automatic launching [Merged 5-9] launch auto

[ypnas777]

i want to know the best way to launch an automatic . i dont want to be doing nuetral drops cause i just think those are bad for the transmission and i dont want to break anything cause im broke . should i just floor the car or what? i just want to know the best way to lkaunch an automatic without doing nuetral drops thanks

 

[tom1995tsi]

Nope. Around 3-4 lbs

 

[tom1995tsi]

^^^ thats the most i can get out of it.

 

[snowmansdsm09]

Get a high stall torque converter... otherwise your not gonna ever launch all that great unless you neutral slam it. Which is retarded !

 

[98TalonTSi]

Do not netural slam it at all...that is one of the worst things for your trans...
To take full advantage of your setup, you need to get a restalled torque converter, althought it shouldn't as bad as you're saying with a B16g....

 

[asexton6969]

Check for boost leaks. Always a first. My cuz would bog off the line and was getting a 3.1 60ft. Turned out a stud for his exhaust manifold was loose and leaking. Also his manifold to turbo gasket was cracked in two. Yea, needless to say he doesnt bog anymore

 

[vaboys2ndgen]

my 60ft times completly stock w/ a crack'd valve cover and bad plugs/wires. was 1.2 or 1.5 can't remember now damn . and that was powerbraking and launching at close to 3k. . .

 

[The_Baldman]

Get a high stahl. I'm running a 3800 and love racing the 5 speeds. I also have a boared over shift valve body and translab shift kit. Hold on to your seat!!!

 

[Eric_7810]

That doesnt make sense though. My 97 GSX with 3" turbo back, stock smic, 14b, injen intake can pull 14.6's @98 with a 2.2 60ft on pump gas. 3-4 psi doesnt sound right. If thats the best you can do after pulling out all the stops, I say get the stahl converter from IPT. Thats what I'm doing next spring.

 

[Eric_7810]

my 60ft times completly stock w/ a crack'd valve cover and bad plugs/wires. was 1.2 or 1.5 can't remember now damn . and that was powerbraking and launching at close to 3k. . .

Just curious as to what your 1/4 ET's are pulling 1.2 60 fts on a stock motor

 

[ChrisFlo]

my 60ft times completly stock w/ a crack'd valve cover and bad plugs/wires. was 1.2 or 1.5 can't remember now damn . and that was powerbraking and launching at close to 3k. . .

No they weren't.

 

[Mirage1]

I second that.

I fixed a few boost leaks over the last month. Went from leaving the line with 1-4psi of boost and bogging to leaving with 12-14psi. I was pulling 2.3 60ft times. Need to go and see how much of a difference it made in the 1/4!

Check for boost leaks and then datalog that sucker.

 

[dan2288]

How do you guys do it ? Ive tried reving the engine to about 5k in nutral and then slip it down to drive, but it didnt work out to good. Plus its probly bad for the trans. Is there another way ?

 

[burntheblobs]

I'd say the best way to do it is smash the brake to the floor, and floor the car. You'll build boost + rpms, and launch the second you let off the brake.

 

[LTUDSM]

I'd say the best way to do it is smash the brake to the floor, and floor the car. You'll build boost + rpms, and launch the second you let off the brake.

yeaah you deff right,i tryed this on my dads Caddy Esc i was holding 5500 rpm with the brake,and as soon as green light turned on i let off my feet out of brake pedal and it jumped really crazy i was surprised and i smoked my brothers talon fwd (346 whp) it was really funny

 

[SpeedAddict62]

yes, power braking is the correct way to launch a car with an automatic transmission. Hold the brake while giving some gas, and the engine will rev to the torque converter stall speed and hold there. This will pre-load the driveline, and reduce the shock on it when you launch. It should also load the engine enough to build boost. Hope this helps.

 

[dan2288]

ok, so i tried this today and it didnt rev past 4k while on the brake. Any ideas why ?

 

[2gAWDTalon]

ok, so i tried this today and it didnt rev past 4k while on the brake. Any ideas why ?

yes, power braking is the correct way to launch a car with an automatic transmission. Hold the brake while giving some gas, and the engine will rev to the torque converter stall speed and hold there. This will pre-load the driveline, and reduce the shock on it when you launch. It should also load the engine enough to build boost. Hope this helps.

Is 4K not good enough for you? You have a small turbo, that should work.
In addition, dont nuetral drop you car anymore.

 

[91 Eagle AWD]

Try doing it like this,the 2g has a TC lock. Buthttp://www.youtube.com/watch?v=rSs0ydtPumM I don't know what rpm it locks up at. The little rev is for vac. helps brakes hold

 

[silver bullit]

Yep dont Neutral bomb your car or you can buy a new tranny, also dont build boost off the line and hold it for a long time cause youll over heat the tranny. youll need to swap that turbo off for as better one to be a lil quicker but thats another story...

 

[dan2288]

yea, i cant even get the wheels to chirp or anything, but it is a awd so thats fine. Im sure when i get a 50 trim it will be better.

 

[91 Eagle AWD]

You will also need a big tranny cooler,to get it like that a/t in the vid. With the big turbo's you will have to hold it for some time. From a dig you need to brake boost, thats the only way to get a good 60ft time. Look at IPT's cars. Lee's is on fire!

 

[1GawdJunkie]

A lot of good info in this thread as well

http://www.dsmtalk.com/forums/showthread.php?t=65523

 

[Gs Dewd]

What would be the proper technique to launch a auto fwd car? When I try to launch the car I pull to the lights (tree), hold the break, bring the rpms up but it won't go past 2300 or so rpms. Also I see people talking about being able to launch under full boost with an auto but I can only get about 1 to 3 psi out of it while break boosting. I have also read about some people spraying at the lights (tree) to bring the boost and rpm's up but for some reason I am afraid to spray before the car is actually moving. Can the harm the car to spray while at the light? Any help would be great. I've also searched for launching auto's but did get much info on my problem.

As a side note my 60 ft times are in the hopper is why I am bringing this up. They are 2.5 to 2.8 which I know is what is killing my et.

 

[Gregory]

I don't have an auto, but I heard they are incredibly difficult to launch fwd. So, why am I telling you this? Because I don't want you to feel bad about having problems with it. haha I don't think you will be able to give your car more boost than what you are giving it though. The breaks will probably start to give before you can make more. And I don't think I would give an auto more rpm/throttle than that while holding it. Good luck!

 

[forcefed 95]

u might have to get a higher stall tourqe converter in order to raise your rpm's of the line. casue i think your factory tourqe converter wont let you break stand to build the kinda boost you want off the line.

joe