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turbo launch

2K views 8 replies 7 participants last post by  93MustangCobra 
#1 ·
Any of you do any footbrake launching with a turbo, or a pair of turbo's consistently? Reason for asking, I thought about doing something with my other car but I run a footbrake class, no transbrake allowed.
 
#2 ·
I foot brake my twin turbo car, but it's not a Ford, a lot heavier car with tall gears. Not as consistent as a trans brake, and I can't build much boost off the line, but the car has tiny turbos so the boost comes on hard right away. 1.59 60' times in a 4700# car with 2.65 gears. It can be done, but if you have big turbo(s) & a light car you are going to get some lag.
 
#3 ·
how many calipers you have on the rear?
we can hold a good bit of RPM and boost on the foot brake with dual strange on the rear.

could also use a dump valve to drop all converter charge pressure off and make it sit with nothing pushing the car.
 
#7 ·
Dump valve is out. It takes some time to get the converter to charge again after dumping. Not a lot, but it does take time. IOW, not instant. Someone asked about calipers. Car has single piston calipers front and rear and they work great. But I don't think they'll hold the car while trying to spool it.

Timing and nitrous might just do it-which was a trick I used on a 2.3T. A 50 shot and retarded timing would make 25 psi with a stick shift, at 4000 RPM. This might work at a lower RPM with an auto. Didn't think of it to be honest.

Car's in the shop, my dad's anxious to get it to the track and I'm sticking a N/A 347 back in it for the time being so he can get his fix. Eventually I'll do something with it. Just planning ahead of time.
 
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