How You Launch

[wild85]

I am changing trannies, going with th350 from 700r4, lockup to non lock up. My brakes cannot hold the tires still when trying to launch, and the racers at my local speed shop say they all flash the converter. How do you guys launch and how do you flash the converter at the line?

[xeniadrums]

i don\'t have any problems with flashing the converter. My brakes seem to hold fine and they\'re completely stock.



Check to make sure your brakes are working properly.



maybe it\'s idling too high or maybe you need a different converter.



just an idea!

[FastBikesRule]

What\'s \"flashing the converter?\"

[ZZ4Blazer]

foot on brake, foot on gas

[rudedogg]

flashing the converter is sitting at idle and stomping on the throttle,stall speed is much different than flash speed,you can usually get more stall from a converter this way... http://www.s10v8.com/images/smilies/icon_eek.gif

[Knanthrup]

Dunno about you guys, but I launch with one foot on the gas, and the other dropping the clutch http://www.s10v8.com/images/smilies/icon_biggrin.gif

[ZZ4Blazer]

On 2003-11-08 03:51, Knanthrup wrote:

Dunno about you guys, but I launch with one foot on the gas, and the other dropping the clutch http://www.s10v8.com/images/smilies/icon_biggrin.gif





http://www.s10v8.com/images/smilies/icon_biggrin.gif

[gdmclnh]

Stall speed is the speed at which the converter will allow the engine to rev to without spinning the wheels (if using a line lock to set front brakes or to a certain extent the foot brake) or max rpm if trans brake is used. Flashing a converter is keeping the RPMs below the stall speed and then releasing the brake or trans brake with throttle applied. The increased instantaneous application of torque will cause the RPMs to exceed the stall speed giving a higher effective gear ratio. This can help a good traction setup plant the tires and launch the car forward better than just launching at the stall speed. It can also make a poor traction setup worse. So beware, flashing a converter in some cases is good (if your truck\'s tire/suspension setup can handle the harder hit) and bad if you can\'t make good use of the additional RPMs at the launch. I have seen many a good running truck/car run slower 1/4 mile times than they normally run by flashing the converter at the line than if they just brought the engine up to the stall speed and left because they caused more tire spin by flashing the converter. I have also experienced this through experimenting with my own setups on cars/trucks than my S10.



<font size=1>[ This message was edited by: gdmclnh on 2003-11-09 07:22 ]</font>

[bigfoot]

On 2003-11-09 08:16, gdmclnh wrote:

Stall speed is the speed at which the converter will allow the engine to rev to without spinning the wheels (if using a line lock to set front brakes or to a certain extent the foot brake) or max rpm if trans brake is used. Flashing a converter is keeping the RPMs below the stall speed and then releasing the brake or trans brake with throttle applied. The increased instantaneous application of torque will cause the RPMs to exceed the stall speed giving a higher effective gear ratio. This can help a good traction setup plant the tires and launch the car forward better than just launching at the stall speed. It can also make a poor traction setup worse. So beware, flashing a converter in some cases is good (if your truck\'s tire/suspension setup can handle the harder hit) and bad if you can\'t make good use of the additional RPMs at the launch. I have seen many a good running truck/car run slower 1/4 mile times than they normally run by flashing the converter at the line than if they just brought the engine up to the stall speed and left because they caused more tire spin by flashing the converter. I have also experienced this through experimenting with my own setups on cars/trucks than my S10.





thanks this was very informitive

[gdmclnh]

Also keep in mind that advertised stall speed for a specific converter will not be the same for all engines. A converter that stalls at 2800 RPM for a 350 FT LB engine may stall at 3200 RPM for a 450 FT LB engine.

[83jimmy]

i read in chp, that a converters advertised stall speed is based on an engine making 250 ft lbs of torque.ive had mine go as high as 4200 rpms,but guaranteed 3 grand,which my truck cant handle...so i launch full throttle at 2700.



jegs 3500+stall...220 at my door.been daily driving and racing for 2 years now.i like it.

[Diablo]

I can be driving, and giving it gas.. and then give it some more and it just revs, and press harder and then it finnaly starts going.. whuts that mean?