Tomtwtwtw, that's the best answer so far. I forgot that it's not 1WD until traction breaks. Ok, so what you're saying makes sense especially since a track is nicely taken care of. However, why does 4WD help so much then, given your argument?

Don't know about your car, but the 08 and 09 cars use the brakes for traction control, at least in some of the driving modes, which are probably (?) disabled at the drag strip. My 98 VW GTI did the same thing.

I don't really see how you'd get double marked burnout marks, at least in normal burnouts, with an open dif. the longest burnout I did on an open dif was only 1-2 seconds, and it certainly was only 1 strip.

Mal.

 

The cobalt SS (all models, sc, tc, na) have equal length half shafts. So no matter what you do, an open differential car is still going to spin BOTH tires in a straight line. The LSD is not needed for drag racing applications in these cars. Deal with factual information.

 

I'm not sure what you mean here by dealing with factual information, but I assure you that nothing I've brought into this thread was non-factual. In fact, the only information I've brought in is questions, and notes about what i've experienced in the past.

It was not I who said that the half shafts were of any specific length.

Without question, my wife's 2002 Mazda Protege would spin just one wheel - now I don't know if that's caused by traction differences between the wheels or what not, but it's something I can easily duplicate.

So, perhaps you can answer a different question... What does equal length half-shafts have to do with spinning one wheel or both? I understand there are implications for torque steer, but I'm not sure about wheel spin.

Mal.

 

Most like to (deal with facts), but what you say isn't one of them. "have equal length half shafts. So no matter what you do, an open differential car is still going to spin BOTH tires in a straight line" is not really true. Given equal traction, it is a very high probability though. Put one in water/snow/ice/leaves/dust/whatever and you will see significant difference even in a straight line between LSD and open diffs. Of course, this is a "real-world" observation, not at a strip.

VV

 

VetteVirt, this is my observation as well (again, based on other open-dif cars), but not on the strip. Even on "nice roads" though I get this effect most of the time - probably due to tiny differences in traction between the tires. No idea if the equal length half-shafts would change the outcome though.

Still the fundamental question remains - if 4wd helps launching, why does 2wd with an LSD help over 1wd (open-dif). Somebody mentioned that and open-dif is not 1wd, which is true, but the tech used on my subaru was all LSD based, and we call that AWD - same tech, just more of them. It sure helped that car launch better. Why not ours?

 

When you went to the track were you using the no lift shift feature? If so, those times seem a little slow. Iam the first to admit that I am not the greatest driver in the world, but I was able to run 14.32 lifting on every shift and 13.88 not lifting 2.3 60ft both times. weather was hot here in florida also 94* 70% humidity. I am stock other than drop in K&N.

 

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



thanks for clearing that up. i haven't looked under the car yet to check the length of my shafts. but in response to others, yes the your shaft length does matter and not just in steering. even on the track, straight line, etc. if one shaft is shorter than the other, that wheel will recieve torque/power faster than the other wheel. and that torque and power will be slightly less at the longer end. so that one tire will initially recieve more power than the other until the LSD locks in and transfers power to the other side. a limited slip doesn't just automatically lock, it has to recieve power first. now an electronic locking diff or posi track doesn't have this problem. an open diff however will sometimes spin both tires due to inertia. (it's easier for that gear to turn with the other wheel than it is for it to just roll down the track, that's why some open diffs also spin both tires.) hope this clears up some stuff. i'm no genius nor am i trying to be, so if i'm wrong please correct me, i won't get butt hurt like some people.

later,

turb

i was faster without the no lift, as i got more traction without using launch control than i did when i used it. and it was about 90F with 95 percent. gotta love jville, nc. humidity is a bitch. i'm not dissapointed, i've been racing for years now, bikes and cars, and with a bone stock car, full tank of gas, and weather, i'm not dissapointed at all. i'm not going to make my car into a weekend warrior or anything either. i just wanted to see real times for my car and compare them to others. the local track is known for not putting out the greatest times either, so i know that has to play into the factor. my turbo busa runs about 1 second slower on this track that any other i've been on, also. i'm not worried about it.

later,

turb

 

from my own personal experience, big ass slicks that can catch traction at any given moment, my car has no LSD, and I spin both tires. I heat up both big ass slicks in the water box at the track, and then they both hook up hard when I launch.

That is the facts.

 

an open diff however will sometimes spin both tires due to inertia. (it's easier for that gear to turn with the other wheel than it is for it to just roll down the track, that's why some open diffs also spin both tires.)

that's why i said what i said. you either have a open or LSD. if you have an open diff i already explained it. if you have LSD then it's already been beaten. and maybe your car is just different than everyone's else's cars since cars have started being made. and how do you know that you don't have LSD? just because your number says you have it doesn't necessarily mean you do, it's been known to happen. and are you watching your tires as you take off? are they both spinning equal lengths? if they aren't then you probably have an open diff.

 

Marin i dont see how you ran a 13.97 but maybe you did idk i took it to the track on friday and ran a 14.286 1/4 2.19 60ft and 102.4 mph that run was perfect every way i pulled the dick out of a mach 1 but still marin i dont see how you got a 13.97

 

2.1 MPH greater trap. His car was making more power on that day than yours (obviously assuming everything else equal...which they never are).

Your times look good for 102.4 MPH power in a stock tired FWD. Weather difference?

VV

 

This is from the first time I went to the track with my SS/TC:
https://www.cobaltss.net/forums/drag-racing-52/my-08-cobalt-ss-tc-1-4-mile-runs-124362/

This is from the second time I went to the track with my SS/TC and ran 13.97@104.5mph:
https://www.cobaltss.net/forums/drag-racing-52/08-cobalt-ss-tc-1-4mile-runs-again-much-better-too-125240/

>>Note that on the night of my 13.97, OntarioKev was there and can confirm everything.

This is the link to the Official 1/4 Mile List where I am found under Stock SS/TC (Meaning that I submitted more than enough proof of my run):
https://www.cobaltss.net/forums/drag-racing-52/official-1-4-mile-list-114866/


If you have any more questions, I'd be happy to answer them.

 

do any of u guys think that second gear is really laggy ? i notice it alot at the track

 

I felt the torque management in mine in second, you could feel the car surging. I hate TM, does the same exact thing in my 06 Silverado when I gun it sometimes.

 

ran a 14.145 at 101.55 last night and my times wore getting faster 2009 bone stock with 1600 miles on it 60ft was a 2.260

 

is there any way to turn torque management off?

 

With tuning it can be turned off. That's why the guys with tunes have over 300 trq

 

ooo so u gotta have hp tuners to turn it off? damn i was hoping i could just turn it off right now so i can see what this beast really does!!