| Brian Santefort |
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| #1 |
Howard, I had talked to you before about the Pontiac Racepump...But this is about my Chevrolet SBC with a blow-through turbo.
I have a Aeromotive return Reg. 1.1 boost referenced. The racepump supplies the reg. with -8 Fuel lines. I have the idle pressure set at 6.5 psi and it also has a -8 return line to the tank. When Under the boost the engine is running out of fuel at 5-6 psi of boost. Do I need to restrict the return line down to the fuel tank? The boost reference seems to work fine as the pressure goes up...But the gauge is under the hood and I cant see it while driving to see what is going on during the exact problem.
The carburetor is a 575 cfm Demon Blo-thru and the engine is a stock motor besides the turbo. So I thought the pump would be overkill. But right now I'm not sure. The Aeromotive reg. Part number is 13301.
Otherwise the pump seems to work great and the car runs awesome most of the time otherwise.
Its possible that the boost is overcoming what the reg. is set at and I need to just turn up the idle pressure more. But I wanted to make sure the return line is not messing with the way the pump makes pressure.
Thanks, Brian Santefort
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| Howard |
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| #2 |
Brian,
The Aeromotive bypass style regulators just don't work with the Race Pump....yours actually appears to work better than the others I've seen.
Their bypass has a spring to control pressure, the Race Pump has a spring to control volume, and they don't communicate well causing erratic and/or low pressure.
The recommended combinaton is the EFI pump and the 5024 regulator. You can update your pump to EFI specs by installing a $10.00 spring available under "service parts" on the website.
Howard Stewart
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| Brian Santefort |
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| #3 |
Howard,
Thank You for your prompt service! I recieved the parts yesterday. I do have one more question, The boost reference....I am using a tiny nipple on the side of my incorrect reg. Can I thread that in where you have the allen screw on the side of the top tower for the 5024 Reg.?
It says that the top of the adjuster for the fuel pressure is the place to hook up the boost line. But I am using a rubber 3/16" vacumn line that wont hook up there without another fitting.
I do however have a -4 Blockoff cap at home I can put on the top to close that off.
Is that a bad idea or should I go buy a braided line?
ThanKs! Brian R. Santefort
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| Howard |
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| #4 |
Brian,
The boost reference is a -3 AN. You can cap this off and install the 1/8" barbed fitting in place of the 10/32 plug.
We use the -3 AN because a vacuum hose on the barbed fitting tends to blow off when you create boost.....dropping the fuel pressure.
Howard Stewart
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| Brian Santefort |
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| #5 |
Howard,
I have the Regulator all set up and ready to go! I bought two "weld-On" fittings (male) today from the local specialist. One is a -4 the other a -8 I removed the idle bleed jet and we turned the threads off in the lathe, Then we TIG welded the -8 Fitting onto the idle bleed fitting...I cooled it down and reassembled, Whala now its a -8 return with a Holley jet in it...
The top for the boost reference we turned down in the lathe and TIG welded the -4 Male piece onto where the -3 used to be...(I dont have much -3 available around this area) Now I can use the parts I already own.
I also bought a 3rd fitting -4 to weld to my self made carb. hat to send the boost signal to the reg. So I should never have to worry about losing that signal reference due to a hose blowing off.
You were right about a -4 to -8 adapter....Shown in the book at times but none available in real life. So thats why I used the weld on style fittings. They really made life easy!
Now all thats left is putting the spring in the pump and hooking up the lines and the fuel pressure gauge.
Thanks! Brian
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| josh whitcomb |
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| #6 |
i experienced a similar problem with my blowthrough turbo sbc, in my mustang... basically, 150 psi pump, 5024 regulator, and the 70 jet in the return allowed too much fuel to bypass, letting me only make between 7 and 8 psi boost with out running out of fuel pressure. yes a 70 jet is tiny, but it wasnt small enough, so i found a 60 jet and instantly my under boost fuel pressure allowed @12 psi boost safely. i am curious as to your set up. mine is very junkyardish, yet very functional. 10.709 @ 133 on 15 psi, pumpgas, street tires, driven to the track.please contact me @ 91turbolxcoupe on http://www.streetfire.net. i have tons of pictures of my setup. |
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| Brian Santefort |
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| #7 |
Josh,
My set-up is also home made and I am running 15# of boost also. The car runs awesome with the racepump and seems to have no problems other than my transmission & traction.
I have not finished the install of the dead head regulator. I have been dealing with other problems with the car and so it still has the 13301 Aeromotive return regulator and the 51 PSI pump on it. Its working fine since I turned the idle fuel pressure up to 7.5 PSI. But I am leaning out on the top end some. Most likely because I have not installed the correct reg. and the 150PSI pump spring.
I appreciate the heads up on the idle bleed. I can be found on http://www.theturboforums.com under the screen name flynbrian. I am not a member of the streetfire site.
I guess I need to hurry up and put the new parts on I bought from Howard. As they are just sitting in the trunk in the boxes.
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| Brian Santefort |
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| #8 |
I finally got around to putting in the 150 PSI spring, That was very easy to do, I also installed the boost referenced regulator. Its running and seems to work just fine.
I adjusted the fuel pressure at a very high idle since I dont have a tach and I had to almost screw the adjuster all the way in to make 6.5 pounds of pressure with no reference hooked up.
It definately fuels the car faster now and the fuel is there on demand when the reg. sees boost much quicker than before. The car seems like it needs rejetted again because there is more fuel available all the time. My idle AFR's went from 14.30-14.7 to 12.4 I think I need to recheck my float levels again also.
Will putting in a smaller idle bleed jet make for more idle fuel pressure with less tightening of the adjuster?
I cannot test drive the car right now because its running good enough to eat transmissions and its being rebuilt again with a better convertor that wont balloon this time. I cant wait to drive it with this set-up!
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| Howard |
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| #9 |
Brian,
The ball sits lower on the boost reference regulators for carbureted applications with the EFI pump. 7 PSI is about 6 turns in vs. 4 turns for the other regulators. The instruction sheets fail to address this.
I never changed the bleed jet.
Thanks!
Howard Stewart
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| Brian Santefort |
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| #10 |
Howard,
I finally have all the parts in place and the all the pesky parts of the car that had been giving me fits repaired. After driving the car for a few hours one evening the car started loading up and stumbling. I checked the fuel pressure and it went up at idle from like 6 psi to around 9-10 psi. I whipped out some wrenches and re-adjusted the pressure back down now its perfect again. I scratched my head a little thinking about it but its not messed up since.
How right you were about the bypass reg. This car is a monster, no more leaning out on the top end, no more lean pops, It just flat out goes fast. I am really glad I bought your 5024 Reg. with idle bleed. It was the missing piece to the puzzle. I show the pump off often and explain the reason for the 5024 reg. and people are suprised it made such a difference. I want to say the Pump with the upgrade kit and the 5024 Reg. is perfect for a Blow Thru Turbocharged Small Block Chevy.
I would never think of using a electric or belt pump over this unit, Its simple and makes perfect sense.
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