developing a plan

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Re: developing a plan

Unread postby decipha » Fri May 22, 2020 1:22 am

for now its probably best you use the smaller fn035 as I need to finish the datalogging code for the newer gufx before I release it. Will make life much easier.
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Re: developing a plan

Unread postby canuck1 » Fri May 22, 2020 9:36 am

No problem. Do you have any idea whether I should alter my cranking PW in my current tune (posted above)? It starts fine cold and warm. Minimal cranking, With no need to touch throttle when starting. I’m just worried I might be dumping more fuel in than I should be for some reason.

Sean
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Re: developing a plan

Unread postby decipha » Fri May 22, 2020 3:34 pm

reduce it to the pont it wont start then creep up slowly til it does
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Re: developing a plan

Unread postby canuck1 » Tue May 26, 2020 2:32 pm

I am wondering about the IMAF analog gauge in TPRT dashboard. The redline is set at 800 AD counts. I've pegged the gauge before and don't know if this is something I need to worry about or If can alter the scale on the gauge?

See attached picture.

Related question. How do I know whether to adjust high slope or not based on the Lambse-Lambda showing in the picture? It looks like the WOT multiplier commanded Lambse. Should I turn this multiplier off when dialing in injectors?

Sean
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Re: developing a plan

Unread postby decipha » Tue May 26, 2020 6:31 pm

not sure i follow but it doesnt matter theres an imaf digital gauge on the left side for an exact imaf count value which is what i use
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Re: developing a plan

Unread postby canuck1 » Tue May 26, 2020 8:59 pm

I guess I don’t understand if reaching the redline/limit of 800 AD counts on the imaf gauge means I need to be worried and should adjust something?

The default A9L2 setting for FN303 wot multiplier seems to be active. Should I disable it when dialing in injectors?

Sean
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Re: developing a plan

Unread postby canuck1 » Wed May 27, 2020 11:36 am

OK, nevermind the IMAF gauge question, I figured out where to edit the gauge values.

Can you help me figure out what to do with FN303? I can see Lambse dropping to .852 at WOT (which is what FN303 is commanding). At first, I thought I had overcorrected my attempt at making the high slope larger to remove the 9% or so I was rich. Now that I've realized the WOT multiplier is altering Lambse, I guess I'm wondering how FN303 effects the injector slope alterations required to get wideband to match Lambse? Is it still Lambse - WBo2 (Lambda) whether FN303 is in play or not? If so, it looks like I might be a couple percent or more too rich.

Sean
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Re: developing a plan

Unread postby PaulC-turbo5.0 » Wed May 27, 2020 12:29 pm

Surprised you like those analog gauges I am not a fan. I actually replaced an unused gauge with the fuel error to see that digitally. Pretty sure this stuff is just personal preference though.

Dont think you want to concern yourself with FN303, if you look .852 is only for 1500rpms and below, 1501 and above should be 1.00 aka not multiplying anything.

Is it coincidence that .852 is what your commanding in FN1362? If it is and your wideband is reading .85 at WOT then I am pretty sure your high slope is dialed in. Decipha congratulated you on having this part done a few posts back, take that shit and run lol. Just kidding man I know how easy it is to second guess every little thing when being new to this.
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Re: developing a plan

Unread postby canuck1 » Wed May 27, 2020 2:24 pm

Hi Paul, thanks for responding.

I don't really use the analog IMAF gauge, I was just concerned that it had pegged at 807 and was in to the redline on the gauge. I figured out the gauge's readout was configurable and I fixed it.

Yes, I did think I was done with high slope in terms of dialing in injectors but I've been logging a few other WOT 2nd gear pulls just to confirm everything is working as it should and I've seen the .852 Lambse value pop up at WOT near peak rpm. If I look at a log of low (1300 rpm) cruise, Lambse and WB02 are rolling together +/-, quick acceleration drops Lambse to .836 (car stumbles) then Lambse briefly stabilizes around .875 (as per my fuel table) until around 2600 rpm where it drops to .852 and remains there until peak rpm and I let off. I suspect the big drop off between 1300 and before 2600 has something to do with a wonky LOAD value that I've put in. I have no idea why it settles at .852 but I did notice that this matches what FN303 commands (given, at lower rpm). What I'm really more concerned about is whether or not I still need to correct my fuel error by adjusting high slope since Lambse is 2-5% LESS than WBo2 (Lambda) during these fluctuations. Do I adjust high slope to make them agree or do I ignore it since there may be a multiplier at work that I don't understand?

Sean
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Re: developing a plan

Unread postby canuck1 » Wed May 27, 2020 2:47 pm

A little more thorough breakdown of the last pull shows that every time I have a drop in Lambse below what I'd expect, Perload values greater than 1 are registered, which I presume points to the Load values I've input and another level of enrichment is taking place (it thinks I'm going into boost?). I will try better refining my Load values.

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Re: developing a plan

Unread postby blocmi » Wed May 27, 2020 2:57 pm

Without doing the math, I'm gonna guess the LAMBSE value of .852 is an interpolated value from the base fuel table because your perload is is high. Once you dial in FN035, LAMBSE should be what is commanded in the base fuel table at 1.00 perload, unless you've change it, I believe the value should be .875. Perload controls fuel.

As far as the LAMBSE not matching the WB... looks like your about 3% lean. You can either reduce your high slope by 3% to add more fuel, or increase MAF value in fn036 for 4.0v by to increase fuel 3%. I can't tell you which method is correct from screenshot, I have a hard enough time judging from a log. I don't think its uncommon to to swing back and forth when adjusting fuel, but the swings should get smaller as you near being dialed in.

Another thing to consider, I have found when doing WOT pulls, it takes awhile for my LAMBDA to stabilize. Make sure to hold it wide open for a few seconds and look for a steady LAMBDA, not just a single snapshot on a snap of the throttle.
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Re: developing a plan

Unread postby canuck1 » Wed May 27, 2020 3:35 pm

Thanks Mike,

I haven't altered the A9L2 base fuel table, so you're correct about what it should be referencing. I am pretty sure my FN035 values are close in most areas but perload is still >1 in a few spots. This must be my problem.

I just finished increasing high slope to remove 9% fuel as per Decipha's instructions (Lambse - actual Lambda). Applying the same formula, I think I'm currently 3% LEAN:

Lambse: .852 - actual Lambda .88= -2.8%

It's almost like I overshot the mark a little with my last correction? Please feel free to correct me if I'm bass ackwards again!

Sean

EDIT: changed my wording to not confuse people (like me)
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Re: developing a plan

Unread postby blocmi » Wed May 27, 2020 4:29 pm

Last time the computer was commanding 1.11 but your wideband was reading 1.02, your engine was getting more fuel than commanded, so you were richer than commanded.
This time the computer was commanding .852 but your wideband was reading .88, your engine was getting less fuel than commanded, so you were leaner than commanded.

Again, I think overshooting is common, and should lessen with each adjustment.

IMO, 3% is in the ball park I wouldn't sweat over it.
In addition to dialing FN035, I'd adjust low slope if needed because low slope is going to affect your total fuel.
Circle back and tweak the high slope if it's still not to your standards.
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Re: developing a plan

Unread postby canuck1 » Wed May 27, 2020 7:27 pm

I don't have enough experience to know if I'm in the ball park or not, so I appreciate the tip. I split the diff and decreased high slope by 1.5% because I can! :)

I'm working on the low slope end next as per Decipha. I know it all comes together in the end but I'm sure I'll ask more questions before I'm there!

Sean
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Re: developing a plan

Unread postby decipha » Wed May 27, 2020 7:48 pm

the wot lambse multiplier adjusts lambse so it makes no difference for dialing in fuel.

simply multiply the high slope by 0.97 and your fuel up top should be spot on.

multiplying by 0.985 for 1.5% is fine too makes no difference.
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