start line control

Would like some thought on what people feel is better/faster for a start line control besides a clutch pneumatic or electric? some reasons or experience behind comments would be appreciated. we are running a blown 526 with a powerglide.

Thanks
Simon

 

8973

Not sure I understand the question but if your asking about launch control. We run a blown 500ci Hemi with a Mag 44 and a glide. We use a MSD 8973 for launch control. It helps with tricky track conditions as well.

 

I mean start line control, like a 2 step or a throttle stop style system activated on a trans brake button for consistent rpm at launch, does a 2 step react faster than a pneumatic style when you let the button go?

 

From what I've seen it depends on your combination. We ran an air throttle in conjunction with a two-step on a roots set-up with no problems for quite some time. We liked this set-up because it seem easier on pretty much everything. After we switched to a screw and tried to run the same set-up we fought dead cylinders at the hit. We started launching WFO on the two step and the dead cylinder problem has improved.

Joad Donnelly

 

I guess i am not explaining this right, i have had a 2 step or low side rev limiter(ETC) and then switched to an air operated launch control (limiting rpm at WOT) both seemed to be ok although it does make me a little nervous on the 2 step at WOT, but it seems to me my reaction times were better on the 2 step as opposed to the air operated throttle stop. with both set to control rpm at 5500 and my foot buried at WOT, So my question was do either affect reaction time differently or am i just getting slower?

 

brake

the transbrake controls the RT not the rpm control. The glide is the fastest brake out there. 5500 is a lot of steam. Most blown stuff with a conv is 4000 or so. We've run every kind of automatic and launch configuration and the only one that really screwed with reaction time was a TH400 about 15 yrs ago.
The airthrottle will have consistency problems over WOT on the 2 step but it's a lot easier on parts.

 

starting line

I have been working with a friend that added the air controller to the 2 step this year. last year we shook the tires 5 times leaving on the 2 step. This year we have shaken 20-30 times. The air controller only allows the roots to build 17 lbs of boost not the 25 lbs as the 2 step. Also I have noticed that the fuel curve with the air controller is completely different at the launch then the 2 step. Has anyone every had this issue using both???

 

So no time difference between button and 2 step to wot or button to solenoid to cyl to wot? I must be me getting slower i guess.

 

im guessing you're tuneup is on the edge of shake all the time. Pull more timing when you release the button and it will probably be happier. We've gone back and forth between air throttle and wide open with no real performance change. Almost doubled the boost on a screw and the car 60ft the same with the same tuneup.