Launching the Automatic - Brake Starting
06-14-2007, 01:09 PM
#26
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can you shift fine from L to I to D?
ive never tried this yet, but i prolly will soon.
and when u shift do you just let off the gas or what??? ive never really tried doin this stuff in an automatic... i used to drive a stick. but my cobalt is auto
ive never tried this yet, but i prolly will soon.
and when u shift do you just let off the gas or what??? ive never really tried doin this stuff in an automatic... i used to drive a stick. but my cobalt is auto
06-14-2007, 09:32 PM
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06-14-2007, 09:52 PM
#29
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For 1/4 mile racing you wont need to use 4th gear, so leave it off "D",
Mash the petal to the floor, start in "L" and shift up to "I" when you top out first gear, the automatic will do the rest.
The only reason you would need 4th gear is if your getting in excess of 95+mph. And you seriously should not be racing that fast in an auto 2.4l. The only cars you are going to beat at 100mph in our SS/NAs aren't worth racing.
You won't get an impressive one, but try this brake starting technique that Halfcent described, You'll drop about 2500 rpms straight on the tires then you can go WOT, should let you squall rubber for at least a second or two.
Mash the petal to the floor, start in "L" and shift up to "I" when you top out first gear, the automatic will do the rest.
The only reason you would need 4th gear is if your getting in excess of 95+mph. And you seriously should not be racing that fast in an auto 2.4l. The only cars you are going to beat at 100mph in our SS/NAs aren't worth racing.
You won't get an impressive one, but try this brake starting technique that Halfcent described, You'll drop about 2500 rpms straight on the tires then you can go WOT, should let you squall rubber for at least a second or two.
Last edited by monkeiboy; 06-14-2007 at 09:52 PM. Reason: Automerged Doublepost
06-14-2007, 09:59 PM
#30
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No E-brake needed? Because this kid at school has an old corolla and he pulls the ebrake and sits there smoking the hell out of his tires on dry pavementand then with my car you get a little chirp if I'm lucky.
06-14-2007, 11:05 PM
#31
I'm old school
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Whoa, whoa. The last several posts are all very wrong.
dbs88: Just read the first post and do what it says. There is nothing more to it. Just like Sushidog said.
Monkeiboy: Very wrong stuff there. You will need 4th. You select "I" or "2" AFTER the car has shifted to 2nd, not at the top of first. And there is no reason not to select "D" after the car shifts to 3rd. You most certainly can get a good burnout in these cars. Put the tires in the box, lock up the parking brake, and brake torque it to stall, then release. The wheels will burn indefinately, it will even shift to 2nd and keep spinning.
dbs88: Just read the first post and do what it says. There is nothing more to it. Just like Sushidog said.
Monkeiboy: Very wrong stuff there. You will need 4th. You select "I" or "2" AFTER the car has shifted to 2nd, not at the top of first. And there is no reason not to select "D" after the car shifts to 3rd. You most certainly can get a good burnout in these cars. Put the tires in the box, lock up the parking brake, and brake torque it to stall, then release. The wheels will burn indefinately, it will even shift to 2nd and keep spinning.
06-14-2007, 11:12 PM
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Whoa, whoa. The last several posts are all very wrong.
dbs88: Just read the first post and do what it says. There is nothing more to it. Just like Sushidog said.
Monkeiboy: Very wrong stuff there. You will need 4th. You select "I" or "2" AFTER the car has shifted to 2nd, not at the top of first. And there is no reason not to select "D" after the car shifts to 3rd. You most certainly can get a good burnout in these cars. Put the tires in the box, lock up the parking brake, and brake torque it to stall, then release. The wheels will burn indefinately, it will even shift to 2nd and keep spinning.
dbs88: Just read the first post and do what it says. There is nothing more to it. Just like Sushidog said.
Monkeiboy: Very wrong stuff there. You will need 4th. You select "I" or "2" AFTER the car has shifted to 2nd, not at the top of first. And there is no reason not to select "D" after the car shifts to 3rd. You most certainly can get a good burnout in these cars. Put the tires in the box, lock up the parking brake, and brake torque it to stall, then release. The wheels will burn indefinately, it will even shift to 2nd and keep spinning.
06-14-2007, 11:20 PM
#33
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At the track they shoot thru first, hit redline, then the car automatically cuts the throttle for some stupid reason
06-15-2007, 09:38 AM
#36
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Whoa, whoa. The last several posts are all very wrong.
dbs88: Just read the first post and do what it says. There is nothing more to it. Just like Sushidog said.
Monkeiboy: Very wrong stuff there. You will need 4th. You select "I" or "2" AFTER the car has shifted to 2nd, not at the top of first. And there is no reason not to select "D" after the car shifts to 3rd. You most certainly can get a good burnout in these cars. Put the tires in the box, lock up the parking brake, and brake torque it to stall, then release. The wheels will burn indefinately, it will even shift to 2nd and keep spinning.
dbs88: Just read the first post and do what it says. There is nothing more to it. Just like Sushidog said.
Monkeiboy: Very wrong stuff there. You will need 4th. You select "I" or "2" AFTER the car has shifted to 2nd, not at the top of first. And there is no reason not to select "D" after the car shifts to 3rd. You most certainly can get a good burnout in these cars. Put the tires in the box, lock up the parking brake, and brake torque it to stall, then release. The wheels will burn indefinately, it will even shift to 2nd and keep spinning.
3rd gear will take you safely up to 95 or so MPH. If you shift into into "D", you car will shift out of third at some point, no matter how much throttle you have on. For racing purposes, it would be better to stay out of the overdrive gearing unless your engine is redlining.
And I apologize about the burnout, MY car has a torque limiter when my parking brake is engaged (same as the brake start). It goes into limp mode if I try to gun it while the parking brake is on (I tried
). I just figured everyone elses was that way too.Same as that, but mine doesn't hit redline
Last edited by monkeiboy; 06-15-2007 at 09:38 AM. Reason: Automerged Doublepost
06-23-2007, 08:16 PM
#37
The 4T45E has an open differential. Brake starting will probably result in one wheel spinning while the other one stands still. Without an LSD, you will need to practice your starts and vary your brake torqued throttle launch speed to get good launch traction.
2 things:
1.) 1 wheel, wtf? Being a noob I don't understand why
2.) I don't really get the second sentance
2 things:
1.) 1 wheel, wtf? Being a noob I don't understand why
2.) I don't really get the second sentance
06-23-2007, 10:36 PM
#38
I'm old school
Thread Starter
To understand, you have to understand what an open differential is. It's the gear set that delivers the power from the transmission to the actual drive shafts. It's designed so that one can spin while the other doesn't have to. That allows the wheels to spin at different speeds, which is necessary to turn a corner.
When you spin the tires on a drag launch, it is normal that one wheel will lose traction first instead of both at the same time. So, once that wheel starts spinning, it will continue to do so unless you let off the gas a little bit and let the tire regain traction.
When you spin the tires on a drag launch, it is normal that one wheel will lose traction first instead of both at the same time. So, once that wheel starts spinning, it will continue to do so unless you let off the gas a little bit and let the tire regain traction.
06-24-2007, 07:37 PM
#40
I'm old school
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Yes. Engineered Performance modifies stock units into LSD's. However, installing it is a huge job requiring taking your transmission completely apart.
06-27-2007, 06:26 PM
#41
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might be a EXTREMELY DUMB QUESTION, but in my car, the gears on my shift say,
1,2,D,N,R, then P.
im gunna guess that this L and I everyone was talkin about on page 2, those are 1 and 2 on my car?
1,2,D,N,R, then P.
im gunna guess that this L and I everyone was talkin about on page 2, those are 1 and 2 on my car?
07-05-2007, 10:08 PM
#43
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You mentioned that it's not a bad idea to add in another tranny cooler. I may have missed this someplace, but:
-is there a GMPP version of this
-how 'cheap' are these things
-how much does brake launching fu[k up a stock balt?
-is there a GMPP version of this
-how 'cheap' are these things
-how much does brake launching fu[k up a stock balt?
07-05-2007, 10:40 PM
#44
I'm old school
Thread Starter
No GMPP cooler. They are generic in nature, and several good companies make various models.
$50 outta do it
It won't mess it up at really as long as you don't stand on the stall and cook your fluid. Torque it, release it, and the worst thing you are going to do it leave behind some rubber.
$50 outta do it
It won't mess it up at really as long as you don't stand on the stall and cook your fluid. Torque it, release it, and the worst thing you are going to do it leave behind some rubber.
07-31-2007, 09:50 AM
#48
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haha, i tried this last night while driving with my friend. I took off and we were headed down the road neck and neck and then I was like "WTF! Why's he slowing down?" then i realized i was about to hit a redlight at like- 102.
long story short i stopped the car at the right spot, but the brake launch was a blast. did leave a faint burnt smell under the hood though (and two big piles of rubber at the start and stop)...
long story short i stopped the car at the right spot, but the brake launch was a blast. did leave a faint burnt smell under the hood though (and two big piles of rubber at the start and stop)...
08-14-2007, 10:06 AM
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haha, i tried this last night while driving with my friend. I took off and we were headed down the road neck and neck and then I was like "WTF! Why's he slowing down?" then i realized i was about to hit a redlight at like- 102.
long story short i stopped the car at the right spot, but the brake launch was a blast. did leave a faint burnt smell under the hood though (and two big piles of rubber at the start and stop)...
long story short i stopped the car at the right spot, but the brake launch was a blast. did leave a faint burnt smell under the hood though (and two big piles of rubber at the start and stop)...