I would do the slopes also if you have a good MAF curve.
I ended up increasing base pressure to 50 psi. Gave the car a quick start up and idle for 1 min. No datalog but it started up fine and idled OK with AF being around 1 lambda at idle. I just finished up ramping up the injector high slope, low slope, breakpoint, and compensation for battery voltage by 10% to match the 10% increase in base pressure. I also changed desired pressure drop across injectors from 39 to 46 psi per Don Lasota's book. Flashed to the car and ready for a startup in the morning.I would do the slopes also if you have a good MAF curve.
Did some driving / datalogging and the increase in fuel pressure definitely brought injector duty cycle down. Tonight I'll add the 2lb lower and increase base pressure to 55psi. That should give me some headroom with my combo and I will works towards dialing in this as my final combo.
Thanks! After I get af dialed in I need to populate the failed maf table. I have a part throttle tip in stumble. I really hope enabling the failed maf table fixes it.Nice! Sounds like you are very close now.....excellent job progressing thru this project.
I've found that makes a decent difference in driveability. Using the histogram makes it a snap to do as well.Thanks! After I get af dialed in I need to populate the failed maf table. I have a part throttle tip in stumble. I really hope enabling the failed maf table fixes it.
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I'm not sure how to use the histogram but I guess I could figure it outI've found that makes a decent difference in driveability. Using the histogram makes it a snap to do as well.
I'm not sure how to use the histogram but I guess I could figure it out
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Thank you for this. I'll watch it tonight.
Crazy I know. Probably gonna take the 2lb lower off lol.Lmfaooo 27-28?! I may want to rethink my 3.5"/4# lower.
I'm going to fire up the car and log the frps and adjust the regulator down to see if the reading in SCT live wire changes. I'm thinking that's probably the most accurate way to set the fuel pressure.My thought is that regardless of the actual pressure, it's what the ECU thinks the pressure is that matters, because that's what it responds to in setting the injector duty cycle. The value in the PID is what matters.
When I dataloged the frps is was saying 57ish psi at idle. Turned the regulator down until it was showing me a average of 55.2 to 55.4. I think I'm dialed in now. Looks like that is the best way to set it. Using a mechanical gauge gets you in the ballpark but obviously it was off a bit.My thought is that regardless of the actual pressure, it's what the ECU thinks the pressure is that matters, because that's what it responds to in setting the injector duty cycle. The value in the PID is what matters.