Hot-rodding the Toyota MGR

[freebeard]

What I was looking at was the shock-absorbing characteristic of the guibo. But they're more for not tearing up the drive train when the wheels leave the ground temporarily at full throttle. The MGR doesn't have a clutch, so the only things it would protect against the shock loading from the electric motor would be the CV joints and axles.

As for making a waterwheel, you probably could. I think you could wire the three phases together to produce DC. Unless you're planning on generating 3-phase AC.

This reintroduces the problem of eliminating the differential action. And to get maximum power it would need to be geared to turn at 10,000rpm.

[rmay635703]

https://www.diyelectriccar.com/forum...9&postcount=16

It’s getting closer, one beemer is cooled MGR powered

[freebeard]

That's good to see. Do you know if the GS450h/LS600h uses the Interchange Part Number: 300-65002? Because from the link:

I know Damien was looking at control of the two-speed transmission inside these units, and I am looking into the HV converter which lives inside the inverter/converter unit.

I've still got one of these sitting on the bench. I was desponded* by exactly what Damien and Jack Bauer are tackling. I've only read the first page of the diyelectriccar.com/ post so far.


* Didn't think it was a word but it is.

[rmay635703]

Apparently these mount very differently (different drivetrain layout)
but the method to breakdown the communication protocol is the same.

Now if someone could find a smaller Prius AWD-e transaxle and controller in the flesh

[freebeard]

I decided to have a look. I found no mention of hp and torque, but it's a tidy little package.

https://www.hybridcars.com/2016-toyo...on-us-markets/
The headline says non-US markets, but the text says Japan only. Maybe Canada? In Japan it's for their Winter weather.

It's mentioned in this article that has a video that talks about active grille shutter, temperature sensing steering wheel and 15" low rolling resistance tires (but not the E-Four). https://youtu.be/WNh6eFtTtlA
e-Four – 2016 Toyota Prius Has AWD System is only for Japan – Video | DPCcars

It doesn't say whose tire, but there is a Bridgstone Ecopia in the right size. https://tiresize.com/tires/Bridgesto...-195-65R15.htm

[freebeard]

Today I retrieved the MGR that I'd left with an organization called Vintage Underground (they do EV conversion of XKEs). The owner offered to characterize it, but he's out of town and the people who looked at it didn't do any investigation, they rejected it on the grounds that it's geared for 35MPH. Or that power to it is cut at 35MPH.

Paging aeroheaad: 10,000RPM X 6.78 axle ratio is 1475RPM at the 26.6 diameter wheel[?] That appears to be 6.9ft/revolution, but I try to get from ft/minute to miles/hour and I can't obtain a consistent result.

I doubt the clutchless unit adds drag from 35MPH to the Lexus' top speed.

[GrayRaceCat]

Originally Posted by freebeard

Today I retrieved the MGR that I'd left with an organization called Vintage Underground (they do EV conversion of XKEs). The owner offered to characterize it, but he's out of town and the people who looked at it didn't do any investigation, they rejected it on the grounds that it's geared for 35MPH. Or that power to it is cut at 35MPH.

Paging aeroheaad: 10,000RPM X 6.78 axle ratio is 1475RPM at the 26.6 diameter wheel[?] That appears to be 6.9ft/revolution, but I try to get from ft/minute to miles/hour and I can't obtain a consistent result.

I doubt the clutchless unit adds drag from 35MPH to the Lexus' top speed.

Using the numbers you provide,
10,000 RPM motor speed
6.78:1 drive ratio
and 26.6" Tire Diameter

10000 RPM divided by 6.78:1 drive ratio = 1474.92625 RPM to the tire.
26.6" diameter tire = 13.3" radius.
Circumference=2xPIxradius, 2·π·13.3≈83.56636 In/Revolution.
83.56636/12 ≈ 6.9642 Ft/Revolution.
1474.92625 RPM x 6.9642 Ft/Revolution ≈ 10271.682 Ft/Min.
10271.682 Ft/Min x 60 Min/Hr ≈ 616300.92 Ft/Hr
616300.92 Ft/Hr / 5280 Ft/Mile ≈ 116.724 MPH

You may have forgotten to convert from Ft/Min to Ft/Hr before converting to MPH. I did the first two times I tried, and I got just over 37 MPH.

I suppose it's possible that they use it only to assist with low-speed acceleration and cut power so it free-wheels above 35 MPH.

[freebeard]

I did the first two times I tried, and I got just over 37 MPH.

Are you saying that to make me feel better? I got multiple results and had no way to choose between them. maybe they made the same mistake. 37 and 35MPH are pretty close.

IIRC there's nothing in the gear-train that would freewheel. Even with no power, one would think there'd be eddy currents and/or back EMF.

I may consider using it for a generator in a micro-hydro installation. Put a sprocket on each hub and attach both to a jackshaft.

[GrayRaceCat]

Originally Posted by freebeard

Are you saying that to make me feel better? I got multiple results and had no way to choose between them. maybe they made the same mistake. 37 and 35MPH are pretty close.

IIRC there's nothing in the gear-train that would freewheel. Even with no power, one would think there'd be eddy currents and/or back EMF.

I may consider using it for a generator in a micro-hydro installation. Put a sprocket on each hub and attach both to a jackshaft.

Nope, I honestly made the same mistake twice. I included my work so it could be checked. If I made any errors, I want to know. The only difference I can see is I didn't round my numbers. I suppose that could account for the 2 MPH difference. I had to take a break and come back to it. My wife was wondering what was wrong with me!

You mentioned, "Maybe they made the same mistake." Very possible, especially if they aren't the ones who normally do it. As I recall, you said the owner was out of town. I'd bet they did screw up. Have you considered bench testing it to see if it is indeed limited to 35 MPH?

As for my "free-wheel" comment, I misspoke. Toyota/Lexus would probably make use of any eddy currents and/or back EMF to charge the traction battery instead of letting it go to waste.

[freebeard]

Have you considered bench testing it to see if it is indeed limited to 35 MPH?

So far as I know, the test would require a VFD controller and a battery bank. I was trying to get them to do it, with the opportunity to acquire it if they wished. I can email the owner and ask for a citation on their claim.