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

 

[vaboys2ndgen]

1st thing im seeing is that its a n/t turbo'd ? correct. i know the stall/trans would be different being n/t and turbo stock so thats probably a big factor in the only 2300 rpm stall. IMO rebuild the trans to include high stall coverter, talk to IPT see if they can help ya out any. they know transmissions better than anyone

 

[Gs Dewd]

I have a built f4a33 (turbo) tranny w/ a stock converter.

 

[vaboys2ndgen]

hmm.. high stall would help build up more boost thats for sure. but im not sure on the n/t w/ boost thing. i still consider myself a newb to dsms even though i've learned alot in over a year and half

 

[Gs Dewd]

but im not sure on the n/t w/ boost thing

Not sure what you mean by that. I swapped a 91' 6 bolt turbo engine into my n/t car if thats what your referring to. The car is the same as a factory gst now. Everything the gst came with my car now has and then some.

 

[forcefed 95]

im shocked you did not replace the converter with the trany. but anyway that would be the next step i would take is get rid of the stock converter and replace it with a higher stall. that will give you help ypu build boost out of the whole and inreturn get a better rt and and lowering your 60ft time.

joe

 

[Wizard]

On my old Laser FWD, I could easily and consistantly hit 2.0-2.2 60 ft times with street tires. However, this was with a 14b car with stock trans and converter. Building boost at the line was never a problem. 3" exhaust, ported 6cm housing, ported exhaust manifold, MT exhaust cam, 450cc injectors, Upper IC pipe, crushed and modded BOV, K&N and MBC set to 17psi. RS-A 225/50r16 tires.

Wiz

 

[vaboys2ndgen]

Not sure what you mean by that. I swapped a 91' 6 bolt turbo engine into my n/t car if thats what your referring to. The car is the same as a factory gst now. Everything the gst came with my car now has and then some.

guess i was confused, makes sense now sorry about that. but like stated before a high stall converter would be the next step as far as to be able to build up more boost, have you check boost leaks(could be why you cant build up more than 1-3psi) thats a guess though. (im just a driveway newbie mechnic...)

 

[Gs Dewd]

guess i was confused, makes sense now sorry about that. but like stated before a high stall converter would be the next step as far as to be able to build up more boost, have you check boost leaks(could be why you cant build up more than 1-3psi) thats a guess though. (im just a driveway newbie mechnic...)

As far a building boost I can only build 1-3 psi brake boosting after I launch the car it has no problem building 17 psi (which is what I have the mbc set for).
Wizard my setup is as follows 3" custom exhaust, no ported o2 housing, turbo header, comp 101200 cams, 550 inj., Dejon tool ic pipes, stock bov, mbc set @17 psi on a 16g, k&n, 205-55-16's I can't build full boost by brake boosting only 1-3 psi and as I said before 60 ft times are 2.5 to 2.8.

 

[forcefed 95]

Like i metiond before you will need a higher stall converter or i would look into getting a trans brake. Trans brake will def help out just as much as changing your converter.

But becasue of your stock converter once your hit 2300rpms it wont raiseany higher casue the trans wants to move the car,but with the brakes applied the car wont move so your rpms wont raise. Unlike a manual trans you cant slip a automatic to raise your r's. So once you hit 2300 your at a wall until the car can actually move. cause at 2300 the coverter is wantin to put power to the ground and your not letting by holding car in place. and where as with a higher stall you will be able to do a brake stand casue the converter wont transfer power until a higher rpm which will allow you build more boost. I hope this kinda helps you understand alittle bit more as to why you can't laucnh as hard off the line as you would like. Any more questions please feel free to ask.

joe

 

[Gs Dewd]

I kinda figured that, but why I am so puzzled is that I been reading on here and others like Wizard who posted a couple of posts up where able to build full boost on the stock converter while brake boosting.

 

[vaboys2ndgen]

i know on a 2g i was able to brake 3000rpm which was 20psi(w/e i had the mbc set at) so need to figure out mechanically why your trans is stopping at 2300. and i've come outta all my few ideas. sorry bro

 

[forcefed 95]

Not to sure just an idea is there a difference between the n/t tcu and turbo tcu and if so did your replace the tcu for the turbo trans.

joe

 

[Gs Dewd]

I changed the tcu. Just stumped right now on this. I have been comptiplating in the back of my mind on doing a 5 spd swap but then I run into the traction issues that come with that. Right now the car hooks good out of the hole. With the 5 spd I know it will spin like crazy.

 

[edenTSI]

i run a auto AWD.. i brake boost and it revs to about 2500 at 7-8 psi. i launch like craaaaaazy but thats cause i'm AWD

higher stall converter would do that trick. im thinking about upgrading mine also

 

[costas14]

Just wondering, but how do you launch an awd with an automatic?

 

[1992awdlaser]

Hold the gas and brake. Let go of the brake when you want to go. That is basically it.

 

[giovanniv]

I don't think that there is really a specific way to launch an auto. Look on youtube and put in how to launch an automatic and there will be a few eclipse videos 1st and look at them.

There are some people that press the brake a little. others use their ebrake and some other people do a neutral drops but that is not a smart move to do at all.

 

[pSimytSi]

you can read this if you havn't already.

http://www.dsmtuners.com/forums/automatic-tranny/149511-post-how-you-launch-your-automatic.html

 

[costas14]

i saw that post, mainly looking for advice on the awd system so i dont lock it up

 

[spawn7037]

some other people do a neutral drops but that is not a smart move to do at all.

I've heard of a few people in my area doing neutral drops for drag, helps spool the torque converter, but I don't think its really nessecary for daily driving.

 

[pSimytSi]

So the holding the brake and bringing your rpms up until the turbo is ready to boost is your best option. You can do this with the shifter in 1st if you like shifting it yourself. Just be ready to shift up quick, around 6500 rpms or so as there will be a slight delay in the upshift. Practice this a few times and learn what feels best for you and your setup.

 

[giovanniv]

I've heard of a few people in my area doing neutral drops for drag, helps spool the torque converter, but I don't think its really nessecary for daily driving.

I dont think it would be a very good thing to be doing on a daily basis because of your trans getting messed up.......

 

[interex]

Neutral Drop is a bad idea, it will ruin a transmission in no time. Brake torquing is the best way to launch an automatic, you can even buy a Line Lock Kit, or Roll Kit for launching an automatic just like most "strip/drag" racers use. I can't believe this thread has continued on this much, it isn't something that needs to be mastered on an Automatic.

 

[DSMDemond]

If you like driving your car do not neutral drop it....You will BREAK stuff!Look into a stall converter.You can raise your rpms and your boost levels at launch.This will drastically help an auto car launch.Or do a 5 speed swap!

 

[interex]

If you like driving your car do not neutral drop it....You will BREAK stuff!Look into a stall converter.You can raise your rpms and your boost levels at launch.This will drastically help an auto car launch.Or do a 5 speed swap!

As far as I know, there are only 2 torque converters made to fit the DSM.

1 custom high stall from IPT for $520
1 9 1/2" Billet multi-disc Lock Up from IPT for $1200