Transbrake question

[JimP]

I hadn't really put my transbrake to the test until last night (other than some 5-6 lbs launches), I have a Pat's 3,400 stall converter. While on the brake I hit 3,400r.p.m's with "0" boost, then boost comes up very fast, still at 3,400 r.p.m.'s as soon as I see over 15lbs my r.p.m.s climb like the car is in neutral, still doesn't move and I easily hit 20+ lbs of boost. I let off once I saw over 4,800 r.pm.s.

I was wondering if I have a converter that stalls at 3,400 r.p.m. how is it possible that I am able to rev past that while on the transbrake. I could hit 20 lbs in less than 3 seconds if I mat it. Any chance I hurt anything? A two step is on it's was just sorting some other issues out until then.

Jim

 

[bison]

The more torque you put in the higher the stall speed. With some of the combos I've built seeing a 5500 stall speed at 27-28psi is common and a good thing if the suspension is working. That stall speed is the flash stall speed. Having a tight strong performing combo requires a certain flash stall. The quicker the engine gets to the power band and the longer it stays there the more potential the car has to be quick. I can hit 28psi in about 2 sec. On my black car

 

[JimP]

Ok Thanks Bison, this explanation makes sense. I'm pretty happy with how it works even with a newly developed header leak at the cross over on the driver's side. I'll be fixing that this weekend. The tack weld on the Kirban's driver's side header came apart at the flange and I can't properly snug it up at the crossover.