[tomcat_f36]

Disclaimer: Ok, I admit it - my F36 has bumped me all the way back to kindergarten behaviour. I love a good burn out.

Obviously this is extremely counter productive (throttle and brakes at the same time) and stressful for the drive train.

However - EXACTLY how stressful? Will you break drive shaft/differential in no time doing this? If braking action is too hard will this be absorbed by clutch (automatic transmission). I guess I really want to hear all the kindergarten stories and your hands on experience.

Thanks!

[thejeremyman9]

DCT? What transmission do you have?

The answer is also highly dependent on your tires and the surface you are on.

[n55david]

Dct?

[tomcat_f36]

Originally Posted by thejeremyman9

DCT? What transmission do you have?

The answer is also highly dependent on your tires and the surface you are on.

My bad - it's automatic (corrected).

I respectfully disagree. The majority of stress on drive train will be from actually braking it. Next most stressful is a full grip case and finally least amount of stress - spinning tires (no braking). These are plain physics of friction.

[tomcat_f36]

Originally Posted by n55david

Dct?

My bad - automatic trans (corrected)

[thejeremyman9]

I understand that the coefficient of static friction is larger than the coefficient of kinetic friction. But how sticky your tires are is going to determine how feasible this even is in the first place, and its still going to play a role is how much resistance/stress on the drivetrain there is.

I've only powerbraked on a wet surface with my PS4S because they are way too sticky for a clean, dry road. I've done donuts without a problem (even open diff), although its much more difficult than with my previous tires (the S001RFTs).

The other thing you need to be careful of is wheel hop, there's more than i expected

[tomcat_f36]

Originally Posted by thejeremyman9

I understand that the coefficient of static friction is larger than the coefficient of kinetic friction. But how sticky your tires are is going to determine how feasible this even is in the first place, and its still going to play a role is how much resistance/stress on the drivetrain there is.

I've only powerbraked on a wet surface with my PS4S because they are way too sticky for a clean, dry road. I've done donuts without a problem (even open diff), although its much more difficult than with my previous tires (the S001RFTs).

The other thing you need to be careful of is wheel hop, there's more than i expected

Appreciate your feedback. Are you are absolutely right the stickyness of the tires plays a part in the stress on the drive train. I should have clarified I meant with a relative average street tires in dry conditions.

Now - peak stress on the drive train (no powerbraking) must be JUST before the tires start to spin - like during a WOT acceleration. I assume the manufacturer (at least to some extend) built the drive train for this kind of stress.

Question is how much more stress the powerbraking adds? Is it neglectable or does it bring the stress over the top?

Thanks for sharing your experience on wet surface.

I appreciate any other input on how much beating the drive train can actually take.

Thanks!

[thejeremyman9]

Originally Posted by tomcat_f36

Appreciate your feedback. Are you are absolutely right the stickyness of the tires plays a part in the stress on the drive train. I should have clarified I meant with a relative average street tires in dry conditions.

Now - peak stress on the drive train (no powerbraking) must be JUST before the tires start to spin - like during a WOT acceleration. I assume the manufacturer (at least to some extend) built the drive train for this kind of stress.

Question is how much more stress the powerbraking adds? Is it neglectable or does it bring the stress over the top?

Thanks for sharing your experience on wet surface.

I appreciate any other input on how much beating the drive train can actually take.

Thanks!

I generally agree with what you said but wouldn't really want to speculate and how much stress powerbraking adds in a quantitative sense. But to answer the last question, the diff and axles are pretty robust. People are running drag radials on prepped surfaces with launch control, for example, and driveshaft, axle, and diff issues being reported is quite rare here. The other consideration is the trans, which if you are talking about stock turbo application can handle the torque, but doing something like pwoerbraking will obviously generate a lot of heat, so i would be more concerned about that can say a 'instant' catastrophic trans failure from it.