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  #11  
Old 05-11-2012, 08:30 AM
marc02228 marc02228 is offline
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Default Re: Planning another Miata conversion

Quote:
Originally Posted by Ziggythewiz View Post
My calcs say it requires 116kW to do that. Add in inefficiencies and you're easily around Tesla's numbers.

Also, the motor does not provide the power, the batteries do. The controller converts that power and the motor passes it to the drivetrain.
hmm, i might have an error in my calculations, then. Here is my calculation method without considering the losses (inefficiencies):
P=F*a
F=m*a
a=v/t

-->P=m*v/t
-->P=1200kg * (27m/s)/3.9s = 224308 Ws/s ≈ 224kW

mmh, I've no idea, what's wrong.. how did you do your calculation?
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  #12  
Old 05-11-2012, 08:41 AM
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Ziggythewiz Ziggythewiz is offline
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Default Re: Planning another Miata conversion

I did kinetic energy = .5MV^2

If you want a 1200 kg object to be moving at 100 kph it's energy will be 600 * 27.78^2 = 462963 joules (watt-seconds) To give it that much energy over 4 seconds would require 116 kW plus all the losses.
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  #13  
Old 05-11-2012, 02:07 PM
somanywelps somanywelps is offline
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Default Re: Planning another Miata conversion

Being heavier is not a problem if you beef up the suspension. 50kg is like the weight of a person.

Are they going to weight the car or something?

Edit: not exceed original power? F that.

If they are going to test it, just dial in a low amperage on the soliton.

Raise it once you're done.

Last edited by somanywelps; 05-11-2012 at 02:14 PM.
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  #14  
Old 06-03-2012, 01:30 PM
marc02228 marc02228 is offline
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Default Re: Planning another Miata conversion

Just bought the donor car.
Standart Miata without power steering and another front bumper.
Really good condition
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  #15  
Old 06-03-2012, 02:36 PM
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Ziggythewiz Ziggythewiz is offline
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Default Re: Planning another Miata conversion

Looks great! Is that a swell mid hood (bottom pic)? If so, I believe you're obligated to find a motor large enough to fill it. Maybe a 13"?
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  #16  
Old 06-04-2012, 04:56 PM
marc02228 marc02228 is offline
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Default Re: Planning another Miata conversion

Yes, I probably should do that
But actually can't decide whether to take the Kostov 11 Alpha or the K9 220V right now..
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  #17  
Old 06-08-2012, 10:55 AM
marc02228 marc02228 is offline
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Default Re: Planning another Miata conversion

Could anyone please explain, how one can remove the fuel tank from the car?
Somewhere I read that you have to do it from under the car and take out many other parts. but don't find it anymore...

Gonna pull the engine out, tomorrow.
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  #18  
Old 06-08-2012, 11:22 AM
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Default Re: Planning another Miata conversion

Do you have the car manual? With my bug it was just disconnect the hose inlet and undo a few bolts. The hard part was pouring enough out to make it easy to lift (siphon would have made that easy). With my van you have to lower it, undo top connections, then remove the support straps.
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  #19  
Old 06-08-2012, 03:33 PM
galeson galeson is offline
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Default Re: Planning another Miata conversion

evlowrider has a thread on here somewhere where he shows how to take it out through the top. That's the way I did it. I used a reciprocating saw to cut the corners off the tank. Of course make sure it is totally empty in case you cut into the tank.
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  #20  
Old 06-08-2012, 05:21 PM
Batterypoweredtoad Batterypoweredtoad is offline
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Default Re: Planning another Miata conversion

Quote:
Originally Posted by marc02228 View Post
Could anyone please explain, how one can remove the fuel tank from the car?
Somewhere I read that you have to do it from under the car and take out many other parts. but don't find it anymore...

Gonna pull the engine out, tomorrow.
You have to remove the rear subframe to take out the fuel tank. It isn't as daunting as it sounds. You remove the 2 top shock bolts, a single brake line, two big Power Plant Frame bolts, the 4 driveshaft bolts, a couple of clips holding on battery cables and such, and then remove the big bolts holding the subframe up. It shouldn't take more than a couple of hours to get the tank out. While you have the subframe out I would suggest replacing the suspension bushings. Any Miata that age has completely worn out suspension bushings.
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