SD to mass air, back to SD?

[srv1]

Originally posted by Yan88gt
It's not the change in vaccum that make the speed density idle bad. It's because it can't add extra fuel. If you add 30% more air on a mass-air car, it will increase the duty cycle( pulse ) of the injectors but not speed density, it have fix tables in the computer. So if you add 30% more air on SD you will need to add 30% more fuel. How? With a fuel pressure regulator or with custom chip wich increase the duty cycle of the injectors. I do not have a cam on my car but if i lower the fuel pressure it will run like crap.

Yan, i agree with 95% what you said. BUT the SD reaches its limits on the fuel table very quickly as with MAF, its limits is much higher, with this situation. yes a reegulator will help, but if you want to get the most out of your B cam with SD, use a fuel regulator, better fuel pump, and a custom chip! as for the idle, it will idle crappy, but if you go the way i said, that should take care most of the idle problems. if you still have idle problems, use the idle plate that you can get out of mags and even FORD! im not sure what is the correct term for this part, but i hope you know what i mean. keep us posted! it CAN BE DONE! good luck.