45 psi too much Fuel pressure?

Signal 73

Signal 73

#2 is #1
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Jul 30, 2006
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friend of mine was told 45 is too much FP for a P-pump, was told it advances the rack too early which I would assume causes pre boost smoke.
Any discussion on this? I run 40-45 and am tempted to try lower after hearing this.
 
at idle its alot less tho. Stock LP is rpm dependent. Upper RPM's rack is forward anyways. So just curious as to the statement of at 45psi all the time if it would advance fueling prematurely.
 
Signal 73 said:
friend of mine was told 45 is too much FP for a P-pump, was told it advances the rack too early which I would assume causes pre boost smoke. Any discussion on this? I run 40-45 and am tempted to try lower after hearing this.
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yeah thats a negative, what it does i just gives it a bit more fuel in the barrels in the lower rpms which obviously will give you a little more smoke
 
Na 45psi is fine, FWIW we saw a gain of about 20hp going from 30psi to 65psi on a back to back dyno run with a guy running a aeromotive regulator on the return side that he could adjust quickly.
 
I've heard from tractor pullers that above 60 you can get some case distortion.
 
I think Fulmer said he saw no more gain going above 40psi. Think 40ish is the magic number.
 
well im gonna lower FP as far as my aeromotive regulator will let me and ill report back put this to bed maybe. :st:
 
NickTF said:
I think Fulmer said he saw no more gain going above 40psi. Think 40ish is the magic number.
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50 to 100 psi on back to back dyno runs with a gain of zero, I run 30-35 day to day and 50 with the aux system on!

Jim
 
I've got a 40psi spring on the way for my AD150. Every little bit helps! Think Ram5150 (think that's his board name) said he saw 35 hp going from 30 to 40psi supply but he runs a big 13mm pump I believe so I'd think there's be more to gain with a big pump like that vs. the non-bench 12mm deals.
 
50 to 70 psi is what is perfect, but pressure means nothing if you dont have the flow to go with it, I have been told for daily drivers, 50 is the limit because you could actually blow the seals out of the pump running high psi for extended time periods. Tim
 
How do regulators last with a 12V mech pump banging on the needle seat? I've been running an Aeromotive 13301 for awhile which definitely holds my VP inlet to 17psi, but it ticks pretty good at idle.

2008072306.jpg
 
I did the pen spring trick to the of valve and was running 45-50psi running 1800rmps and 38-42idle. I took the pen spring back out and added a carter pusher pump. 29idel 40psi around 1800rpms. Truck pulls harder with the carter on still got a little upper rmp miss. I also heard the over 45psi is hard on the seals.
 
I have been from 15-100 as well, and I couldn't really tell a difference either. I settled it at 30 psi idle, and hooked a boost reference line to my regulator for the heck of it. Works for me!
 
What kinda electric pumps are you guys running? I was thinking of a fass with the aeromotive regulator after the pump?
 
for me aeromotive A-1000 with a aeromotive 13109 in the return line -8 feed -6 return.
 
Signal 73 said:
for me aeromotive A-1000 with a aeromotive 13109 in the return line -8 feed -6 return.
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How well does the A1000 hold up. I installed a new 200gph 45psi FASS about 6 months ago. I was only using it when I dyno or race, the rest of the time it's just seeing 25-28psi from the mechanical pump. With the new p-pump I was told 45psi all the time so I have to run the FASS full time. It sounds awfull sitting at a light in traffic. Is the A1000 quiet?
 
i have the A-1000 mounted below my driver seat on the framerail with 1/4" thick rubber isolators and cannot hear it over the engine at idle.
With the pump running when you bump the starter it is quieter then any fass that I have heard in person.
As far as reliability I have run one for approx 3 years 30K miles, daily driven and track duty, 40psi, without a single issue. This is not the black "marine" pump that some say is diesel rated either.
 
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