Setup is a Turbo 4.8 that will be pushing high boost, 24-30 psi and will have a power range of roughly 6000 to 8000 rpm.

​I don't know how badly the NNBS/TBSS intake manifold will hurt power at 7000 rpm versus a Holley Hi-Ram for example. Some have said the LS6 intake might be a surprisingly good option over the typical metal intakes up to 7500 rpm.

 

Look at the BTR Trinity intake.

 

Thank you, I'll check it out.

 

Jack Roberts (Squirrel tuned) ran an Edelbrock Pro Flo intake manifold when he made his stock 4.8 record 1/4 mike passes. It looks like the Btr Trinity makes a touch more above 6500 rpm versus the Edelbrock. Holley Hi-ram would be way too tall for my hood/application, but it looks like the Edelbrock is lower than the Hi-ram (and makes nearly identical power according to a Holdener video).

So on paper, it will be a choice between the Btr Trinity and Edelbrock Pro Flo. Assuming a TBSS intake manifold will heavily nose over by 7000 rpm versus the Trinity/Edelbrock, but have yet to see a direct dyno comparison.

 

I think I have my answer now, definitely doesn't seem like the TBSS will be one of my choices, seems to dip down too hard up top.

 

If you have rec port heads, you might consider short/mid runner FAST 102.

 

I have Cathedral heads but thank you for the suggestion.

 

Dyno graphs comparing intake manifolds are a bit unreliable when it comes to finding out where power falls off. A lot of that is based on the setup itself. A turbo setup is more likely to hold power better up top, and a different camshaft could have completely different results yet again.

My stock gen 3 truck intake manifold was still climbing in power above 7000 RPM in my old 4.8, but I very carefully chose my cam/turbo combo as well as header primary diameter/length/pairing etc to make sure everything worked right.

 

Very good point, I like real world chassis dyno examples like yours over the engine dyno. I'm impressed the gen 3 truck intake climbed so high up, what cam specs again? Thanks

 

226/232 110 LSA with 4 50mm turbos. Completely stock Gen 3 4.8 otherwise. Went 9.80 at just 9 PSI with a converter that was so tight it took me almost 8 seconds on the line to hit the 2 step limiter and I was dropping 2600-2800 RPM on the 1-2 shift, shifting at 7600. It would have had 9.50s at that boost level with just a converter swap. Crazy efficient setup.

 

That's incredible, nicely done. I have a Tick Stage 3 cam in mind for my 6000-8000 rpm 4.8 idea but it's a 223/227 114+3, now I'm wondering if I should go with more duration like yours.

 

I definitely wouldn't use a camshaft that size for an 8000 RPM goal, even on a 4.8.

 

Mama ported FAST. Nothing can touch it.

 

You mean MamO......