This has got me stumped. I dialed in my VE table within 1-2% then dialed in my MAF within 1-2% of dynamic airflow, but my fuel trims are going lean in the upper rpm-map range. This is with PE and DFCO disabled. Any suggestions?

I uploaded my tune, log, and a picture for the efilive guys.

I already took care of the burst knock before anyone says anything

Thanks

 

How did you disable PE? Sorry I have EFI Live so I can't see your tune... The reason I ask is because fuel trims usually don't work in the upper rpm and Map ranges, they freeze and stay the same as your last pre-PE enable trim... But you could probably get them to work if you disabled them a certain way, however going up to 90kpa+ and 6000 rpm @ 14.63 is not really a good idea....

 

set the PE enable pressure to 640kpa.

 

So you are in closed loop and don't have PE coming on? COmmanding 14.7 at 4500 rpm @ 98kpa? Doesn't sound like a smart plan. You know, you can command what you want in the PE and use PE and still correct the VE. Or at least command 13.5 all the time in the open loop table and stay open loop while you clean this up.

But anyway, if you are over 4000 rpm the error is in your maf. If you are under 4000 rpm the error is in between the two. BUT you are in closed loop not letting it go into PE. I am not sure what happens, you just end up with a commanded 14.7 I guess. WOW

Your VE looks flat to me as well. Flat meaning not much from the low airflow areas to the areas that are lean. Again, telling me the ve needs some more juice in those areas. Or at the least the MAF.



Your VE values look awful high as well.

 

I see that now (I got HPTuners installed!!!).... Now onto your log... I am assuming that you don't have a wideband and that is why your tuning with fuel trims, correct? Tuning with fuel trims can work just fine, in lower rpms and map ranges, however since you have to disable PE to do it, your commanding 14.63 at all rpms.... I noticed several times you at WOT @ 6000rpm and commanding 14.63....


Another problem you might have is inaccurate readings from your log.... I noticed you pulsed the throttle in a few sections in the upper rpm and Map ranges... When VE and MAF tuning you do not want to do this.... You want to make throttle change really gradual sudden throttle changes will screw up your loggs, I usualy filter out throttle changes that vary 10% over a 100ms (I think that was the time frame)... See what I mean look at this section of your log...



Also as mentioned before, going WOT at 14.63 is probably an accident waiting to happen...

 

Thanks a bunch fellas! Im still pretty new at this, and your right about 14.63 not being too safe under heavier loads. I made a mistake and didnt go with the pro version and a wideband right off the bat, but I should have my wideband shortly so that should definately make this safer and easier.

Would turning PE mode back on and waiting on the wideband to do upper load tuning be the best bet?

Thanks again

 

Yep, that is what I would do, also you can kinda use your 02 sensors, just try and keep them in the ~890 range... You will love how easy it is once you get the wideband!

 

I know you said you have efilive, but do you know how accurate a wideband would be using the erg input on hptuners (0-1v) as opposed to the pro version with a 0-5v input? Its $250 to upgrade to the pro version. Im really kicking myself for not doing it to start off with, in which case it would only be $150.

 

I have HPtuners now too !! Well as far as accuracy with the egr input, you can get it pretty close IMO... However the standard Histograms that use AFR will have to be recreated/adjusted to use your wideband. Mainly what you will need to do is create a custom PID with the output of the egr signal (your wideband), and use that value in the wideband AFR calculation... Make sure you get one with a gauge, that way you can monitor you Wideband AFR threw it and adjust your AFR equation to match. What wideband are you looking at buying?

 

I want hptuner too dammit. And wait to get a wideband it is so much easier.