Hello everyone. I am tuning a 2007 Ford Mustang GT/CS with a ton of things done. Namely, a 302 stroker, stock heads, stock intake/TB, mild blower cams, and a single turbo. I still have VCT in place with 20 degree limiters and CMCV deletes. I've got my car running pretty good but cold starts are still very rough and transient fueling is still kind of funky, with lean tip-ins and rich lift-offs. I am thinking this is all related to the speed density section of the tune.
The car on cold starts experiences extreme hesitation and lean spikes with rapid throttle movement, such as when taking off at a light. It feels like I don't have enough accelerator pump on a carb. After the engine reaches near operating temperature, it runs very good, with some light lean tip-in and rich lift-off.
I have been reading a lot and I understand the linear relationship of MAP and MAF, or VE and airmass. It seems "MAP at Zero Airmass" is the intercept and "MAP per Airmass" is the slope. I know the formula for calculating cylinder airmass and I have it logging in my scanner but without knowing MAP on these cars, it is extremely difficult to tune these tables. Should I get a MAP sensor and plot Airmass vs MAP and set up a few histograms for each of the RPM breakpoints of the tables, restricting based on cam angle and find the line of best fit or is there a way to calculate MAP based on engine parameters I can log? How does everyone else do it? I know there are some pretty radial stroker/big bore combos out there that are street driven so these tables must be tuneable.
Any help on this would be greatly appreciated.