Felt like finally installing my new boost control solenoid. It has been sitting in a box since last year or something. No real reason to do so. Results: it drives nice. This feels like it added some refinement to the boost situation. I'll have to drive it in more conditions to see if that occasional jerkiness at partial boost is gone. Took all of 20 minutes.kevm14 wrote: ↑Mon Jun 17, 2024 9:47 am There are more things I can do with Xentry as well.
Two key things:
- Graph/display cam timing commanded vs actual and see if anything undesired is occurring. I haven't done this. Hopefully I don't need HP Tuners to do this in a manner that I need. And even if I do, I am not sure I know what "good" vs "bad" is.
- Graph/display boost pressure control duty cycle - apparently there are ranges that it expects although if mine were falling out of range I'd probably have a CEL for it.
What I will do is throw the vacuum pipe at it and see what changes. Then I will try a new boost control solenoid. Then I will graph some things and go in the direction of the cam timing and see if maybe after all this I still need thicker oil. I just want to narrow this down.
It seems to drive most consistently when oil temps are in the 120F range.
I do need to narrow this down to either cam timing control issues or boost control issues. Cam timing issues are not to be trifled with. Left long enough this can actually trash the entire cam and possibly the head. The fix would be to replace the adjusters with new if it is having difficulty controlling cam timing in all conditions. Or try thicker oil if I have some evidence that this is actually occurring.
Boost control issues of this type aren't really a problem at all - just annoying. On the other hand, if it is slamming the waste gates around that's no good for anything. I want it to be right because when it drives right it's very enjoyable. Smooth, effortless torque. And pretty good throttle response. I think if I can get to that across all conditions I will finally be satisfied with this powertrain.
14 E63S: chasing lower rpm surging
Re: 14 E63S: chasing lower rpm surging
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