Bigger Fuel rail yes or no?
12-07-2005, 09:01 AM
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Bigger Fuel rail yes or no?
I have a full modded turbocharged b16a1 engine with dlphi 780cc injectors with an walbro 255 fuel pump. I want to run on 23 psi. Is a bigger fuel rail needed?
Also do I have a bigger intake manifold (65mm). Is it usefull to buy a bigger throttle body? Or doesn't that mather much because it is an turbocharged engine?
Also do I have a bigger intake manifold (65mm). Is it usefull to buy a bigger throttle body? Or doesn't that mather much because it is an turbocharged engine?
12-07-2005, 10:52 AM
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Re: Bigger Fuel rail yes or no? (RyanCivic2000)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 »</TD></TR><TR><TD CLASS="quote">You probably could, but I would just pick up an aftermarket one instead, they're not that expensive.</TD></TR></TABLE>
im with him
im with him
12-07-2005, 01:00 PM
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Re: Bigger Fuel rail yes or no? (xtremecoupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xtremecoupe »</TD></TR><TR><TD CLASS="quote">I have a full modded turbocharged b16a1 engine with dlphi 780cc injectors with an walbro 255 fuel pump. I want to run on 23 psi. Is a bigger fuel rail needed?
</TD></TR></TABLE>
I agree with all the guys above. If you're looking to make a lof of HP, then a better fuel pump might be better. Just out of curiosity is it a standard 255 pump or is it the 255 high pressure? Also are you thinking about upgrading your fuel feed and return? Aftermarket fuel rails will come with larger ports, usually -8AN o-ring boss ports. You could get your stock fuel rail modified so you can attach a -6AN or maybe even -8AN line. But IMO it would be better to just get a fuel rail since they aren't that expensive anyways.
</TD></TR></TABLE>
I agree with all the guys above. If you're looking to make a lof of HP, then a better fuel pump might be better. Just out of curiosity is it a standard 255 pump or is it the 255 high pressure? Also are you thinking about upgrading your fuel feed and return? Aftermarket fuel rails will come with larger ports, usually -8AN o-ring boss ports. You could get your stock fuel rail modified so you can attach a -6AN or maybe even -8AN line. But IMO it would be better to just get a fuel rail since they aren't that expensive anyways.
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12-08-2005, 01:14 AM
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Re: Bigger Fuel rail yes or no? (BlueShadow)
I'm sorry. The fuel pump is from holley. According the specifications it can handle 255 LPH with a maximum of 650 Horsepower at 48 psi.
I agree with buying a bigger fuel rail then modify the original one.
I agree with buying a bigger fuel rail then modify the original one.
12-08-2005, 03:11 AM
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Re: Bigger Fuel rail yes or no? (xtremecoupe)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xtremecoupe »</TD></TR><TR><TD CLASS="quote">I'm sorry. The fuel pump is from holley. According the specifications it can handle 255 LPH with a maximum of 650 Horsepower at 48 psi.</TD></TR></TABLE>
oh good thing it is a Holley then, cause lately I've been hearing Walbro's aren't good for high HP setups. One thing to keep in mind though is that fuel pressure increase will decrease fuel pump volume. So to figure out your overall fuel pressure at max load or WOT and full boost you add your base fuel pressure and the amount of boost you are running The reason for that is because stock FPRs and most aftermarket non-FMU type FPRs have a 1:1 ratio. So you increase your fuel pressure by 1 psi for every pound of boost you run.
So if you are at base presssure of 45 psi, you add 23 psi which is how much boost you said you wanted to run. That gives you an overall fuel pressure of 68 psi. I couldn't find a chart of a Holley fuel pump, but using the regular Walbro 255lph and the Walbro 255lph high pressure as an example: the regular 255 flows 136lph (30 gallons per hour) at 67psi of fuel pressure, while the high pressure 255 flows 218lph (48 gallon per hour). Hopefully I used the correct gph to liter formula on onlineconversions.com. But you get the idea...that's why I asked if you had a regular 255 or a high pressure 255. Cause if it had been a regular Walbro 255 and you were gonna run 23 psi of boost, you would have probably leaned out due to lack of fuel pump flow. But since you have a Holley, I dont know if you will or not cause I cant find a good chart which shows the Holleys fuel pressure vs flow ratings.
some more info about what I'm talking about
http://www.lightningmotorsport...h.htm
oh good thing it is a Holley then, cause lately I've been hearing Walbro's aren't good for high HP setups. One thing to keep in mind though is that fuel pressure increase will decrease fuel pump volume. So to figure out your overall fuel pressure at max load or WOT and full boost you add your base fuel pressure and the amount of boost you are running The reason for that is because stock FPRs and most aftermarket non-FMU type FPRs have a 1:1 ratio. So you increase your fuel pressure by 1 psi for every pound of boost you run.
So if you are at base presssure of 45 psi, you add 23 psi which is how much boost you said you wanted to run. That gives you an overall fuel pressure of 68 psi. I couldn't find a chart of a Holley fuel pump, but using the regular Walbro 255lph and the Walbro 255lph high pressure as an example: the regular 255 flows 136lph (30 gallons per hour) at 67psi of fuel pressure, while the high pressure 255 flows 218lph (48 gallon per hour). Hopefully I used the correct gph to liter formula on onlineconversions.com. But you get the idea...that's why I asked if you had a regular 255 or a high pressure 255. Cause if it had been a regular Walbro 255 and you were gonna run 23 psi of boost, you would have probably leaned out due to lack of fuel pump flow. But since you have a Holley, I dont know if you will or not cause I cant find a good chart which shows the Holleys fuel pressure vs flow ratings.
some more info about what I'm talking about
http://www.lightningmotorsport...h.htm
12-09-2005, 05:31 PM
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im sorry but a intank 255 will not work for 650 i have seen it go to 500hp but your askin to blow someting up with that i run a sumped tank with a A1000 and that gets me in the 600hp for now
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