Board logo

locost r1 what diff
tjoh84 - 23/9/08 at 08:20 PM

sorry if i ask to much about this but getting mixed ideas on this.

due to my diff going with in 300 miles i have been told i should have a slip diff.

any one here got a bec locost.
if so what diff have you got.
any probs.
how long and how many mile have you done

i had a 3.89 english
thanks terry

smart51 - 23/9/08 at 08:43 PM

I have a 3.62 LSD and it is fine for road use and shorter tracks. The top speed is 120 in 6th at the red line (98 carbed R1) with 195/50/15 tyres. Peak power is at 103 MPH in top so from about 105 MPH it really slows down. On a long straight it will top out at 120 so you're sat at max revs for a while.

A 3.38 would be better. 129 MPH top speed. Peak power at 110 MPH. Slightly lower revs on the motorway too. Slightly slower off the line though, but still fast.

andylancaster3000 - 23/9/08 at 10:41 PM

If you're using an English axle as I think you are going to need the 3.54 diff. This is the longest ratio that is commonly available for the english axle.

[Edited on 23/9/08 by andylancaster3000]

locoR1 - 24/9/08 at 06:45 AM

quote:
Originally posted by andylancaster3000
If you're using an English axle as I think you are going to need the 3.54 diff. This is the longest ratio that is commonly available for the english axle.

[Edited on 23/9/08 by andylancaster3000]


Assuming you are live axle I totally agree with above.

I ran a rebuilt 3.54 open diff for 3 years with no problems the last year being turbo charged more than up to the job if in good condition!

I've now changed to dedion but only because I wanted LSD and the 3.38 ratio the higher ratio being the most important.

If your on a tight budget I my opinion a LSD isn't necessary.