RJC

From the videos I've seen it appears the E55 will leave two nice black strips of burnt rubber, but how does it leave 2 without a LSD?

Just curious

jangy

Straight line, I get enough *** into each tire to get 2 strips. the difference is that it is not placing max power down with each (i.e. it doesn't leave two nie deep grooves in the pavement). Also, it doesn't do it nearly as nicely on turns.

RJC

How do both wheels spin together without the LSD?

newton22

Raw power. LSD only locks the differential. A slick surface and some nice torque CAN make a car spin both its wheels without LSD.

Grumpy666

E S P

RJC

I think you're right.

tommaey

ESP
ESP will apply braking force to the wheel which slips, transferring power to the other wheel.

rflow306

It has nothing to do with esp the car will do it with esp off and even in dyno mode. It has to do with the way our open diffs where designed. On an even surface the weight and torque transfer is almost identical hence the solid two stripes. Why do you think the battery was placed in the right side of the trunk and the smaller backup battery in the right side front? The reasons are preload and weight distribution to offset the driver. I think mercedes did an excellent job with this part of the car.

It all comes down to, that unless you are going to be road racing your car an lsd has no real world benefit. This can be easily checked by doing a comparison of et's between stock and lsd equipped cars.

Blue Arrow

I drive a right hand drive version, the batteries are in the same location as on the left hand versions.

tommaey

...
I'm not saying its impossible to spin both wheels with an open diff, but to say it has nothing to do with ESP? You can feel it happening with ur *** cheeks

rflow306

Good point totally forgot about that. It would be interesting to scale the car to see what the differences are between US and Europe, ie put the car on four scales weighing each individual corner.

I repeat, ESP has nothing to do with it put the car in dyno mode and it will leave two fat tire marks. ESP is for traction control once the car detects a hint of wheel spin.

E55 RUSS

Gees...I thought I would see some Crazy BURNouts it these topic...

Common guys...We need more FUN...Do some bunsouts with LSD and without and we compare

Blue Arrow

What is dyno mode? Did a search but can't find anything.

AMG_55

i did them in dyno mode (esp AND asr OFF)

m5 rus asked for it so here it ishttp://videos.streetfire.net/search/...FB2673B440.htm

anerbe

any open rear diff car with high horsepower/torque will put down two black tracks. People tend to forget that an open rear diff does not send power to one wheel or another. It sends it to both wheels equally, assuming that both the rear tires have the same tractive forces on the ground (equal weights (N) and equal coefficient of frictions (U)). So, if the U*N (left rear) = U*N (right rear), the car will burn out equally. If one side happens to change the U to a lesser amount, the open diff will send more power to that side. I.E. if the left rear wheel hits water, that will spin more.

Grumpy666

As anerbe pointed out, you can leave two stripes with ESP off - it requres the unique situation where traction for both rear tires is equal. With ESP on, you will leave two stripes, independent of traction conditions (within reason).


The preload to the right rear tire is a function of the engine's torque transfer to the car's frame (think gyroscope). If the engine spun in the opposite direction, the left rear would need the preload.

rflow306

Any independent suspension open diff will spin both tires a solid axle will not. Hence the term one wheel wonder.
Like you mentioned in the formula, on a flat surface the force being applied to the tires is equal.

Grumpy the car will not spin the tires with esp on. The car applies the brakes and will not let you roast the tires. Even under a heavy downpour.

Grumpy666

A car with 500+ lb ft of torque should be able overpower the rear brakes. Does ESP also limit power output in this situation?

rflow306

yes it begins with the brakes then kills engine power if needed. I believe it also closes the throttle-body since its throttle by wire.

Time for some experimenting. I will data log with esp on and see what else it controls.

anerbe

IF ESP could be switched on so it only measured the relative rotation of the rear wheels only, the car could in turn act as if it has a limited slip. It could brake the spinning wheel, adding resistance to that side, transfering load to the other wheel, equalizing spin. However, since the ESP applies to all wheels, the car kind of does this, but at the same time, it will kill power to the whole rear when it senses the rotational difference between the rear and the front. The rear only approach is often used with "traction control" for acceleration. Often times, race vehicles would have this ability.

In other words, ESP will help with equalizing rear load, but will cut power completely when it senses the rears spinning faster than the front.

E55 RUSS

Wow..thanks man...It would be better if he would actually launch the car