ok so i was sitting at a stop sign on a slight acually an extreamly slight uphill and when i droped the clutch my car bogged out then took off... has this happened to any1 else is it just case i was on a hill?

 

no it will do it even if ure on a straight away... it has done this at the track... i believe it had to deal with rpms climbing to fast

 

so its kinda hit or miss if im guna get a good take off?

 

were u in competitive mode using launch control? cause i know when im not and i havent turned off traction control, as soon as i spin a little bit, i loose power.

 

if u give it TOO much fuel it will fall on its face then shoot back up from all the unburned fuel and probably throw a few misfires..... basically its tellin you dont dump the clutch and it will never happen again

 

Is this a Cobalt specific problem? I rarely used the launch control cuz it scares me... (if nissan cant find a way to make it work in a $70k supercar why would GM have the secret in a $25k fasty box?) but at any rate... no matter how I launch I dont have a problem with bogging.. just wheel spin. No matter what. Which, quite frankly, is annoying.

Thinkin of some Falken Azeni's....

 

So in competitive mode we can rev at 3k and drop the clutch is that the whole point of competeitve mode?

 

Supposedly....

 

im on comp mode when i use lanch controll.

so i thought all i had to do was floor it and dump the clutch because the car automatically regulates the rpm's

 

i thought that too and it never worked for me..... i get better 60 ft times by launching at 2500RPMS and letting of the clutch lightly.... dumping seems to just spend tires

 

I've used launch control twice...once untuned and once tuned. You're supposed to keep the gas to the ground and it will hold the RPM's around 4900, you should here the engine bouncing there. You aren't supposed to dump the clutch so much as you're supposed "let it out with enthusiasm" haha, GM puts it some weird way...let it out quick but don't pop it.

Stock I could feel the computer trying to limit wheelspin but it was still pretty bad, no traction in first, I could launch much better without it...

Tuned it's a complete waste, I laid rubber till just after the shift to third.

I get much better results feathering the clutch from around 1500-2000RPM, just enough to get the turbo moving.

 

from what i hear about the skyline is they took off launch control cause their crappy trannys couldnt handle it, and apperently if u launch ur car, ur computer records it and ur warrenty is voided. this is just a rumor i heard dont know if its true for the skyline

 

I had similar results to what you had. The one time I tried using launch control, I ended up burning through most of first and I'm sure a good part of my clutch too. I get much better launches in the 2000-2500 range. If I'm at 3k or above, I have a wheelspin issue. Just below 3k seems to be the right mix of turbo spool and small lack of torque (in a good way) below 2500 that keeps wheelspin from happening for a second (since max torque comes on again after 2500 until 5300 in stock config) while getting a good launch off too.

I sometimes do the 1500RPM "launch" if I'm needing to get going quickly from a light to get around traffic or something and it's pretty ample too usually. Heck, if you're not trying to launch, I routinely do 900-1100RPM starts around town. This engine is great.

 

Yup, I completely misread the original article a few months back... Nissan released a new ECM program that adjusted each of the VDC modes, VDC-R mode is now slightly more aggressive at launch and is warranty friendly, VDC-OFF mode (what everyone calls launch control) is now much more neutered to reduce the stress on the tranny and launching repeatedly from VDC-OFF mode will void your warranty should the tranny happen to explode.

http://g35driver.com/forums/other-ca...l-revised.html (a link to a re-post of the original post from Edmunds and Autoblog)

 

I turn the esc off completely and hold it about 2500 and fether the clutch and I have no bogging at all

 

so gm basiclly made a function that dosnt work?

 

If we could reprogram it for something like 3k RPM, I think it'd be money.

 

well atlest i layed some nice rubber down where i launched it yesterday