DP wiring

[magnumv8]

personally I would let the ECU control the fuel pump relay as designed and put a momentary switch under the hood to manually enable the fuel pump relay as needed at fuel check....it is simple and easy to do, makes usage a snap......my system is set up this way......


D L Rambo

[Ed Wright]

Originally Posted by magnumv8

personally I would let the ECU control the fuel pump relay as designed and put a momentary switch under the hood to manually enable the fuel pump relay as needed at fuel check....it is simple and easy to do, makes usage a snap......my system is set up this way......


D L Rambo

I use FAST, and that is the way I do it.

[NewHemi]

I certainly agree that doing the fuel that way would work just fine. And if we had time and been thinking more clearly, maybe we would have done that too. But we were in the pits at a race, and were thinking "quick fix"... But the main point I was making, and other also agree, is don't let the ECU handle it 100% of the time. You do need to turn it on when the ECU isnt aware of it.

And Mack Reeves makes good sense on the relay and switch thing too. If you know what yourt doing, you can get along with that, but frankly why would you want to? And besides how many racers really electric wizards..

Isn't this a nice dialogue? See what happens when Drag Pak guys can talk to each other, without being attacvked and getting flamed for having too low of a hp factor?

David
The New hemi Guy

[Mack Reeves]

Makes you want to set up a web site just for this .......

[Mack Reeves]

Originally Posted by magnumv8

personally I would let the ECU control the fuel pump relay as designed and put a momentary switch under the hood to manually enable the fuel pump relay as needed at fuel check....it is simple and easy to do, makes usage a snap......my system is set up this way......


D L Rambo

I like the idea of a momentary switch under the hood... Thanks for the tip... Mack

[magnumv8]

wire the relay like this.....

pin 30 goes to the pump

pin 87 is your power for the pump

pins 85 & 86 are the relay coil for activating the relay, wire as necessary for compatibility with your ECU.(some are positive switching and some are ground switching)....

lastly, wire your momentary switch (fused) with the connection going to pin 87A of the relay.....

this allows everything to function normally while allowing you to supply power to run the pump with the computer "off"...this also won't cause a "back-feed" condition into the computer which could damage it......


D L Rambo......

[Mack Reeves]

Originally Posted by magnumv8

wire the relay like this.....

pin 30 goes to the pump

pin 87 is your power for the pump

pins 85 & 86 are the relay coil for activating the relay, wire as necessary for compatibility with your ECU.(some are positive switching and some are ground switching)....

lastly, wire your momentary switch (fused) with the connection going to pin 87A of the relay.....

this allows everything to function normally while allowing you to supply power to run the pump with the computer "off"...this also won't cause a "back-feed" condition into the computer which could damage it......


D L Rambo......

Thanks for the info..... Will set mine up this way also.... Mack

[Knocky]

Thanks for all the input! I'm sure the info will be useful...
I like FAST that can hold 4 different tunes (switch at track w/o use of laptop). Is FAST Not available with dual wide band sensors though (like the AEM & Mopar)?
Anyone here run the Mopar EMS system & EMS harness? Was wondering if it was equipped with more specific connectors and harness lengths...?
I understand it is an AEM unit...
Thanks again, Mark

[NewHemi]

It is my understanding that you can hook up the second O2 sensor on an aux plug, and then use two. We currently only use one, but will put in the second one once we finalize our collectors this winter.

David
The New Hemi Guy