Fuel Pressure questions
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Fuel Pressure questions
Ok Ive had my car setup at 40lbs on my rising rate fpr on stock injectors. After doing some math by bumping it up to 55lbs it would effectivly push the 550s to about 640cc and the 850s right at 1000cc That would be enough fuel to push a little bit more boost. Im curious is it safe to run 55lbs on the stock fuel system? I have had my injectors cleaned and flowtested by rc so im not worrying about those.. Im just curious if running that much extra pressure would cause leaks..
Matt
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I would worry about your fuel pump crapping out. Even at 15 psi, you are going to pushing your fuel pump to 70 psi, at which point most fuel pumps are crying "uncle".
Are you telling us that you are still running the stock injectors with a T-78?
Are you telling us that you are still running the stock injectors with a T-78?
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So I take it even with a nice fuel pump running the fuel pressure regulator any higher than 40psi its going to make the pump "cry uncle" ?
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I'm not saying that it WILL (the HKS is a good pump), but that it may. All pumps will drop off in flow at higher pressures.
Check the flow rate of the big Apexi pump here, for example:
http://www.maxcooper.com/rx7/parts_i...exi_bnr32.html
How much boost are we talking here?
Check the flow rate of the big Apexi pump here, for example:
http://www.maxcooper.com/rx7/parts_i...exi_bnr32.html
How much boost are we talking here?
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Remember you also have to account for line pressure drop. If I remember correctly Max Cooper's calculator lists it as 15psi. So 55 psi fuel pressure gradient+15psi of boost+15psi of fuel system pressure drop=85psi
My advice is use Max's calculator to figure out what you need the pump to do then look at pump dyno charts. From what I remember from doing these caculations for my own car I think 55psi will put you beyond the capacity of the nippo, cosmo, and walbro pumps.
My advice is use Max's calculator to figure out what you need the pump to do then look at pump dyno charts. From what I remember from doing these caculations for my own car I think 55psi will put you beyond the capacity of the nippo, cosmo, and walbro pumps.
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Originally posted by Godzilla-T78
Thanks jspecracer7
Thanks jspecracer7
#12
Hi guys.
Who can help me. I m building my FD for some drag passes.
i would like to tell you first my mods :
stock moter with 2mm seals
stock turbos without problems with k+n filters
greedy fmic
koyo rad
hks twin power
magnecor i6 bit wires
3 inch full ex
sard fuel pump 280lt/h in tank
sard f/p regul
apexi pfc
My problem is : how many psi is correct to run my sard fp regulator ? My intention is to run 1.1bar first turbo - 1.0 bar both turbos !
Thanks.
Who can help me. I m building my FD for some drag passes.
i would like to tell you first my mods :
stock moter with 2mm seals
stock turbos without problems with k+n filters
greedy fmic
koyo rad
hks twin power
magnecor i6 bit wires
3 inch full ex
sard fuel pump 280lt/h in tank
sard f/p regul
apexi pfc
My problem is : how many psi is correct to run my sard fp regulator ? My intention is to run 1.1bar first turbo - 1.0 bar both turbos !
Thanks.
#13
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Originally posted by sevenin7
Hi guys.
Who can help me. I m building my FD for some drag passes.
i would like to tell you first my mods :
stock moter with 2mm seals
stock turbos without problems with k+n filters
greedy fmic
koyo rad
hks twin power
magnecor i6 bit wires
3 inch full ex
sard fuel pump 280lt/h in tank
sard f/p regul
apexi pfc
My problem is : how many psi is correct to run my sard fp regulator ? My intention is to run 1.1bar first turbo - 1.0 bar both turbos !
Thanks.
Hi guys.
Who can help me. I m building my FD for some drag passes.
i would like to tell you first my mods :
stock moter with 2mm seals
stock turbos without problems with k+n filters
greedy fmic
koyo rad
hks twin power
magnecor i6 bit wires
3 inch full ex
sard fuel pump 280lt/h in tank
sard f/p regul
apexi pfc
My problem is : how many psi is correct to run my sard fp regulator ? My intention is to run 1.1bar first turbo - 1.0 bar both turbos !
Thanks.
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