I cant spin my tires.....With VDC off, I rev up to 3.5k-4k RPPM droped it and got nothing but bouncing or axle hop or something......is this bc of my tires BFG T/A KDW 245/40?
-stock except for POP Charger

 

I have those same tires in my rear and experience somewhat of the same problem. Although, under the right circumstances they will spin, but i have a few more mods than you.

lol i know it looks really badass to do burnouts and such, but just remember that you are burning tires needlessly. you are faster when they are not spinning.

Im going to 275/40/18 in the rear and moving my 245's to the front.

are the tires warm or cold when u are trying to burn?

 

Say hello to the LSD located inside the pumpkin.

 

they were cold...its my second time to try and do a burnout with these tires....first time resulted with the same problem....ive put roughly 8,000 miles on these tires so far without a burnout....its just not as fun when new tires run $900. Stock tires i had no problem spinning but im guessing these get incredible grip

 

Why would anyone subject their car to that kind of abuse, trying to make it do something that the engineers designed it to prevent?


NOTE: Superior traction is an ADVANTAGE, not a "problem".

bill

 

thats why they make switch to turn the traction off....you might not know about this

 

It's not the tires and it's not the traction control button. It is probably the lsd in the rear diff of your z. Mine does it at times. But I don't burn out a whole lot.

 

Im pretty sure you'd get more traction in a launch w/ spin than w/ wheel hop. Wheel hop is retarded in this car. I can do a burn in my neighbors porsche MUCH easier. Not many people have figured out what it is yet.

 

im not familiar with the lsd...is this a problem that i need to fix, or is this normal

 

dumping the clutch doesn't cause a spin. Wow, thats a good thing. All Launch!

 

It's normal, limited slip tries to "limit the slip", hence the name. Just dont do it a whole lot it's not good for the lsd. you can do some research on lsd's and the different applications they possess. It's kinda interesting.

 

ok great sounds good...i know traction is important and all but i dont race. I wasnt trying to do a burnout either, rather just spin the tires off the line, sorry didnt want to make it sound like im abusing the car.

 

I just wouldn't make it a habit is all w/ the stock lsd. LSD is your friend.

 

thanks for your help guys

 

Wheel hop is common for vehicles with independent rear suspension. The tires grab, spin and grab. And sometimes the suspension reacts violently. For tips to avoid wheel hop ask members here who are running 2.0 second or better 60-foot times on street tires: https://my350z.com/forum/drag/233840-top-25-1-4-mile-times-for-tt-st-supercharger-nitrous-bolt-ons-stock.html

 

First off, someone said burning out is bad for your LSD. That is not true. It is hard on your tires first, then your motor second. Want to know what's bad on your LSD? Racing with slicks and not getting ANY tirespin (guess where all that power is going? Not being dispersed to the ground via burnout anymore)

What you're experiencing is wheel hop combined with power being limited to your rear wheels. Some say that TCS is still on even when the button is off in the 350z. I'd have to agree. Otherwise you would probably fish tail a lot more launching. It's not an IRS thing. I don't think '03 + cobras have problems with burning out, and they have IRS.

 

Stabber, VLSDs do have a limit to how much they can take compared to mechanical LSDs. Once you have more grip than it was designed for it starts overheating and the fluid breaks down and quits doing its neat trick then you have a open diff.

TCS is off when it is off.

To the OP, VDC equipped cars also have BLSD (Brake LSD, you can read about it in the manual) that will apply brakes to stop tire spinning making spins more difficult. There is also a "feature" where the ECU will cut power if you hold the brakes and gas, for a standing burn out, but that is another story.

A while back there was a thread about how to really disable VDC by cutting power to the yaw sensor, most people agree that is the best way to really turn it off but I don't know if that also turns off BLSD.

Wheel hop and IRS are not immediately connected but most IRS setups are designed for traction in real and track type driving, keeping the wheels planted in hard turns. The focus on launching is minimal as most driving and racing for that matter does not rely "dumping the clutch" style starts.

As in most designs, there are always trade offs.

Chris

 

It doesn't? I run 235s in the rear (not the stockers though), and if I dump the clutch at 5k, they are GOING to spin all the way through 1st without any problem.

 

Its the tires. I run the same tires, 235-40-18 on my car (Not a Z, and it is FWD) and while I have absolutely 0 trouble breaking the tires loose (2500rpm clutch drop will smoke the tires all the way through 1st and into 2nd), I cannot do a burnout because the tires will only hop. This is a bad thing, because wheel hop sends massive torque spikes back up through the drivetrain, and can destroy parts. I know this first hand, as I wasted a differential doing this on a drag launch at the dragstrip. It is because the sidewalls of the tires are so stiff and the tires are so grippy. As was said, it is a typical problem for IRS, which I think is a primary reason for the Mustang STILL having a live rear axle, since most Mustang enthusiasts will only drag race them.

So, the moral of the story is, if you want to do a burnout, put on some tires with a huge sidewall and no grip

 

That switch only turns off VDC/TC. It does NOT turn off the limited slip.

...you might not know about that.