Ok getting all defensive... not sure where to even start with this response. Not a single number you've posted thus far has been correct so I'm not sure what you've measured... all you've posted is assumptions that appear to be incorrect. And I think your comments now about symmetry are just as much of an assumption that you're supporting with name dropping. Not much worth googling from what I've seen so far...
I've posted the n54 cam profile, per frankenturbos plot, and the n55 profile, per the bmw academy docs (click my google drive link). Maybe someone like yourself with more experience can point out the difference in ramp rates? With the naked eye, and also looking at those cam graphs, I see pretty symmetrical curves and lobes. What exactly is it that you've seen and measured that you're alluding to?? Are you trying to say that the n52 cam wont increase overlap? That it has a less aggressive closing ramp or something? Just not sure what you're trying to say... and I dont have an n52 cam profile to look at that you might be basing your assumptions off of.
Yes, I think we covered already that n52 cam has slightly more duration than an n54 cam. 2* per bmw. No one needs to measure anything to know that much.
I dont have any info on the n53 cam but please share what you have... the point was that putting the n52 cam into an n55 to capitalize on the 3%/.3mm marginal increase in lift is also going to result in even more than that 2* additional duration. Duration and overlap not being good things within the context of the hybrid turbo ps2 and as evidenced by the dyno that saw no tangible gains at 6200rpm+.
Please provide more context to your post. We're all just trying to work through how we can take advantage of these part swaps.
Take another look at Frankenturbo info, do you spot the mistakes, some info is correct but some is incorrect? They have rocker ratio as 1.5 and this gives wrong valve lift info.
Did you notice that the N54 exhaust cam has a duration of about 243.X degrees at 0.004", did you see what I stated : I stated " 241+/- 2 degrees at 0.005"
I've spotted Webcams mistake on what you shared, do you question this?
Rocker ratio being 1.64 or 1.66 how does this change anything. 5.9mm cam lift x 1.64 = 9.68mm valve lift, while if we use 1.66 we get 9.79mm. 0.11mm difference (we are arguing over 0.11mm??? that is the thickness of a loose leaf paper, is that a difference worth an argument, that can be easily attributed to so many factors. I measure the rocker ratio from the rocker itself with my precise Mitutoyo tools. Maybe others measured by comparing the valve lift vs the cam lift, again the lifter may be or may not be primed creating questionable info.
Do you know what an assymetrical cam is? take a closer look at the Frankenturbo graphs "you" provided, look closely at lifts below 0.020" do you see the difference between the opening and closing part of the curve? If not, look closer. The closing side of the curve is extremely important if you wish to increase revs on the engine. Slowing down the rate at closing allows for valve float control.
Are you aware that we can control overlap with VANOS timing from the exhaust cam OR also from the intake and exhaust cam?
The N52 exhaust cam is an excellent cam swap on the N55 and N54, I recommend others try it if you have access to a tuner than can adjust Vanos.
The 100whp statement is very very questionable, but I'm sure you can achieve 40-50whp gains if you're boosting around 15-20psi.
I'm still questioning the rocker ratio difference between the N55 and other Nseries cars so I just placed an order and will confirm my conclusion.