Adjusting Cam Fuel Tables ?
Hi all,
Just wanted to post this to get some feedback from the more experienced on this forum to see if I have it straight. I have the 30004 power adder system I am using without boost or nitrous at this time. Getting into the tuning and found the fuel table menus for the different cam settings.
So the way I understand is that these base cam fuel values don't change unless you manually change them etc. My take is the fuel learn percent that you see on the dashboard at different times is what the system has learned (and is using) to compensate from these base fuel tables at whatever MAP and RPM and AFR target you are running at. The fuel learn value is what it has integrated from the average fuel trim values at these conditions based on your AFR etc and this is the fuel learning aspect of the system. So essentially the system creates a learning compensation curve (%learn) to adjust the base table.
So thinking that I could theoretically manually adjust these cam tables to achieve a better (or perfect haha) fuel tune where the fuel trims and fuel learn approach zero compensation at most of the conditions. For example if my Cam2 fuel value for 900RPM at 40 MAP =80 and my fuel learn value is consistently -20% at this point then lowering this Cam2 base value by 16 or 20% should technically get me close to the correct value. Of course the values must be interpolated and probably massaged a bit between points.
Anyone experimented with this and is it worth the effort to get things closer to ideal? My thoughts are that if the base fuel table is closer to what you need you can save it from trying to compensate too much in the first place. Then maybe even lower your fuel trim and learn limits to prevent it from getting way out of whack if say an O2 sensor goes a bit wonky over time etc.
Thanks
I was wondering the same kind of. So my idea was on cam table 3 from idle to around 2700 rpm runs amazing and on up runs good as well. However on cam table 4 from idle to 2700 has a small hesitation and almost a studder, but after that from 2800 rpm and up it’s absolutely amazing how it runs. So I was thinking about taking the beginning of cam table 3 to 2700 and putting those percentages into cam table 4. As soon as I went to cam table 3 the studder went away.
I was thinking of doing the same thing, but just at idle. I ended up going to cam 3 to get the learn value from the max, but the drivability wasn't the best for quite some time. I decided to go back and drivability is much improved on cam 2, but the idle is still between 33% and sometimes pins at 35.2%. The cam 3 idle seemed to be much cleaner too, but don't want to mess with it too much because everything else is so much better.
I went into the handheld and changed the Cam 2 500 rpm values to match the Cam 3 table and it really helped the trim come down to a more reasonable 20-25%. It's not perfect, but it's still learning, so let's see if it comes down a little more as it learns.