Question bout maf tables
05-10-2011, 11:19 AM
#3
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MAF airflow vs freq table. But the problem is, once you
hog it out nobody knows nuthin' about what's right.
I recommend, if you just have to do it, that you take
some hard pulls' worth of data before / after changing
nothing but, and using the MAP*RPM index, refit the
table to show the same airflow value for whatever the
new frequency is at that MAP*RPM. This should be at
least roughly right.
hog it out nobody knows nuthin' about what's right.
I recommend, if you just have to do it, that you take
some hard pulls' worth of data before / after changing
nothing but, and using the MAP*RPM index, refit the
table to show the same airflow value for whatever the
new frequency is at that MAP*RPM. This should be at
least roughly right.
05-10-2011, 07:50 PM
#4
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I do have access to a wideband but I'm not tuning for WOT yet and at part throttle, the wideband and stock are very close. Problem is, I ported my maf back in 1999 and had the car tuned. The car always got kr immediately as I got on the gas which means the tune was never right. I now have a new engine with better heads and a bigger cam and just didn't know where to start. I don't have the data logs on my laptop to post them. I do know that it's running way lean, getting 10 degrees of kr., fuel trims are at +25%. I just need to know what to try first.
05-11-2011, 05:11 PM
#5
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I do have access to a wideband but I'm not tuning for WOT yet and at part throttle, the wideband and stock are very close. Problem is, I ported my maf back in 1999 and had the car tuned. The car always got kr immediately as I got on the gas which means the tune was never right. I now have a new engine with better heads and a bigger cam and just didn't know where to start. I don't have the data logs on my laptop to post them. I do know that it's running way lean, getting 10 degrees of kr., fuel trims are at +25%. I just need to know what to try first.
05-11-2011, 05:43 PM
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Regardless of whether or not you're tuning at WOT you should still use a wideband. Just set up a histogram to log afr error versus MAF frequency and do copy, paste special, multiply by percent just like with your VE table.
