MEFI Burn Tuning for idle.
09-04-2015, 01:58 PM
#32
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I have the map adjusted to give it quite a bit more fuel in the higher KPA when it does drop into gear, and you are correct that the MEFI does have a PID loop control for timing to stabilize the idle.
This weekend, I will get some screen shots of my maps, and I will take a quick datalog to see what more is going on. Currently in gear, my AFR is around 13:1 or so, and out of gear, about 15:1.
09-04-2015, 01:59 PM
#33
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Yes, it is a stepper and not a valve, and the counts are below 10.
09-04-2015, 05:49 PM
#34
If you are using MEFI Burn, the software has the ability to data log and play back. Have you done this to see if you can confirm the cell jump or is the MEFI 1 update rate too slow?
Also, as SB stated, the MPI Mag intake will give up the ghost in the mid-5000 rpm range, so your cam may not ultimately be a good match for it... assuming you can get this Idle issue worked out.
Also, as SB stated, the MPI Mag intake will give up the ghost in the mid-5000 rpm range, so your cam may not ultimately be a good match for it... assuming you can get this Idle issue worked out.
09-04-2015, 05:51 PM
#35
Go to page 11 it looks like you may be able to rewrite from mefi 1 to 2 which i presume does have timing table's. It depends on which module you have...hmm i believe 2 has timing table's
https://www.mdmotors.ru/netcat_files...MPI__alb_3.pdf
https://www.mdmotors.ru/netcat_files...MPI__alb_3.pdf
09-04-2015, 05:54 PM
#36
I am going to work on it more this weekend. If I can get a fully loaded 38 Powerquest to go 75mph with 502 MPI motors, that has 3/4 tank of fuel, full fresh water, waste water, gen, ac, hot water, standard bravos, I think the cams are just about perfect, and I haven't even gave it more timing up top yet, just running 87 octane. I want to soon log my MAP and see how bad even my throttle body and factory air filters are holding me up. This or that, its not about it being a too big of a cam, its about getting the thing to idle right using a MEFI, lets all learn from that instead
I have the map adjusted to give it quite a bit more fuel in the higher KPA when it does drop into gear, and you are correct that the MEFI does have a PID loop control for timing to stabilize the idle.
This weekend, I will get some screen shots of my maps, and I will take a quick datalog to see what more is going on. Currently in gear, my AFR is around 13:1 or so, and out of gear, about 15:1.
I have the map adjusted to give it quite a bit more fuel in the higher KPA when it does drop into gear, and you are correct that the MEFI does have a PID loop control for timing to stabilize the idle.
This weekend, I will get some screen shots of my maps, and I will take a quick datalog to see what more is going on. Currently in gear, my AFR is around 13:1 or so, and out of gear, about 15:1.
09-04-2015, 09:26 PM
#37
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Then why not advance the start up say 18/23 degress and be done with it...... need to add a small a small slurp so be it. I have had a bit to much wine right now but but you guy;s who split hair's should know OS senors simply trim arfs nothing to do with real world apps.
Someone care to spell out the the real world overlap at .050. Good call Trash on timing tables honesty clears the converstaion
Someone care to spell out the the real world overlap at .050. Good call Trash on timing tables honesty clears the converstaion
Last edited by Pliant; 09-04-2015 at 09:35 PM.
09-04-2015, 10:38 PM
#38
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As a comparison, the HP500 cam has 6° overlap at .050" duration figures
Last edited by SB; 09-04-2015 at 10:47 PM.
09-05-2015, 12:19 PM
#39
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244,[email protected], 114 LSA.
244+254=498
498/4 = 124.5
124.5-114=10.5
10.5x2 =21 degrees @ .050
IF that's correct 21 that is......Is this tbi or mpi your going to need a lot of fuel at idle..Id call Marine Kinetics it seem's to my limited knowledge you not only need to change igniton timing but injector timing and pulse rate...Maybe a kicker motor to get that boat going.....
