Has anyone actually tried a lower ratio diff on an M40 1.6?
The numbers say that dropping from a 4.27 to a 3.73 would take 500 RPM off cruising speed in 5th, which would be good: 70 @ 3000RPM.
In fact, all speeds in all gears look less frantic. First is way too short as it is, so any slight increase there wouldn't make take-offs too difficult.
I know it'd dull acceleration, but would it be better as a daily driver?
3.73, 3.91 or 4.10 diffs on an M40 316
Moderator: martauto
Ya, but to be honest, Even at 4.45 on 50profile tryes, it's not going to rip the ground from underneath it, is it?
I'd agree in that 1st feels crazy short on a 316.
I'd go for the 4.1 if you have a 4.27. It'll make drifting way more fun too if thats your boat since you will be able to hold 1st longer rather than having to pull 2nd half way across the road
I'll swap you a 4.1 if it's a 4.27 or 4.45
I'd agree in that 1st feels crazy short on a 316.
I'd go for the 4.1 if you have a 4.27. It'll make drifting way more fun too if thats your boat since you will be able to hold 1st longer rather than having to pull 2nd half way across the road
I'll swap you a 4.1 if it's a 4.27 or 4.45
M42 rightness above 6500rpm, nobody can hear you scream
4.1 is as low as I'd go...
Suppose if all I was ever doing is motorway driving a 3.91 would be ok, but god help me if I wanted to overtake any quick trucks, lol.
Suppose if all I was ever doing is motorway driving a 3.91 would be ok, but god help me if I wanted to overtake any quick trucks, lol.
M42 rightness above 6500rpm, nobody can hear you scream
Thanks guys!
I know there's more to it (engine speed vs torque @ the crank not being flat for one), but assuming you're in a relatively flat mid-band and within 500RPM on either diff, wouldn't dropping 4.27 to 3.73 only mean a decrease of about 14% wheel torque for a given road speed and gear?
I suppose it must kill something other than the 0-60 time though, otherwise they'd probably be like that from the factory for the sake of MPG and engine lifetime.
Still hoping that someone's actually tried it to hear first hand...
I know there's more to it (engine speed vs torque @ the crank not being flat for one), but assuming you're in a relatively flat mid-band and within 500RPM on either diff, wouldn't dropping 4.27 to 3.73 only mean a decrease of about 14% wheel torque for a given road speed and gear?
I suppose it must kill something other than the 0-60 time though, otherwise they'd probably be like that from the factory for the sake of MPG and engine lifetime.
Still hoping that someone's actually tried it to hear first hand...
