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Old 02-21-2011, 06:15 PM   #16
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Yeah I did what McFly did and works great. Doesn't spark nearly as bad.

Yeah my poor box has been the community box before. Along with my ingitor, and fuel bottle (by accident)
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Old 02-21-2011, 06:19 PM   #17
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This is what I found:



It is grounded and note the fuse/breaker...
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Old 02-21-2011, 07:04 PM   #18
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I'm not clear how the relay helps... Can you elaborate?

Quote:
Originally Posted by McFly505 View Post
Re-post...

To all those with the same setup, you WILL eventually have the same problem.

Theses starter boxes have little, flimsy contacts that, in stock form, handle ALL of the current the motors pull. Not quite the hot setup, IMO.

I had the same issue, so I made new contacts from copper(1/2" copper tube, smashed flat and cut/dremel'd to fit), but I still wasn't happy with the performance I was getting.

So I took it one step further and added a relay to handle the current.

This setup may be overkill, but it ALWAYS works and it's one less thing to worry about come race day.

And yes, it WILL start a Mack truck....

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Old 02-21-2011, 07:54 PM   #19
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Instead of all current running through the switch and/or contacts, the relay handles it.

Without the relay, the contacts end up getting smoked and your left with a box that won't work when you need it the most.

It is certainly not necessary, but it will definitely make life easier on the box.
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Old 02-21-2011, 08:02 PM   #20
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Quote:
Originally Posted by McFly505 View Post
Instead of all current running through the switch and/or contacts, the relay handles it.

Without the relay, the contacts end up getting smoked and your left with a box that won't work when you need it the most.

It is certainly not necessary, but it will definitely make life easier on the box.
I see. So pushing down the starter box just turns on the switch instead of passing the current to the motors. What part are u using?
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Old 02-21-2011, 08:11 PM   #21
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Quote:
Originally Posted by McFly505 View Post
Instead of all current running through the switch and/or contacts, the relay handles it.

Without the relay, the contacts end up getting smoked and your left with a box that won't work when you need it the most.

It is certainly not necessary, but it will definitely make life easier on the box.
Any wiring diagram? Thanks!
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Old 02-22-2011, 10:27 AM   #22
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I'll get you guys a wiring diagram when I get back home.

I'm out truckin!!!
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Old 02-22-2011, 10:34 AM   #23
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Quote:
Originally Posted by McFly505 View Post
I'll get you guys a wiring diagram when I get back home.

I'm out truckin!!!
Part to!
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Old 02-22-2011, 11:50 AM   #24
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I did the same thing to my OFNA chrome top the first day that I bought, it's still working in 2 years of use.

I have a diagram made in Eplan, but I cannot post images since I'm new to the forum.
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Old 02-22-2011, 11:57 AM   #25
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Quote:
Originally Posted by BiteTheBullet View Post
I did the same thing to my OFNA chrome top the first day that I bought, it's still working in 2 years of use.

I have a diagram made in Eplan, but I cannot post images since I'm new to the forum.
What's the exact part number u used?
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Old 02-22-2011, 12:03 PM   #26
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Quote:
Originally Posted by teeforb View Post
I have a 5s 4200mah 35c I can turn into a 4s. Shall I do that?
I've been runny my Ofna truggy box on 5S for a year now and it works great. So does using a 12v relay - much better than the brass contacts. Solder the leads to the motor, ditch the on/off switch, and use decent wire and battery connectors and you're golden.
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Old 02-22-2011, 12:53 PM   #27
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Quote:
Originally Posted by Gary NJ View Post
I've been runny my Ofna truggy box on 5S for a year now and it works great. So does using a 12v relay - much better than the brass contacts. Solder the leads to the motor, ditch the on/off switch, and use decent wire and battery connectors and you're golden.
What's the part number?
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Old 02-22-2011, 02:44 PM   #28
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There is no part number teeforb, it's a simple car relay, you should find it really easy in a auto shop
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Old 02-22-2011, 03:29 PM   #29
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Quote:
Originally Posted by BiteTheBullet View Post
There is no part number teeforb, it's a simple car relay, you should find it really easy in a auto shop
i would think it's max by amps and voltage. Like a 12v 30AMP relay or a 1v .5Amp relay. I believe a relay is just some bjt, Darlington pairs, or some kink of high amp transistors. Therefore, specs are important.

and there's SPDT (single pole double throw) and SPST (single pole single throw)...
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Old 02-22-2011, 03:31 PM   #30
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Quote:
Originally Posted by Gary NJ View Post
I've been runny my Ofna truggy box on 5S for a year now and it works great. So does using a 12v relay - much better than the brass contacts. Solder the leads to the motor, ditch the on/off switch, and use decent wire and battery connectors and you're golden.
how is it using 5S compared to 4S?
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