Drivetrain Where to buy a larger fuel rail and high flow pump ?
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i know i should not need a bigger rail or the pump .... but the car is running out of fuel at high rpm and pings hard.
the only way i can think of fixing it is to increase fuel preasure.
the car has a 15% pulley , cold air intake , header , tuned exhaust , 380cc injectors and a giac tune .
i do plan on going for a big valve head and cam by the end of the year. so getting the pump and rail now would not hurt.
can you guys send me a link to where i can get the parts from ... PM me if you like .
the only way i can think of fixing it is to increase fuel preasure.
the car has a 15% pulley , cold air intake , header , tuned exhaust , 380cc injectors and a giac tune .
i do plan on going for a big valve head and cam by the end of the year. so getting the pump and rail now would not hurt.
can you guys send me a link to where i can get the parts from ... PM me if you like .
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That combo should not be running out of fuel depending on RPM you are spinning it to.
How many miles on the car?
Fuel filer may be dirty or injectors need cleaning or both, thats where I'd start.
There are quite a few cars running around with the system you propose, adding 440 injectors when going with an RMW tune. None have needed to go with a bigger pump or rail.
How many miles on the car?
Fuel filer may be dirty or injectors need cleaning or both, thats where I'd start.
There are quite a few cars running around with the system you propose, adding 440 injectors when going with an RMW tune. None have needed to go with a bigger pump or rail.
#18
If you're running Helix's 380cc injectors, you're probably starting to run lean because they don't flow as much as they should. Get a set of JCW 380's or RMW 440's; both actually flow their rated amount.
On my previous single-turbo R53, I ran 560cc/min injectors on the stock fuel rail and pump with upwards of 318wHP and have never had any fuel starvation or lean running. The problem you're running into, I assure you, is not the rail or pump, it's the Flash and the injectors.
#19
This is not a fuel system issue that can be solved with a dual pump or return plumbed system as Ryephile says. I run 28psi all day long on the stock system and ran really FAT up top without tuning the 440s I have Way Way back down. I think the guys suggesting fuel filter or a pump failure are closer on. The stock MINI pump really only runs one pressure when you are on the air pedal and if it is failing you might get this problem, but going to an aftermarket system if you are putting out under 400whp is probably the supreme overkill.....FWIW.......
I don't even post anymore.......
so why should someone listen to me.........
Just saw Rye's most recent post......The spray pattern is also gonna be critical to what injectors you are using, but that tends to give you the problems I was having with an incomplete burn and FAT rather than lean.....
I don't even post anymore.......
so why should someone listen to me.........
Just saw Rye's most recent post......The spray pattern is also gonna be critical to what injectors you are using, but that tends to give you the problems I was having with an incomplete burn and FAT rather than lean.....
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i have not thrown any codes that i know of .... and i am running jcw 380cc injectors bought from helix. i never had the car on a dyno so i have no idea what the air/fuel ratio is at high rpms. the car did improve by doing the injectors , but it is not right yet. the shop i took it to said the knock sensor would retard the timing up to 30% untill the car fell on its face running out of fuel around 5000 rpm and up. that was before i got the injectors. now it is fine if i take off fast from a stop and run through the gears.... pings a bit than begins to stumble a bit at high rpm. it pings too much if i step on it hard when its under load.
Last edited by RatBlast; 02-12-2008 at 09:49 PM.
#21
I had my Helix 380's flow tested before Jan's tune and passed with flying colors.
Thanks anyways.
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Sorry...typo back there..
I did mean Fuel Filter
Look at the easy inexpensive stuff first. Not that getting to the filter is that easy. but 82k miles it may be an issue. There are people here that would love to see you go out and buy the latest Fire hose sized fuel rail and 540 injectors just to see if it works. With you current setup and it's potential the 380's are not your limiting factor, I'd be looking else ware.
I did mean Fuel Filter
Look at the easy inexpensive stuff first. Not that getting to the filter is that easy. but 82k miles it may be an issue. There are people here that would love to see you go out and buy the latest Fire hose sized fuel rail and 540 injectors just to see if it works. With you current setup and it's potential the 380's are not your limiting factor, I'd be looking else ware.
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i have not thrown any codes that i know of .... and i am running jcw 380cc injectors bought from helix. i never had the car on a dyno so i have no idea what the air/fuel ratio is at high rpms. the car did improve by doing the injectors , but it is not right yet. the shop i took it to said the knock sensor would retard the timing up to 30% untill the car fell on its face running out of fuel around 5000 rpm and up. that was before i got the injectors. now it is fine if i take off fast from a stop and run through the gears.... pings a bit than begins to stumble a bit at high rpm. it pings too much if i step on it hard when its under load.
Jeremy