Lose of power at higher rpms

[Cabriolet]

Jaxx, the numbers are from the wide band o2 just past the x pipe. pre-cat. Yes, valves are dead on .01+-.002" and i don't have the timing map. the tuner has that but i think we need to do more work on the tune.

Digger, i live in nazi-CA, you keep it stock here or else you can end up popping the hood and ending up with a fat ticket. the car needs to appear stock. i've seen plenty of people run 200+ with the stock afm. i may go RHD ITBs+haltech but there is a ton of risk.
As for the 272, bimmerheads advised using the larger cam but i really need it to be driveable in traffic. we have traffic like no other place here in CA. i am thinking i should have gone with the 288. but i do have +1mm valves.
the pistons are nice ones from Ross:

https://www.instagram.com/p/BdjDAUwHi5A

bimmerheads did the head. they ported it, put larger seats in, new guides, etc.

[digger]

as to the question that's limiting power
- AFM, piss it off and get a standalone and a good tune (why use agricultural EFI on a big $$ rebuild)
- stock intake limits power alot but you are still down on whats possible
- 272 cam is too small (not enough lift or duration) to make it peak hp rpm near what it does with a smaller engine when used with stock manifold.
- are your pistons generic type? that might be why youre getting pinging and why youre timing is not allowed to be optimal
- who did the head?

[Jaxx_]

the afr numbers are from a tailpipe sniffer? They can read leaner than a wideband closer to the motor by .5-1 AFR.

Are we also assuming the valve clearances are within spec?

What does the timing map look like?

[Cabriolet]

Doh I messed the afr numbers. Plz see the graph, the are good 14-13 throughout the pull

[MrBurgundy]

That's super rich, my guess would be the tune is the limiting factory, or whatever is causing it to run that rich.

Are you sure its pinging? It seems like if it's that rich, its going to miss randomly before it pings.

[Cabriolet]

Engine specs:
Everything is new or rebuit.
M20b30
Ported/polished head
+1mm valves
272 billet cam
10:1cr
S50 crank/s52 rods/custom pistons
19lb injectors
Protune Long tube headers into dual s50 cats
New-ish fuel pump
Rebuilt AFM
Stock intake manifold
Custom tune, still a work in progress. Afr is 11:1 throughout the range.

The car pings pretty bad when it is hot outside even when running rich. And I'm clearly not getting the peak horsepower for that amount of torque.

For a healthy engine what do you think is limiting the power?

https://youtu.be/95r_Lng0Tqk