[Jordysport]

Hi Guys been a long long time since i've been on here, a bit of an update i've now Graduated as a Motorsport Engineer and i have been looking at taking one of my race cars i have kicking about the workshop and develop it into an EV racer. and finally i have secured funding to do so.

Here in the UK we have a motorsport series called Hillclimbing, on average 1-2 miles of tight twisty's commonly uphill all on tarmac. most of the time the climbs are circa 40 seconds some upto 2 mins so range is not an issue...ideal you say for EV's. the car is a Jedi Single seater with minimal aero on it, in comparison to a formula ford 0.8m^2 (CdA) and a Jordan 191 F1 car 1.1m^2 (CdA) one with alot more aero and one alot less, and the formula ford being similar size I can assume a CdA of circa 0.9-1.0 (as i cannot do any coast down tests atm).

Some Specifications on the vehicle:

Vehicle Weight with Yamaha YZF1000 engine + Driver - 270kg
Vehicle Weight Enginless - 120kg

Now the replacement needs to be just as quick if not quicker, so the current engine produces 130Kw with fairly linear delivery: http://www.dynobike.com/images/graphs/r1_cbr1000_2.jpg

And on average 50lbsft of torque.

Now the main question:

Motors.......I am limited to an 11" diameter MAX as thats all that will fit in the chassis and battery space is limited but the side pods can be used.

What sort of motor would be required to achieve this performance, I can do all the calcs its just its not very accurate using Peak and Rated power and torque figures. if at all possible i would like to use a local company that produce these PM motors:

http://www.lmcltd.net/uploads/files/...C%20Motors.pdf

and if i used the 2x2 (2motors) in a small package of 25cm cubed producing 72kW , 84Nm Power at 72V which is pokey enough but will it be enough.

Thanks
Jordy

[Jordysport]

What sort of Torque/Power does a Warp11 144v 1000A produce?? am thinking something along those lines, but a little difficult to find data on the motors as they're only upto 72V 600A

[ddmcse]

I haven't been on a dynometer yet but I am very pleased with the torque I can get out of my WarP11 I've been running my car for a few years now. I drive it to work every day. It is all about the batteries, to that end I would look into a High Voltage WarP11. I have just started a dealership for Netgain motors and I have a brand new one in the box ready to send to you.
she feels way better that the 300 ft-lbs I had as a gas burner

https://youtube.com/ddmcse

[Woodsmith]

As your thread is mostly about motors I have moved it to the Motors forum.

Sounds like a great project.

[Jordysport]

Originally Posted by ddmcse

I haven't been on a dynometer yet but I am very pleased with the torque I can get out of my WarP11 I've been running my car for a few years now. I drive it to work every day. It is all about the batteries, to that end I would look into a High Voltage WarP11. I have just started a dealership for Netgain motors and I have a brand new one in the box ready to send to you.
she feels way better that the 300 ft-lbs I had as a gas burner

https://youtube.com/ddmcse

Well i am looking at some High Power Headway 38120 8ah cells upto 10C cont. I am just struggling to find a V , A , & Motor Combo to give the performance required.

0-60 circa 3.5-4 seconds
Top speed More the better but must be over 100mph
Obviously this is in a chassis that will weigh less than 500kg converted, it weighs 240kg with driver atm.

[ddmcse]

I can do 100mph with my 3800 pound beast, not for long but I can do it.

[Jordysport]

Originally Posted by ddmcse

I can do 100mph with my 3800 pound beast, not for long but I can do it.

So it should be easily possible in an 800lbs car (converted for you yanks )

[MalcolmB]

Back of an envelope calculation says you need a motor that produces around 200 ft lbs (270 Nm) up to 3000 rpm to meet your acceleration target. With a 3:1 reduction that would take you to 100 mph at around 4500 rpm. The Lemco motors won't do it, and the Warp 11 sounds like overkill to me (as well as being heavy). Since each run is no more than a couple of minutes you could run a smaller motor at high amps...

[ddmcse]

yeah the WarP11's are 240 lbs. I was thinking of using a 9 in my next one
A 9 is a good idea and I have that on hand as well. brand new in the box
obviously I'm not planning on a supra

[Jordysport]

Hey Guys,
My spreadsheet confirms what you are saying a 270Nm input will achieve 0-60 time of 3.98 seconds with 144v 64ah pack at 1000A controller limit (using headway high power cells) with a gear ratio of 3.14 from the use of a sierra diff.