One big difference is that the factory EFI‘s using the reluctor where is the aftermarket does not. If you scroll back a page or two blue85 was talking about referencing that reflector when you first plug in a new computer would be something similar to how the aftermarket EFI makes you reference the timing.
Screenshot logs aren't always the best. And Mark is way older than I am, even if his statement is true.
With that said I like some TM. On my rig I use transmission torque management as well as abuse mode. Slamming reverse during a climb or limiting power during front and rear digs was something I wanted. You don't have that option but that's ok.
I'm glad to see the fuel pressure corrected. So when you pull the vacuum its right at spec correct?
I won't touch a tune where the vehicle has any fuel, air, or spark mechanical issue. You're just chasing your tail and there's a good possibility when it gets fixed you made shit worse.
Two more question: Firstly don't worry about Howell. Leave them alone for now. The whole cooler heads will prevail thing. Have you looked and found that was stock GM TM tables in that tune? This could be a clue.
Second: I didn't read much so I don't know this whole backstory. Per our PM, have you checked the injector part numbers that are in the engine. if so what are those?
Those are the first questions that need answered.
Add to that injector opening and closing times
I used to think I was pretty tech saavy, but after reading through all of this I'm not so sure anymore.
At what psi ?
The first problem is that there are no timing marks. Basically, the reluctor wheel is attached in a specific orientation to the crank and the sensor is in a known location, so the crank position is known exactly. The CASE learn is a fine-tune kind of thing looking at the small errors coming from that specific assembly. Even my old 3800s had no timing marks, just teeth attached to the harmonic balancer.
You can't use an 8.1L base file without electronic throttle control. Apparently, that is part of the 8.1L segment you would need to swap in. As for running a compare between the two files and looking at all of the normal settings...that would be value-added and is some of what we've been doing in this thread.
They are the same.
LS numbers usually reference 4 bar (58psi). They used to mostly be rated at 3 bar, which is probably what you mean (43.5psi), in which case we're both talking about the same size injector.
