Reaction time

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Reaction time

Post  snuff98 on June 19th 2017, 3:30 pm

What could possibly going wrong in a tube chassis car besides the driver that would make the reaction times become slower and slower but the 60 foot and et stay the same. went from 1.085 now .975 and still cutting .115 lights. tried two different delay boxes with the same results.

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Re: Reaction time

Post  Hardy on June 20th 2017, 12:02 am

How many passes do the slicks have on them? I'm not sure it would ever make that big of a difference, but I've noticed over the years that the sidewalls wear out long before the tire is out of tread. The first sign has always been reaction times getting inconsistent

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Re: Reaction time

Post  snuff98 on June 20th 2017, 7:59 am

slicks have about 20 passes and about 2 months old

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Re: Reaction time

Post  pmrphil on June 20th 2017, 8:35 am

Transbrake solenoid hanging up? Sticking? Transbrake button?

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Re: Reaction time

Post  Hardy on June 20th 2017, 10:17 am

snuff98 wrote:slicks have about 20 passes and about 2 months old

That's not it then. Transbrake/button/solenoid is a good suggestion. I'd look into that

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Re: Reaction time

Post  snuff98 on June 20th 2017, 10:38 am

I forgot all about a relay between the delay box and the transbrake solenoid. This could be the culprit, its just a 30 amp fog light relay I put in years ago to take some load off the delay box. I will delete it and try it out.

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Re: Reaction time

Post  Hardy on June 20th 2017, 1:47 pm

I hope that solves it! Good luck

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Re: Reaction time

Post  dr's wife racing on June 20th 2017, 7:19 pm

You havn't changed front tires by chance? Any thing that increases the travel in the front will increase your reaction time. Shocks worn allowing more movement.
Transmission pump pressure being low will change the way a converter hits. Low line pressure will cause it not to hit as hard to move the car.
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Re: Reaction time

Post  BigDave65 on June 22nd 2017, 10:31 am

snuff98 wrote:I forgot all about a relay between the delay box and the transbrake solenoid.  This could be the culprit, its just a 30 amp fog light relay I put in years ago to take some load off the delay box.  I will delete it and try it out.

I would definitely remove that relay. All you need between the delay box and the TB solenoid is a wire!
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Re: Reaction time

Post  maverick on June 24th 2017, 2:51 pm

True. The tb solenoid probably only pulls an amp or two. Relays are for high amp loads.
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Re: Reaction time

Post  pmrphil on June 24th 2017, 7:35 pm

What Maverick said - two coils in a solenoid, pull-in (which has a momentary fairly high draw) and the hold-in coil, which (like he said) only pulls an amp or so.

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Re: Reaction time

Post  snuff98 on June 26th 2017, 8:37 am

I found the problem. Transbrake solenoid sticking very bad. Wires at the solenoid were melted and plunger very hard to move.

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Re: Reaction time

Post  pmrphil on June 26th 2017, 10:36 am

Wait until you turn it loose now - RED lights for a while. Glad you found it.

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Re: Reaction time

Post  maverick on June 26th 2017, 4:14 pm

Go back to your old delay number Wink
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