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Traccontrol or lsd in 4wd?

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Matt777, Jan 9, 2020.

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Feb 11, 2020 at 8:04 PM

#61

#61
ShimStack Well-Known Member

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Mar 11, 2012

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Ben

NC

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'91 Truggy, '98 Project, '16 DC OR M/T Locked F/R

gudujarlson said: ↑

Ok I did some experiments late last night where I paid close attention to the TRAC/LSD operation indicator, throttle position, and engine output. First I found a nearby hill and drove up onto a snow covered curb such that the passenger side wheels were in about 6” of plowed snow and the driver side wheels were on semi-dry pavement. Stuck she was.

In 2wd normal mode the TRAC operation indicator flashed constantly as the passenger rear wheel spun. The driver side wheel did nothing or very very little. I could not feel any forward motion. I also noticed that engine output was dramatically limited even though there was no yaw. I stayed stuck.

In Auto LSD mode the Auto LSD operation indicator flashed repeatedly as the passenger side rear wheel spun. The driver side rear wheel pushed the truck forward in a quick on-off pattern. Engine power was not limited. The more I pushed the throttle down (up to a point) the faster the truck moved forward. I got unstuck.

I tried the same thing in reverse with basically the same results.

Conclusions:

TRAC does operate when stuck. It just doesn’t do a good job of getting the truck unstuck.

TRAC operates in reverse.

TRAC and/or VSC limits engine output even when there is no yaw. The wheels just need to be spinning. Maybe that was obvious to others, but it wasn’t to me until now. I’m not sure if it’s TRAC or VSC doing this. Or maybe they are really just two modes of the same system.

Auto LSD seems to be a bit more aggressive at applying the brakes in addition to not limiting engine output.
Click to expand...

This is a good test for everyone to try. I believe it was TRAC cutting your engine output as TRAC is known to utilize engine cut along with wheel braking to reduce power induced rear wheel slip. VSC should not have been active as the expected yaw rate would be zero since vehicle velocity was zero. VSC will definitely react to instances of zero yaw, but only if it EXPECTS yaw. In this case it should've expected zero yaw and sensed zero yaw.

Remember, TRAC intervenes only to correct wheels that are getting engine power from slipping. VSC intervenes to keep the vehicle on its intended path. Auto LSD will not cut engine power while intervening to correct driven wheels slipping across the axle.

ShimStack, Feb 11, 2020

#61

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