Does anyone elses fuel pressure regulator fluctuate?

[AaronBND]

Put on a $150.00 regulator a month ago and it will not stay steady at 42psi. It fluctuates from 40-46psi. I will set it at 42 and go for a ride and it is either high or low the next day. Would altitude affect it? Sure makes it hard to tune by. Anyone else deal with this?

Aaron

 

[mt st helens]

It should always be the same at idle.

 

[AaronBND]

Ok, let me try again here. It stays right at 42psi when I set it and it idles, but after riding a few hours it seems to move around.

Aaron

 

[1badm1]

Mine reads different at different elevations. Could be the gauge also. I have seen as much as 7 psi difference from gauge to gauge. If you set it and its at 42 and then check it a few days later is it still at 42, or has it changed?

 

[Bacon]

They will change when elevation changes. If you set it at 5000 and go to 8000 it will change. At the same elevation it should stay the same.

 

[I_boondock]

What type of gauge are you using to check it?

 

[WyoBoy1000]

mine is set at 51, at idle it wile somtimes go up to 53 but with a little throttle drops to 51 and have never had more than 2 change from 5-11,000ft. fuel temp could cause it to move a little.

 

[TS Drag Racer]

Have mine set at 47psi at idle. After every ride when I fire it up, it stays consistant 47psi at idle. I have a really nice billet BMP gauge, wonder if your guage is defective??

 

[logchain]

temp. will change the pressure mine is set at 36 psi cold and will drop to 33 psi when under hood heat rises mine is located above the pipe so it gets more heat. I figured this out by warming the gauge with a heat gun you can watch it rise.

 

[AaronBND]

mine is set at 51, at idle it wile somtimes go up to 53 but with a little throttle drops to 51 and have never had more than 2 change from 5-11,000ft. fuel temp could cause it to move a little.

Dude, how do you not foul plugs like a mofo? Does it idle at 51psi? Mine would load up sooooooo bad if I set it that high. I have had mine on 46 and it has been fouling plugs. I am dropping mine to 42psi to tune from there. Attitude recommends tuning from 42, but I was trying to tune it at 46 just in case the box took a dump someday. It won't work! I am just running to rich even with the Attitude box backed off to stock setting on the lows and mids. Good to know temps and elevation will affect gauge a little. I thought I was going crazy. Thanks guys!

Aaron

 

[Dummy]

Regulator

What kind of reg.are you using?I Had a turbonetics on mine and i was always adjusting it,put a bosch on and set it and forget it.

 

[RockyMtn.Kris]

I use the one from Bikeman. Everytime ive checked it (in the garage at idle) its always been the same. I try to check it under the same conditions

 

[AaronBND]

What kind of reg.are you using?I Had a turbonetics on mine and i was always adjusting it,put a bosch on and set it and forget it.

I bought it from a user on here named "ptofnortn" for $160.00 a couple months ago. I PM'd a couple other people that bought from him to see what they say.

Aaron

 

[I_boondock]

Sealed gauge?

If it's using a sealed, liquid filled gauge, which it should be. It will definitely be affected by altitude changes. I used to pop the rubber stopper on mine to get it to "normalize" before taking a reading.

 

[jdrmk900]

reg

i bought a reg from the same guy as you and i set mine at 48psi in my garage at around 1400' and when i am at elevation around 6000' my gauge reads around 45psi, then returns back too 48psi again when i come back down. on average i believe you should see around 0.5 psi drop for every 1000' higher of elevation. Im running a 07 m8 with slp pipe set up with no controler and dont really have an issue of it loading up or bogging. hope this helps!!

 

[Green Cat]

I notice the same thing. It is always the same at the shop at idle, but on the mountain changes some. I figured altitude was changing the gauge reading, haven't noticed any problems.

 

[sunbather1969]

ttt

i hope you have pyros and its not right for that kind of fluctuation, my cutler does'nt jump. i'd at least put another gauge on it. and my machine runs on 48 box zeroed

 

[AaronBND]

i bought a reg from the same guy as you and i set mine at 48psi in my garage at around 1400' and when i am at elevation around 6000' my gauge reads around 45psi, then returns back too 48psi again when i come back down. on average i believe you should see around 0.5 psi drop for every 1000' higher of elevation. Im running a 07 m8 with slp pipe set up with no controler and dont really have an issue of it loading up or bogging. hope this helps!!

Are you running the stock airbox?

Aaron

 

[Arctic Thunder]

Dude, how do you not foul plugs like a mofo? Does it idle at 51psi? Mine would load up sooooooo bad if I set it that high. I have had mine on 46 and it has been fouling plugs. I am dropping mine to 42psi to tune from there. Attitude recommends tuning from 42, but I was trying to tune it at 46 just in case the box took a dump someday. It won't work! I am just running to rich even with the Attitude box backed off to stock setting on the lows and mids. Good to know temps and elevation will affect gauge a little. I thought I was going crazy. Thanks guys!

Aaron

I have mine set at 49psi. This is at 1300'. It does move around a bit with elevation. Considering a liquid isn't compressable like air. You wouldn't think it would change with elevation. But who knows.

One thing is for sure. If you set it at 42psi at your house. The next time you check it at your house it should be 42psi. If it is moving around something is wrong. Change the guage first to eliminate that posibility first.

Thunder

Thunder

 

[F_ast]

Where do the guages usually mount? Right by the tank or down by the fuel rail? anyone have pic?