The second part of my strategy is to limit total airflow with a restrictor plates as someone on here suggested a long time ago. EFI isn’t as sensitive to big TB’s as having an oversize carb. There is no need to keep air velocity high through the boosters for a good signal (there are no boosters!). A 105 mm single bore TB will flow somewhere around 1100 CFM, as far as I have been able to find out . Those are being installed on 5.3 engines regularly with no issues, but the 2000 CFM that this thing can flow is just crazy. A 5.7 engine can only flow so much air based on volumetric efficiency and RPM, no matter how much potential air flow is available. I doubt my engine will need more than 850 CFM (if that much), so I have a bunch that I can throw away.



This restrictor plate limits air flow to around 1200 CFM for the pair. I know the primary bores will most likely need to enlarged. My “back of the envelope” estimation says a pair of plates will flow 350-400 CFM , wide open, on the primary side, but the progressive linkage stages the secondaries well before half throttle. Since this is port EFI, the restrictor plates only have to flow air, no fuel. This pic is of the unfinished plate. The holes have been radiused on both sides.

This is just an experiment and may be crazy. I can always pull them if they cause issues.



I also had to build a custom throttle cable mount. The car will have cruise control, so had to have 2 cables.