TRE center diff spool. Rwd ?

[Richardtsi411]

Is it possible to install the tre center diff spool in my awd tranny and take out my front axles and have the car be rwd ? I've heard of something like that but I couldnt find any hard info.

 

[GSX_Dan]

I have the same question.

Actually I'm also wondering about the actual power that would go to these 2 wheels. I know that they usually dyno the cars in FWD mode when a VCE is installed to force a 50/50 front/rear power split and a spool gives the same permanent power split. Wouldn't this cause the problem of only getting HALF the HP/tq to either the front OR rear wheels, depending which ones were still driving the car?

 

[OWGTI]

You can run it in RWD mode by removing the front axles and installing inner CVs into the transmission (to keep it from leaking) and outer CVs into the hubs (to keep the bearings together) and run it as RWD but you might pop a transfer case or if you dont have a 4 bolt, the rear end. Basically, think of an axle without the shaft. You still need the two ends in their respective positions.

As far as torque split, thats only true if all 4 wheels are driving the car then if the center differential is locked each set of wheels is getting half the power, or more accurately each set of wheels is responsible for putting half the power down. However, when you dyno it, you either have to have it in FWD mode, so then all the power goes to the fronts, or in AWD mode, so the power WOULD be split but BOTH sets of wheels would be on the dyno anyway and you would still get an accurate, but slightly lower due to more drivetrain loss, reading.

Hope that helps.

Later
Arnie

 

[GSX_Dan]

Thanks for that reply. So then it is correct to estimate only half the car's power is going to one set of wheels when you install a spool/VCE and remove one set of axles?

That's why I don't understand how they can dyno cars in FWD by installing a VCE because the front wheels would only be getting half the power. I mean it's not hard to multiply by 2 but for the sake of argument you're not showing the car's ACTUAL power to the wheels since there will be more drivetrain loss on the back wheels than the front wheels due to the extra gears/drifeshaft/x-case.

So making your car 2WD should equal 50% of your car's power?

If this is not correct can someone explain as to why, keeping in mind I'm talking about a welded differential/spool/VCE. Thanks.

 

[OWGTI]

no you are completely wrong. If you had read what I said, what you are assuming is only true if all 4 wheels are on the ground or on the rollers of an AWD dyno. Then the power is split. If you have a locked center diff but no power going to the front (or the rear) then that power is sent 100 percent to whichever wheels ARE on the ground/rollers.

later
Arnie

 

[GSX_Dan]

OWGTI: trust me, I read your reply and haven't found my answer. It seems you didn't read my reply as you haven't noted the fact that I'd like explanation why it works that way

Why would it make a difference if all 4 wheels were on the ground, or only 2 and the other 2 unhooked from the driveline? A locked diff will not care like a VC and only give 50% of the power to each set of axles from what I understand.

I guess I need an explanation that goes beyond "trust me, that's how works". Sorry if I'm being difficult, no attack is intended I just like to know how stuff works especially in this day and age when personal oppinions go as facts more often than not on these message boards.

Thanks.