Guys, please help me choose a diff for a 6 speed and m20 stroker.
In my plans I have a NA m20 stroker with peak flywheel torque of no more than 300Nm (220lbf) and peak power no more than 240 flywheel horse and redline of no more than 7000rpm (optimistic figures). Think m54b30 which by the way had either 2.93 or 3.07 final drive in e46, z3 and z4.
I want to mate it with a 6 speed gearbox.
The box is GS6-37DZ from a 2L turbodiesel (e46, e90, etc...).
Since it is for a low revving diesel, the gears are spaced quite far apart.
Here are the ratios compared to Getrag 260:
Since the gears are this much far apart, I can't decide on my final drive. I either get ridiculous tall 6th with top speeds in range of 300km/h (190 mph) which will be impossible to achieve or a ridiculous short 1st which will be of no use except when parking the car. Tire size for calculation 225/45R16.
I've narrowed my selection to 2.79 2.93 3.07 3.15 3.23 and 3.25.
I've made a table where I present a closest final drive equivalent with a G260 for every gear in GS6-37DZ with a certain final drive from the selected 6 options.
For example you have the six speed with 3.15 final drive. The 1st gear will drive similar as 1st in g260 with 4.27 and the 6th gear will drive similar as 5th in g260 with 3.23 final drive.
Anyone with a built eta and a stock 2.79 diff?
Or running 4.45 with g260?
Please post your experiences and opinions.
In my plans I have a NA m20 stroker with peak flywheel torque of no more than 300Nm (220lbf) and peak power no more than 240 flywheel horse and redline of no more than 7000rpm (optimistic figures). Think m54b30 which by the way had either 2.93 or 3.07 final drive in e46, z3 and z4.
I want to mate it with a 6 speed gearbox.
The box is GS6-37DZ from a 2L turbodiesel (e46, e90, etc...).
Since it is for a low revving diesel, the gears are spaced quite far apart.
Here are the ratios compared to Getrag 260:
Since the gears are this much far apart, I can't decide on my final drive. I either get ridiculous tall 6th with top speeds in range of 300km/h (190 mph) which will be impossible to achieve or a ridiculous short 1st which will be of no use except when parking the car. Tire size for calculation 225/45R16.
I've narrowed my selection to 2.79 2.93 3.07 3.15 3.23 and 3.25.
I've made a table where I present a closest final drive equivalent with a G260 for every gear in GS6-37DZ with a certain final drive from the selected 6 options.
For example you have the six speed with 3.15 final drive. The 1st gear will drive similar as 1st in g260 with 4.27 and the 6th gear will drive similar as 5th in g260 with 3.23 final drive.
Anyone with a built eta and a stock 2.79 diff?
Or running 4.45 with g260?
Please post your experiences and opinions.
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