Toyota MGR Rear Traction Transaxle

[ZooKeeper]

I'm pretty shure that resolver calibration plug and three retaining bolts situated on the outside of the MGR is for good reason - to calibrate every single MGR on the production line. That means non of them have the same syncofs.

LOL! See now I was thinking the exact opposite.... so they COULD get them to be the same.

[konstantin8818]

Anyone know the thread on the oil drain and level check plugs?

All three plugs are M18x1.5 Length 11mm.

[Mouse]

Anyone know the thread on the oil drain and level check plugs?

The filler is M18 by 1.5mm pitch and I haven’t taken the drain out but cant imagine it's different.

[Mouse]

Beaten by seconds
At least there's confirmation on that now.

[TheSilverBuick]

I was just coming back to say I don't know the diameter but definitely measured 1.50 thread count.

[ZooKeeper]

I need to get my eyes examined

[Kevin Sharpe]

Damien has posted an MGR update on patreon;

https://www.patreon.com/posts/too-many-41106869

[konstantin8818]

Damien has posted an MGR update on patreon;

https://www.patreon.com/posts/too-many-41106869

I believe now he is up to design oil cooling. I'm still in doubts of what is most simple, cheap yet efficient way to cool oil.
Heavy duty oil pumps are way too expensive even on ebay and aliexpress. My thought is to glue brass water tubes on the outside of casing in most heated places for better heat exchange.

[Jack-Lee]

Now anyone could say how the rpm/V is? I really need 600V for reach the 50kW?

[ZooKeeper]

Now anyone could say how the rpm/V is? I really need 600V for reach the 50kW?

I have tested at 165v & 7000RPM no load, but have not found any documentation of the ampacity of the MGR, having said that 100A @ 500V = 50kW and the wires appear to be about 8ga.

[ZooKeeper]

I believe now he is up to design oil cooling. I'm still in doubts of what is most simple, cheap yet efficient way to cool oil.

My plan, if needed, is to use a universal (low pressure) in-line fuel pump and turn it on with a snap-switch at about 70*C.

B+__fuse____/ ___Pump___B-

[konstantin8818]

My plan, if needed, is to use a universal (low pressure) in-line fuel pump and turn it on with a snap-switch at about 70*C.

Hot oil most definitely will destroy fuel pump. But give it a try, maybe I'm wrong.

[Kevin Sharpe]

I believe now he is up to design oil cooling. I'm still in doubts of what is most simple, cheap yet efficient way to cool oil.
Heavy duty oil pumps are way too expensive even on ebay and aliexpress. My thought is to glue brass water tubes on the outside of casing in most heated places for better heat exchange.

Why don't we get a MGR working in a car before speculating about oil cooling?

[Mouse]

Could an electric power steering pump be used for circulating the cooling oil?
Cheap, plentiful and designed for continuous automotive use.

[konstantin8818]

Could an electric power steering pump be used for circulating the cooling oil?
Cheap, plentiful and designed for continuous automotive use.

Never thought about it. Great idea. Opel tigra or ford fiesta has got electric pumps. Need to check prices.

[ZooKeeper]

ATF won't hurt a universal fuel pump one bit and the temps involved are not much higher than many areas of the desert southwest in the USA.

[Jack Bauer]

Anyone experiencing problems running motors in reverse after successful tuning please set fwkp to 0 and try again. Johannes and I are working on this problem. A full tuning and tutorial video can be expected in about a week.

[Kevin Sharpe]

[MattsAwesomeStuff]

Sweet! An MGR Project. I don't know if I've ever actually seen one.

The MGR is my backup plan for whey my 260lb forklift motor --> transmission --> old differential just doesn't work properly. It's also maybe my plan for the front part of AWD.

Can't wait to see more on this.

But wait... the criticism!

"This will never hold. It's not designed to be used for more than 0.8 seconds or it will turn into the fires of Mordor!"

I dunno, maybe it melts, maybe it's fine. I really really really want to find out just how badly it may or may not need some limited cooling.

[ZooKeeper]

Sweet! An MGR Project. I don't know if I've ever actually seen one.

IF my damned car would ever get here, it would be very close to on the road!

[Kevin Sharpe]

Sweet! An MGR Project. I don't know if I've ever actually seen one.

Yeah, just a shame it has to be Damien doing the work once again

[konstantin8818]

Anyone experiencing problems running motors in reverse after successful tuning please set fwkp to 0 and try again. Johannes and I are working on this problem. A full tuning and tutorial video can be expected in about a week.

Thank you! Will do. Just need to get rid of spider webs all over mt test setup=)

Yeah, just a shame it has to be Damien doing the work once again

My adapters for BMW's driveschafts are in production now, but job is always before hobby. And deadlines are long gone

[tom3141]

I’m also in the process of sorting driveshafts for mine. The car is converted already so I should be able to test fairly soon once I have the driveshafts done. I’m not going to worry about cooling unless it becomes a problem. The stock car is 700kg with a 660cc 64hp engine so I’m think it will be fine.

[TheSilverBuick]

I go away on a 3 week vacation and the MGR topics take off! I'm extra excited to get back to my project. Sadly I'm still on the bottom side of the learning curve and not (yet) able to meaningfully contribute.

On the coolant pumps. I would not run an off the shelf fuel pump with fluids above around 150ºF. I have a feeling the plastics inside most melt around 180ºF. There are dedicated external electric oil pumps people use for remote mounted turbo's. I like the idea on the electric power steering pump. In my case, I plan on using a fan and if needed figure out how to attach some cooling fins.

[ZooKeeper]

I realize this is not necessarily a direct comparison, but the ORNL research suggests two things that are important to remember when adapting Toyota drives for EV use.

See Figure 3.14 (aka Pi ) https://www.osti.gov/servlets/purl/890029

1) The temperature limit of the MG units is VERY high, much higher than normal "engine" temperatures due to presumed "Class H" insulation
2) Higher lube temperature increases drive and thermal rejection efficiency

The publication suggests that the MG units can tolerate 180*C essentially continuously, which is above typical lubricating fluid breakdown temperatures. In fact, rotor temps over 200*C were recorded during testing with no apparent ill effects.