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boost reference fuel pressure regulators ????????????* *DELETED* *DELETED* #1482960
08/11/13 06:00 PM 08/11/13 06:00 PM
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ohio
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Post deleted by itsallgood

Last edited by itsallgood; 08/15/13 09:04 PM.
Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482961
08/11/13 06:04 PM 08/11/13 06:04 PM
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Crizila Offline
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Look at the fuel press gauge. It should be reading boost plus what ever you set the fuel pressure at at idle ( no boost ). I have used an in car camera so I can see the boost gauge and fuel pressure gauge at the same time.

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Re: boost reference fuel pressure regulators ???????????? [Re: Crizila] #1482962
08/11/13 06:10 PM 08/11/13 06:10 PM
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Crizila Offline
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Another way to do it is make a pass and look at the boost gauge going through the lights. Make another pass and look at the fuel press gauge going through the lights. If you are running 15 lbs of boost and you set the fuel press a 7 lbs at idle, your fuel pressure gauge should be reading 22 lbs going through the lights. Make sure your boost reference line is large enough. Think I use a -4 line.

7810591-blrmtr2.jpg (48 downloads)
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Re: boost reference fuel pressure regulators ???????????? *DELETED* [Re: Crizila] #1482963
08/11/13 06:22 PM 08/11/13 06:22 PM
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ohio
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Post deleted by itsallgood

Last edited by itsallgood; 08/11/13 09:24 PM.
Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482964
08/11/13 06:31 PM 08/11/13 06:31 PM
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Romeo MI
MR_P_BODY Offline
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Quote:

on the trans brake i here the turbos wine but the fuel pressure stays the same and the car shuts off



You have issues then... make sure of the line going
to the regulator is working... all its doing is supplying
pressure on the back of the diaphragm to assist the spring
Re: boost reference fuel pressure regulators ???????????? *DELETED* [Re: MR_P_BODY] #1482965
08/11/13 06:51 PM 08/11/13 06:51 PM
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ohio
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Post deleted by itsallgood
Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482966
08/11/13 09:22 PM 08/11/13 09:22 PM
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this time with the line off the carb hat fuel pump on blow some compressed air bye the line fuel pressure raised up 10 # so it sounds like it works vacumn lines to small

Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482967
08/11/13 09:33 PM 08/11/13 09:33 PM
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Romeo MI
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Quote:

this time with the line off the carb hat fuel pump on blow some compressed air bye the line fuel pressure raised up 10 # so it sounds like it works vacumn lines to small



Even a small line should react.. just slower to respond

Re: boost reference fuel pressure regulators ???????????? [Re: MR_P_BODY] #1482968
08/11/13 10:16 PM 08/11/13 10:16 PM
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ok thanks
Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482969
08/11/13 11:37 PM 08/11/13 11:37 PM
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TRENDZ Offline
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What is the source of boost to the regulator? Is it above the throtlle plates or below?

"use it 'till it breaks, replace as needed"
Re: boost reference fuel pressure regulators ???????????? [Re: TRENDZ] #1482970
08/12/13 12:05 AM 08/12/13 12:05 AM
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ahy Offline
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Quote:

What is the source of boost to the regulator? Is it above the throtlle plates or below?



The boost reference should be what the injectors are seeing inside the manifold (assuming they are in the manifold). Manifold pressure - below the throttle plates.
Re: boost reference fuel pressure regulators ???????????? [Re: TRENDZ] #1482971
08/12/13 09:18 AM 08/12/13 09:18 AM
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Quote:

What is the source of boost to the regulator? Is it above the throtlle plates or below?
the source is above the tp off the carb hat like crizila posted pic


Re: boost reference fuel pressure regulators ???????????? [Re: ahy] #1482972
08/12/13 09:20 AM 08/12/13 09:20 AM
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Quote:

Quote:

What is the source of boost to the regulator? Is it above the throtlle plates or below?



The boost reference should be what the injectors are seeing inside the manifold (assuming they are in the manifold). Manifold pressure - below the throttle plates.

this is a blow thu carb setup

Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482973
08/12/13 01:17 PM 08/12/13 01:17 PM
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Andrews,In. U.S.of A.
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In the hat, above the throttle blades. Go to youtube,fuel pressure on the left. http://www.youtube.com/watch?v=BVlmtgYb72U

Last edited by 67_Satellite; 08/12/13 10:56 PM.
Re: boost reference fuel pressure regulators ???????????? [Re: ahy] #1482974
08/12/13 09:40 PM 08/12/13 09:40 PM
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Quote:

Quote:

What is the source of boost to the regulator? Is it above the throtlle plates or below?



The boost reference should be what the injectors are seeing inside the manifold (assuming they are in the manifold). Manifold pressure - below the throttle plates.



Carb application... I assumed FI. Comment above not applicable!
Re: boost reference fuel pressure regulators ???????????? [Re: ahy] #1482975
08/13/13 09:49 AM 08/13/13 09:49 AM
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Oakland, MI
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dizuster Offline
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You said that you can "hear" the turbos on the trans brake, but is it making boost?

My turbo will make LOTS of noise well before I actually see the boost gauge move.
Re: boost reference fuel pressure regulators ???????????? [Re: dizuster] #1482976
08/13/13 10:56 AM 08/13/13 10:56 AM
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canot get in to boost on the t brake just as the gauge gets to about o boost the car dies.
Re: boost reference fuel pressure regulators ???????????? [Re: all spooled up] #1482977
08/13/13 01:20 PM 08/13/13 01:20 PM
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Oakland, MI
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It sounds to me like somethting else is wrong besides the regulator. Even if the fuel pressure regulator wasn't working, you will still get some fuel flow to the bowls even if the regulator doesn't increase with boost. It would still have nearly full fuel flow at 0psi of boost.

Do you have an A/F meter on it? Does it go fat or lean? Is it possible the spark table is screwed up causing it to do something funny when it gets to 0psi?

Are you stomping the pedal on the brake and it dies, or are you easing into it and it dies? If I stomp mine, it bogs and doesn't really recover at all, I need to foot brake it a little before getting on the brake.
Re: boost reference fuel pressure regulators ???????????? [Re: dizuster] #1482978
08/13/13 03:03 PM 08/13/13 03:03 PM
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furious70 Offline
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Quote:

You said that you can "hear" the turbos on the trans brake, but is it making boost?

My turbo will make LOTS of noise well before I actually see the boost gauge move.


x2 on that. Mine sounds like a jet on the tarmac before the gauge dips into boost, if you didn't have the gauge you'd swear it was boosting.
I'm EFI, but I have a tiny vac line behind the throttle blades for mine and it idles down the fuel psi under vac and goes 1:1 up when into boost. The reference line size wasn't an issue for me at least. I temporarily removed my under hood gauge and put it on the end of the 3' braided line tucked under my wiper arm to verify things were kosher.

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Re: boost reference fuel pressure regulators ???????????? [Re: furious70] #1482979
08/13/13 03:54 PM 08/13/13 03:54 PM
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Crizila Offline
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Quote:

Quote:

You said that you can "hear" the turbos on the trans brake, but is it making boost?

My turbo will make LOTS of noise well before I actually see the boost gauge move.


x2 on that. Mine sounds like a jet on the tarmac before the gauge dips into boost, if you didn't have the gauge you'd swear it was boosting.
I'm EFI, but I have a tiny vac line behind the throttle blades for mine and it idles down the fuel psi under vac and goes 1:1 up when into boost. The reference line size wasn't an issue for me at least. I temporarily removed my under hood gauge and put it on the end of the 3' braided line tucked under my wiper arm to verify things were kosher.

A little bit different with a blower. Boost is immediate. Fuel pressure rise better be immediate - along with your water injection if it is signaled by boost pressure. Same thing on the other end with your dump valve. It better open as soon as the throttle blades close.

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