So, I'm looking into squeezing a bit more power out of ye ol' rev-up motor. I have test pipes on the way, and I started thinking about the whole mrev and spacer dealy. Now, I plan to go FI in the not so near future, and I'm under the impression that the mrev may end up losing power when boosted.
Why? Well, it's based on the longer runner design from the non rev-up motor. The longer runners help with intake velocity at lower flow rates (like mid-range n/a power), but start to take it away once you try pushing higher mass flow through there. This is evident even from N/A dynos where they lose power at the very top of the powerband. When adding FI, the mass flow condition of the top of the N/A powerband is reached much earlier (not sure when, and don't have enough detailed info on the VQ to calculate it)

I have a similar concern about the spacer. I can see how it would make power on the older lower manifold and mrev, but I question what gains (if any) are to be had on the rev-up without adding the mrev. All of the dynos I've seen for the spacers were on the older LIM, which seems pretty convenient, because it will give more flattering results.
Pretty much what I'd like to know if there are any dynos of the following:
Stock rev-up with 5/16" spacer
Stock rev-up with 1/2" spacer
Mrev2 on a rev-up without a spacer
Mrev2 rev-up with 5/16" spacer
Mrev2 rev-up with 1/2" spacer
Mrev2 rev-up with 5/16" spacer with Turbo/SC
Mrev2 rev-up with 1/2" spacer with Turbo/SC
Stock rev-up with 5/16" spacer with Turbo/SC
Stock rev-up with 1/2" spacer with Turbo/SC

I doubt anyone has went far enough to test all of these with the exact same setup, but on the off chance that this data exists, I'd really like to see it.
I'd also appreciate some input from redlude or anyone else with more than a basic understanding of fluid mechanics.

 

No one has any data on any of this? Is there any gains to be made by putting a spacer on a revup?