I got some questions from Mike R in Wellington NEW ZEALAND . I’m glad to help with the warning that, like most EV questions, answers will depend on your budget!
Here are the questions:
I am looking at the possibility of having a Toyota RAV4 professionally converted from petrol to electric and have spent some time searching the forums for information. I have a couple of questions you might be able to help me with:
1. In New Zealand most RAV4 petrol versions are automatic not manual. Is there any disadvantage if I used an automatic as a donor vehicle? Are all the manual or auto “bits” removed, or was the manual an essential part of the conversion?
Answer: Generally, EV conversions avoid automatic transmissions because they are tuned to shift at the wrong RPMs. Electric motors have a very different torque curve than an ICE. I’ve heard that you CAN convert an automatic, but it’s not that common. They are also heavier and less efficient.
However, if you are interested in an AC system ($$$) then you may be able to use a direct drive and eliminate the transmission. This is fairly common on rear wheel drive conversions (unfortunately, a RAV4 does not qualify as RWD). AC motors can support a wider RPM range and also support reverse. That makes it possible to omit a transmission. Unfortunately, AC systems are more expensive.
2. The same applies with 2WD and 4WD. Very few 2 wheel drives in NZ. Can an experienced mechanic remove the additional 4WD parts without a significant loss in efficiency?
Answer: I have no idea about eliminating the rear drive. I suspect that you could diasble the rear drive, but you’ll need to check with a mechanic. If possible, I’d avoid 4WD because of the extra mechanical load from the gearing.
Thank you for your help. It is a big step to take in New Zealand, as we are a long way from any RAV4-EV owners!
Regards
Mike R
May 20, 2008 at 5:53 pm
I’ve got a 1995 RAV4 with an automatic transmission. It’s got almost 150K miles and just lost the timing belt and it was recently totalled due to hail damage.
I’m not as concerned with the hail damage or the milage as much as I am the need to convert from auto to manual. I want to start a EV conversion and like the idea of using a RAV4 but is this car worth the effort?
May 20, 2008 at 8:08 pm
Dave,
I’m happy with mine and I think it’s a good platform for a first EV. I have no idea about the transmission - you may be able to buy a manual and swap it out. If you’ve got the budget then you could also consider an AC system with direct drive.
Rob
May 27, 2008 at 2:36 pm
Hi Rob,
I like your project.
I am considering trying it on a stripped down toyota 2 w-drive pickup so I can create a battery tray beneath the bed to extend the range (I am 34 miles from work).
I have two suggestions for your project;
1) check into heat exchanger technology for your air conditioning. I believe that their might be a 12v electric version available for RV use that could keep you cool.
2) go to youtube.com and type in “Aptera popular mechanics”. Ceck out PM’s test drive of this vehicle (300MPG). That is what I want as soon as they become available later this year or early next. I think you’ll like it.
Bob