Joined
·
650 Posts
Background: Car has catted Kook's headers and a cone filter, and was tuned for a cam by a remote tuner using EFILive scans. The cam at that time was a 226/230 600/600 112 +3. Recently, I discovered that I will need to have the ability to idle smoothly on the Stock factory tune in order to continue driving the car in California.
Therefore, the car now has a 223/230 615/607 115 +2 to get less overlap.
On the old custom tune under heavy acceleration I got some pretty bad detonation in the 3000-4500 RPM, which surprised me a bit because those cams aren't THAT different. So I thought hey, since I want to run on the stock tune anyway, maybe I can load the stock tune and make some tweaks to it for the cam based on the changes the tuner made for the other cam. Then I learned about how EFI live licenses work and that I couldn't do that without spending a bunch more (and then looked into HPTuners which sounds like it might be the best option in the long term). So in the short term, I still have my old SLP Predator, so I tried using that to tweak some fuel and spark values based on what I knew from the stock and custom tune. Went for a drive and everything seemed okay, only the power between 6500-7000 RPM dropped off significantly more than I expected, and then I got a P0068 and went into limp mode. After clearing the code everything was fine. My first though was that the MAF was reading too high because the cam was giving it more air than it expected, however after looking at the log, the air flow was reading barely over 200. After looking at logs from this car going above 300 g/s with the other cam both with the custom tune as well as the "SLP 455 Bobcat Tune", and my truck reaching 280-290 with a smaller cam, something seems off to me. I recalled seeing a ton of motor oil that had backed up into my intake tube and throttle body at a track day, and then inspected my MAF and it looks like I can see some residual motor oil on it. I sprayed it down with MAF cleaner, took some more logs (a little bit conservative on the rev limit), and that only improved it a bit to the 230 range which still seems low to me.
So... is that P0068 just because I exceeded the stock rev limit with a mildly tweaked stock tune, or is there something deeper that I'm missing here? And is that low MAF reading likely related?
My next attempt will likely be to take SLP's 455 bobcat tune and pull a bit of timing and PE AFR from the high rpm stuff because both of those look a little too high to me, and then add some low RPM timing because of the cam.
Thanks in advance. I already reached out to the tuner for a retune but haven't heard anything... and he also changed his policy that used to include retunes and now only does retunes within one year. The cost of another tune would likely be roughly what it would take me to grab an HPVI2, so not interested in another one-off if he won't tweak it as included with my purchase a couple years back.
Therefore, the car now has a 223/230 615/607 115 +2 to get less overlap.
On the old custom tune under heavy acceleration I got some pretty bad detonation in the 3000-4500 RPM, which surprised me a bit because those cams aren't THAT different. So I thought hey, since I want to run on the stock tune anyway, maybe I can load the stock tune and make some tweaks to it for the cam based on the changes the tuner made for the other cam. Then I learned about how EFI live licenses work and that I couldn't do that without spending a bunch more (and then looked into HPTuners which sounds like it might be the best option in the long term). So in the short term, I still have my old SLP Predator, so I tried using that to tweak some fuel and spark values based on what I knew from the stock and custom tune. Went for a drive and everything seemed okay, only the power between 6500-7000 RPM dropped off significantly more than I expected, and then I got a P0068 and went into limp mode. After clearing the code everything was fine. My first though was that the MAF was reading too high because the cam was giving it more air than it expected, however after looking at the log, the air flow was reading barely over 200. After looking at logs from this car going above 300 g/s with the other cam both with the custom tune as well as the "SLP 455 Bobcat Tune", and my truck reaching 280-290 with a smaller cam, something seems off to me. I recalled seeing a ton of motor oil that had backed up into my intake tube and throttle body at a track day, and then inspected my MAF and it looks like I can see some residual motor oil on it. I sprayed it down with MAF cleaner, took some more logs (a little bit conservative on the rev limit), and that only improved it a bit to the 230 range which still seems low to me.
So... is that P0068 just because I exceeded the stock rev limit with a mildly tweaked stock tune, or is there something deeper that I'm missing here? And is that low MAF reading likely related?
My next attempt will likely be to take SLP's 455 bobcat tune and pull a bit of timing and PE AFR from the high rpm stuff because both of those look a little too high to me, and then add some low RPM timing because of the cam.
Thanks in advance. I already reached out to the tuner for a retune but haven't heard anything... and he also changed his policy that used to include retunes and now only does retunes within one year. The cost of another tune would likely be roughly what it would take me to grab an HPVI2, so not interested in another one-off if he won't tweak it as included with my purchase a couple years back.
