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Author
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Topic: What rpm would you launch at with 4600 stall and transbrake?
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70coupe
Gearhead Posts: 483
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 08-22-2002 10:45 AM
  
I will be hooking up the transbrake this weekend and wondered what chip you guys would start at in the 2 step? Currently I have a 3200 chip launching off a 2 step with my 4600 converter. Is it like a standard with the brake, the higher you launch the faster you'll go or is it still good to flash the converter?
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 08-22-2002 11:11 AM
With my car, the higher I 2 step it, the faster it goes. Until traction becomes an issue. My convertor will flash in normal air around 6000 rpm, I 2 step it to 4500 most of the time. Any more than that on a normal track, and it really smacks the tires and makes the car inconsistent. Goes faster, but not near as consistent. With your convertor, I would try around 3800-4000 at first. But take this into consideration, I ran an entire season with a transbrake without a 2 step. Lots of fun, but not real consistent, and kind of hard on drivetrain parts. Like any go fast part, it will take some trial and error to find what your car likes best. Maybe even for the first pass, leave the 2 step where it is now, and see if the car picks up at all just from using the brake.
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70coupe
Gearhead Posts: 483
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 08-22-2002 11:18 AM
Does the transbrake hit harder launching at 4000 compared to the 2 step at 4000 or the same? If its the same why would the brake be harder on drive train parts?
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-22-2002 11:18 AM
On our 408w that stalls at 4500 we've tried everything between 3000-4400 with similar results. Our traction is marginal w/10" slicks and the 408 has more bottom end torque than your 'C'. Some of our best 60'ers have come with the two step at 3300 and 4000 sooo, we're still experimenting.  Good luck, SteveW
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-22-2002 11:24 AM
quote:
Originally posted by 70coupe:
Does the transbrake hit harder launching at 4000 compared to the 2 step at 4000 or the same? If its the same why would the brake be harder on drive train parts?
The t-brake hits the tires harder than footbraking, because the drive line isn't loaded when the t-brake is released and is shocked when the solenoid is released.
Also the engine gets loaded up with fuel on the chip, so it's ready to GO when the two step is released. (GO= like a grenade)  SteveW
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 08-22-2002 11:25 AM
I'm not sure if it will hit harder or not. I'm assuming you are using dual line locks with the step now. I would think it would hit harder, but that's only a guess. Since the 'brake is actually engaging 2 gears at once, and is "locked up", I would think the sudden release of the other gear would be a harder and more sudden impact than line locks. But, this all just a gues since I have never driven a dual line lock launched car before.
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70coupe
Gearhead Posts: 483
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 08-22-2002 11:34 AM
Actually, I have the two step wired to the brake pedal and only use the line lock for the burnout. The brake pedal is the only thing holding the car at the line and it works just fine. At 3200 on a 4600 stall I dont have much pull on the car.[This message has been edited by 70coupe (edited 08-22-2002).]
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