ran a 15.08 with the launch crap, and ran a 14.6 with normal traccontrol, and a 14.9 with no traccontrol at all. bone stock, still got paper tags. got 1200 miles on it so i'm good. and i also had a FULL tank of gas. i didn't think i would run it, but then when i got there, peer pressure sucks. couple of guys from here was there too, aaronclark was there, and a couple other people. what's everybody else running fully stock?

later,

turb

 

Not bad for your first time. What did the rest of the slip look like? 60'? trap?

 

Check my sig for what I ran at the track

 

i'll try and find the slip, i think i threw 'em away. but yeah it was not my first time to the track, but first time in this car. i like that launch control on the street, but not at the track. it was garbage, plus the track is pretty crappy. i knocked off a second and a half by going to a different track back in south carolina, with my GTi, so i'm hoping that it had a lot to do with the track. none of the front wheel drive cars pull good times coming out of there. a buddy pulled a 14.something with a ss/sc with intake/exhaust. i was the only ss/tc there, oh well. i'm happy, for what i paid for the car, and to run a 14.6 with a full tank of gas in a bone stock car to me isn't bad.

rock on,

turb

 

well my first day running my car at a track i got a 14.27 @ 101 mph.. that was using launch control..

 

nice runs!!

 

what did u trap?

 

do any of you guys have lsd. Im interested in seeing if the lsd option makes a diffrens in the 1/4 mile

 

^^^, yea is the LSD that big of a deal? I have it but to me I can't tell the difference.

 

It is going to help a little in the 1/4, but it will help a lot when you are pushing it in the twisties.

 

Yah i know lsd is for handeling on the curves but how much diffrense would it make in a 1/4 mile my guess is very little

 

in my exp. lsd's help u *** outta the hole alil better...

 

13.8 stock just a deleted muffler. i do have lsd, but i dunno how much it helped, ohh and i have the driver mod.

 

LSD would help if you are spinning a lot. Minor or even moderate spin and it probably won't do a whole lot. It still allows a fair amount of slip between the two wheels.

 

So for a twisty track LSD is great, but for straights is ok. Hmmmm, spin a lot and it's great...hmmmm. Ok

 

im getting 15psi max turbo boost with my cobalt 2008 tc is this the norm

 

I think Bill Hahnran a 13.9 with a stock TC. Thats top of the line PROFESSIONAL driving however.

I think your 14.6 is decent. From what I pick up on... most members don't run 14 seconds flat. If you can get that to a 14.2 stock...your doing great.


Hell, I am still having a blast learning the ins and outs of driving a manual! I couldn't race someone or take it to the track if I wanted to... I would prolly stall on the line lol .

ummmm LSD is great for drag racing......

*facepalm*

the difference between what?

So you you have swapped out your LSD for a Posi trac and then put the LSD back in... ? (obviously I am being sarcastic here)......

Comparing a Cobalt with LSD to a different vehicle without it isn't logical grounds for comparison

 

1. Bill never ran his stock
2. Very true, most members aren't going to go 14 flat high 13 stock, most will be mid 14's.
3. LSD does nothing for drag racing.
4. facepalm some more, cause it doesn't
5. LSD helps in the twisties. When going in a STRAIGHT line, what the hell would the LSD do? Both wheels are going to spin, neither are going to see more traction than the other. You are going in a straight line.

Now I know this is an ongoing argument for years and years and years. So since you introduced your ideas and opinions, here are mine.

 

Hey, could you explain why LSD would not improve drag times? I'm no expert, but here's my thinking...

1. We all know that AWD helps you get out of the gate quicker, for better 0-60 times. That's 4 wheels potentially spinning for traction. Thus 4 is better than 1 (open dif).

2. I would think that 2 wheels (LSD) would be better than 1 in the same way as above (vs open dif).

3. The model that doesn't have an LSD will use the front brakes to simulate a dif, so the brakes will retard your acceleration to some point in my opinion. Of course, I suppose that function is disabled when drag racing?

4. In the winter, I'm positive that an LSD helps with traction, having driven both types side by side. Would some of that not apply to a summertime drag strip as well - just in a less obvious fashion (less drastic)?

Thanks,

Mal.

 

On ideal surfaces, both tires will have equal grip, and in a straight line an LSD should not be needed. Obviously, the more power you're pushing, the better chance you'll notice any difference in traction from one tire to the other, and the LSD becomes more necessary.

Imagine an open diff rear drive car with enough torue to lift the front tires. What happens then when one of the two wheels actually connected to the pavement loses traction?

The main purpose of the LSD in the Cobalts is for turns, but that doesn't mean it won't ever be useful anywhere else.

 

So, based on what you're saying, I would interpret that as "the only reason AWD cars get out of the gate faster than regular cars is due to traction differences between tires", and that if the surface was perfect, then a regular car would accelerate just as fast?

That doesn't seem right to me. However, there is a factor I just realized - weight transfer. At the start of accelleration front tires have more traction due to the placement of the engine. Later on, weight is transfered to the rear, so AWD transfers torque there. This optimized accelleration.

However, I'm not sure this doesn't answer my ultimate question:

"If 4 wheels (AWD) makes cars launch better, why does 2WD (LSD) not improve upon 1WD (open dif)?"

Thanks,

Mal.

 

another thing to think about is the length of your driveshafts, one is longer therefore taking up some of the torque than the shorter one. so no both wheels do not get the same amount of traction, no matter what.

later,

turb

 

Well the answer lies in that an open diff isn't 1WD. You're still putting power down to both wheels, but if one tire breaks loose, you're in trouble. If both tires have equal traction, there shouldn't be an issue. On a properly prepped strip, with the power these cars put down, the LSD is not going to significantly improve your times.

For what it's worth, my ss/sc never did a one wheel peel, even on the street, without the LSD. I could sure light up the inside tire with the wheel turned.

GM has engineered equal length half shafts in this car, as part of their effort to reduce torque steer.

 

what car uses brakes to simulate a dif?

i got an open lsd (05 2.2 balt) as far as i kno atleast and ive done burnouts 1-3 and see all equal length and darkness burnout marks........??? therefore not 1wd.... correct???

 

an open lsd?...