What fuel managment component is this?

[bmxunderground]

I have this on a shelf next to a few FMU's. I can't tell if this is an FPR or an SFMU. It's been about 4 years since it was used and I can't really remember what I got it from. I think a turbo B16 honda.

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[bigdukk2]

That my friend is an FPR, 1 in line.. 1 out line.. and a Gauge Spot with a vaccuum on top and bottom.. hope that helps

 

[bmxunderground]

on the top there is only an adjustment screw. What I was wondering is the other screw port on top, what its for. I do not have an SFMU, but I need one and I was hoping this could help. Right now, I have two FPR's and two FMU's but no SFMU. Can I set these up to work similarly? let me know....

 

[1whitegsx]

Not sure what the other port is for but I'm sure you don't need it. It should only need the 1 vacuum source on top. Im sure you know but the other screw is for the pressure adjustment. I think this guy I work with has one like this.

 

[VelocitàPaola]

That my friend is an FPR, 1 in line.. 1 out line.. and a Gauge Spot with a vaccuum on top and bottom.. hope that helps

FMU's have one input and one output too, but I agree that that's most likely an AFPR. The screw on top looks like it's for adjusting the idle/static fuel pressure.

 

[rstchris]

That would be a rise rate regulator, there is no reason for a regular fpr (1 to 1) to be so big.

 

[rstare]

As RSTChris said, that looks rather big for an AFPR. I would think it is some kind of rising rate regulator, as well. Is there any kind of identification on it at all?

 

[bmxunderground]

not at all on the unit. The fittings are all stamped earls, not Russel. Which leads me to believe it might be a Holley product. I believe the guy who left it in my garage said thats who made it. It's been 4 years though, I could be wrong.

So whats the verdict on testing methodology? I'm assuming that if the unit is a rising rate type that my fuel pressure gauge will increase accordingly under boost?

 

[rstare]

not at all on the unit. The fittings are all stamped earls, not Russel. Which leads me to believe it might be a Holley product. I believe the guy who left it in my garage said thats who made it. It's been 4 years though, I could be wrong.

So whats the verdict on testing methodology? I'm assuming that if the unit is a rising rate type that my fuel pressure gauge will increase accordingly under boost?

Eh, that doesn't necisarily mean it's a Holley product. All of my fittings are Earl's, as well, and mine isn't a Holley product.
If it's anything like Vortech's SFMU, then you should be able to take the top off, to change the disk for the rising rate. Perhaps you want to try and do that before actually trying to hook it up and test it.
If you do end up testing it, that's about the only way to. Hook it up, pressurize it (under a few psi), and watch your fuel pressure gauge.

 

[LiquidX]

Acronym question, what is a FMU and SFMU?

 

[rstare]

"FMU", Fuel Management Unit
"SFMU", Super Fuel Management Uunit
They're both Rising Rate Regulators. They increase fuel pressure according to boost. The SFMU also control your static/idle fuel pressure. That gives you the ability to use larger injectors.

 

[LiquidX]

So this would be more of a mechanical unit unlike the s/acf?

 

[rstare]

So this would be more of a mechanical unit unlike the s/acf?

Correct.

 

[LiquidX]

So even with the FMU, you would still need an electronic system to change injector flow and all right? If so, is there any reason to continue using a FMU?

 

[rstare]

So even with the FMU, you would still need an electronic system to change injector flow and all right? If so, is there any reason to continue using a FMU?

The FMU is a way to control "injector flow" without controling the injectors. It's manily used on the 420a because the SAFC does work, due to the 1 bar map sensor.
So, if you wanted to directly control injector pulsewidths on the 420a, you would have to get an ECU of some sort. MegaSquirt is about the only one that is used for this application. Most people don't want to go that in depth and are plenty happy with running 8 pounds of boost.
The FMU has a preset rising rate, which increases fuel pressure according to boost. In this case, 12:1, is the common rising rate of choice. The Walbro 255lph hp fuel pump that is used it this setup is just about maxed out pressure wise, to the amount of fuel flow needed, at 8 boost of boost. (Somewhere around 150psi of fuel pressure) So, that's why on a 12:1 FMU, you can only go up to 8psi.

 

[LiquidX]

Interesting. It's always good to learn new things, and thanks for the info.