Hi --

I just bought an 84 GSL that had previously been converted to all-electric. It is not working now. The current (non-working) motor/batteries/controller appear to have been able to generate as much as110-140 ft/lbs of torque ... at 1 RPM, heh-heh.

I am looking into upgrading the batteries/controller in the short term so the motor will be able to generate as much as 225 ft/lbs. In the long term, maybe more.

What's the most torque anyone has applied to a stock tranny?

If you think this much torque will quickly break the stock tranny, do you have any recommendations for what to replace it with?

Thanks in advance.

--Jon (newbie)

 

that will probably destroy it pretty quickly. along with the rear end.
from what i understand you dont even need a transmission with an electric motor? what kind of RPM does that thing reach?

 

Thanks for the reply.

I guess I'll keep the torque low for a while, so I get to drive it a while before it breaks and I have to replace it.

No, you don't need a transmission, strictly speaking, because the torque is available right away (less/no need to gear down or rev up).

Electric motors generally have fairly low max RPM. My motor's max is about 5000 rpm. So if you go without a transmission, then you need to make the gear low enough so that the torque can still start the car moving (usually not a problem), and high enough to get the desired top speed.

OTOH, maximum efficiency is generally at or near top RPM. So, within reason, you downshift for economy and upshift for power. (!)

As I understand, anyways. I'm an electric car newbie too.

 

just have to add, this is a really badass project. i really hope you post some pictures and/or videos of this thing in the future. keep me updated

 

That is an AWESOME project.

At those torque levels I doubt you will have much problem with the stock drivetrain. You'll likely leave it in 2nd gear anyway. Stock tires will break free before you damage the drivetrain.

If you are going to be going to a larger motor that can really belt out the torque (what motor and controller?) then you can upgrade to the 2nd gen TII R-type transmission without too much trouble. The rear end will likely still be OK.

 

Motor is ADC FB1-4001. Controller TBD.

Likely to use racing slicks (Kumho 710s), though. So quite a bit more grip.

See pictures here:

http://cbfamily.smugmug.com/Other/10...10757321_YhXVo

 

OK, so with the slicks, you will certainly need a transmission upgrade. The TII transmission bolts in without only a few minor changes. As for the rear end, you are probably still OK. If not, I think Granny's Speed sells a kit to put in the 9 inch.

Hehehe...You have Rudmen Regs...