The only issue I have with this statement is that it's so broad and unqualified (unqualified statement, not the person). Obviously more timing gives the large gains, but what it doesn't address is if the cam is what is ALLOWING the added timing. Perhaps if that person doesn't want to be involved, either tell them to refrain, or play intermediary and get them to be more specific about it.
I installed a cam in my LT1 Camaro years ago. It was tuned prior to the cam and made 300whp. Post cam on the same tune it made 320whp. After re-tuning for the cam, guess what - it took more timing - it made 360whp and had a max gain of 100whp since it peaked at a much higher rpm. I had the rev limit changed too.
Based on that, everyone here would be saying that the re-tune is what made the power, but that's not the case and anyone that understands tuning would laugh. Ya'll put too much faith in JUST the tune, without realizing that the tune is the optimization of the parts assembled.
Finally - everyone is saying his numbers are about right for an N55 PS2 car - 520WHP is the norm for 93 octane on an N55 with PS2s? Those look like E40 or E50 type numbers. Now, if he's running E40 or E50 timing values without corrections, then maybe, just maybe the cam is changing the VE enough to allow that, and thus it is what made the difference.
If 520 whp is 93 octane PS2 N55 numbers, I'd think 575 - 580 is the norm for E50/E85 then? I didn't realize they were that high.
You're making a lot of assumptions, and defending this thread, based off a bunch of anecdotal experience. Look at the logs yourself...
He is spraying meth which has an effective octane rating of 119aki. Compare OP's logs to these:
https://www.1addicts.com/forums/showthread.php?t=1405434 A simple E30 mix (approx 97-98aki) at 18-20psi makes 500whp. OP is pushing 22psi and more timing and you're baffled how he made 530whp? People have pushed PS2 turbos to 560whp+ now I think... Keep in mind that this in in the mid-range and produces a shitty power curve. PS2 is more realistically a 450-500whp turbo.
Before I go any further, we don't even know if the logs provided are from the before/after dyno. OP removed the date and timestamps from most of the file names. Weather was clearly different in the logs he posted and STD correction factor used on the dyno doesn't account for ambient pressure changes. He also provided multiple logs, so, which one actually correlate to the dyno pull comparison? Anyway, i'll keep going based off the logs that have been posted...
The "after" tune added about 4-5* of timing. If OP is OK with depending on the even distribution and consistency of his meth delivery system for supplemental fueling/octane than more power to him. Most people just use meth for it's IAT suppression and tune for their base fuel octane. Meth stops spraying, or doesn't get distributed evenly, car won't go boom...
Also consider that the dyno plot converges at 6200rpm+ despite the 4-5* increase in timing. Nothing was really gained anywhere expect in the mid-range where the throttle closure is seen in the "before" log. One of the "before" logs even shows the car hitting and torque limiter and going into limp mode at 5400rpm+. Look for yourself:
Graph 1: 2019-10-09 11_36_17 000021571DAA01 PS2-XDI_WBA3A9G52FNT09915_v9-N52Cam_v2b.mhd.csv - Tune N52 Cam - Unfinished Graph 2: 1571191517604_2019-10-03 16_01_28 000021571DAA01 PS2-XDI_WBA3A9G52FNT09915_v9.mhd.csv N55 Cam Graph 3...
datalogs.spoolstreet.com
There is no point debating this further unless someone can actually show the cam profiles are indeed different enough to have a meaningful impact on a dyno. Otherwise, there is so much that can be nitpicked at with what's presented here that I don't see how anyone could read this and think that this is a useful mod. People have provided counter-points that explain away every bit of what is presented. Different weather, different tune, issues with original tune, cams are reported to be similar profiles, OP claims to have made over 500whp himself without the cam change, etc. We all get excited about the cool shit we do to our cars. Not knocking OP at all for that! Hopefully OP can prove us wrong. BPC should easily be able to provide cam data to him since they supposedly mastermind this whole concept. Lets put more scrutiny on BPC instead of OP. Did they swap this cam in on good faith, or, did they just straight up rip OP off? That's what I really want to know.