VS L67 A2A closed/open loop problems

[delcowizzid]

turn the temp for closed loop right up so it never turns on and do the whole thing open loop and wideband both banks to make sure neither are lean then you can just use that one a/f ratio table like you have been.stop trying to get closed loop idle before the car has stopped moving or it will want to stall.

[VX L67 Getrag]

Seems a bit extreme to go full open loop fuel, just seems weird why it won't enable the flag!

I'm not trying to get closed loop IAC while moving, if you have a look at the logs which you must have the closed loop IAC isn't active at the end of them while it's stationary, trying to figure out why it's not active there!

[delcowizzid]

with the split stft its gonna have to be open loop or your gonna need to fix the issue everything you are doing is a bandaid to the problem not fixing the cause.iu wouldnt be surprised if the massive split trims is why the closed loop flag wont set properly pcm is having a hard time working out whats going on.bit like sitting there with the wife saying she wants to do something together but saying its ok for you to go fishing you know its not really ok to go fishing LOL

[delcowizzid]

its set for 7-10 seconds to get to idle a/f ratio and the idle grams a second airflow while moving is set to 0 for the lower speeds where it stalls may not help youre telling it dont flow any air when rolling from 0-38kmh

[VX L67 Getrag]

Yeah there all valid points, it's just a lot of tuning to make sure the whole inj mul tables right are if I switch to full open loop as I know I have the idle & full load areas's right but everything in between I have done a fair bit of road tuning with wideband correction but there was so many variances with air flow differences & temp corrections etc.

do you mind showing where the airflow 0-38kmh & the timer for A/f is?

[delcowizzid]

scroll down to airflow learning in the tables you will go past the timer v/s temp on your way down LOL

[VL400]

The right hand O2 seems to behave very differently to the left. It rarely gets any cross counts, and the INT works really hard to try and lean it off. Swap the O2s around and see if the laziness follows? The VS has an earth problem for the sensor heaters that can cause weird things too.

The target idle RPMs are prob not helping closed loop idle speed control. The proportional spark (if thats what it is still called) looks to be working overtime to try and bring up the RPM, the IAC steps go really high. Look at 3min10 of the closed loop still inactive xdl. I setup a new byte item that shows when closed loop idle is active so it can be displayed on the monitor screen, c/l idle speed starts at 3min16. To get to the target of 1050RPM it commands 120 steps, prior to that it had 0 steps and 900odd RPM in open loop speed control.

Closed loop.png (91.37 KiB) Viewed 3785 times

3min39 is another example, closed loop fuel pulls out heaps, idle speed drops, IAC and spark ramps up way too high, closed loop fuel then tries to fix its error and after a few more seconds idle speed control drops out.

Closed loop 2.png (140.08 KiB) Viewed 3785 times

Go back to basics as delcowizzid suggested. Get one part working, then move on to the next. You will be chasing your tail with closed loop fuel enabled trying to get the idle working.

[VX L67 Getrag]

Thanks for looking, I have done the wiring mod for earth (from memory it was D15 joined to D16 & joined to A2 & then all to another good earth.

I have tried swapping the sensors & new sensors with same result, maybe because the split blm's I should just disable 2nd o2 & run directly off the driver's side.

I'm also concerned about the way i have the bin setup for making sure flags & timers are enabled correct, I will adjust the timer for A/f(not sure which 1 your referring to here as theres a few for in p/n & drive other multipliers too but none direct?) & 0-38kmh(@3d9E-4DA6) DW mentioned but in the latest bin I posted that would be best to have the closed loop idle flag to enable & with ff the closed loop to open loop?

[0081(2)]

Hey VX L67 Getrag,

I have been thinking about the issue you are having and intercooler piping lately and was wondering if its was possible to drop down a pipe size from 2.5" pipe on the intercooler outlet side to say 2.25" pipe?? this would decrease the volume of pipe and possible help a little with the issue you are having. I know its not a big difference but wouild still be good to know.

Or is 2.5" where it needs to be?? i have not really been able to find a calculator for intercooler piping online.