Questions about fuel tuning
Questions about fuel tuning
EDIT: FUEL PUMP WAS GOING BAD, NOW IT'S SOLVED!
Ok after countless hours of reading on the forums, long runs and many adjustements in my fueling map, I came close to a final map. The car seems to like it a lot: I have absolutely no knock, spool is quick and top end is much better than before.
This is on an Evo VIII 10.5 turbo, with O2 eliminator DP, HFC, COP, Intake, LICP+UICP.
[B]
My car seems to give less knock, and better top end with 11.5-6 up top instead of 11.2 like many tuners use.
Here is the Maptrace:
BTW I'm working at leaning it a bit after 6000RPM to compensate for loss of VE.
Here is what I need clarification with:
I'm also working at leaning the cells in the 140 to 180 load area that falls under 12.0:1. I found while tuning that if I lean it at spool (140-160-180) , it comes up leaner all the way to redline even if I don't touch 200 to 260 cells. So for improving spool I need to lean the spool cells and add fuel in the full boost cells. I have some difficulty understanding what is happening into the engine for that to happen... My thinking is that there is fluctuation/difference of pressure between fuel line pressure and combustion chamber pressure making the injector flow vary according to what happened before in the combustion chamber... So my stock fuel pump is near his limits.
Thanks for your experiences on this one guys!
Ok after countless hours of reading on the forums, long runs and many adjustements in my fueling map, I came close to a final map. The car seems to like it a lot: I have absolutely no knock, spool is quick and top end is much better than before.
This is on an Evo VIII 10.5 turbo, with O2 eliminator DP, HFC, COP, Intake, LICP+UICP.
[B]
My car seems to give less knock, and better top end with 11.5-6 up top instead of 11.2 like many tuners use.
Here is the Maptrace:
BTW I'm working at leaning it a bit after 6000RPM to compensate for loss of VE.
Here is what I need clarification with:
I'm also working at leaning the cells in the 140 to 180 load area that falls under 12.0:1. I found while tuning that if I lean it at spool (140-160-180) , it comes up leaner all the way to redline even if I don't touch 200 to 260 cells. So for improving spool I need to lean the spool cells and add fuel in the full boost cells. I have some difficulty understanding what is happening into the engine for that to happen... My thinking is that there is fluctuation/difference of pressure between fuel line pressure and combustion chamber pressure making the injector flow vary according to what happened before in the combustion chamber... So my stock fuel pump is near his limits.
Thanks for your experiences on this one guys!
Last edited by domyz; Nov 26, 2012 at 07:10 AM.
lean spool might actually help in this case. adjust it so that it doesnt have as much as an effect as in stock form and you should get leaner spoolup without having to change the values in the spool area of the fuel map.
This is a very good idea, i'll try it and give feedback soon.
Thanks!
