Diff size

[Brett Nield]

just had the R500D re mapped by the two Steve’s, absolutely fine chaps by the way, they say the terminal velocity in 6th is 163 mph. Surely this is too high, especially for track use. Anybody out there know what the ratio should be. Interestingly they got the output to 283 BHP

[DCL]

Assuming it a Sierra diff, It really depends what RPM limit they were using and tyre size you have but that sounds like a standard 3.62 diff. More info can be found here about possible ratios.

http://www.super7thheaven.co.uk/components/sierra_...

283 BHP from a 2L duratec is good and suggests it's probably not standard R500 and I'd guess at least that induction and exhaust have been improved.

I personally ran a 3.92 with a similar sort of engine which gave 130 ish top speed. Worked well for me on the tracks I used, but that's down to where, and how, you will use the car. At that BHP you probably looking at a real max speed of 135-140 mph.

Edited by DCL on Sunday 30th September 17:47