tuning question

Enigma

Enigma

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Feb 8, 2008
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Maybe more of a clarification or discussion, in fact I don't know if anyone is even messing with these tables. B0926, 0927 & 0928 state that this is the number of degrees to wait after the pilot to inject the main pulse. So the way I read to calculate that is take your base timing number (B0910 for instance) and add the number in B0928 to see where the pilot injection begins.

So when advancing the timing for power, fuel econo, etc. it advances the pilot correct? So the question is should we be changing this number to get the pilot closer to factory pilot injection location, or should the pilot be advanced a bit more due to a larger fuel charge which is usually associated with tuning. Or should this table just be left alone?

It seems to me that it would be calculated based upon what the General initially setup. I'm just curious if anyone changes any of these, if anyone sees any benefit from changing them based upon changes made to the tune.
 
Enigma

Enigma

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Feb 8, 2008
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Shameless bump...

does the lack of responses mean no one messes with these?
 
sweetdiesel

sweetdiesel

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Aug 6, 2006
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I adjust them:) I lower the numbers based off main timing

Do i notice a difference NO! for the most part pilot is shut off in my tunes so I dont really concern myself
 
2500HeavyDuty

2500HeavyDuty

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Feb 14, 2008
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Katy, Tx
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what i been interpreting from reading each table over an over again is that the timing tables tell when the pilot to inject fuel and the b0926-0928 tells when to inject the main injection.

haven't really played with the pilot injection, i leave it stock for now. i did notice when ym injectors were bad the injector rattle went away when pilot injection turned off at high rpms :D
 
mytmousemalibu

mytmousemalibu

Cut your ride, sissy!
Apr 12, 2008
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Ok thanks guys! Although i have had EFI for a bit now, i know very little about it. I might as well have just bought it:eek: Im just trying to piece togather in my head how these tables are working and how they affect each other, what to adjust. I have done some baby steps doing pats 20/20 tune and a couple of mods to it. I just wanna get a handle on it all! Thank god its an LB7, anymore and my head might pop:rofl: I really wanna get fimilure with where my timing is at. I dont have the truck to play with it all yet and once its back, twins are goin in soon after and i need to tune for them. So im trying to get a jump on it by lots of reading and foolin with it and askin Q's!!!

I'm gonna endup burnin up your phone about it sooner or later Dan-O :hug::rofl:
 
2500HeavyDuty

2500HeavyDuty

Book 'em, Danno!
Feb 14, 2008
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Katy, Tx
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mytmousemalibu said:
Ok thanks guys! Although i have had EFI for a bit now, i know very little about it. I might as well have just bought it:eek: Im just trying to piece togather in my head how these tables are working and how they affect each other, what to adjust. I have done some baby steps doing pats 20/20 tune and a couple of mods to it. I just wanna get a handle on it all! Thank god its an LB7, anymore and my head might pop:rofl: I really wanna get fimilure with where my timing is at. I dont have the truck to play with it all yet and once its back, twins are goin in soon after and i need to tune for them. So im trying to get a jump on it by lots of reading and foolin with it and askin Q's!!!

I'm gonna endup burnin up your phone about it sooner or later Dan-O :hug::rofl:
Click to expand...

i got two cell phones, one of them with a battery life of 20 days so bring it :poop:


whenever i get my truck back together ima seriously mess withing timing alot see what i can out of it
 
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TrentNell

TrentNell

Finally underway !!!!!
Jul 7, 2008
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i have never found a need to change pilot timing because i am not changing pilot pulse . :D not to mention pilot is shut down @ WOT and anything above 2500 rpm
 
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Enigma

Enigma

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Feb 8, 2008
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Huntinducks82 said:
Can someone explain how "pilot injection" is different from regular injection. Or Timing Pilot compare to Timing Base.

Thanks
Click to expand...

Pilot injection is a small amount of fuel which is injected prior to the main injection event. Basically it's what makes the newer diesels quieter than the older generation diesels with only one injection event. The “pilot” injection reduces the pressure spike of the main injection, thereby reducing noise, pollutants and a host of other things I don't remember.

Timing pilot vs. timing base is the difference between when the “pilot” injection happens vs. when the “main” injection happens.
 
Huntinducks82

Huntinducks82

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Enigma said:
Pilot injection is a small amount of fuel which is injected prior to the main injection event. Basically it's what makes the newer diesels quieter than the older generation diesels with only one injection event. The “pilot” injection reduces the pressure spike of the main injection, thereby reducing noise, pollutants and a host of other things I don't remember.

Timing pilot vs. timing base is the difference between when the “pilot” injection happens vs. when the “main” injection happens.
Click to expand...

Thank you.
 
Enigma

Enigma

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Feb 8, 2008
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I think the jury is still out on any long term issues zero pilot may cause. Naturally you'd tend to think if the engine can endure 2500+ rpm with zero pilot it would also endure 600+ rpm without it. I think the reason there's little data on this is at low RPM pilot injection is actually beneficial as it helps to cause a more complete burn, which means double reasons to leave it alone down low.

Granted that's data I've read, as I've personally never run on a dyno to test if pilot injection helped or hurt my HP @ 800(ish) RPM :D
 
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