terribleturner Posted January 28, 2006 Share Posted January 28, 2006 What are peoples thoughts on a fuelling system that feeds either end of the rail with it's own pump?? I was thinking a of a system that would Y both pumps together and then Y them back off at the rail. Anything that people like or don't like about the each pump for each end idea?? Quote Link to comment Share on other sites More sharing options...
LeeT Posted January 28, 2006 Share Posted January 28, 2006 What are peoples thoughts on a fuelling system that feeds either end of the rail with it's own pump?? I was thinking a of a system that would Y both pumps together and then Y them back off at the rail. Anything that people like or don't like about the each pump for each end idea?? you can do it either way. i personally have gone for dual lines using 6an ss hose. if you go the single route just make sure you use a big enough hose like 8an. Quote Link to comment Share on other sites More sharing options...
baz78 Posted January 28, 2006 Share Posted January 28, 2006 I have three pumps and two lines/ tripple hanger:drool: Quote Link to comment Share on other sites More sharing options...
Jake Posted January 28, 2006 Share Posted January 28, 2006 I have three pumps and two lines/ tripple hanger:drool: James, Why do you need two pumps? Are you going bigger than T67? What would happen if one pump fails? I'm going to kit it simple with 1x Walbro, PE650 injectors, stock rail, stock FPR, no FPD Bypass. Quote Link to comment Share on other sites More sharing options...
LeeT Posted January 28, 2006 Share Posted January 28, 2006 James, Why do you need two pumps? Are you going bigger than T67? What would happen if one pump fails? I'm going to kit it simple with 1x Walbro, PE650 injectors, stock rail, stock FPR, no FPD Bypass. hes got a T66. i think a 67 would be borderline on one pump Quote Link to comment Share on other sites More sharing options...
TLicense Posted January 28, 2006 Share Posted January 28, 2006 Has anyone actually measured any fuel pressure drop off, which they've managed to directly attribute to the pump not being able to supply enough volume of fuel? Quote Link to comment Share on other sites More sharing options...
Jake Posted January 28, 2006 Share Posted January 28, 2006 hes got a T66. i think a 67 would be borderline on one pumpI believe Ian C makes a genuine and safe 600bhp on a T67 and one Walbro. Quote Link to comment Share on other sites More sharing options...
Alex Posted January 28, 2006 Share Posted January 28, 2006 Yeah he does Jake - 8an Line from 1x Walbro. Splits to a dual 6AN fed rail using the stock return. T67 running 720's and 1.4bar of boost (580bhp at the wheels) Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 28, 2006 Share Posted January 28, 2006 Has anyone actually measured any fuel pressure drop off, which they've managed to directly attribute to the pump not being able to supply enough volume of fuel? Not exactly, but when we first put the single on my car, (T67 with PE650's), I had two maps done for my E-manage. The race fuel map was set-up at 1.8 bar of boost, and the fuelling showed no signs of dropping off. (I'm purposely not quoting any power figures ). However, at TOTB last year my pump started to die and couldn't flow enough fuel to keep up with 1.7 bar. It was immediatly apparent there was a problem as car was running lean after 4krpm. No matter what fuelling adjustments I made, it would still run lean. After changing the pump, all was well again. (well, it wasn't, 'cause I'd adjusted the E-manage to chuck more fuel in, so it's initial run was stonkinly rich!). So whilst there's no actual measurements taken, it can be fairly obvious. Edited to add, you could also see the fuel pressure increasing as boost increased to a point, then the fuel pressure started to drop off as the pump couldn't keep up... Quote Link to comment Share on other sites More sharing options...
terribleturner Posted January 28, 2006 Author Share Posted January 28, 2006 I heard from several people now that 2 pumps isn't neccassary, but i'm also thinking that if i am pussing it and that ONE pump goes on me, if i go dual i will still have the 2nd to get me home. Im gonna put either 720's or 780's in the rail and have the 2nd pump come on on full boost (or when it feels it's needed). So there's nothing wrong with having 2 pumps with their own lines and fuel filters to either end of the rail?? It's just not a way i have read about yet and just want some clarification. Quote Link to comment Share on other sites More sharing options...
Jake Posted January 28, 2006 Share Posted January 28, 2006 but isn't there a danger that if the car is set up for two fuel pumps and one fails the mixture might well go very lean, very quickly? I'm sure I remember a discussion about this once. Think it was Ian or Dude. Quote Link to comment Share on other sites More sharing options...
Alex Posted January 28, 2006 Share Posted January 28, 2006 2 pumps IS more dangerous than 1. I'd rather get towed home if the one fails, rather than run lean and blow the engine. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 28, 2006 Share Posted January 28, 2006 but isn't there a danger that if the car is set up for two fuel pumps and one fails the mixture might well go very lean, very quickly? I'm sure I remember a discussion about this once. Think it was Ian or Dude. Correct. At least if one pump fails, the car just stops, not melts. Obviously if you are going for BIG power, (600+++), then yes you need two pumps. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 28, 2006 Share Posted January 28, 2006 2 pumps IS more dangerous than 1. I'd rather get towed home if the one fails, rather than run lean and blow the engine. Damn I type slow! Quote Link to comment Share on other sites More sharing options...
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