How to tune lowest load row in VE Table?
#1
How to tune lowest load row in VE Table?
Gents,
MLV wants me to put in a **** ton of fuel in the 20 kPa row, 25% more in places than in the 30 kPa row when I analyze a track log. However, when I scroll through the log, those settings produce ridiculously low AFRs. What's the general rule of thumb for tuning that lowest row for the track?
Thanks,
MLV wants me to put in a **** ton of fuel in the 20 kPa row, 25% more in places than in the 30 kPa row when I analyze a track log. However, when I scroll through the log, those settings produce ridiculously low AFRs. What's the general rule of thumb for tuning that lowest row for the track?
Thanks,
#2
are you talking about the bottom most decel row? If so, that can be leaned out as it's vacuum. I go 15-16:1 on my car for daily driving however i've read of some people going as lean as 18:1.
You can also activate over run fuel cut. As the name implies this cuts all fuel on decel/vacuum and essentially turns the injectors off.
I'm sure the pro's will chime in with much better answer than I.
You can also activate over run fuel cut. As the name implies this cuts all fuel on decel/vacuum and essentially turns the injectors off.
I'm sure the pro's will chime in with much better answer than I.
#3
I'm still a total noob when it comes to tuning, but I found I would get some bucking transitioning back to throttle from decel on the track, and adding fuel in those low kPa cells smoothed things out.
I would pay more attention to the behavior on the track than the absolute numbers, as long as they're not ridiculous.
I would pay more attention to the behavior on the track than the absolute numbers, as long as they're not ridiculous.
#4
Problem is, they are ridiculous. I had guy one tell me I was shooting flames out the exhaust on downshifts. No one ever said that before, but I see it a lot on other cars. Good thing the cat is gutted.
I do have ORFC active, but the transition during shifts is not long enough to have it come on.
I have 14.7 in the bottom row now, but I was seeing 9s when reviewing the log and I was still way short of what MLV wanted. For example, for the 4800 rpm, 20 kPa box, it wanted 125. I put in 100 as an experiment--I think I had 80 in there before--and still saw really low AFRs between shifts.
I assume then, there's no actual reason MLV is suggesting these numbers and I should go back to something a little lower than the 30 kPa box above for each?
Thanks,
I do have ORFC active, but the transition during shifts is not long enough to have it come on.
I have 14.7 in the bottom row now, but I was seeing 9s when reviewing the log and I was still way short of what MLV wanted. For example, for the 4800 rpm, 20 kPa box, it wanted 125. I put in 100 as an experiment--I think I had 80 in there before--and still saw really low AFRs between shifts.
I assume then, there's no actual reason MLV is suggesting these numbers and I should go back to something a little lower than the 30 kPa box above for each?
Thanks,
#7
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You can pull tons of fuel out of there. In the same way that the car doesnt have trouble getting going again after over run fuel cut, it wont have any trouble going from a tiny bit of fuel in super high vacuum back into cruise or higher load cells.
#12
You also want to watch higher rpm, low load cells. Those +4000rpm cells below 100kpa always want to lean out really bad for me, as a result of data collected between shifts I believe. If I let MLV do what it wants when I do end up cruising pretty quick on the highway it'll be super lean.