Enki
Motorhead
My quest for lazy might be at an end (or as close to an end as I'm gonna ever get).
Today I stumbled across something that could prove to be rather time saving; I realized I could cannibalize RFinkle's polynomial MAFCAL smoother thing he made for me, and generate an entire (probably perfect) MAFCAL from just three (well, four) data points.
That's right kids, for the low, low price of a hot idle, steady state cruise, and WOT log, you to can generate a MAFCAL for your car by simply entering three separate voltages and three separate (corrected) massflow values.
You're probably wondering what this looks like.
Here's the input:
The low voltage cutoff is for big intakes that throw the ole crank angle code on cold starts. As pictured, any voltage below 0.9 will have a massflow value of, well, 0.
As for the four volts / massflow entries, the first one you probably won't ever need to edit as it's going to be known good 100% of the time. As for the others, well, the neat thing is that the voltages don't have to appear on your actual MAFCAL for them to be useful in generating the calibration. This alone is super, duper handy.
How does it compare? Have a look:
You'll likely have to zoom in to see it clearly, but Calibration 1 is what I currently have on the car, and Calibration 2 is the new calculated curve one.
Some notes on the comparison:
My logs show me running a bit rich in the 3.8v range (WOT), as well as fuckin hella rich in the 1.25v range (hot idle), and 2.15v ish range (light cruise) is only slightly less rich. The above graph seems to pan out on those corrections, and the numbers entered on the input side are exact in the curve (as they should be).
Unfortunately, since I'm not logging actual massflow, I've had to guess on correct values, but I'm pretty confident this will be closer than ever.
So, what can be done with this?
Well, for starters, you can plug in the voltages and massflow amounts into the inputs and generate a MAFCAL for any year car instantly, or even all years at once (more on that in a minute).
So, what do I need from yall?
Well, data for starters.
1. Year/model of car
2. Tuning device used
3. Voltage curve from the MAFCAL portion from your tuning software
4. Voltage and corrected massflow value for hot idle
5. Voltage and corrected massflow value for cruise
6. Voltage and corrected massflow value for WOT
NOTES:
It will be significantly easier for you if you have open loop trimming disabled (if supported) and you're also logging massflow.
VT People: Try to log as little as possible for the best resolution / response time for these logs.
Y'all provide me with this information, I'll poop out a MAFCAL that you can then compare to your existing one and if it looks good enough, test it out.
All goes well, I'll do some spit-shine on the sheet and release it for general consumption (ODF format so anyone can use it on any platform).
As always, questions, comments, concerns, and (constructive) criticisms are always welcome.
Today I stumbled across something that could prove to be rather time saving; I realized I could cannibalize RFinkle's polynomial MAFCAL smoother thing he made for me, and generate an entire (probably perfect) MAFCAL from just three (well, four) data points.
That's right kids, for the low, low price of a hot idle, steady state cruise, and WOT log, you to can generate a MAFCAL for your car by simply entering three separate voltages and three separate (corrected) massflow values.
You're probably wondering what this looks like.
Here's the input:
The low voltage cutoff is for big intakes that throw the ole crank angle code on cold starts. As pictured, any voltage below 0.9 will have a massflow value of, well, 0.
As for the four volts / massflow entries, the first one you probably won't ever need to edit as it's going to be known good 100% of the time. As for the others, well, the neat thing is that the voltages don't have to appear on your actual MAFCAL for them to be useful in generating the calibration. This alone is super, duper handy.
How does it compare? Have a look:
You'll likely have to zoom in to see it clearly, but Calibration 1 is what I currently have on the car, and Calibration 2 is the new calculated curve one.
Some notes on the comparison:
My logs show me running a bit rich in the 3.8v range (WOT), as well as fuckin hella rich in the 1.25v range (hot idle), and 2.15v ish range (light cruise) is only slightly less rich. The above graph seems to pan out on those corrections, and the numbers entered on the input side are exact in the curve (as they should be).
Unfortunately, since I'm not logging actual massflow, I've had to guess on correct values, but I'm pretty confident this will be closer than ever.
So, what can be done with this?
Well, for starters, you can plug in the voltages and massflow amounts into the inputs and generate a MAFCAL for any year car instantly, or even all years at once (more on that in a minute).
So, what do I need from yall?
Well, data for starters.
1. Year/model of car
2. Tuning device used
3. Voltage curve from the MAFCAL portion from your tuning software
4. Voltage and corrected massflow value for hot idle
5. Voltage and corrected massflow value for cruise
6. Voltage and corrected massflow value for WOT
NOTES:
It will be significantly easier for you if you have open loop trimming disabled (if supported) and you're also logging massflow.
VT People: Try to log as little as possible for the best resolution / response time for these logs.
Y'all provide me with this information, I'll poop out a MAFCAL that you can then compare to your existing one and if it looks good enough, test it out.
All goes well, I'll do some spit-shine on the sheet and release it for general consumption (ODF format so anyone can use it on any platform).
As always, questions, comments, concerns, and (constructive) criticisms are always welcome.
