i have an ls motor turbocharged. i have the walbro 255lph fuel pump and my fuel pressure at idle is like at 59psi. i am using the stock fuel pressure regulator also.
do i need to get an adj FPR to turn the fuel pressure down?

 

That's pretty high for a stock motor, I had mine at 53psi on stock fpr and that was to high, it was running rich. But for a turbo motor I wouldn't turn it down at all, go tune it and the tunner will know what to do.

 

i run rich when i hit boost cause the fuel pressure rises when it reads boost. therefore, wouldn't i need to turn it down some so i won't run too rich? i'm thinking it should be more like 45psi at idle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by leadfoot78 &raquo;</TD></TR><TR><TD CLASS="quote">That's pretty high for a stock motor, I had mine at 53psi on stock fpr and that was to high, it was running rich. But for a turbo motor I wouldn't turn it down at all, go tune it and the tunner will know what to do. </TD></TR></TABLE>

thats completely bad information. Just do what we suggested you to do in your other thread. TURN IT DOWN.


Rob
Rob

 

Since when telling some one to tune their car is bad information??? If the psi is 59 with the stock fpr why should he turn it down?? Add a turbo and turn down the fuel pressure??? yeah that’s going to get him far! What if he is already running lean in the higher rpm? Untill he knows for sure he shouldn't turn it down at all. Get a fuel controller not an fpr and go to the dyno. I wish I had a vfac when I went for dyno tuning. I had a lean spike at around 6k and rich the rest of the way, I couldn't turn down the psi much cuz it was making me run dangerously lean at 6k. So I'm still running rich. If u have a similar spike and run too lean the turbo will tear your ls up. Rich is always safer than lean, u should turn the psi down if the motor is struggling and u can smell fuel all the time, but if it's running smooth I wouldn't touch it. Tune it, it's the best thing you can do to your ls.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by leadfoot78 &raquo;</TD></TR><TR><TD CLASS="quote">Since when telling some one to tune their car is bad information??? If the psi is 59 with the stock fpr why should he turn it down?? Add a turbo and turn down the fuel pressure??? yeah thatÂ’s going to get him far! What if he is already running lean in the higher rpm? Untill he knows for sure he shouldn't turn it down at all. Get a fuel controller not an fpr and go to the dyno. I wish I had a vfac when I went for dyno tuning. I had a lean spike at around 6k and rich the rest of the way, I couldn't turn down the psi much cuz it was making me run dangerously lean at 6k. So I'm still running rich. If u have a similar spike and run too lean the turbo will tear your ls up. Rich is always safer than lean, u should turn the psi down if the motor is struggling and u can smell fuel all the time, but if it's running smooth I wouldn't touch it. Tune it, it's the best thing you can do to your ls. </TD></TR></TABLE>

59 is extremely high static fuel pressure.

since when did a turbo car at idle require more fuel than an NA car? never..

its not running right, its way rich and bogging.

tunning wasnt your bad idea, static FP of 59 psi is your bad idea, of course it is not going to run right with that much fuel at idle, of course its going to unload. Your right get it tunned, but do get a FPR. If he is lean at one point and rich at another, you will need to add fuel to the map or subtract it, not just run gobs of fuel through a raised FPR and hope that you are still within the window when your lean part of the map comes around.

FACT
you need a way to tune your fuel,like a fuel controller.
and with a standing 59 psi of fuel, you need to turn that down. At idle, regardless of the fact that it is turbo, he cant use 59 psi of fuel. In case you have not noticed, the car is not in boost at idle. You need added fuel into boost and the transition, NOT THE ENTIRE MAP!

Rob

 

The reason your fuel pressure is so high is due to the fuel pump. Yes 59psi is way to high your going to cause more problems with it that high then you will be fixing (lean condition at 6k needed to be adressed in another way). your fuel pressure should be about 36-40psi at idle. Your stock fpr cannot flow enough fuel back to the tank so it causes a restriction which in turn raises the fuel pressure..so yes if your going to keep that pump get a aftermarket fpr (like an aem) to lower the fuel pressure

 

I am having this same problem on my d16y8 JRSC. The fuel won't go below 50psi. I was going to pick up the SARD FPR from http://www.options.com Has anyone had any luck with this FPR?

 

if you can't get it lower than 50psi, then you'll need an adj fpr just like i do.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16ahybrid &raquo;</TD></TR><TR><TD CLASS="quote">The reason your fuel pressure is so high is due to the fuel pump. Yes 59psi is way to high your going to cause more problems with it that high then you will be fixing (lean condition at 6k needed to be adressed in another way). your fuel pressure should be about 36-40psi at idle. Your stock fpr cannot flow enough fuel back to the tank so it causes a restriction which in turn raises the fuel pressure..so yes if your going to keep that pump get a aftermarket fpr (like an aem) to lower the fuel pressure</TD></TR></TABLE>
^^^

Best idle pressure would be in the stock range.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93hb &raquo;</TD></TR><TR><TD CLASS="quote">i have an ls motor turbocharged. i have the walbro 255lph fuel pump and my fuel pressure at idle is like at 59psi. i am using the stock fuel pressure regulator also.
do i need to get an adj FPR to turn the fuel pressure down?</TD></TR></TABLE>

Get the aem fpr, I had the same problem so I bought a b&m regulator. That thing sucked, it couldnt hold the pressure so I bought a aem regulator and havent had problems since!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J.R. &raquo;</TD></TR><TR><TD CLASS="quote">

Get the aem fpr, I had the same problem so I bought a b&m regulator. That thing sucked, it couldnt hold the pressure so I bought a aem regulator and havent had problems since!!!</TD></TR></TABLE>

so AEM is the ****?

what about SARD? http://www.optauto.com/webstor...=1084

 

I didn't know he was bogging. If he is he should turn it down, but I wouldn't hit boost that way. Since he was at 59psi with a stock fpr the pump must be making the psi go up. My peressure was at 53psi with a Walbro 190lph and stock fpr, that was way to much for my motor too.

Oh and my B&M is working perfect at 45psi, it went down to 40 too but that was too lean, maybe u installed it wrong.

 

yeah...my car is bogging and not running good. i just got back from riding around and my car wasn't feeling good at all at 10psi.
i set it back to 7psi and the car pulled hard even with the fuel pressure at 59psi. it was still running a little rich, but not as rich as it was when i had it at 10psi though. i will be getting a fpr wednesday and will be setting it at 45psi. then i will try 10psi again to see how the car runs. should run a lot better when i turn the fuel pressure down.

this was posted by 93hb under a friends username

 

If you need fpr, then buy something like this: https://honda-tech.com/zerothread?id=638777

 

i dont know too much about fuel so i wanna ask these questions. I know your car should be around 40psi at idle.

1. Does a Hondata have anything to do wtih fuel pressure, or it all in the FPR, pump, injectors, ect.

2. When you have an adjustable FPR, do you see what the pressure is at IDLE and then adjust up/down from there to get it 35-40psi?

And from there, does the FPR do the rest of the work like, adjusting 1psi per lb. of boost? I just didnt know how all the adjustments worked on fuel pressure and all that. thanks!

 

I idle at 50psi with 440cc injectors!

 

I idle at 43psi . with 770cc injectors.

 

thats nice and all that you guys are happy about your fuel pressure, but ya think my question could get answered? haha.

 

1. Does a Hondata have anything to do wtih fuel pressure, or it all in the FPR, pump, injectors, ect.

No, hondata does not control your fuel pressure. Your FPR and pump will though.

2. When you have an adjustable FPR, do you see what the pressure is at IDLE and then adjust up/down from there to get it 35-40psi?

yes, adjust it at idle.

FPR do the rest of the work like, adjusting 1psi per lb. of boost? I just didnt know how all the adjustments worked on fuel pressure and all that.

Depends what type of FPR it is. With EMS you want a 1:1 ratio. If you have an fmu with a 12:1 disk you are rising hte fuel pressure rate per psi of boost.

 

Okay sounds like i was on the right track. So if i have an Aeromotive FPR and my little gauge, i just set my idle pressure at around 35-40psi, then from there the Aeromotive will adjust 1:1 correct? thanks for the info!