@FWJ posted:Thanks for the info. I am not yet into port injection (also it’s quite expensive). I will keep that in mind in case things go south. The updated Sniper-2 (which is essentially the AMD Atomic-2) has been increase to 800cfm (versus 750) and holds now up to 650hp and has no limitation on camshaft sharpness any more. In my case the setting for street/strip is 8“ to 13“ vacuum in the manifold and my camshaft is ranking in the race area of below 7”. However, my manifold produces still 6” of vacuum, so just a bit on the “race” side 😎. I think and hope that everything will be fine with the Sniper2. In any event Holley provides besides the self-learning also direct laptop support for fine tuning.
That is the issue with the fouling. The MAP is beyond it's limitations in determining if the engine is under load or not with only 7".
I don't know how you compensate for that unless you find a current production vehicle that has a very low vacuum reading at idle and can wire it into your system?