07.5 4X CC 2500HD, EFI Live, MBRP exhaust
new updated website!
07.5 4X CC 2500HD, EFI Live, MBRP exhaust
new updated website!
my changes didn't work. I know it's pilot #1 that won't go dead, and I followed it through every table related to it with the scan on, so I know what cells it's using as they're highlighted. I zeroed every single one and it still stays lit at 3.5 mm3 and 150US. If Ross can find a table related to the fuel pressure max pulses that limits timing severely when set to 1 pulse max then that'll be the next and hopefully final step in my tuning. Otherwise, the truck is running great, nothing to complain about. I just know it'll go even faster if I can get this darned pilot off......................
Jody
07.5 4X CC 2500HD, EFI Live, MBRP exhaust
new updated website!
Mine too
Thanks for all your posts in here outlining the problem though.
well, I'm still happy. I've tweaked Robs tune to get it where it's getting the timing and boost he wanted and the truck is now real strong up top, stronger by a full half second over my 12.70 tune from 80 to 105 mph.............
There's nothing wrong with Robs tune, just that my LMM won't reach the numbers he's commanding, so I had to tweak things until they did. That's why it's important to datalog things to really know where you are. I thought the truck felt good from the get-go, but after the ongoing tweaks and many many datalogs it's finally reaching the timing and fuel it should, and there's a huge difference in how it runs now compared to where I started.
07.5 4X CC 2500HD, EFI Live, MBRP exhaust
new updated website!
I just did some logging and have a question. I noticed pilot #2 is off in my tune and there is a table b0990 that is adjustment to main inj. timing with pilot 2 off. The values in the table are in the 2-3.5 degree range for the most part.
I logged with both maintsel_m and pilot2T_M and pilot2q_m, so it's off for sure.
Is it coincidence that this 2-3 degrees is the amount of timing were getting robbed of even with pilot 1 on? I haven't tested anything yet.
The pilot 1 is still on in the tune I'm running right now since Jody said the changes didn't help.
Pilot 1 is always on for me other than if I limit total pulses to 1 in the fuel pressure tables; but then you lose a ton of timing 10-12 degrees or more sometimes.
I now see pretty much the timing I request as long as Pilot 1 is on, but I've zeroed out #1 pilot at wot areas and 180-190 mpa fuel pressure areas. You'll know if you have it right as the pulse will drop from 240US to 150 US at 100% tp. What is yours showing? The confusing thing about that pilot is that according to the table it should not even be working at wot, the pulse table only goes to 30 mm3, and I'm seeing 110 mm3 at wot. But the scan shows it active and operating in the 3.5 mm3 tables.
07.5 4X CC 2500HD, EFI Live, MBRP exhaust
new updated website!
Maybe I need some better logs with this tune. I can't go WOT for very long around here. I looked at a log of an older tune at the track with the pilot on and it was within .5 deg of commanded timing.
But anyway, what does B0990 do?
Example....
At 3450 rpm 108mm3 my timing is 2.1degrees shy of what is commanded in a log I just did today. The value right there in b0990 is 2.0 degrees
Also my pilot 1 shows 150uS
The one with the timing where it should be was 240uS.
Last edited by OSUBeaver; April 18th, 2009 at 10:53 AM.
I don't have that table on my LMM. It's probably a coolant temp modifier to the timing table with pulse 2 only active. Most of the multiplier tables are zeroed out when warmed up, so they don't affect timing. Should be two tables, one with degrees per rpm and mm3, and then a multiplier table that takes that degree and multiplies it by a factor to determine how much more timing to add at that rpm and mm3.
Jody
07.5 4X CC 2500HD, EFI Live, MBRP exhaust
new updated website!