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650hp 13b gearbox options?

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Sounds good mate, hope you get it working man as will pave the way for everyone else! 😎

who will do all the fab work / wiring etc? You going for it! 👍🏻
 
Mine ended up on the back of a luton with the diff lol. It had sat in the garden for 3 years under a conifer!
 
Copyninja said:
E92 M3 6 speed manual or 7 speed DCT - The supercharged e92 M3s produce between 625- 650bhp and over 410lb ft and the stock boxes can handle this all day long.

or

The F80 DCT gearbox if you want ultimate peace of mind. Unless. you are running a turbo 20b or 26b... a 13b will not make the torque required to break this box.

Benefit of the DCT box...as fast as a seq box with none of the harsh nvh /whine or maintenance.
Click to expand...

Id like to make a correction on my original post here.

DO NOT get the E92 M3 DCT gearbox for an FD RX7. The gear ratios will not suit the final drive ratio of the FD RX7 be it 3.9, 4.1, 4.3, 4.44 or 4.77.

I confirm the F80/82 M3/M4 DCT gearbox ratios will suit an FD RX7. This gearbox is rated for 700nm or 516 ft pounds of torque.

with a 4.1 final drive and 255 40 17 wheel and tyre set up the gearing is as below. Max RPM is 7500.
Tyre Circumference = 1997.42 mm
1st Gear = 45.62 km/h - 28.28 mph
2nd Gear = 84.55 km/h - 52.42 mph
3rd Gear = 128.88 km/h - 79.91 mph
4th Gear = 171.68 km/h - 106.44 mph
5th Gear = 219.23 km/h - 135.92 mph
6th Gear = 259.75 km/h - 161.05 mph
7th Gear = 326.72 km/h - 202.57 mph

with a 4.3 final drive and 255 40 17 wheel and tyre set up the gearing is as below. Max RPM is 7500.
Tyre Circumference = 1997.42 mm
1st Gear = 43.49 km/h - 26.97 mph
2nd Gear = 80.61 km/h - 49.98 mph
3rd Gear = 122.89 km/h - 76.19 mph
4th Gear = 163.69 km/h - 101.49 mph
5th Gear = 209.03 km/h - 129.6 mph
6th Gear = 247.67 km/h - 153.55 mph
7th Gear = 311.52 km/h - 193.14 mph

with a 4.44 and 255 40 17 wheel and tyre set up the gearing is as below. Max RPM is 7500.
Tyre Circumference = 1997.42 mm
1st Gear = 42.12 km/h - 26.12 mph
2nd Gear = 78.07 km/h - 48.4 mph
3rd Gear = 119.01 km/h - 73.79 mph
4th Gear = 158.53 km/h - 98.29 mph
5th Gear = 202.44 km/h - 125.51 mph
6th Gear = 239.86 km/h - 148.71 mph
7th Gear = 301.7 km/h - 187.05 mph
 
Last edited:
What rpm have you used to calculate speed. Top speed of 28mph in 1st makes it a pretty pointless gear.

Actually thinking about it might be good if you've got a high idle on a bridge or something easier the drive on the road, in traffic, as it be going slower. Rather than letting the clutch off and doing 20mph instantly
 
JoeLanger said:
What rpm have you used to calculate speed. Top speed of 28mph in 1st makes it a pretty pointless gear.

Actually thinking about it might be good if you've got a high idle on a bridge or something easier the drive on the road, in traffic, as it be going slower. Rather than letting the clutch off and doing 20mph instantly
Click to expand...

Good point I have updated the post. Max rpm I have used is 7500. For doodling about in town you can just leave it in drive and it will do the work for you and auto shift.
 
Well yeah it would be in drive, but will still be in a gear its not a cvt.
 
I’ve got the e92 box. About to embark on this shit show. By my calculations it should be fine to use with a 4.1 final drive. 265/18 tyre and revving to 9500 because anyone doing this won’t be stopping at 7500rpm.

Tyre Circumference = 2019.1 mm
1st Gear = 58.72 km/h - 36.41 mph
2nd Gear = 96.79 km/h - 60.01 mph
3rd Gear = 133.67 km/h - 82.87 mph
4th Gear = 175.44 km/h - 108.77 mph
5th Gear = 215.93 km/h - 133.87 mph
6th Gear = 233.92 km/h - 145.03 mph
7th Gear = 280.7 km/h - 174.04 mph
 
Adam said:
I’ve got the e92 box. About to embark on this shit show. By my calculations it should be fine to use with a 4.1 final drive. 265/18 tyre and revving to 9500 because anyone doing this won’t be stopping at 7500rpm.

Tyre Circumference = 2019.1 mm
1st Gear = 58.72 km/h - 36.41 mph
2nd Gear = 96.79 km/h - 60.01 mph
3rd Gear = 133.67 km/h - 82.87 mph
4th Gear = 175.44 km/h - 108.77 mph
5th Gear = 215.93 km/h - 133.87 mph
6th Gear = 233.92 km/h - 145.03 mph
7th Gear = 280.7 km/h - 174.04 mph
Click to expand...

The only thing to take note of is the max rated torque by BMW is 383.532 ft lbs or 520nm. I know it can handle 410ft lbs as the e92 m3 supercharged cars run these but not for prolonged periods of time....but if you are revving to 9500 rpm be sure the check the torque output of your engine is safe for this gearbox.
mdct.PNG
 
Some good reading here.

www.seemslegitgarage.com

So you want a DCT... Chapter 1

The world is a crazy enough place, and now you want to swap a 7-speed transmission that shifts in 50 milleseconds or into the car in your garage you call a "project car" as an excuse for it never being done? Well...we agree, that sounds like a great idea! So what is a DCT and why is it so...
www.seemslegitgarage.com www.seemslegitgarage.com

www.seemslegitgarage.com

DCT Bible, Chapter 2- Transmission Hardware

So now that we went over how capable the DCT is, let's go over how you're going to get it in your car!Transmission VersionsThe BMW 7-Speed DCT, aka the GS7D36SG, comes in four versions. They are essentially the same except for gear ratio and bell-housing combinations. They all feature the same...
www.seemslegitgarage.com www.seemslegitgarage.com

www.seemslegitgarage.com

DCT Bible, Chapter 3: Control

So now that we know more about the BMW/Getrag Dual Clutch Transmission from chapters one and two, we can further learn how to control all the spinning gears and clutch packs. Currently, the best way to do that is with the HTG GCU (Gearbox Control Unit). The GCU is a transmission controller that...
www.seemslegitgarage.com www.seemslegitgarage.com
 
Adam said:
Some good reading here.

www.seemslegitgarage.com

So you want a DCT... Chapter 1

The world is a crazy enough place, and now you want to swap a 7-speed transmission that shifts in 50 milleseconds or into the car in your garage you call a "project car" as an excuse for it never being done? Well...we agree, that sounds like a great idea! So what is a DCT and why is it so...
www.seemslegitgarage.com www.seemslegitgarage.com

www.seemslegitgarage.com

DCT Bible, Chapter 2- Transmission Hardware

So now that we went over how capable the DCT is, let's go over how you're going to get it in your car!Transmission VersionsThe BMW 7-Speed DCT, aka the GS7D36SG, comes in four versions. They are essentially the same except for gear ratio and bell-housing combinations. They all feature the same...
www.seemslegitgarage.com www.seemslegitgarage.com

www.seemslegitgarage.com

DCT Bible, Chapter 3: Control

So now that we know more about the BMW/Getrag Dual Clutch Transmission from chapters one and two, we can further learn how to control all the spinning gears and clutch packs. Currently, the best way to do that is with the HTG GCU (Gearbox Control Unit). The GCU is a transmission controller that...
www.seemslegitgarage.com www.seemslegitgarage.com
Click to expand...

Good info on there, Me and my engine builder are going for the F80 DCT conversion for a number of reasons...but also for the top speed and the gearboxes theoretical vmax of over 200mph.....which we can test out at a vmax event next year and also the higher torque limit...not that my car will ever make the torque required to break this box.

I dont have an engine build that revs to 9500rpm and i suspect many probably wont....but mine will go to 8000rpm before the turbo becomes a limit. However its more likely my TO4Z runs out of air well before 8krpm.

What setup are you running to make power at 9500rpm?
 
Copyninja said:
Good info on there, Me and my engine builder are going for the F80 DCT conversion for a number of reasons...but also for the top speed and the gearboxes theoretical vmax of over 200mph.....which we can test out at a vmax event next year and also the higher torque limit...not that my car will ever make the torque required to break this box.

I dont have an engine build that revs to 9500rpm and i suspect many probably wont....but mine will go to 8000rpm before the turbo becomes a limit. However its more likely my TO4Z runs out of air well before 8krpm.

What setup are you running to make power at 9500rpm?
Click to expand...
What diff are you going to use?
 
Keeping the standard diff. Got a hpp diff brace on it and gonna add some strength to it for the ppf delete.
 
Copyninja said:
Good info on there, Me and my engine builder are going for the F80 DCT conversion for a number of reasons...but also for the top speed and the gearboxes theoretical vmax of over 200mph.....which we can test out at a vmax event next year and also the higher torque limit...not that my car will ever make the torque required to break this box.

I dont have an engine build that revs to 9500rpm and i suspect many probably wont....but mine will go to 8000rpm before the turbo becomes a limit. However its more likely my TO4Z runs out of air well before 8krpm.

What setup are you running to make power at 9500rpm?
Click to expand...
Sounds very interesting. Do you know what gearbox controller you are using and does it link via the engine ecu aswell?
 
Last post was about two months ago but maybe it's still active.

How about a 370Z gearbox with an adapter:
collinsadapters.com

Collins Performance Adapters - Engine Swap Kits

Collins Performance Technologies engine and transmission swap kits for drifting and drag racing. High performance, high horsepower vehicle engine swaps. 2JZGTE, 1JZGTE, 2JZ, 1JZ, 350Z, 370Z, LSX, LS, 1UZ, KA24DE, K20, K24, RX-8, Supra, IS300, Engine Swap, Drifting, Drift, Drag Race, Transmission...
collinsadapters.com collinsadapters.com

The gearbox should handle it and schould be better at high rpm than a t56
 

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