Best Launch RPM For A Stock Auto?

vld · Oct 22, 2005

any concencus on what is the optimum rpm for launching a stock auto? this is assuming a launch from a brake stand or break torque i think some of you call it. i have tried up to 1800 which was ideal for my old 5.0 and she (my 03gt) lopes casually off the line. i am thinking that since this 4.6 likes the higher rpms that i may not even be making power yet at 1800. how high can i go and not break the tranny? i have it in my head to try a launch at 4000 but havent done it yet because auto trannys aint cheap and i do NOT want to break this one.

triggz · Oct 22, 2005

Do NOT neutral drop the trans, thats a QUICK way to destroy the tranny.

Best way to launch these things is to stomp it from an idle, that will 'flash' the torque converter to the max stall speed.. then its just a matter of traction.

If you want a stronger launch, get gears/high rpm stall converter and some sticky tires.

streetstang03 · Oct 22, 2005

neutral drop = death to tranny. just powerbrake until you can get a 3000+ rpm converter

03ghoststang · Oct 22, 2005

im with both guys up top. Neutral drop= No tranny= ...... just save money and get some gears and a high stall convertor that ranges from 2800-3200 rpm oh yeah and a tranny cooler its a must or you'll have tranny problems later

Joel's98GT · Oct 22, 2005

triggz said:
Do NOT neutral drop the trans, thats a QUICK way to destroy the tranny.

Best way to launch these things is to stomp it from an idle, that will 'flash' the torque converter to the max stall speed.. then its just a matter of traction.

If you want a stronger launch, get gears/high rpm stall converter and some sticky tires.

this man speaks the truth.

Hell, i'm lying, autos LOVE nuetral drops, the higher the better, just stomp the gas and let it bang the rev limiter, slam the shifter in D and feel the POWER!!!!! let us know how it turns out

03ghoststang · Oct 22, 2005

Joel's98GT said:
this man speaks the truth.

Hell, i'm lying, autos LOVE nuetral drops, the higher the better, just stomp the gas and let it bang the rev limiter, slam the shifter in D and feel the POWER!!!!! let us know how it turns out

that's funny let me get in my car and see what happens...............oh and to the oiginal poster you'll also need a handheld tuner either DiabloSport or SCT you wont regret this purchase

vld · Oct 22, 2005

neutral drops aside, i am talking brakes locked/rear end spinning to x number rpm then let go brakes. was taught that this is the best way to launch an auto when i was in the 5.0. not the case here?

ponysarepretty · Oct 22, 2005

Launching it by mashing the brakes causes the motor to bog at least for me with the stock converter, i think the most effectiveway to launch is just to mash it from a complete stop.

vld · Oct 22, 2005

k. so the stall converter is overzealous. sucks but good to know. time to shop and save for 4.10s.

Dark Knight GT · Oct 22, 2005

Yup, its best to launch on idle with the stock converter. As for 4.10's, be sure to shop around first before buying. I got my gears about 2 years ago for around 130 dollars from Randy Stinchcomb. He's a great guy to deal with for parts.

Cantslowdown · Oct 22, 2005

I thought it was best to load up the tranny then when its time to go slam the gas down..

DBMSTNG · Oct 22, 2005

i've gotten the best times by holding the rpm at around 1000-1200rpm.

ponysarepretty · Oct 22, 2005

Cantslowdown said:
I thought it was best to load up the tranny then when its time to go slam the gas down..

not if it results in the engine bogging or if it just breaks tractions

carvermach · Oct 22, 2005

The best way I've been able to launch with the stock converter is to brake stall it

vld · Oct 22, 2005

brake stall = brake stand? ie apply brake and open throttle then release brake?

ponysarepretty · Oct 22, 2005

vld said:
brake stall = brake stand? ie apply brake and open throttle then release brake?

yes and for anyone who has tried it on our cars, it seems not to help at all, it seems the driveline bucks and it just boggs.

ponysarepretty · Oct 22, 2005

DBMSTNG said:
i've gotten the best times by holding the rpm at around 1000-1200rpm.

I've only treid it at 1800 (over whcih the brakes get overwhelmed) and at idle, which idle comes out tops at. maybe i shoudl try it at 1000 rpm.......

btw.. all my comments are based on the good old fashioned way of measuring acceleration:

the good old ass.

40th GT · Oct 22, 2005

vld said:
brake stall = brake stand? ie apply brake and open throttle then release brake?

Yeah, and as you release brake, mash the gas.

EDIT: ponysarepretty beat me to it. BTW, I have a 5-spd so I can't really help you here.

propellerhead · Oct 23, 2005

I got my best times with flash stalling (stomping it from an idle).

vld · Oct 25, 2005

tried it. all of it. i seem to get the best launch from @1000rpm brake stand. ran it up to 3k, wouldnt go any higher, backend went sideways then caught and went. fun. dude here told me that my best launch is going to come from a little higher in the power band then from idle because of the gutted cats. had fun figureing it out.

Best Launch RPM For A Stock Auto?

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