I have a Bill Blue 351 kit to install on my KLX300 but I don't have a great feeling for the fueling of the bigger bore. I have some experience tuning GM fuel injected cars including changing injectors. So sad it is still winter here and I had some time on my hands so I installed my innovate LC-2 wideband in a short extension pipe I made to go between the head pipe and the factory muffler. I since purchased a Healtech Ilogger EZ to log data on the stock ECM on the stock bike.
I will keep everyone update as I progress.
Should be able to log RPM and AFR this weekend TPS early next week.
The bike now has the secondary throttle plate removed and a shortened KDX snorkel.
I may reinstall the factory snorkel for a baseline by I don't plan on reinstalling the secondary throttle plate because it just works so much better this way.
Stay tuned

Pun intended 😅
Adding app to read logs
https://play.google.com/store/apps/details?id=com.healtech.ile
I will attach the logs where appropriate.

 

It will be interesting to see the open loop operations that were within the "detune envelope" of the secondary throttle plate.. That rpm range should go lean after STP removal - how lean is unknown.

Also, you do realize that your top end power is muzzled via the ECM's programming.

 

Yep. Sure do. I am not sure if I will care about the power up there. If I do find that I want it, I will buy a JDM ECU.
I know what it is and what it isn't.
I just wanted to contribute to the cause with something that as far as I know hasn't been done.
I want to study the open loop, closed loop and at what point does it change?
I will study it for a bit before I even disable the PAIR valve. I might reinstall the secondary throttle plate if there is enough interest.
I really like the bike, I just want it to be the best I can make it.
And share my journey.

 

Yes, bravo.. We need detailed information about stock fueling from off idle to redline.

 

Well, I think the stock ECM does a great job fueling. There's a little to be gained by adding a small amount of fuel but I don't feel it's with chasing. I will log some more and see what it shows. The rpm isn't quite right. I didn't know what the tooth count is on the crank wheel.

 

Ahh, the chart has no X/Y values.. Did it ever go lean - 13:1 or more ?

 

Maybe 13:1. the yellow vertical line in the center of the screen is the point in time values are displayed on the top of the screen. The purple line goes max lean on decel.
Stoic on cruise below 85% TPS.
Will log more when I get a chance. Weather is just starting to come around.
If you like, well I'd love for you to download the software-app and I can share the log with you for your opinion...

 

You can count on me for help with this project..

What we need is a WOT pull from off idle to as close to redline as safety permits, in one gear.
I am unsure which gears would permit this - maybe 3rd, maybe 4th, BUT you will need to do this in as many gears as possible - 3rd, 4th, maybe even 5th.
The AFR data, for each pull, needs to be displayed on a graph with X and Y axis values as below.

 

Thanks for the help!
I will do each gear, but I don't see how that matters. Alpha N uses throttle position and RPM. Should be the same in all gears.
The pull I showed above is 4 the gear, uphill. From idle to 8500.
I bet if I put the secondary throttle plate back in, you would see the "dip". I think the longer I draw out the rise the more consistent information we get. Like doing a steady state pull on a Dyno.
I don't feel 13.2 is dangerous for as short of time it is there at the 4k RPM range. The rest around 12.3 -13.0 is perfectly acceptable to me.
If you download the Healtech iLogger ez software, I'd be glad to share the pulls.
I hope to export and display in a surface chart.
That's what I am accustomed to looking at in HP tuners.

 

Alpha-N ... Haven't heard that term in, like, forever.. Apha-N efi solutions are historical footnotes. However, Speed Density blended with a smattering of old Alpha-N is still relevant. Also note that as Alpha-N evolved, it became infused with what became Speed Density tech ( manifold pressure and intake temp inputs for "on the fly" altitude + ambient temp fueling adjustments.)
Certainly the KLX ECM is a modern speed density solution (using a "modeled airflow thru the throttle body" table instead of a mass airflow sensor) as Alpha-N has never been able to pass emissions testing. ..
If Alpha-N is being used, it could only be for open loop ops that are well above any emissions testing envelope, in which case the transition into this area would see an abrupt change in AFR.

WOT ops that see 13 or more is in need of enrichment (as power is being left on the table), but yeah, 13.2 is not dangerous.