[Batterypoweredtoad]

You have a perfect chassis for dual Kostov 220v 9" with one driving each wheel. Wire them in parallel on a Soliton 1 and you get a limited slip effect and 1000 amps worth of torque. It would take reworking your sprocket setup.

[Jordysport]

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.

Cheers
Jordy

[Batterypoweredtoad]

Remember a Soliton has a hard limit of 350V or it wont turn on. Your charged 105s pack will be well above that.

[Jordysport]

Originally Posted by Batterypoweredtoad

You have a perfect chassis for dual Kostov 220v 9" with one driving each wheel. Wire them in parallel on a Soliton 1 and you get a limited slip effect and 1000 amps worth of torque. It would take reworking your sprocket setup.

How would i fit them in the chassis, the thing is i can fit one transverse via chain to sprocket due to the fact the diff & sprocket is offset in the chassis its not central. plus lookup Sawbench corner at wiscombe, its a massive harpin, and it won't be a LSD it would be a welded diff effectivly and it would spin up the rears.

[Jordysport]

Originally Posted by Batterypoweredtoad

Remember a Soliton has a hard limit of 350V or it wont turn on. Your charged 105s pack will be well above that.

3.6/3.7V fully charged no? off the top of my head. so less than 97s

[Batterypoweredtoad]

Originally Posted by Jordysport

How would i fit them in the chassis, the thing is i can fit one transverse via chain to sprocket due to the fact the diff & sprocket is offset in the chassis its not central. plus lookup Sawbench corner at wiscombe, its a massive harpin, and it won't be a LSD it would be a welded diff effectivly and it would spin up the rears.

With each axle separate with a separate motor for each with the motors wired in parallel it would behave like a limited slip. If they won't fit then none of that matters i guess.

[Jordysport]

Originally Posted by Batterypoweredtoad

With each axle separate with a separate motor for each with the motors wired in parallel it would behave like a limited slip. If they won't fit then none of that matters i guess.

Max width of the chassis rails is 550mm Outer edge to outer edge, 22 inches giving a minimum overhang of 5 inches each side which is 12.5 cm not a huge amount and it is possible, but i assume your thinking the motors transverse straight to the shafts?

[Batterypoweredtoad]

I was thinking motors facing each other with sprockets on the shafts and dual chain drive sprocket setups on the axle. Basically it would look like what you have but 2 sprockets instead of a diff.

motor/sprocket space sprocket/motor
chain chain
axle/bearing/sprocket/bearing space bearing/sprocket/bearing/axle


Lol-hope my formatting sticks

[Jordysport]

Originally Posted by Batterypoweredtoad

I was thinking motors facing each other with sprockets on the shafts and dual chain drive sprocket setups on the axle. Basically it would look like what you have but 2 sprockets instead of a diff.

motor/sprocket space sprocket/motor
chain chain
axle/bearing/sprocket/bearing space bearing/sprocket/bearing/axle


Lol-hope my formatting sticks

Yeah thats what i thought you meant,

I think for simplicity to start with a single motor would be good, after which if i need more i can always go down that route. Looks like a 11" Alpha will fit in there so i am thinking down that route, with soliton1. headway cells (430mm (L) x 420mm (W) x 240mm (H) est 180cells and space along side the motor of (300mm (L) x 140mm (W) x 240mm (H) est 96 cells which would nicely give 95s3p but i could get another 100 cells above the chassis rails upto the engine cover, to up it to 95s4p to allow full 1000A on the controller.

[Ace_bridger]

This is one of the best threads i've ever read on this forum!! Some great minds offering great suggestions for the greater good.

I'm going to be watching how this monster develops very closely.

So pleased to see this all going on in the UK! Awesome, well done.

Adam