Separate back up button?

Bill Baer · 01-09-2017, 01:21 AM

Does anyone use a separate back up button to put their PG solenoid in to engage reverse without engaging the delay box/throttle stop or starting line control cylinder?
I'm thinking I could wire one in the circuit with a diode preventing feedback to the delay box but I don't have any knowledge concerning diode sizing or ratings etc.
Can one of you Guys help me out with this?

voltdr · 01-09-2017, 12:09 PM

You don't need a diode. The 12V when put to the transbrake is on the output terminal of the delay box and does not cause any issues in the delay box.
Dan

63corvette · 01-09-2017, 05:03 PM

The Don Davis race car wiring diagram is setup that way for wiring the Davis cars.
I wired my own and did not use the separate button/switch because I thought it might accidently get tripped while moving to the staging lanes in low gear causing a real issue.
The wiring diagram showed a simple on/off switch and I have looked at a few Davis cars which had the switch mounted on the dash panel.
I just chose not to use one.
Just My 2 Cents
Rick Cates
Canyon, TX

voltdr · 01-09-2017, 05:26 PM

I've used them in the past. I just used a toggle switch mounted on the dash, that way there wasn't a chance of accidentally hitting it while driving around, and I didn't have to hold the button down while turning the wheel.
Dan

Lenny5160 · 01-09-2017, 05:58 PM

One side of button to +12 volts, the other side of the button to the Transbrake terminal of the delay box. That's it; no problems.

Jeff Stout · 01-09-2017, 06:32 PM

Could you use a momentary switch. You would have to steer with 1 hand and hold switch to go in reverse. That way you will never forget to flip toggle switch.

SGSST109E · 01-09-2017, 09:58 PM

I use a toggle switch on the steering, just parallel the transbrake button. I use a red aircraft cover which protects the switch from being accidently hit.

Lenny5160 · 01-10-2017, 02:00 PM

Quote:

Originally Posted by Jeff Stout

Could you use a momentary switch. You would have to steer with 1 hand and hold switch to go in reverse. That way you will never forget to flip toggle switch.

In my dragster, I use a small microswitch on the top framerail in the cockpit. I can only have one hand on the steering wheel, but turning the wheel doesn't affect my ability to hold onto the button.

voltdr · 01-10-2017, 04:40 PM

If you use a toggle switch, you won't forget that it's on. As soon as you put the trans in low gear, to move forward, the brake will be applied. Then you know you have to turn off the switch.
Dan

Shake & Bake · 01-10-2017, 09:16 PM

My trans brake button I use to back-up is mounted on a bar overhead right next to my dome light.....It isn't hot all the time...I flip a switch to put power to it, back up and then turn the switch back off..

01-09-2017, 01:21 AM	#1
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Separate back up button? Does anyone use a separate back up button to put their PG solenoid in to engage reverse without engaging the delay box/throttle stop or starting line control cylinder? I'm thinking I could wire one in the circuit with a diode preventing feedback to the delay box but I don't have any knowledge concerning diode sizing or ratings etc. Can one of you Guys help me out with this? __________________ Bill Baer 3391 SC, 339B SC, QR

01-09-2017, 12:09 PM	#2
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 705 Likes: 77 Liked 97 Times in 50 Posts	Re: Separate back up button? You don't need a diode. The 12V when put to the transbrake is on the output terminal of the delay box and does not cause any issues in the delay box. Dan

01-09-2017, 05:03 PM	#3
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 551 Likes: 127 Liked 353 Times in 102 Posts	Re: Separate back up button? The Don Davis race car wiring diagram is setup that way for wiring the Davis cars. I wired my own and did not use the separate button/switch because I thought it might accidently get tripped while moving to the staging lanes in low gear causing a real issue. The wiring diagram showed a simple on/off switch and I have looked at a few Davis cars which had the switch mounted on the dash panel. I just chose not to use one. Just My 2 Cents Rick Cates Canyon, TX

01-09-2017, 05:26 PM	#4
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 705 Likes: 77 Liked 97 Times in 50 Posts	Re: Separate back up button? I've used them in the past. I just used a toggle switch mounted on the dash, that way there wasn't a chance of accidentally hitting it while driving around, and I didn't have to hold the button down while turning the wheel. Dan

01-09-2017, 05:58 PM	#5
Lenny5160 Senior Member Join Date: Nov 2015 Location: Inver Grove Heights, MN Posts: 898 Likes: 604 Liked 431 Times in 224 Posts	Re: Separate back up button? One side of button to +12 volts, the other side of the button to the Transbrake terminal of the delay box. That's it; no problems. __________________ S/ST 51 S/C 53

01-09-2017, 06:32 PM	#6
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,484 Likes: 65 Liked 704 Times in 281 Posts	Re: Separate back up button? Could you use a momentary switch. You would have to steer with 1 hand and hold switch to go in reverse. That way you will never forget to flip toggle switch.

01-09-2017, 09:58 PM	#7
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Separate back up button? I use a toggle switch on the steering, just parallel the transbrake button. I use a red aircraft cover which protects the switch from being accidently hit.

01-10-2017, 04:40 PM	#9
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 705 Likes: 77 Liked 97 Times in 50 Posts	Re: Separate back up button? If you use a toggle switch, you won't forget that it's on. As soon as you put the trans in low gear, to move forward, the brake will be applied. Then you know you have to turn off the switch. Dan

01-10-2017, 09:16 PM	#10
Shake & Bake Member Join Date: Mar 2010 Posts: 311 Likes: 39 Liked 36 Times in 32 Posts	Re: Separate back up button? My trans brake button I use to back-up is mounted on a bar overhead right next to my dome light.....It isn't hot all the time...I flip a switch to put power to it, back up and then turn the switch back off..