Adding mods w/ no tune... watching A/F on dyno, but curious about timing advance
02-21-2010, 03:32 PM
#1
Safety Car
Thread Starter
Adding mods w/ no tune... watching A/F on dyno, but curious about timing advance
I've added a Halltech intake and ported stock intake manifold to my LS3 and plan to add C6Z manifolds/cats/3" x-pipe to my stock mufflers.
It's easy to see the change in A/F on the dyno as I add the mods, but I can't tell what's happening w/ the timing. Is there anything I need to worry about? I'd assume the stock timing is low enough that I wouldn't need to turn it down lower w/ mods, but just wanted to check.
As far as the reason for no tune, the car only has 900 miles on it and I'd like to get through a few thousand more miles and maybe year of ownership before I tune it incase a manufacture defect appears that could be blamed on a tune.
It's easy to see the change in A/F on the dyno as I add the mods, but I can't tell what's happening w/ the timing. Is there anything I need to worry about? I'd assume the stock timing is low enough that I wouldn't need to turn it down lower w/ mods, but just wanted to check.
As far as the reason for no tune, the car only has 900 miles on it and I'd like to get through a few thousand more miles and maybe year of ownership before I tune it incase a manufacture defect appears that could be blamed on a tune.
02-21-2010, 06:21 PM
#2
Safety Car
I've added a Halltech intake and ported stock intake manifold to my LS3 and plan to add C6Z manifolds/cats/3" x-pipe to my stock mufflers.
It's easy to see the change in A/F on the dyno as I add the mods, but I can't tell what's happening w/ the timing. Is there anything I need to worry about? I'd assume the stock timing is low enough that I wouldn't need to turn it down lower w/ mods, but just wanted to check.
As far as the reason for no tune, the car only has 900 miles on it and I'd like to get through a few thousand more miles and maybe year of ownership before I tune it incase a manufacture defect appears that could be blamed on a tune.
It's easy to see the change in A/F on the dyno as I add the mods, but I can't tell what's happening w/ the timing. Is there anything I need to worry about? I'd assume the stock timing is low enough that I wouldn't need to turn it down lower w/ mods, but just wanted to check.
As far as the reason for no tune, the car only has 900 miles on it and I'd like to get through a few thousand more miles and maybe year of ownership before I tune it incase a manufacture defect appears that could be blamed on a tune.
Last edited by Mike's LS3; 02-21-2010 at 06:25 PM.
02-21-2010, 06:41 PM
#3
Safety Car
Thread Starter
02-21-2010, 07:09 PM
#4
Safety Car
The MAF sensor could detect a change in air flow and the ECM can compensate for that change. In a lean condition, the ECM could add fuel to compensate back to the factory setting. Therefore, I was just curious to what the A/F was at either cruise or WOT?
02-21-2010, 09:45 PM
#5
Safety Car
Thread Starter
Here's the dyno stock vs. w/ the mods showing the A/F
Unless there's something I'm missing, I'm pretty comfortable w/ the A/F.. more just curious about the timing advance since I can't see that or timing pull w/o a scan tool.
02-21-2010, 10:38 PM
#6
Safety Car
Do you mean the MAF sensor can detect a change in air flow and the ECM can adjust timing advance as well?
Here's the dyno stock vs. w/ the mods showing the A/F
Unless there's something I'm missing, I'm pretty comfortable w/ the A/F.. more just curious about the timing advance since I can't see that or timing pull w/o a scan tool.
Here's the dyno stock vs. w/ the mods showing the A/F
Unless there's something I'm missing, I'm pretty comfortable w/ the A/F.. more just curious about the timing advance since I can't see that or timing pull w/o a scan tool.
Last edited by Mike's LS3; 02-21-2010 at 10:42 PM.
02-22-2010, 09:49 AM
#7
Safety Car
Thread Starter
And the stock timing map is conservative enough that I'll never have too much timing advance as long as the A/F is in check will I?
I guess what prompted this was someone saying they had to take a degree or two out when they added a ported intake manifold... just wondering if I need to pay attention to timing in addition to A/F, or if I can just watch the A/F and assume that the stock timing is ok for the car.
I guess what prompted this was someone saying they had to take a degree or two out when they added a ported intake manifold... just wondering if I need to pay attention to timing in addition to A/F, or if I can just watch the A/F and assume that the stock timing is ok for the car.
02-22-2010, 11:28 PM
#8
Safety Car
And the stock timing map is conservative enough that I'll never have too much timing advance as long as the A/F is in check will I?
I guess what prompted this was someone saying they had to take a degree or two out when they added a ported intake manifold... just wondering if I need to pay attention to timing in addition to A/F, or if I can just watch the A/F and assume that the stock timing is ok for the car.
I guess what prompted this was someone saying they had to take a degree or two out when they added a ported intake manifold... just wondering if I need to pay attention to timing in addition to A/F, or if I can just watch the A/F and assume that the stock timing is ok for the car.
02-23-2010, 10:21 AM
#10
Safety Car
Thread Starter
A bolt on part could be removed if need be w/o having a gap in the recorded vehicle history like swapping an ECU would have. I also feel it would be less likely for my dealership to argue about an intake and ported stock intake than a tune. Seems the tune warranty voiding comes from higher up and can't really be looked over.
