Is there a inline pump that can support big HP
Oct 20, 2008 | 04:27 PM
#1
Thread Starter
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
Is there a inline pump that can support big HP
Yah might sound dumb but I am just looking for a fix to this for NOW.. I plan to step up to a fuel cell, pump soon, but need a fix...
Thanks John
Thanks John
Last edited by Mangled03gmc; Oct 20, 2008 at 07:02 PM.
Oct 20, 2008 | 07:23 PM
#4
Thread Starter
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
I am running a inline walbro 255 now and running out of fuel up top.. This just needs to be a quick fix till I can do the fuel cell... I don't have any hp numbers, but the 255 isnt cutting it...
John
John
Oct 20, 2008 | 11:51 PM
#5
I have had success dropping the fuel rail pressure from a 4-bar baseline to 3-bar. You've obviously got large injectors so chances are they were designed for a 3-bar spray pattern anyway. If you have enough capacity left in your injectors for a 15% increase in duty cycle this is an option for you.
Here's why this works:
A pump's volume decreases with backpressure. You've got a blower and run a lot of boost. If your baseline fuel pressure is 4-bar then that means when you get into high boost fuel pressure is exceeding 58psi by far, probably to just over 70psi. The more backpressure the pump is working against the lower volume it can provide.
In Corky Bell's "Maximum Boost" on page 95 there is a graph that plots volume (gal/hr) versus pressure (psi). According to this chart the same pump at 3 bar can deliver about 35% more fuel than one at 4 bar.
It sounds contradictory, but it isn't - less pressure = more fuel.
Here's why this works:
A pump's volume decreases with backpressure. You've got a blower and run a lot of boost. If your baseline fuel pressure is 4-bar then that means when you get into high boost fuel pressure is exceeding 58psi by far, probably to just over 70psi. The more backpressure the pump is working against the lower volume it can provide.
In Corky Bell's "Maximum Boost" on page 95 there is a graph that plots volume (gal/hr) versus pressure (psi). According to this chart the same pump at 3 bar can deliver about 35% more fuel than one at 4 bar.
It sounds contradictory, but it isn't - less pressure = more fuel.
Oct 21, 2008 | 03:01 PM
#6
Thread Starter
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
James B thank you for the awsome input, prob is I don't do my own tuning, am not near my tuner. So it would take time to get another tune right, back to me.. I am looking for a bigger inline pump to get me by untill I switch to a fuel cell setup... Err this stuff has to be so difficult, lol at least for me hahaha... T T T
Thanks again
John
Thanks again
John
Trending Topics
Oct 21, 2008 | 07:27 PM
#9
Thread Starter
Joined: Apr 2004
Posts: 16,820
Likes: 2
From: In a van DOWN BY THE RIVER
Ok thanks guys, I have been looking at them, WOW 300+ smackers, but ya got to pay to play... I am hopping I can hook this up inplace of where my walbro is now, then use this for my fuel cell set up aswell. I don't see what I couldn't
Thanks John
Thanks John
Oct 21, 2008 | 09:27 PM
#10
