Idle fuel flow
06-07-2007, 02:37 PM
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Idle fuel flow I was reading a writeup a while back that explained how you could lower your idle fuel flow. I haven't been able to find it with the search and i was wondering if anybody else may have seen it. I was in the middle of looking for something else when I ran across and lost track of it. Has anyone else seen this?
06-12-2007, 12:51 PM
#4
what do you mean by lower idle fuel flow? you dont really get to decide on how much fuel it needs. it needs what it needs, dependent on laws of physics and chemical properties of air and fuel. the only way to 'lower' fuel consumption at idle is to fiddle with rpm and idle spark so it creates the lowest MAP at idle, as that indicates the lowest airmass, thus it has to be matched to the lowest amount of fuel required to operate properly. most of the time with the fuel systems we have we deal with the opposite, we dump too much fuel because injectors we use have a higher minimal pulse width than what a normally idling car would need. at this point we're forced to raise rpm to the point where the air consumed matches well to the minimal possible amount of fuel that injectors at given fuel pressure can do.
still, what does idle fuel flow has to do with 'good power'?
still, what does idle fuel flow has to do with 'good power'?
06-12-2007, 04:07 PM
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Originally Posted by RedHardSupra
what do you mean by lower idle fuel flow? you dont really get to decide on how much fuel it needs. it needs what it needs, dependent on laws of physics and chemical properties of air and fuel. the only way to 'lower' fuel consumption at idle is to fiddle with rpm and idle spark so it creates the lowest MAP at idle, as that indicates the lowest airmass, thus it has to be matched to the lowest amount of fuel required to operate properly. most of the time with the fuel systems we have we deal with the opposite, we dump too much fuel because injectors we use have a higher minimal pulse width than what a normally idling car would need. at this point we're forced to raise rpm to the point where the air consumed matches well to the minimal possible amount of fuel that injectors at given fuel pressure can do.
still, what does idle fuel flow has to do with 'good power'?
still, what does idle fuel flow has to do with 'good power'?
This caught my eye a few weeks ago and I have not been able to find it again. I was looking for something else when I stumbled across it, just didn't get the chance to finish reading it through. Do you know who posted it?
Last edited by SuperC1; 06-12-2007 at 05:12 PM.
06-12-2007, 05:12 PM
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I was looking through some idle searches when I saw somebody hijacked the thread and jumped in and said you can lower your fuel flow by reducing timing and some other factors at idle, but I can't find it anymore. It was an unrelated topic so it doesn't pull up when you search for it. It had something to do with idle and surging. But I skipped it somehow. Just wanted to finish checking it out. It may have been on another board.
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06-12-2007, 09:00 PM
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You can tune for OL @ idle using PE mode and then run it lean. This is mostly used for larger cams with lots of overlap, which render your NBO2s pretty much useless. Is this the article you were talking about?
http://www.hptuners.com/forum/showthread.php?t=5585
http://www.hptuners.com/forum/showthread.php?t=5585