double pumper
- Thread starter gn1160
- Start date
EYE-OPENER
Member
- Joined
- Dec 24, 2011
Isn't only one supposed to work until boost then the second one kicks in?
One pump for street cruising is more than enough! Bring the second pump it at 12-15 lbs of boost. Two pumps running at cruise is a complete waste, and makes absolutely no sense.
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I like the KISS idea.....keep it simple stupid
While the idea of having a Hobbs switch to cut the other fuel pump on at X lbs of boost is great the fact is something as simple as a failed switch, relay etc etc. can cause that second pump to never come on. And I bet 80% of the people here wouldn't notice it until it was too late.
The downsides of two pumps running all the time are far less IMHO.
While the idea of having a Hobbs switch to cut the other fuel pump on at X lbs of boost is great the fact is something as simple as a failed switch, relay etc etc. can cause that second pump to never come on. And I bet 80% of the people here wouldn't notice it until it was too late.
The downsides of two pumps running all the time are far less IMHO.
Jerryl
Tall Unvaccinated Chinese Guy
- Joined
- Dec 14, 2004
Ahhh . . The single vs DP discussion.
Both work and either makes sense. A failed hobs switch could take out a motor . . . As could a weak pump, a bad tune, or a stuck injector.
There are simply way to many variables and "what ifs" for each strategy to make an argument on "better".
I am biased to the DP because it makes a lot more sense to me. Racetronix via Fullthrottle would be the way to go. Of course, you can always build one, or get one from a non vendor. Lol
Wait a minute. . . .
What was the question? ???
Both work and either makes sense. A failed hobs switch could take out a motor . . . As could a weak pump, a bad tune, or a stuck injector.
There are simply way to many variables and "what ifs" for each strategy to make an argument on "better".
I am biased to the DP because it makes a lot more sense to me. Racetronix via Fullthrottle would be the way to go. Of course, you can always build one, or get one from a non vendor. Lol
Wait a minute. . . .
What was the question? ???
ttypewhite
Well-Known Member
- Joined
- Oct 1, 2001
Two pumps running on the street is overkill. not needed. I have seen these tests being done @ Racetronix when we were testing mine. You would be surprised at how fast the fuel in the tank gets hot with both pumps going, now imagine driving the car for a good long cruise....... I don't understand the concept of running that much fuel while just cruising. The myth about hobb switches seemed to have originated back in the day with Reds double pumper and couldn't be anymore untrue then as it is today. They are very reliable. Too many people taint information based on their perception, not of their experience, then others read it, and run with it as though it's the gospel. I have A LOT to lose with my build, and the hobb switch turning on my 2nd pump is the least of my worries. Been using hobb switches from back in the early 90's and never had one fail on me yet. Just my 2 cents.
ABSOLUTELY AGREE! I' still running my original double pumper setup and hobbs switch that's been in there and trouble free from the mid 90's!
Mike Licht
I was here first
- Joined
- May 23, 2001
running both pumps all the time is a very bad idea, fuel will get very hot, pumps will fail because of the heat, the fuel is what cools them. The hobbs switches are proven ans work well
Mike
Mike
