D12BHP Posted September 4, 2008 Share Posted September 4, 2008 Hi all, I have a forced induction Z having problems with over fueling?! I have stock fuel pump and a addtional Walbro pump is this to much ... See spec for the car below... Any advise would help - I guess the piggy back ECU I have is not helping the problem.... Cheers Quote Link to comment Share on other sites More sharing options...
Stew Posted September 4, 2008 Share Posted September 4, 2008 Go see the tuner! Quote Link to comment Share on other sites More sharing options...
jonb Posted September 5, 2008 Share Posted September 5, 2008 +1 speak to whoever installed the SC Normally the FPR bleeds excess pressure back to the fuel return so it shouldn't matter how high the supply pressure to that is - assuming you mean you have two pumps working in parallel supplying the fuel line >> (instead of one for the swirl pot and one for the fuel line in series) I've never heard of needing a walboro in addition to a stock pump rather than just having one bigger one instead. But I'm not that familiar with what's needed for the hp you have. Running rich is one possible symptom of a broken FPR but no more likely than a faulty air sensor, stuck injector, bad map, etc etc. Basically the question, spec and information is a bit too vague. -- edit - alright, I read some of your other posts. You've said already that tuners you've spoken to say the Daz-tech ECU isn't up to the job ... I suggest you swap the wheels/repaint money for a visit to a good garage who will either install and map whatever ECU is needed or find the source of the problem if that isn't it. Quote Link to comment Share on other sites More sharing options...
Chris`I Posted September 5, 2008 Share Posted September 5, 2008 +1 speak to whoever installed the SC Normally the FPR bleeds excess pressure back to the fuel return so it shouldn't matter how high the supply pressure to that is - assuming you mean you have two pumps working in parallel supplying the fuel line >> (instead of one for the swirl pot and one for the fuel line in series) I've never heard of needing a walboro in addition to a stock pump rather than just having one bigger one instead. But I'm not that familiar with what's needed for the hp you have. Running rich is one possible symptom of a broken FPR but no more likely than a faulty air sensor, stuck injector, bad map, etc etc. Basically the question, spec and information is a bit too vague. -- edit - alright, I read some of your other posts. You've said already that tuners you've spoken to say the Daz-tech ECU isn't up to the job ... I suggest you swap the wheels/repaint money for a visit to a good garage who will either install and map whatever ECU is needed or find the source of the problem if that isn't it. All very good points. As Stew has said, go see a reputable tuner to see what they suggest. It could be many things as jonb says, so we cant really diagnose and fix it over the internet. With FI installs you really need to have a reputable tuner you can go to for this stuff. Quote Link to comment Share on other sites More sharing options...
D12BHP Posted September 5, 2008 Author Share Posted September 5, 2008 Thanks for the comments!.... wanted to see if it was a common problem or ????? I here Dan from AdvanceMe is good.... Quote Link to comment Share on other sites More sharing options...
M13KYF Posted September 5, 2008 Share Posted September 5, 2008 I here Dan from AdvanceMe is good.... +1 Quote Link to comment Share on other sites More sharing options...
H5 Posted September 5, 2008 Share Posted September 5, 2008 Yep, Dan seems very knowledgeable Quote Link to comment Share on other sites More sharing options...
Guest prescience Posted September 5, 2008 Share Posted September 5, 2008 +1 speak to whoever installed the SC Normally the FPR bleeds excess pressure back to the fuel return so it shouldn't matter how high the supply pressure to that is - assuming you mean you have two pumps working in parallel supplying the fuel line >> (instead of one for the swirl pot and one for the fuel line in series) I've never heard of needing a walboro in addition to a stock pump rather than just having one bigger one instead. But I'm not that familiar with what's needed for the hp you have. Running rich is one possible symptom of a broken FPR but no more likely than a faulty air sensor, stuck injector, bad map, etc etc. Basically the question, spec and information is a bit too vague. -- edit - alright, I read some of your other posts. You've said already that tuners you've spoken to say the Daz-tech ECU isn't up to the job ... I suggest you swap the wheels/repaint money for a visit to a good garage who will either install and map whatever ECU is needed or find the source of the problem if that isn't it. The Vortech as specd provides a separate 155 Walbro (note not usual 255) in line and controlled via boost (1lbs boost to 6-8 lbs extra fuel pressure depending on Vortech year/spring rating) Just to advise on the original question, the 155/stock combination is good for up to about 450BHp - I assume you don't have that because it's most unlikely you would be over-fuelling and developing a true 475 as per your sig. If you have a 255 and 530 injectors then you have enough fuel potential and as mentioned it's simply a tuning issue to adjust the fuel injector cycle (time each injector it is spurting fuel) -the larger your injectors (and assuming you have enough fuel delivery capability which with 255 you should have) the shorter the cycle time needs to be at give rpm etc Quote Link to comment Share on other sites More sharing options...
M13KYF Posted September 8, 2008 Share Posted September 8, 2008 dorian Quote Link to comment Share on other sites More sharing options...
Sarnie Posted September 8, 2008 Share Posted September 8, 2008 dorian glad you understood any of that! Quote Link to comment Share on other sites More sharing options...
M13KYF Posted September 9, 2008 Share Posted September 9, 2008 dorian glad you understood any of that! not the slightest Quote Link to comment Share on other sites More sharing options...
Guest prescience Posted September 9, 2008 Share Posted September 9, 2008 dorian glad you understood any of that! not the slightest Me neither Quote Link to comment Share on other sites More sharing options...
Stew Posted September 9, 2008 Share Posted September 9, 2008 I hope he doesn't have 475 as I believe it's on stock internals! Glad you had a more constructive and informative than mine Dorian! Quote Link to comment Share on other sites More sharing options...
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