Fuel pump turbo question
Originally posted by litlespic
What is higher level of boost???
Turboford - has hundreds of people running mid 20psi and a 255 high pressure in tank pump... and when we keep our stock 35lb injectors and t3 and run the 25psi on them... that makes ALOT of fuel pressure... and no one has ever said "shit my walbro busted" on the board since I have been a member, over a year ago...
And I know a FMU is a special type of regulator which multiples fuel by boost pressure.. say 1.8 or 1.4 or how ever you do it.. but how much pressure do you really expect?? we have a base of 40 and thats stock.. Ive seen some run a base of about 60 with that same 25psi of boost... which is about 85psi of fuel and ran a 10.. with stock injectors and turbo...
I do agree.. an inline is helpful but dont say walbro's suck for high pressure.. you just have to get the HIGH PRESSURE one so it doesnt stop flowing fuel at high pressures...
What is higher level of boost???
Turboford - has hundreds of people running mid 20psi and a 255 high pressure in tank pump... and when we keep our stock 35lb injectors and t3 and run the 25psi on them... that makes ALOT of fuel pressure... and no one has ever said "shit my walbro busted" on the board since I have been a member, over a year ago...
And I know a FMU is a special type of regulator which multiples fuel by boost pressure.. say 1.8 or 1.4 or how ever you do it.. but how much pressure do you really expect?? we have a base of 40 and thats stock.. Ive seen some run a base of about 60 with that same 25psi of boost... which is about 85psi of fuel and ran a 10.. with stock injectors and turbo...
I do agree.. an inline is helpful but dont say walbro's suck for high pressure.. you just have to get the HIGH PRESSURE one so it doesnt stop flowing fuel at high pressures...
okay, well now you have, my WALBRO crapped out on me, so did a gsx pump that i had, they are only rated to something like a max of 70 psi , something really low which is why pretty much all turbo kits with fmu's come with inline pumps, my fmu is a 12-1 ratio, 12psi of fuel pressure for every 1 psi of boost so when im running 12 lbs of boost on the street everyday and 15 at the track, on top of my 36 psi stock pressure (which is taken care of by the stock intank pump) im somewhere in the 120-140psi range on my low boost setting, chahonda has showed me the walbro intank high pressure fuel pump and it still wasnt enough to make me feel comfortable to run it, i was going lean with the gsx pump, i was going lean with the WALBRO both around 4500 rpm when im hitting full boost now with my stock intank fuel pump and my nos inline pump, im running fat on 15 psi at 6k rpm, this is just my experience and i never said that the walbro sucks, i just said i wouldnt run an intank pump without hondata or some other sort of engine management where such high pressure isnt used, but whatever, im saying what i think is right to the question he asked.........
Well.. I take back everything I said.. had no idea you ran THAT much... I thought 80's were high...
But why do you need 12.1 fmu?? we do fine with a 1.1 at 15-25 psi of boost... are we doin something wrong... just not seeing why you need 12 and we only need 1..
Im not trying to be a dick... I just like to know.. I want to try a sr20 or a ka24 one day and that is out of my league right now on the technologie side of things.. so Im trying to learn
But why do you need 12.1 fmu?? we do fine with a 1.1 at 15-25 psi of boost... are we doin something wrong... just not seeing why you need 12 and we only need 1..
Im not trying to be a dick... I just like to know.. I want to try a sr20 or a ka24 one day and that is out of my league right now on the technologie side of things.. so Im trying to learn
dude just get a walbro 255LPH. That shit is cheap compared to others and it will work just fine. To top it off, it'll be brand new for about $100. On another note:
This is my take on fuel enrichment, mostly on Honda systems of pre-7th gen civics and i-VTEC: The best way to increase fuel supply to your cylinder is to get bigger injectors. Higher pressure does not "necessarily" mean higher INJECTOR fuel flow. It just means that more volume is trying to go through the fuel rail, but not necesarily being burnt. The injectors are just like orifices lined up on the rail. Most fuel pressure gauges are mounted on the inlet side of the rail anyway which in theory should increase flow to the fuel rail, then the injectors. The injectors will still pulse on what the ECU is telling it to do.
Last edited by thermal; Jul 23, 2003 at 02:10 AM.
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