Quote:
Originally Posted by laynlo15
Geez, you are going deep into this tuning. Great job
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Not much further than I've tried in the past, but yeah. After all the help you, and the many others have given me, I felt like I owed trying to complete this little journey, out of respect, in my own weird way. And that brings me to a, pretty much, final thought on this endeavor:
For my combination, I am now pretty certain I have reached the end of the road, as far as I can tell, and within the bounds of my experience and understanding. I know it could be perfected by a few guys here, but they've helped a lot already, and I'm not made of money.
So - my tentative conclusion: I don't have enough cam (lobe, specifically) to use this method with my combination. The person I found this method from told me he didn't have limitations I'm finding, and I think it's because I don't have a cam, like most people probably do before adding a 2650, like I have (which I already covered why). I'm not making big power, but it must be beyond the limits of the fuel system, even with the DSX low-side I added. I have to stay with OEM for the entire long block, so if he's right, I think my conclusion is sound.
I was hoping to test, this last drive, in the low 50s, but my phone lied, and I was late, and drove in the bottom 60s. Commanding a maximum of 22MPa, and raising the middle of the BASE DESIRED RAIL PRESSURE zone to a few MPa higher than stock, I still had pressure issues if I was pedaling (which was not why I'm coming to this conclusion - just trying to state I could not find a good compensation for that, confirming earlier posts why I was having this issue). BUT - my IPW was still just below 5.0ms the whole WOT hit (from 2000-6500 RPMs), and probably because I was commanding 22MPa of RAIL PRESSURE. The problem, and what is driving me to conclude my testing, is my SOI/EOI. Even though I took advice, and commanded 370* in the base SOI table (and zero'd ALCOHOL ADDER), I was still showing +375* and my EOI was dropping from a comfortable +200* to 190. With these injector events occurring too close to when they can't/shouldn't, and it not even being as cold as I'd want to try to go (not that I would really even try WOT at 50*s anyways) and fueling demand not being reached in this drive also - I'm feeling better about running these tests to their conclusion, and that is now. I thought my last chance at saving this method was with injection timing, knowing there wasn't much to be gained with OEM stuff, like I have, but I've stretched timing as wide as it seems reasonable. I can't find anymore to change to overcome all of this, so I think, officially, this is it. Maybe a combination with, at least, a cam lobe might work, but not a stock long block.
This is all fine. I have no regrets, and has been a big learning experience. I know I have the old fueling method to fall back on, and will be.
To be clear: the TOOHIGHPSI system has been GREAT!!! I'd buy it all over again, and I know the controller isn't the most feature packed unit on the market, but pretty much fills what I would want. It would be nice to add separate PE settings for different alcohol percentages (like the E92 has), but that's minor. I have nothing but positive statements to make about it, and for THPSI and Mike, also. I've gotten LOTS of help from he and his team, and I'm equally grateful to them, and to everyone in these posts that have shared. And, again - Thank You to the biggest contributors (in no particular order): King', Josh', Megahurtz, laynlo', airtroop, and I'm sorry to anyone I'm forgeting. Thanks to all who've shared anything in my effort. If I find anything else, I'll share, but this is the end of this road, for now.