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Old 10-03-2012, 09:21 AM   #1
kennyb68
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Default Slowing cars reaction time

I'm having a problem slowing my car reaction time so I can leave on the flash of the last yellow bulb.
Currently I have to leave somewhere between the yellow and the green.


I have a 93 mustang with a 550 horse SBF and a powerglide with a pro brake, 180 gear, 4.30 rear gear and 28" tall rear tires, 26" tall moroso front tires.
Rear suspension is all Team Z. Car weight with me is 2700lbs.

I have the front suspension totally loose.
Launch at 4000 RPM. = 1.43 60' time.
Long Biondo trans brake button.
Front tire pressure 35psi.
Rear tire pressure 10psi.

What else can I do to slow it down?
Will staggering my front wheels help?

Thanks
Ken
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Old 10-03-2012, 09:32 AM   #2
cumminatya
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Default Re: Slowing cars reaction time

There are countless ways! longer transbrake button for one tire pressure ? this list goes on it all depends on what works for the driver
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Old 10-03-2012, 09:34 AM   #3
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Default Re: Slowing cars reaction time

Taller front tire would help for sure, launch 500 rpms less.
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Old 10-03-2012, 09:38 AM   #4
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Default Re: Slowing cars reaction time

Where are you staging at, deep or shallow? If I stage too deep, I'll bulb. If I just tickle the second beam, it's ok.
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Old 10-03-2012, 09:47 AM   #5
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Default Re: Slowing cars reaction time

I shallow stage, I just tickle the second beam.
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Old 10-03-2012, 10:15 AM   #6
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Default Re: Slowing cars reaction time

X2, with what you have, knock at least 5psi out of the front tires, and reduce launch rpm.

Taller front tire, knock the rear gear down to 4.11.
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Old 10-03-2012, 10:31 AM   #7
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Default Re: Slowing cars reaction time

How much red are you going? Is by a consistant amount? Is the track and beams consistant(even from lane to lane)?

Like cumminatya said there are countless ways of impacting R/Ts. Taller front tire, tire pressure, staggering wheels, anti-squat, launch RPM and driver are all changing the R/T.

We are fighting red lights in Scotty Bs car now on a 500 pro tree with a stick car. We changed front tires added ballast in rear to firm up some inconsistancy we saw on film and tested, made 4 passes. RT's were .003, .008, .020, .001 . Went to another track and R/Ts were all over the place (spread of .120 overall from .030 red to .087 green) and others noticed lane to lane was off also with one being tight. Red in right was green in left. Letting some air out in front helped but still was inconsistent. Maybe it's car, track or the driver having a bad day. We will see in BG this weekend.
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Old 10-03-2012, 10:41 AM   #8
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Default Re: Slowing cars reaction time

Bigger front tire
Less pressure in rear tires (if it can still hook)
Lower launch rpm
Throw a sandbag or two in the trunk (seemed to work for me)
Add more travel up front
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Old 10-03-2012, 11:06 AM   #9
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Default Re: Slowing cars reaction time

Also what type of racing is it? Heads up, bracket, or index? I assume since you said last amber it's full tree and so assuming once again bracket? A lot of things you do to car set-up will also affect ET to some extent.
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Old 10-03-2012, 11:45 AM   #10
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Default Re: Slowing cars reaction time

Lower launch RPM. It works like a charm and you can progressively lower/raise based on track rollout/your reactions that day/anything else. Try 3500 and see what happens!
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Old 10-03-2012, 01:07 PM   #11
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Default Re: Slowing cars reaction time

How much front suspension travel? Get as much as you can. Get 28" tall front tires. Hell, I run the MT 29" on my wagon. Very tight fit on turns, but I'm still trying to find about .08 second. How much air in front tires? You could get some with just dropping your current tires.
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Old 10-03-2012, 03:10 PM   #12
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Default Re: Slowing cars reaction time

What's A guy do if he leaves at idle, and flashes the convertor. How does he slow it anymore? Take some air out of the front tires?
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Old 10-03-2012, 04:23 PM   #13
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Default Re: Slowing cars reaction time

Yup. As long as it doesn't give you control issues down track.
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Old 10-03-2012, 04:26 PM   #14
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Default Re: Slowing cars reaction time

Leave later.....
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Old 10-03-2012, 06:19 PM   #15
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Default Re: Slowing cars reaction time

Quote:
Originally Posted by Leavinsteven View Post
Leave later.....

Nice!,lol... I like to leave tho the minute i see it flash on
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