Tune 'n' 'charge 'n' tune

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Tune 'n' 'charge 'n' tune

Postby Loren » Fri Nov 30, 2018 7:27 pm

Familiarity breeds contempt. Or something.

Sounds like you're continuing to make progress. It's just like developing software (or engineering ANYTHING). The Apha version is all sorts of buggy. Then you apply what you learned to make a better Beta version. And eventually, the 3rd or 10th revision starts getting pretty refined.
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Tune 'n' 'charge 'n' tune

Postby Native » Sun Dec 02, 2018 10:51 pm

20181202_140656-1.jpg
So I decided to keep autotuning. It keeps getting better with no enhancement. Still not good enough...but better.
Since Tgiving I've got over 3 hours just driving around running autotune.
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Tune 'n' 'charge 'n' tune

Postby Loren » Sun Dec 02, 2018 10:59 pm

If you set the resistance to change to "hard" or "very hard", it will take longer to get each cell to go green, but you'll get a more accurate tune. (maybe you're already doing that)
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Suck Less - Drive something resembling a proper racing line.
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Tune 'n' 'charge 'n' tune

Postby Native » Mon Dec 03, 2018 9:54 am

It's been on "normal." The picture above took about an hour. But, I had planned to make the change you suggested, and will probably lock out the dark greens along the bottom. Those cells have thousands of hits.
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Tune 'n' 'charge 'n' tune

Postby Native » Thu Dec 27, 2018 6:42 pm

Over the past weeks, I've autotuned the heck out of it, and ended up with what must be a pretty good tune. I say that cuz without any enrichment settings, the thing was pretty darned driveable. Yeah, it still had the hesitation but far less intrusive and severe.

So, I started messing with the enrichments again, and had planned to get into the "enhanced acceleration enrichments" but really didn't want to (fairly complicated). So, instead I decided to fool with the settings that tell the computer how close to wide open a given throttle position is, as a percentage of wide open. I had set it to 100% - meaning to have the computer see WOT it had to actually be at 100% throttle - at any given rpm. Well, that has the effect of delaying the timing of the enrichment pulses (and I think the algorithm may also reduce the size of the pulses too, maybe). I was having a bog by simply touching the throttle - air in no gas - so by adding a bit of enrichment, and reducing the percentage setting from 100 to a range of 10 at low rpm and 40-50- at high rpm, throttle tip-in is now nice and smooth, and mild-to-mid speed throttle movements are also quite nice. So clutching off from a start, normal throttle transitions during shifts, even rev-matching all work pretty well right now.

I'm still chasing the hesitation at sudden full throttle inputs made after a full or near-full lift. Datalogs show the bog is because the enrichment is making it super rich (as opposed to lean). I'm pretty sure that if I continue to chase the proper %WOT setting for the TPS at X rpm, and reduce enrichment at higher throttle change speeds, that I'll get there.

I'm confident to say solid progress. And I still have a few holiday-days-off yet... :thumbwink:
Steven Frank
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Tune 'n' 'charge 'n' tune

Postby Loren » Thu Dec 27, 2018 7:13 pm

8-)

Way to go, Steve!
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The "Push Harder, Suck Less" philosophy explained:
Push Harder - Drive as close to the limit of your tires as possible.
Suck Less - Drive something resembling a proper racing line.
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Tune 'n' 'charge 'n' tune

Postby twistedwankel » Thu Dec 27, 2018 8:11 pm

Native wrote:I'm confident to say solid progress. And I still have a few holiday-days-off yet...
I saw it leaving the parking lot yesterday. :thumbwink: Saw it 2 years ago under a tarp or something?
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Tune 'n' 'charge 'n' tune

Postby Native » Thu Dec 27, 2018 8:45 pm

twistedwankel wrote:Saw it 2 years ago under a tarp or something?
Lol. Over time it's been used as a shelf for a variety of items...
No more! I say...
Steven Frank
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