mattg

how our open diff auto trannys spin both tires on take off? i thought they did but i didn't have any proof until this vid.

TypeS_boi

that sg's car? tires must be bald or that 3.5 really makes a difference. Good stuff

Allout

Matt,

I was talking to Dean Beatty this afternoon and I asked him if he ever considered putting in an LSD into his tranny if he needed to replace or upgrade his auto. He mentioned that out of the tranny upgrades that they done, the trannys did already have LSD's in them. That was something that I wasn't aware of also.

bigguyonbike

yesterday i did a burnout just for fun after the dyno and notice the same thing. two parallel tracks for a good couple yards. maybe the auto has some kind of LSD???

ChadT

On a front wheel drive car the 2 front tires are fairly evenly loaded because the engine and driveshafts are setting sideways and the torque is pulling front to back. Every front wheel drive car I've had would spin both tires if it was facing straight ahead on even pavement. Try gunning it while turning a sharp corner. The inside wheel will spin due to the different speeds of the wheels. Rear wheel drive cars usually spin one wheel going straight because the torque of the engine tends to unload one wheel.

WILLDOGS

I've noticed the same thing with my CL-P

both spin on burnouts

darrinb

i remember laying down 2 lines w/ mt stock tires, i've taken easy on my new ones so far

EricL

With FWD:

When you accelerate, you lift the front. More force == more weight transfer from front to back.

If one side of the car is putting down MORE power (more of motive force/traction), that side will lift due to the increase force from that side (some of this would depend on the stiffness of the chassis and sway bar etc). This would manifest itself as a yaw and as a change in front-to-rear pitch. As one side lifts it's front up -- due to gain of traction -- it is going to unload the tire. There is a sort of negative feedback loop going.

CAVEAT: The "theory" has limits -- and doesn't account for every possible FWD configuration. IOW, if the car has a very "slippery" diff, very sticky tires, different suspension, very high roll resistance, etc, etc -- it may not apply.

Other issues:

Once the tires are spinning, there is a certain amount of friction internal to the diff and car that is going to be weighed against the less-than-spectacular traction of tires when they are spinning. I've seen RWD cars with open diffs. leave a short set of parallel patches.

So, here's an old thread:

http://www.acura-cl.com/forums/showthread.php?t=43793

Take your pick:

1. Internal friction vs. that of the tires spinning/slipping.
2. FWD weight transfer/yaw/pitch.

AND or combo of 1 & 2.

kHmER Co

i think our cars have the 1.5 differential similar to the itr

EricL

The auto has an open diff. I'm looking at the helms and its OPEN...

The 6-speed is another matter...

The page clearly shows 4 pinions and that's it: no cluches, and it isn't a HLSD or other type of LSD.

SCTL-SS

This is a mystery to me as well. When I had my stock auto(2002 TL-S) only the passenger side would burn out. After I did the VR tranny, which came out of a 2001 CL-S both tires burn out???
Whatever the case maybe I certainly need both tires to pull now more then ever.