Originally Posted by skooler
The Evnetics controllers will hapily convert volts to amps but not the other way around - So higher voltage is typicaly better..
Power is power, the difference between the two is how much torque is applied. 600A should be about 150ft lbs (from 0RPM dont forget!) I dont think you could actually put the power down if you went higher, my RX8 with a Soliton Jr has problems putting the power down if I floor it.
I think 600Amps will provide oozles of torque for your application. going higher voltage means you can get the RPMs all the way up to the Kostovs limit. 340ish volts on the proposed headway pack may sag by a third at full current, so you still have all the volts you need for the motor.
yabert has an excellent smart conversion using headway cells.
Is there any way at all you could get some form of transmission/gearing in there?
What do you think about the variator idea? too weak?
Yes there will be gearing it won't be bolted straight to the driveshaft, theres going to be approximatly 14/34 ratio so approx 2.4 Min upto about 3/4 so i can vary the top speed according to the hill climb
a gear ratio of 2.4 at 6800rpm gives a (theoretical (power dependent) top speed) of 170mph and at 3.5 gr at 6800rpm gives 116mph so i should have a variation of 90mph-170mph top speed gearing. but if i used the 11" at 5800rpm limit. comes down to 75mph-150mph which is pretty reasonable.
At the end of the day surely the car is sooo light and with it geared down, it shouldn't be an issue.
Re-traction issues, you have to remember i am running ultra sticky slicks 14" wide at the rear, there nothing like road tyres.
At 340V it gives 316V after sag, it is alot 105s4p (32ah) or could i go less on Ah maybe 105s2p (16Ah) bit better at 210 cells, i am sure i could fit alot more cells in though.
Am modellng the chassis tonight, once the new solidworks has downloaded on my home pc. so should give a better idea of the setup i am looking at.