Quote Originally Posted by Fivefingerdeathpunch View Post
PE is a set it and forget about it table, raping the PE table to bring in fuel or take fuel out isn't how you are suppose to do.

The MAF curve is the end all be all fuel control, it's measuring the amount of airflow coming into the engine and that determines how much fuel needs to be given.

So if you are having too much or too little fuel according to your wideband you adjust the MAF curve to fix it. Adding to the curve lowers the air fuel ratio and taking away will lean the air fuel ratio out.


Very small adjustments is all it takes. Say you are running 11.7 with a commanded AFR of 11.5 you would add 1-2% to the curve above 7,000-7,500hz or so on the MAF curve. Make sure there is no major dips or bumps in the numbers, smooth as needed.

HP Tuners has a graph we view to see the whole curve, I assume DHP can do this aswell.
Thanks,

That all makes perfect sense, and I have been using the table modifier program to get the fuel trims all corrected. Also, I don't have a wideband yet

My issue that I described above was discussing the commanded AFR, not measured. It was commanding an ultra rich mode upon entering PE. It looked like, based on my brief inspection, when the PE kicked it into the 10's, knock would occur. Take a look at the commanded AFR column to see what I am talking about, if you want.

In DHP, I think my main PE vs RPM table is fine, ( it actually is set to go to 12.4 I believe,) but it also goes very rich very quickly per my PE modifier vs Time table. I pulled it from an overkill tune, which probably isn't recommended.

Anyways, what AFR would you recommend when I am in PE?



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