Anyone using a 2:1 Boost FPR?
Anyone using a 2:1 Boost FPR? I can't find a good 2:1 Fuel Pressure Regulator. Anyone using one? Im thinking about running a 2:1 FPR with the 96lbs injectors on a stock PCM so we can start around 30psi of fuel pressure and let it go up to 60-66psi with 15-18psi. The idea is to make the 96lbs injectors idle as best as possible.
I dont think ive ever seen one. I know of 1:1 which im pretty sure you are looking for but maybe not...A good 1:1 would be all you would need with those injectors anyhow to about 1200 hp. Let me know if Im wrong. Id like to look into the 2:1 if they do exist.
What you want is an FMU. I have a really nice one that I never used, but it's 1/8 NPT fittings. You want 1/4 NPT.
http://www.cartech.net/fmu2020.htm
http://www.cartech.net/fmu2020.htm
Originally Posted by Zombie
What you want is an FMU. I have a really nice one that I never used, but it's 1/8 NPT fittings. You want 1/4 NPT.
http://www.cartech.net/fmu2020.htm
http://www.cartech.net/fmu2020.htm
The link doesnt work for some reason.
Why would you want to do this? Will the 96# injectors not supply enough fuel on their own w/ a std 1:1 regulator?
If thats the case, raise base fuel pressure and adjust with the pcm.
It would be interesting getting the pcm to get along with an FMU increasing the static flow rate of the injector as boost comes up.
Besides, FMU's are a bandage for people trying to run boost on a stockish motor with stock PCM programming.
If thats the case, raise base fuel pressure and adjust with the pcm.
It would be interesting getting the pcm to get along with an FMU increasing the static flow rate of the injector as boost comes up.
Besides, FMU's are a bandage for people trying to run boost on a stockish motor with stock PCM programming.
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Originally Posted by Fire67
Why would you want to do this? Will the 96# injectors not supply enough fuel on their own w/ a std 1:1 regulator?
If thats the case, raise base fuel pressure and adjust with the pcm.
It would be interesting getting the pcm to get along with an FMU increasing the static flow rate of the injector as boost comes up.
Besides, FMU's are a bandage for people trying to run boost on a stockish motor with stock PCM programming.
If thats the case, raise base fuel pressure and adjust with the pcm.
It would be interesting getting the pcm to get along with an FMU increasing the static flow rate of the injector as boost comes up.
Besides, FMU's are a bandage for people trying to run boost on a stockish motor with stock PCM programming.
If i run the current 1:1 I only can run 45psi as the lowest FP and then it will only go up to 60-63psi at redline. The car won't idle as good down low and I will be limited to how much fuel i can get up top because im only seeing 15-18psi.
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yea an FMU sounds like your best bet. Have you noticed any tuning problems with the 96# injectors with the 1:1 FPR?
thats what my setup basically is, but i havent really had enough time to mess with it
thats what my setup basically is, but i havent really had enough time to mess with it
Exactly, reducing the fuel pressure much under 42 psi will only result in worse quality. Id put it at 42, and reference 1:1 from there. If you cant get the 96's to idle good something is wrong, and if it idles at 13:1 sometimes you have to give soemthing up for a 1000 rwhp capable injector.
Originally Posted by Old Geezer
At 30# FP, the spray pattern will be less than desireable. [Not "pretty" to start with] .That would not enhance idle quality.
Spray pattern or not at very low pulsewidths changing the fuel pressure wont make that much of a difference.
I can go from 30 to 70psi at idle and the a/f hardly changes (i run open loop at idle).
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
Originally Posted by Zombie
What you want is an FMU. I have a really nice one that I never used, but it's 1/8 NPT fittings. You want 1/4 NPT.
http://www.cartech.net/fmu2020.htm
http://www.cartech.net/fmu2020.htm
I personally have an Aeromotive that's hooked via a nitrous plug directly into my INTAKE. This way I'm at 58PSI till boost kicks in, then it's a 1:1 increase from there. It's making the tuning process much easier than having it drop below 58PSI at vacuum and then spiking over at 1bar MAP.
Anyhow, interested in opinions why FMU over FPR.
Originally Posted by LSs1Power
The 96lbs can supply all the fuel I need with 60psi+ of fuel pressure, but the point of the 2:1 regulator is to run a very low FP on the 96lbs injectors something like 30psi to make it idle good and then increase the the fuel by 2:1 so I can get close to 60-66psi of FP at redline to supply me with the fuel needed at 15-18psi.
If i run the current 1:1 I only can run 45psi as the lowest FP and then it will only go up to 60-63psi at redline. The car won't idle as good down low and I will be limited to how much fuel i can get up top because im only seeing 15-18psi.
If i run the current 1:1 I only can run 45psi as the lowest FP and then it will only go up to 60-63psi at redline. The car won't idle as good down low and I will be limited to how much fuel i can get up top because im only seeing 15-18psi.
Let the PCM control fuel via pulsewidths, FMU's are bandaids for the people who wanna do FI but cant afford to do it right.
Originally Posted by kp
Spray pattern or not at very low pulsewidths changing the fuel pressure wont make that much of a difference.
I can go from 30 to 70psi at idle and the a/f hardly changes (i run open loop at idle).
I can go from 30 to 70psi at idle and the a/f hardly changes (i run open loop at idle).
Yep, because the pcm is in control of A/F and will adjust on its own. You lower FP, the pcm increases pulsewidth and vice versa.
LSs1Power- We see what your trying to do, but your going about it wrong. You need to set base FP to get your total desired flow, let the 1:1 reg compensate for manifold pressure, and let the PCM do its job of controlling fuel.
By my experience as well as a few others, FMU's are inconsistant and flat out unreliable. Fuel systems are not meant to gradually increase flow on there own, they should always rely on the PCM to regulate flow via pulsewidths.
Originally Posted by Fire67
Yep, because the pcm is in control of A/F and will adjust on its own. You lower FP, the pcm increases pulsewidth and vice versa.
LSs1Power- We see what your trying to do, but your going about it wrong. You need to set base FP to get your total desired flow, let the 1:1 reg compensate for manifold pressure, and let the PCM do its job of controlling fuel.
By my experience as well as a few others, FMU's are inconsistant and flat out unreliable. Fuel systems are not meant to gradually increase flow on there own, they should always rely on the PCM to regulate flow via pulsewidths.
LSs1Power- We see what your trying to do, but your going about it wrong. You need to set base FP to get your total desired flow, let the 1:1 reg compensate for manifold pressure, and let the PCM do its job of controlling fuel.
By my experience as well as a few others, FMU's are inconsistant and flat out unreliable. Fuel systems are not meant to gradually increase flow on there own, they should always rely on the PCM to regulate flow via pulsewidths.
Originally Posted by Fire67
Yep, because the pcm is in control of A/F and will adjust on its own. You lower FP, the pcm increases pulsewidth and vice versa.
LSs1Power- We see what your trying to do, but your going about it wrong. You need to set base FP to get your total desired flow, let the 1:1 reg compensate for manifold pressure, and let the PCM do its job of controlling fuel.
By my experience as well as a few others, FMU's are inconsistant and flat out unreliable. Fuel systems are not meant to gradually increase flow on there own, they should always rely on the PCM to regulate flow via pulsewidths.
LSs1Power- We see what your trying to do, but your going about it wrong. You need to set base FP to get your total desired flow, let the 1:1 reg compensate for manifold pressure, and let the PCM do its job of controlling fuel.
By my experience as well as a few others, FMU's are inconsistant and flat out unreliable. Fuel systems are not meant to gradually increase flow on there own, they should always rely on the PCM to regulate flow via pulsewidths.
It just seems (at least on my car) at very low pulsewidth fuel pressure doesnt make a huge difference in idle afr. I'l leave the explanation to the engineer types
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Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Originally Posted by Old Geezer
At 30# FP, the spray pattern will be less than desireable. [Not "pretty" to start with] .That would not enhance idle quality.
Originally Posted by kp
Spray pattern or not at very low pulsewidths changing the fuel pressure wont make that much of a difference.
I can go from 30 to 70psi at idle and the a/f hardly changes (i run open loop at idle).
I can go from 30 to 70psi at idle and the a/f hardly changes (i run open loop at idle).
I would tend to agree with Old Geezer too.
KP...weird that you can alter your fuel pressure so much, withouth changing AFR's
Even a 10psi change in my FP, will show an easily noticeable change in AFR's at idle.
Originally Posted by stevieturbo
I would tend to agree with Old Geezer too.
KP...weird that you can alter your fuel pressure so much, withouth changing AFR's
Even a 10psi change in my FP, will show an easily noticeable change in AFR's at idle.
KP...weird that you can alter your fuel pressure so much, withouth changing AFR's
Even a 10psi change in my FP, will show an easily noticeable change in AFR's at idle.
Didnt think of open loop... But my point was that altering FP for idle quality shouldnt be done, rather the pcm should be able to handle it with proper tuning.
kp-
You wouldnt happen to have a copy/screen capture/anything of what your injector offsets looked like with the 75's would you? A .bin would be nice, but I most likely wouldnt be able to open it as I use LT1edit.
kp-
You wouldnt happen to have a copy/screen capture/anything of what your injector offsets looked like with the 75's would you? A .bin would be nice, but I most likely wouldnt be able to open it as I use LT1edit.