Daniel's EVPorsche 911 conversion - Page 11

daniel · 05-24-2009, 06:23 PM

Well, it was supposed to get 125 miles per charge, and do zero to 60 in 6 to 8 seconds.

But yes, getting to C d'A and back on 61% DoD is adequate, even though I had to drive 55 there and 55 to 60 back to manage it. Flow of traffic is around the 70-mph speed limit, and I had hoped to be able to do that, but at 60 to 70 mph I burn 435 wh/mi, nearly a hundred more than at 55.

You're fond of saying that you get 125 miles of range, and you've got 5-year-old NiMHs, and a car shaped like a barn door.

Picasso · 05-24-2009, 10:04 PM

What happened with the motor that was in the Porsche? Those are not known for being cheap on the used parts market. Heck the motor alone would pay for most of the parts for the conversion.

This is the guys site? http://coolgreencar.net/

JRP3 · 05-25-2009, 07:11 AM

I don't know what used motors go for but the Warp11 is about $3k, the Curtis $1.5K, and the battery pack probably $11k or more. Not to mention DC/DC, chargers, BMS, meters, etc.

WarpedOne · 05-25-2009, 07:22 AM

Porsche used engines
10 or 20 years old for 9.500 $

daniel · 05-25-2009, 07:50 AM

Quote:

Originally Posted by Picasso

What happened with the motor that was in the Porsche? Those are not known for being cheap on the used parts market. Heck the motor alone would pay for most of the parts for the conversion.

Our agreement was that Paul was supposed to sell it, take a reasonable commission, and refund the rest to me. Last I spoke with him, he said he had been unable to sell it. I will ask him again and point hm to the web site WarpedOne cited.

Daniel

Picasso · 05-25-2009, 09:28 AM

daniel, You should try and find out all the parts content of your car. Mod# and Brands. Did you get a listing of such things? I think you should get with the local EV nutts and ask them to help you learn to read your Batts, things like checking cell voltage and safe ways to dissconnect the pack. But thanks so much for sharing with us

And as others have said ditch that Curtis.

You should get this guy for your car. It will make playing the numbers game easy for you. High End AC Drive Systems and Power Electronics for Electric Vehicles

EVnut · 05-25-2009, 02:13 PM

Quote:

Originally Posted by daniel

You're fond of saying that you get 125 miles of range, and you've got 5-year-old NiMHs, and a car shaped like a barn door.

Just for the sake of full disclosure - the EPA rating of the vehicle is approx 125 miles range. That is NOT 100% freeway driving, and is from the old EPA, of course. I've always said - and still say 6.5 (not just five!) years later - that I can easily do 100 miles in my barn-door. The difference is that all systems were designed from the ground-up to be EV, and all designed to work together. Plus, very little expense was spared. Just imagine a third-generation of this system in an aerodynamic car... Oh wait... that would be something like the Roadster. :)

daniel · 05-25-2009, 02:41 PM

Quote:

Originally Posted by Picasso

daniel, You should try and find out all the parts content of your car. Mod# and Brands. Did you get a listing of such things? I think you should get with the local EV nutts and ask them to help you learn to read your Batts, things like checking cell voltage and safe ways to dissconnect the pack. But thanks so much for sharing with us

And as others have said ditch that Curtis.

You should get this guy for your car. It will make playing the numbers game easy for you. High End AC Drive Systems and Power Electronics for Electric Vehicles

Good suggestions. Thanks. (I am getting together with the local EV people.)

Quote:

Originally Posted by EVnut

Just for the sake of full disclosure - the EPA rating of the vehicle is approx 125 miles range. That is NOT 100% freeway driving, and is from the old EPA, of course. I've always said - and still say 6.5 (not just five!) years later - that I can easily do 100 miles in my barn-door. The difference is that all systems were designed from the ground-up to be EV, and all designed to work together. Plus, very little expense was spared. Just imagine a third-generation of this system in an aerodynamic car... Oh wait... that would be something like the Roadster. :)

I am enjoying the Porsche (I've decided to call it The Duck). I am happy that it will get me to Coeur d'Alene and back. It's looking as though 55 mph on the freeway is about its most efficient. 30 or 40 probably would be better if there were no stops, but there are no roads around here where you can go that slow and there are no stops. So 64 miles to 80% discharge is probably as good as it can do, unless the motor really does become more efficient, or a different controller dissipates less energy as heat.

I've sent Paul an email detailing all my concerns as well as my range tests. I think it reasonable to give him time to consider it all before expecting a reply, so I'll phone him or ask him to phone me some time this week. I'll assume he could be gone for the long weekend.

Picasso · 05-28-2009, 04:14 AM

daniel,

When you get good at reading pack charge and such, I'd love for you to remove the belt from the power steering and AC. And do a test with and with out. How much power do those guys take? Might even get you an extra 3-4mph on the freeway. I've read A/C takes a good 2-3HP and in Electric cars that is a ton! When you cycle the AC switch can you feel the drag?

The two pulleys near the big one attached to the motors are sprung, putting a wrench on one will all you to slack the belt to remove it. About a 2-3min job. take a pic of the layout first or use the one you posted here.

And again thanks for taking the the to post info about your car.

MPT · 05-28-2009, 07:02 AM

Quote:

And even Tesla had delays and mis-steps even though they threw much bigger resources at the problem. They tried very hard not to compromise on the specs they promised.

As TEG highlights, this is new ground we’re breaking (Jay Leno’s Baker Electric excepted). I think the car isn’t living up to expectation but I doubt that Paul will be happy that you’re not happy; I don’t know the guy but if he’s into BEV conversions he’s alright with me.

I consider this a work in progress that might never be finished, after all, get the mileage right and the next battery evolution will be out and you’ll want more!

I’d suggest working with Paul to keep the project going; getting it closer to where you want to be. If that means more battery investments then perhaps you should consider it, if it means limiting the max current to extend the battery life, again, part of the evolution.

And at the end of the day; you’re driving an electric 911 – I mean really, how cool is that? I’d swap my eco-peace-mobile hemp-powered Insight for that any day.