Hello, H-T

I have recently purchased a 2005 Honda CRV RT4WD 5MT. I have been trying to find out the power ration for the rear wheels when the system is engaged? However, I am not able to find anything on the internet. Can anyone help me?

Thank you!

 

If you look at system design, it is essentially a 50/50 split. BUT, since there's a speed differential to overcome for activation it could be considered 0F/100R but theoretically impossible to achieve that due to all 4 wheels touching - something. Just curious, but why does it even matter?

 

Thank you for getting back to me.

The reason why I asked was because I was just wondering why the CRV have issues on roller test platforms. Is it just because the computer systems are trying prevent dual pump diff from overheating?

 

No, it's because of the exact reason I stated above. It has to have a slip differential to operate. Well if the front has loss of traction then essentially all power is being applied to the rear wheels. It really is a crap design in how it activates and why it isn't considered a AWD system hence the fancy Real-Time 4WD (RT4WD) labeling.

The computer has nothing to do with the activation (at least not 1st or 2nd gens), it is strictly mechanical and confined to the rear differential. There is an internal thermo-switch that will bypass fluid if the diff starts to overheat. The power is put through the front differential, to the transfer case, to the propeller shaft, to the front part of the rear differential. When a rotational speed differential is met, a clutch pack activates and couples the rear differential with the prop-shaft. This obviously applies power to the rear wheels.

So if you think about how it works, it's the overall design that makes it fail the roller test. The roller test is essentially a "zero traction" test where all 4 wheels have no resistance. Since the system operates off of front and rear wheel speed differentials it is essentially turning on and off continously inside the rear diff via hydraulics and doesn't gain any forward motion. In the real world there will typically always be some type of traction unless you are in the slickest ice or a deep mud pit... then you are probably screwed anyways with most vehicles that aren't true AWD or 4WD.

Cliffs: It's not a real AWD system, so be aware of that before you make bad driving choices.

 

Ah, I see. I got it.

Thank you for the detailed explanation! It helped a lot.

This link would also be a good read for those who have questions on RT4WD

http://www.hondasuv.com/members/show...and-4-Wheeling

 

You are welcome! Thanks for the link, I had some good laughs out of it - "Little is known about the transfer case up front..." - LMFAO!!!

However, it does do a decent job at overexplaining in layman's terms how it works.

 

If you can't explain it simply, you don't understand it well enough.
Albert Einstein

 

Point being??? If you read the link he provided, they explain things more than drawn out yet don't know how certain parts work. The system is so basic it's not even funny. The most involved parts are the hydraulics / pump portion, and it's nowhere near as complex as something like an automatic transmission.