Turbobug65
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« on: July 03, 2011, 12:22:09 pm » |
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I have a 1915 draw through turbo motor. I have a Holley blue for a pump, A boost refreanced Aeromotive reg, with a 1 to 1 ration. The problem I'm having is when I set fuel pressure at idle, then go drive the car off boost, the fuel pressure stays good. As soon as i get on the boost,( i would say above 5lbs) they car runs out of fuel. I look at the gauge on the reg, it reads 0 psi but the car still runs, and I can even drive it but not on boost. I've gone through 3 pressure guages on the reg. I called Aeromotive and talk to a guy that told me about the internal bypass built into the Holley blue that is set at 7psi. Basically im asking the pump to go past that 7 psi and then the bypass comes into play. so he told me about a spring that Morroso sells that turns that 7psi bypass into 19psi. I changed it out and seemed to fix my issue, untill yesterday, WTF! same thing happened. I'm running -10 from the tank to reg, then -6 from reg to carb. I also have a return line to the tank. Any ideas guys? I have talked to a few respected PRA racers and they are baffled. Please help.
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mmccarthy
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« Reply #1 on: July 03, 2011, 05:44:21 pm » |
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May want to check your vent system for the tank, possibly clogged. Mike McCarthy
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PRO OUTLAW SEVWA
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Ohio Tom (DdK)
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« Reply #2 on: July 03, 2011, 08:48:53 pm » |
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Hmmm. For me a Regular holley 7psi pump with one of their cheap regulators should be able to feed enough fuel for that carb no problem.
Why do you have the fuel regulator boost referenced? The Holley should be fine just running 6-7psi at the carb all the time.
What kind of HP are you looking to make?
what about float level settings? They are trickey to setup.
What are the symptoms when she runs out of fuel?
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Ohio Tom Simpson. Home of the Killa' Bee.
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Dominick Luppino
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« Reply #3 on: July 03, 2011, 08:56:40 pm » |
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Hmmm. For me a Regular holley 7psi pump with one of their cheap regulators should be able to feed enough fuel for that carb no problem.
Why do you have the fuel regulator boost referenced? The Holley should be fine just running 6-7psi at the carb all the time.
What kind of HP are you looking to make?
what about float level settings? They are trickey to setup.
What are the symptoms when she runs out of fuel?
X2... |
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Marty
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« Reply #4 on: July 04, 2011, 12:16:04 am » |
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Marty
staggsracing.com
m-specmotorsports.com
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Turbobug65
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« Reply #5 on: July 04, 2011, 01:29:31 am » |
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X3
[/quote
Hey Marty, this set up is from you actually from a few years back. I was having the same problem and you brought me a new reg at the track at a Drag day event. I've been chasing the same problem since. My buddy Muffler Mike seems to think maybe a vacum problem pulling the reg closed, I'm going to try and crack the fitting going to the boost side of the reg to bleed off some of the vacum and see if that solves anything, this is on a 45 weber side draft. |
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IN RANGE inc.
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« Reply #6 on: July 04, 2011, 10:37:19 pm » |
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You need to make sure you are running a vacuum check valve in your line to your regulator. OR you may have yours backward?
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OH, well?
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Turbobug65
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« Reply #7 on: July 05, 2011, 01:03:10 am » |
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You need to make sure you are running a vacuum check valve in your line to your regulator. OR you may have yours backward?
No check valve required, its an Aeromotive reg that is built for boost referncing not like when you mod a Holley reg. Had one of those first with the same problem. Could the turbo be pulling to much vacum and closing the reg off? I'm going to try and crack the boost line going to the reg and see if that bleeds off any vacum when the guage is reading 0 psi. |
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« Last Edit: July 05, 2011, 01:06:12 am by Turbobug65 »
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Turbobug65
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« Reply #8 on: July 05, 2011, 01:13:13 am » |
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Hmmm. For me a Regular holley 7psi pump with one of their cheap regulators should be able to feed enough fuel for that carb no problem.
Why do you have the fuel regulator boost referenced? The Holley should be fine just running 6-7psi at the carb all the time.
What kind of HP are you looking to make?
what about float level settings? They are trickey to setup.
What are the symptoms when she runs out of fuel?
It's boost refrenced because I'm running a 45 side draft, good for no more 3psi with glass ball needle and seat. It's only a 1915 so the HP isnt crazy but good for a low 11. Not sure on float levels, never checked them but that dosent have anything to do with fuel coming to the reg. |
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Turbobug65
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« Reply #9 on: July 05, 2011, 11:29:52 pm » |
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Ok I think I figured it out. I have always set the reg @ 3 psi with the vacum line off of the reg. So I figured out that at idle,1000rpm the turbo is pulling 12inches of vacum. Remember I set the fuel pressure at 3psi on a 45 side draft with the vacum line off. As soon as I put the pressure line back on the reg. The pressure would go to 0. Ok so now, with the pressure line off of the reg, I set the pressure to 6 psi, put the pressure/ vacum line on and the pressure went to 2 psi, perfect. Went out and got on it and man it seams to be a whole differant motor. Transitions through the gears nice and seems to pull harder. I also noticed in 3rd gear cruising at 3000rpm the gauge was showing me 25 inches of vacum, what do you guys get? Man I hope my problems are finally behind me.
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« Last Edit: July 05, 2011, 11:32:20 pm by Turbobug65 »
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A.J.Sims
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« Reply #10 on: July 06, 2011, 01:23:59 pm » |
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If your going to go back to the 80's and run a side draft then you should add a PCV valve to the boost port or line going to the regulator. With out you will go insane, constantly adjusting the regulator from engine vacuum influenzing and changing your setting.
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Have Fun!!
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Turbobug65
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« Reply #11 on: July 07, 2011, 10:10:25 pm » |
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If your going to go back to the 80's and run a side draft then you should add a PCV valve to the boost port or line going to the regulator. With out you will go insane, constantly adjusting the regulator from engine vacuum influenzing and changing your setting.
[/quote
Yes sir your correct. I put a new check valve in today and so far so good. I just wish I could see what my pressure is under boost. |
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Ohio Tom (DdK)
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« Reply #12 on: July 07, 2011, 10:11:32 pm » |
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Agreed, add the check valve. I just set one up today on a 40 Dell side draft.
Summit racing sells check valves with pipe thread on either end. Makes it nice to adapt to AN fittings and whatever you may have.
I ended up mounting the modified regulator right on the carb so that the customer can just feed 15psi fuel pressure to the engine, and not worry about setting it up. I already have it done and tested before he gets the motor in his car.
Side draft setups are old school for sure. I love them thou. They drive really well for a mild street/strip setup. They do take some serious but simple mods to make them work right.
In my 2110cc turbo street car, my little 40 side draft runs 11.30's in my full weight street sedan.
Plus, the don't suffer so much of the loading up issues that the big holley manafolds seem to have.
I can drive the thing all day long and she never acts up.
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Ohio Tom Simpson. Home of the Killa' Bee.
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IN RANGE inc.
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« Reply #13 on: July 07, 2011, 10:36:52 pm » |
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Everyone knows you can't make power or go fast with a side draft!!! Too old school!!!
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OH, well?
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Turbobug65
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« Reply #14 on: July 10, 2011, 03:19:29 am » |
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Everyone knows you can't make power or go fast with a side draft!!! Too old school!!!
I beg to differ. I'll be out at the next Drag day. |
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Ohio Tom (DdK)
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« Reply #15 on: July 10, 2011, 10:12:53 pm » |
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Ohio Tom Simpson. Home of the Killa' Bee.
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Turbobug65
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« Reply #16 on: July 11, 2011, 04:10:36 pm » |
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Tom, thanks for sharing. I've gotten a lot of bugs worked out. I currently am getting 10lbs on 91, looking to get to 15lbs. I'm starting to love my car again.
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Turbobug65
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« Reply #18 on: July 12, 2011, 02:58:30 pm » |
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Turbobug65
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« Reply #19 on: July 25, 2011, 04:08:20 pm » |
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Plastic check valve failed after only running yhe car 4 times, sucked fhe flapper right out of it. A aluminum housed check ball is on its way. It is rated a 100psi, at vacum or boost. Should have that problem again.
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