B&M CommandFlo Fuel Pressure Modifier

[tsiboosted]

I came across a good deal on this B&M FPR and was wondering if anyone has had any experience with it or already installed it before? I also got the B&M Fuel Pressure Guage from ExtremePSI. Just curious like I said if anyone ahd installed these before. Thanks.

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[shwinp]

I've had both the guage and FPR - No compaints - It does what it's made to do and the install is easy. Just remember that you can only increase fuel pressure.

 

[tsiboosted]

shwinp - Thanks man. Is the install pretty simple? I know you have to cut something off the old fuel regulator to get it to work. It said it in the instructions anyway. Is that true and how hard is that to do? In your experience, did the guage work well with the regulator? Thanks for the help.

 

[steve]

There is plenty of information on the command flow in the archives.
We have to ask you what your trying to solve with it. In most DSM cases if won't fix anything and you would be better off putting your money elsewhere.

The gauge kit is fine but benefits from drilling out the hole to the banjo to improve fuel flow.

Steve

 

[tsiboosted]

steve - I didnt pay anything for it. Someone asked if I could use them and I said yes. I know somewhere on here in some past threads, I saw where a fuel pressure regulator would help out in bottom end tourque soom. Increasing the pressure anyway. Am I wrong on that one? What are you talking about drilling a hole in the Banjo? Help me out with that one. Thanks for the help too guys. REALLY appreciate it.

 

[steve]

I know somewhere on here in some past threads, I saw where a fuel pressure regulator would help out in bottom end tourque soom. Increasing the pressure anyway. Am I wrong on that one?

I can't imagine a correctly working AFPR making any difference in bottom end torque over the stock FPR.

What are you talking about drilling a hole in the Banjo? Help me out with that one. Thanks for the help too guys. REALLY appreciate it.

There is a hole in the side of the bolt where the fuel passes to the banjo fitting on the hose to the rail. The hole is a little small so drill it out to match the hole in the stock bolt.

Steve

 

[tsiboosted]

Gotcha man. Maybe I read the thread wrong. i cant really remember. I gotta get out of here. Work is done for the day. Thank you for all the help with this guys. Im sure I'll be asking some more on it tomorrow. Install on Saturday. I may do a write up on it and submit it to the tech thread. L8R...

 

[daren_p]

This item as said can only raise fuel pressure if thats what your looking for. If your looking for it to work with a larger fuel pump this isn't the one to get, since all it does is modifies the stock regulator making it adjustable but not increasing the ability the return the extra fuel from larger fuel pumps such as the walbro 255. This one will over run the same as the stock unit, if you want one for a larger pump you need to look into an aeromotive unit.

 

[tsiboosted]

daren - Ok. I do have a 255 fuel pump. Its not a walbro it is a fuel pump out of a 3000GT VR4 Twin Turbo. It actually has the same specs (give or take) as the Walbro 255. I guess I should just sell this thing and keep the fuel pressure guage then eh?

 

[daren_p]

daren - Ok. I do have a 255 fuel pump. Its not a walbro it is a fuel pump out of a 3000GT VR4 Twin Turbo. It actually has the same specs (give or take) as the Walbro 255. I guess I should just sell this thing and keep the fuel pressure guage then eh?

Ya I'd sell it & use the cash for a "real" fpr. If you are using a larger pump, which you are/will be, this isn't what you need. The only use of the b&m unit would be if you were still running the stock fuel pump & wanted to increase your fuel pressure for more fuel.

 

[tsiboosted]

Yeah sounds good to me man. I can put up for like 30 or 40 bucks. I looked it up and thats about how much they go for. Any recomendations for a "Real" FPR ? Thanks for all the help man. With the gauge I have (B&M) can I use it without an aftermarket FPR or do I have to have one for it to work properly? Thanks again.

 

[steve]

daren - Ok. I do have a 255 fuel pump. Its not a walbro it is a fuel pump out of a 3000GT VR4 Twin Turbo. It actually has the same specs (give or take) as the Walbro 255.

The VR4 pump while a nice pump upgrade isn't anywhere close to a 255l/p pump. It's more line 180 l/h new and like all pumps, less as it gets older. I run one and have been using the old spoolin up/charges air AFPR but it also works acceptibly with the stock FPR. Without rewiring using the stock FPR the base fuel pressure is within factory specs.

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From http://www.stealth316.com/2-fuelpumpguide.htm

Steve

 

[GPTourer]

I think the only OEM pump worth it is the Supra one, but I do not know what it is rated at. I don't understand why the Commandflo is even offered by DSM vendors, because I don't see a scenario where you would need one?

 

[DSM90AWD]

I think the only OEM pump worth it is the Supra one, but I do not know what it is rated at. I don't understand why the Commandflo is even offered by DSM vendors, because I don't see a scenario where you would need one?

For those instances where you'd like to get a bit more milage from smaller injectors (Buschur ran 50psi base FP with 550s to get 10s) and in 1G applications where the stock fuel pressure is much lower (36psi) than the the industry standard 43psi rating of injectors.

Using the formula SQRT(New PSI / 43PSI), a 550cc/min injector flows:

503cc/min @ 36psi = 319HP @100% DC
550cc/min @ 43psi = 349HP @100% DC
593cc/min @ 50psi = 377HP @100% DC

As your ECU is calibrated to your stock fuel injector size / base fuel pressure, any deviation to either would need to be compensated via an AFC or EPROM mod

On the subject, I ran a Walbro190 for years with the B&M and had no problems tuning with my 13-sec 16G setup.

 

[tsiboosted]

Thanks for the info there guys. The car just came with the VR4 fuel pump so I saw no reason at this point to upgrade it. It was brand new when it was put in an that was in Janruary when I bought the car, so its only 6 months old. I guess I will just wait a little longer before I start doing any more mods to the car. Everything now to me is a little expensive when I have other more important things on my plate. I appreciatte ALL the help guys. Thank you.

 

[daren_p]

For those instances where you'd like to get a bit more milage from smaller injectors (Buschur ran 50psi base FP with 550s to get 10s) and in 1G applications where the stock fuel pressure is much lower (36psi) than the the industry standard 43psi rating of injectors.

Using the formula SQRT(New PSI / 43PSI), a 550cc/min injector flows:

503cc/min @ 36psi = 319HP @100% DC
550cc/min @ 43psi = 349HP @100% DC
593cc/min @ 50psi = 377HP @100% DC

As your ECU is calibrated to your stock fuel injector size / base fuel pressure, any deviation to either would need to be compensated via an AFC or EPROM mod

On the subject, I ran a Walbro190 for years with the B&M and had no problems tuning with my 13-sec 16G setup.

Yes, most people say they don't have a problem with the 190 pump with the stock fpr (B&M would be the same), its not till you get up to the 255 pump that you over run the stock fpr.

 

[tsiboosted]

So I am just going to ditch the FPR. Can I still install the guage or would that just be ###? Or should I jsut wait to install that later when I DO need an FPR?

 

[snox135]

So I am just going to ditch the FPR. Can I still install the guage or would that just be ###? Or should I jsut wait to install that later when I DO need an FPR?

Installing the gauge now won't hurt anything. It might even save your motor someday. Since someone puts a different fuel pump in the car it won't be a bad idea to monitor the fuel pressure. I have a buddy who bought a car with a different fuel pump. They must have messed up the install because about 6 months later she lost fuel pressure while driving (no gauge) and burned down the motor.

 

[GPTourer]

Is it the type the screws directly into the AFPR? Maybe you can use it with the stock fuel set up by getting a fitting and putting it on the filter or on the stock fuel rail, but I think I would just wait until I upgraded.

 

[tsiboosted]

Its the B&M guage. I am guessing it will screw into it. It actually has not arrived yet. I ordered from ExtremePSI and they are in Penn and I am in FLA so Im sure it will take a few days to get here. I was hoping it would get here before the weekend so I could put it in.

 

[daren_p]

Ya might as well install the gauge now, so you can keep an eye on the fuel pressure. I believe the b&m gauges come with a banjo bolt so you can install it ontop of the factory fuel filter mounted on the firewall.

 

[tsiboosted]

daren - Kewl man. Yeah I hope it comes in today so I can install this weekend. We have ANOTHER tropical storm coming our way so I will need something to do this Saturday. Probably wont be able to stray TOO far from home. GOTT LOVE living in Florida.

 

[GPTourer]

We have ANOTHER tropical storm coming our way so I will need something to do this Saturday. Probably wont be able to stray TOO far from home. GOTT LOVE living in Florida.

I think it is going to miss you guys and come into the gulf, and then roll right through us like Ivan did. The sad part is, this is just the beginning of what is probably going to be a long season.

Once you do have a big fuel pump and a true AFPR you'll be able to get your car to idle a much smoother and get some of your gas mileage back. I'm thinking of getting an in-car gauge so I can make sure the pressure is rising 1:1 with boost.

 

[rsr93]

So I am just going to ditch the FPR. Can I still install the guage or would that just be ###? Or should I jsut wait to install that later when I DO need an FPR?

Just put both on there is nothing wrong with that fpr.... i see in your profile you are running 550's @ 15 psi ...... if you wanted to turn up your boost that fpr will give you that extra fuel control to add some if you wanted to boost more. later on if you get bigger injectors & a turbo you wont be able to regulate down but im sure you will buy some sort of afc, vpc, dsmlink, to control fuel when you get that far.

i would put it on and boost up for a little more power and fun.
i see no downside with it. i have both and they get the job done.

and yep that TS is coming right for us in the p-cola area.

 

[steve]

Just put both on there is nothing wrong with that fpr.

There is very little right about it either.

I see in your profile you are running 550's @ 15 psi. if you wanted to turn up your boost that fpr will give you that extra fuel control to add some if you wanted to boost more. later on if you get bigger injectors & a turbo you wont be able to regulate down but im sure you will buy some sort of afc, vpc, dsmlink, to control fuel when you get that far.

i would put it on and boost up for a little more power and fun.
i see no downside with it. i have both and they get the job done.

He can turn up the boost until he runs out of injector right now. Then raising the fuel pressure will give him some room. But you need to pull fuel out to adjust for the higher pressure, just like you have to when going to larger injectors. Since he running 550s, I'd hope he already has an SAFC.

The downside is the cost vs functionality. Better to invest more into something with some life to it that this deadend part.

Steve