev out in top gear on long straights.

Either Tran X or Quaife for the LSD, plenty use the Ford viscous, but having had both Ford then Quaife i would not go back.

Al.


doobrychat - 7/1/14 at 04:48 PM

its a fine balance between getting off the mark and top speed.. i would say that a 3.6 is a happy medium between pulling away and top speed..


sdh2903 - 7/1/14 at 05:58 PM

I have an r1 lump and I use a 3.45 diff (bmw). It's just about right. Decent acceleration and motorways don't make you ears bleed.


ReMan - 7/1/14 at 06:21 PM

I'd start with a nice cheap 3.62 LSD and take it from there.


daniel mason - 7/1/14 at 09:53 PM

id be looking at a 3.38 for sure.


unijacko67 - 7/1/14 at 10:11 PM

I cant see any mention on wheel size?


benners05 - 8/1/14 at 10:28 AM

Thanks for the tips.

Its on 15" wheels with 205/50/15 tyres.

Ben


benners05 - 17/1/14 at 04:35 PM

For anyone interested I did a spreadsheet to work out speeds in gears.

Can be modified easily to suit other engines/ratios

If anyone wants it let me know (either how to attach it to here or I can email it)

Ben


adithorp - 17/1/14 at 04:40 PM

quote:
Originally posted by benners05
For anyone interested I did a spreadsheet to work out speeds in gears.

Can be modified easily to suit other engines/ratios

If anyone wants it let me know (either how to attach it to here or I can email it)

Ben


There's already a calculator spreadsheet in a sticky thread over in the BEC section.