I got the tail to wag a few times going into 3rd with VDC off... You just got to take it easy unless you want to have fun.

Like stated a tire change won't do much as these stockers are pretty well balanced.

coming from driving a 240sx without any driving aids for a few years these RWD platforms like to kick out a bit when you are a little to aggressive with it. It requires a bit a finesse and a whole lot of getting used to! :twocents: :driving:

-Scott

You live in Manila. It's like 120F there all the time and the tarmac is probably 150F. Your tires were nice and gummy before you even started driving!

I can always get VDC to kick in when I punch it at any point in second and many times while I am in third gear as well, but a lot of this is due to my base open differential I believe. Wider stickier tires will definitely help in many ways, that is my plan to gain some grip next year.

I've seen the VDC light up accelerating at WOT on the 1-2 and the 2-3 in fairly warm weather (75?) with tires warm after 15 minutes of curved driving using the paddles.

For a low (ish) torque car, it does pretty good :)

Blowing the tires off with 270 fwtq when you floor a car in 2nd gear isn't what I would call a good thing. I am curious if anyone knows the stock spring-rates on the Z? It has to be a suspension deal, the tires on those cars are not junk and 75* is not cold.

EDIT:
FRONT:
OE rate: Linear 74 N/mm (422 lbs/in)

REAR:
OE rate: Linear 79 N/mm (450 lbs/in)

Found this. Not really that stiff. I dunno why these cars are so traction-challenged. With their weight, balance, power, and tires, they shouldn't spin this easily. I noticed the same thing in my friend's 'vert. Hitting it in 2nd would light up the VDC. Rediculous.

You need to think about gear ratios. for the manual 2nd gear is 2.324 w/ a rear final drive ratio of 3.69. multiply those to get your absolute gearing = 8.576. Multiply that time the torque the engine is producing. 270lbs @the crank at 5200rpm. This makes a grand total of 2315.3 lbs/ft so I guess I that is were tire slick comes from.

3rd gear is 1.624x3.69= 5.992x270=1617lb/ft.

the 96 trans am w/ 6sp manual makes 325lbs@2400 (according to MSN.auto) 3.42 final ratio (there was also a 2.73 rear ratio) and 1.78 ratio second gear. make total torque multiplation of 1978lbs@ peak torque in second gear. If you hit it hard and are above 2400 you will have less torque.

I know theres torque numbers aren't real world numbers but they are the best I have to work with. And it is more about the principal then the actual figures.

The 7AT has even more effective torque due to its gearing (I have a spreadsheet I haven't posted on it yet...)

Since the torque curve is so flat, the car makes around 200 rwt from around 2500 RPM to 6500 RPM, so the 7AT has 3300 in 1st, 2141 in 2nd and 1370 in 3rd versus the manual's 2800 in 1st, 1713 in 2nd and 1196 in 3rd. With the heavy flywheel/rotational mass of the 370Z's engine, that makes wheelspin at shifts even more likely. Even assuming a cf of 1.5, seems like we have enough force to spin.

You guys are a bunch of nerds. :icon18::tiphat:

I think you have nailed it! Good points!