I know that most or all Super Pro cars leave of the transbrake.. However, I was wondering if anybody uses electronics to control a non-transbrake launch.. For example - using the electronics to control the linelock instead of the transbrake. The reason why I'm asking is because Independent Rear Suspension cars usually don't like transbrake launches as much as launching with the converter pre-loaded... So, here's the setup that I was thinking of:
Use the delay box to hold the linelock and 2-step rev limiter instead of the transbrake and 2-step rev limiter.. If the launch RPM is low enough (i.e. 3000 RPM), the car shouldn't start moving if the front brakes are locked up by the linelock. That way, the suspension and converter are pre-loaded and shock to the suspension and tires is reduced at launch and the chance of spinning is lower..
Does anybody do this or know of anybody that does?
I know that most or all Super Pro cars leave of the transbrake.. However, I was wondering if anybody uses electronics to control a non-transbrake launch.. For example - using the electronics to control the linelock instead of the transbrake. The reason why I'm asking is because Independent Rear Suspension cars usually don't like transbrake launches as much as launching with the converter pre-loaded... So, here's the setup that I was thinking of:
Use the delay box to hold the linelock and 2-step rev limiter instead of the transbrake and 2-step rev limiter.. If the launch RPM is low enough (i.e. 3000 RPM), the car shouldn't start moving if the front brakes are locked up by the linelock. That way, the suspension and converter are pre-loaded and shock to the suspension and tires is reduced at launch and the chance of spinning is lower..
Does anybody do this or know of anybody that does?
why not? I'm planning on going Super Pro with the '68 and run Sportsmen with the '92...so I'll need to use the box.. I already have the box even though it's not installed in the car yet..
why not? I'm planning on going super pro with the '68 and run Sportsmen with the '92...so I'll need to use the box.. I already have the box even though it's not installed in the car yet..
I began posting before you added I'm planning on going super pro, so my initial post was regarding running Sportsman:
still, if memory serves me, NHRA doesn't-allow line-lock activated launches in any of their classes (or they didn't as-of the mid-'90s..... )
in the past, 'some' people have tried it, and gotten-away with it, due to lazy or stupid (or BOTH ) Tech Inspectors.....
I'd check with Tracy or CFI-EFI -
they'd be the guys to ask.
I know NHRA stock eliminator now allows 2-step use with an automatic but I don't think you can use a linelock along with it. I'm planning to install a 2-step on mine but haven't decided on which way to wire it yet. They're also not allowed in our footbrake bracket races so the only time I can test it would be time trials or in a gamblers race.
I began posting before you added I'm planning on going super pro, so my initial post was regarding running Sportsman:
still, if memory serves me, NHRA doesn't-allow line-lock activated launches in any of their classes (or they didn't as-of the mid-'90s..... )
in the past, 'some' people have tried it, and gotten-away with it, due to lazy or stupid (or BOTH ) Tech Inspectors.....
I'd check with Tracy or CFI-EFI -
they'd be the guys to ask.
Well, it can be done without the Tech inspector knowing.. You can just swap the wires after the tech inspection..
I dont think it is illegal. I know some racers that have their delay box hooked up to their line lock to keep the car from moving when the trans brake engages. Why not try leaving at a low rpm on the trans brake
I dont think it is illegal. I know some racers that have their delay box hooked up to their line lock to keep the car from moving when the trans brake engages. Why not try leaving at a low rpm on the trans brake
I still wonder WHY it's not allowed to leave off the linelock...
The problem with launching at just about any RPM on the transbrake is the shock.. The IRS and especially the Hoosier Radial Slicks don't like transbrake launches as they don't like to be shocked at all.. They are useless for stick cars and lauches without preloading the tires/suspension... Switching back to bias-ply might help a little bit but the IRS generally doesn't like to be shocked..
I still wonder WHY it's not allowed to leave off the linelock.....
It is. If the delay box is legal for the class or category, it doesn't matter whether it activates a trans brake and/or a line lock. See page 227 and 228, paragraph 8:2, of section 16-General Regulations of the 2007 NHRA Rulebook.
It is. If the delay box is legal for the class or category, it doesn't matter whether it activates a trans brake and/or a line lock. See page 227 and 228, paragraph 8:2, of section 16-General Regulations of the 2007 NHRA Rulebook.
RACE ON!!!
Thanks for the clarification on that!
I asked that question at a Division One Track Operators annual meeting (early-'90s? ) and they stated that line-lock activated launches were illegal in ANY class:
I didn't know the rule had been changed.
I sent this question to Division Two, but you answered the question before they replied:
they might be at Maple Grove for the Keystones this weekend.....
It is. If the delay box is legal for the class or category, it doesn't matter whether it activates a trans brake and/or a line lock. See page 227 and 228, paragraph 8:2, of section 16-General Regulations of the 2007 NHRA Rulebook.
RACE ON!!!
So, why are others saying that it's not legal? I'm not planning on using it in the Sportsmen class.. I want to race SUPER PRO..
I have sent numerous e-mails to Division Two in the past weeks, but they've not replied
(makes you wanna run right-out and join the NHRA, huh? ):
I have since received many e-mails from racers across the country saying that launching off the line-lock IS legal in bracket-racing competition, so my initial answer was wrong.
I asked the same question many years ago at the annual Track Operators Meeting (through a friend who sat-in on the meetings ) when I raced in Division One, and the Track Operators at that time had decided against allowing line-lock launches, so the ruling has been changed:
good-luck with your project.
I have sent numerous e-mails to Division Two in the past weeks, but they've not replied
(makes you wanna run right-out and join the NHRA, huh? ):
I have since received many e-mails from racers across the country saying that launching off the line-lock IS legal in bracket-racing competition, so my initial answer was wrong.
I asked the same question many years ago at the annual Track Operators Meeting (through a friend who sat-in on the meetings ) when I raced in Division One, and the Track Operators at that time had decided against allowing line-lock launches, so the ruling has been changed:
good-luck with your project.
Thanks!! Anyways, I will try both, launching off the transbrake and linelock and will see what will give me more consistent ET's and R/T's
Thanks!! Anyways, I will try both, launching off the transbrake and linelock and will see what will give me more consistent ET's and R/T's
..... because it was deemed illegal at the time, I never followed-through in attempting that idea, but I was told by Goodyear engineers & technicians (and Dave Morgan, and Scott Weney, and Reher-Morrison, etc. ) that although a line-lock launch is easier on your equipment, it won't 'shock' the tire & chassis hard-enough to work properly like a trans-brake would:
maybe some of the guys who run trans-brakes can verify this for you.
..... because it was deemed illegal at the time, I never followed-through in attempting that idea, but I was told by Goodyear engineers & technicians (and Dave Morgan, and Scott Weney, and Reher-Morrison, etc. ) that although a line-lock launch is easier on your equipment, it won't 'shock' the tire & chassis hard-enough to work properly like a trans-brake would:
maybe some of the guys who run trans-brakes can verify this for you.
Transbrakes work very well with solid axle vehicles but transbrakes and IRS often don't mix very well. It's doable but a IRS car will never launch as hard and consistent than a solid axle car off the transbrake..
Corvette Store
Launching with electronics off the footbrake??
Could really use sponsors on my race car. Please contact me if interested.
