Understanding VE and MAF

[98 tigershark]

Hey guys,
I have been playing with the VE tables and found some tips that may help newer tuners. Assuming that you have scanned your car for maf and VE.
Open a copy! of your current tune. Change the VE % to 100% for all the cells and save it as 100% VE. Then open it again. Change it from % to G/S with the change setting option. Save as 100% G/S VE. Next open the new 100% G/S VE tune, and open your current tune using alternate calibration for comparison. In a second window open your current tune as read only, with the normal VE table in %. Then open a large scan that logs VE and Maf, with allot of different speeds and rpm ranges. Select different areas of your scan and make sure it tracks the linked cells with all three tuning files. Then you should be able to compare the air in G/S that your motor produces verses what 100% VE in G/S is. If you multiply the VE % of your normal tune times the 100% in G/S, it should equal the G/S on your VE table. Lets say 100% in G/S is 400 at 6000 rpms and 90 map KPa and I want 75% ve I would multiply the 400 grams per second x 75% and I should have 300 grams per second. But the Maf in G/S should be fairly close to the 100% or 400 G/S. The Ve does play catch up to the Maf. This is not exact, But this process can give you a better understanding of the relationship of the VE and the Maf. Once you can understand how the motor breaths then the spark and fuel is next. This is only to help learn on natural aspiration and is an example only!! You should never ever load a 100% VE TABLE OR CHANGE YOUR MAF UNLESS IT HAS BEEN MODIFIED!!!!!!!. This really helped me understand. If this helped some newbe tuners, next week I will try to post the formula for injector flow and a formula for base pulse widths.
98 tigershark

[jfpilla]

Hey Thor,
I'd like to see some of the high tech guys chime in.
Sounds intersting.
Joe