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> 74 Electric Build Thread, Volt & Tesla Drivetrain
annyung
post Aug 5 2019, 07:35 PM
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So here goes nothing. I'm kicking off my build for a 400+hp awd electric conversion of my 74 914. I will part out a Volt and use the drive unit in the rear of the car, the battery will be rotated 180 and go in the tunnel between the seats. A Model S drive unit will power the front wheels completing the AWD.
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annyung
post Aug 5 2019, 07:40 PM
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My 74 914 2.0 I picked up for $3400. It was a California car but the jacking points are rusted out.
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SirAndy
post Aug 5 2019, 07:42 PM
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How are you going to synchronize the two engines?
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annyung
post Aug 5 2019, 07:44 PM
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The 2013 Volt with parts only title I will use the battery and drivetrain from.
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Valy
post Aug 5 2019, 08:09 PM
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I would just add more batteries instead of the front engine. You will need some weight on the front to get traction in front any way.
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Mike Bellis
post Aug 5 2019, 08:23 PM
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Another great project that will sell in 20 years partially completed... (IMG:style_emoticons/default/sad.gif)
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thelogo
post Aug 5 2019, 08:39 PM
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Lots of battery and 2 drive units
Better build out the suspension 1st
Sounds like it will be a 2 or 3 ton car (IMG:style_emoticons/default/beer3.gif)

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burton73
post Aug 5 2019, 08:58 PM
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Welcome to the world

I have seen some people here with unreal talent.
Some with great skill sets and some that learned on the go.

It would be nice to have a car that could go out for a nice long drive and have it so you are not freaking out on the range left.

We will be keeping an eye out on this project.

Good luck.

Bob B

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Chi-town
post Aug 5 2019, 09:05 PM
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After seeing first hand what happens to a 914 when you start adding a ton (literally) of weight to it with my car that had an electric conversion in it when I got it, you may want to pick a different chassis specifically one with a solid roof and real brakes.
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Andyrew
post Aug 5 2019, 10:00 PM
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As an engineering feat it's going to be cool to see the first electric AWD 914 (IMG:style_emoticons/default/smile.gif)
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thelogo
post Aug 6 2019, 12:11 PM
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QUOTE(Chi-town @ Aug 5 2019, 08:05 PM) *

After seeing first hand what happens to a 914 when you start adding a ton (literally) of weight to it with my car that had an electric conversion in it when I got it, you may want to pick a different chassis specifically one with a solid roof and real brakes.



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Ford ranger maybe
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Chris914n6
post Aug 6 2019, 02:28 PM
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QUOTE(Chi-town @ Aug 5 2019, 08:05 PM) *

After seeing first hand what happens to a 914 when you start adding a ton (literally) of weight to it with my car that had an electric conversion in it when I got it, you may want to pick a different chassis specifically one with a solid roof and real brakes.

I've seen the same thing with V8 cars and race cars. The 914 weighs 2000lbs because they used the bare minimum in sheetmetal. People have engineered and fabricated reinforcement parts since the factory race cars.
With all the forces involved and cutting you are doing, you are better off starting with a coupe at least from the 90s like an RSX or 240sx.
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ChrisFoley
post Aug 7 2019, 05:17 AM
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QUOTE(burton73 @ Aug 5 2019, 09:58 PM) *

Welcome to the world

I have seen some people here with unreal talent.
Some with great skill sets and some that learned on the go.

It would be nice to have a car that could go out for a nice long drive and have it so you are not freaking out on the range left.

We will be keeping an eye out on this project.

Good luck.

Bob B

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+1
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bbrock
post Aug 7 2019, 07:53 AM
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I also like this project. Love the can-do spirit. I'm also curious about how the front and rear motors will be synched. Someone mentioned brakes. From what I've read, both the Volt and Model S have regenerative braking. Any chance this will be incorporated into the build?

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rbzymek
post Aug 8 2019, 11:57 AM
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QUOTE(bbrock @ Aug 7 2019, 07:53 AM) *

I also like this project. Love the can-do spirit. I'm also curious about how the front and rear motors will be synched. Someone mentioned brakes. From what I've read, but the Volt and Model S have regenerative braking. Any chance this will be incorporated into the build?

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After retiring from Ford I worked at a consulting company where one of the projects was the conversion of a Toyota Corolla to battery electric using Li-Ion batteries. The scope of that project was easier than your conversion because there was no IC engine to deal with and there was only one electric machine. We used a Siemens motor and a Borg Warner single speed trans axle. I architect-ed the Motohawk controller and wrote the Simulink software that "glued" all of the bits together including the battery management system, motor controller and shift lever. The was no thermal management system for the battery packs that were packaged in three locations (not recommended). Your biggest challenge will be the software to make the battery pack and the electric motor happy and allow it to function. Those OEM systems require a lot of handshakes to enable them to function. (We also did some consulting on the VOLT battery system).

Good luck on your project and keep us posted!
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burton73
post Aug 8 2019, 02:19 PM
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As the First one on 914 world to own a Tesla S (ask Eric @PMB) I gave the guys and Eric a ride when they picked up my 6 for restoration. Early 2014 (Five 5 years ago.) I was 127 on the reservation list for my car, so I was a believer. 220 miles on my 60 packs O yea I bought lot of Tesla stock back in the 2013-time frame. I believed musk could do it.

I also drove a Volt when GM had a demo of their cars at Hollywood Park parking lot and the pack in the 2012 went away very fast like 30 miles. They had a nice course set up.

It would seem to me that you would want to work on the rear wheel drive set up and put some modern extra batteries up front. Batteries in the center may be a tight fit like the Karma Frisker that made for an odd seating position in in my humble option. The 914 is super narrow so ck that out.

You need to rebuild the longs and maybe put extra bracing there. That is a big job but I take it that you can weld.
If you could put in the regen braking that would be sweet. This is a huge undertaking and it will be sweet.

Good luck.

Bob B
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90quattrocoupe
post Aug 8 2019, 03:14 PM
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Good luck.
I learned a long time ago, that if you have an idea, try it.

If you don't, you will wonder for the rest of you life, if it would have worked. Many ideas came to fruit just by people trying something new.

Greg W.
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annyung
post Sep 3 2019, 10:00 PM
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Dropped the drive unit/generator from the Volt.
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annyung
post Sep 3 2019, 10:03 PM
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Battery dropped as well. Time to get the shoe horn out.
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914forme
post Sep 4 2019, 06:23 PM
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Are you running the Volt generation unit also? I would be down with that one. I have only seen one but there is a volt running around that has a diesel powered generation unit. Last time I saw it pop up, it was getting a true 126 Mpg, think diesel locomotive, very same concept.

As for all the stuff, all he needs down the center tunnel is the batteries, everything else can be ran out the logs if need be. A 5 gallon fuel cell will get you a pretty far piece as the volt is a hybrid, and the Bolt was the true electric.

Best of luck with the build, your resume suggests you can work out the drive sync issue with a bit of software and a controller. Couple of wheel sensors or flange sensors and you could sync them up no issue.

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BTW if you look at two builds on here your center tunnel should not be an issue, and you will actually increase rigidity if done correctly.

Thanks for the update and carry on.

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