Ponyhntr

iTrader: (9)

Is there a way to wire up a boost-a-pump (KB, etc) using the Ractronix harness, and only have the boost-a-pump come on under boost using a Hobbs switch?

I have twin 255's in the tank and the Racetronix harness right now. I'm adding the boost a pump but I don't want the pumps running at 18v or whatever all the time. I just want it to work under boost. If I just unplug the Racetronix harness connectors at the back of the car the fuel pump does not run. That tells me that if I were to wire up the boost a pump like they want you to I won't be able to run the boost a pump only under boost, it would have to be on all the time.

Am I over thinking this?

To sum it up, I want to run the pump at normal voltage with the racetronix harness most of the time, but when I go under boost I want the boost a pump to come on and supply the pumps with 18v. I've had the racetronix harness on the car for several years now, just want to add a boost-referenced boost a pump to the mix.

Thanks for any and all help!

Racetronix

iTrader: (2)

• The Racetronix single harness is not designed to properly power and protect two in-tank pumps.
• The PBIC interface is specifically designed to interface a BAP. You can review the specifics of this connector in our web ad here: http://www.racetronix.biz/itemdesc.a...WH-001&eq=&Tp=
• Even if you have the high-current version of the KB BAP it is questionable as to whether it will support two pumps reliably.
• A properly configured dual in-tank system built by Lonnie can support over 1000HP. Why do you need to add a BAP?

Ponyhntr

iTrader: (9)

The car currently makes 660 rwhp on 91 octane. I'd like to switch to E85.

Racetronix

iTrader: (2)

Walbro HP pumps are not certified for use with E85.
All in-tank wiring must be Teflon.
All the lines in your car must be converted to Teflon and / or Nylon.
You can not have ANY rubber left in your fuel system.

FASTFATBOY

iTrader: (23)

Those twin pumps should be enough on E85, I have seen one 255 on gas safely produce 700+rwhp

Racetronix

iTrader: (2)

700RWHP safely is highly questionable...

Ponyhntr

iTrader: (9)

I'm well aware of what's needed to run E85.

Anybody have an answer to my original question?

Racetronix

iTrader: (2)

Your question was answered in post # 2.

FASTFATBOY

iTrader: (23)

Actually it was 760 to the wheels, it was fat 11 to 1 a/f, 200 dry shot.

Racetronix

iTrader: (2)

This is impressive but still well beyond the recommended HP level for our single in-tank system. Although some people take pride in how far they can push things and get away with it Racetronix can not condone this practice. There must be a good safety margin between what the motor needs and what the fuel system can supply under worst-case scenarios. People reading this post must understand that not every build can reach this HP number. At 58PSI we recommend apx. 600 FWHP FI and 650 FWHP NA as the maximum safe limits. These numbers will change depending on the motor's BSFC, desired WOT A/F, parasitic loads, operating temps, vehicle voltage etc.

Ponyhntr

iTrader: (9)

No not exactly.

That was my question. Forget that I said I have 2 pumps in the tank. Say I only have only one (like in my wife's 02 WS6). I'd like to use a boost (Hobbs) switch to activate the BAP. I know how to wire in the hobbs switch, and I know about the connectors in your harness. But if I wire it like they way it's said to do it, the BAP has to be active all the time for the pump to run, right? If the BAP is not on, the pump will not run--just like if you were to just disconnect the connectors in the harness. Am I right or wrong?

I'd like the pump to run like normal under normal conditions, then when the engine goes into boost I'd like the BAP to come on and supply the pump with 16-18 volts (whatever the case may be). IS THIS POSSIBLE?

FASTFATBOY

iTrader: (23)

You may look at a Kenne Bell Boost a pump, he has something like this I think. VOltage is adjustable.

Wicked94Z

iTrader: (26)

i think you'll burn through walbros quickly at that voltage with e85. look at the edelbrock victor efi inline pump, you'll have to sump the tank though

Ponyhntr

iTrader: (9)

Yeah you're right. If I end up going the E85 route I'll stop screwing around and scrap everything I have now and just put a Aeromotive or Magnafuel system on it and be done.

Wicked94Z

iTrader: (26)

ive looked at basically every every fuel pump option out there, and the edelbrocks are the cheapest alcohol compatible pump that you wont have to run a controller on to avoid overheating the fuel during street driving. all the other alcohol compatible pumps (weldon, magnafuel, etc) are meant for the "big boys" making 1500+.