100WHP by installing an N52 exhaust cam in an N55.
- Thread starter 9krpmrx8
- Start date
Thank you. I'll have to pick this back up tomorrow. Looking forward to your thoughts once I learn the system. I'm out of town currently, but will have more time to dedicate to sharing when I'm back home tomorrow night. Hopefully you can see what you need to with what I shared above. Thanks for all the interest in my project everyone. Completely understand the reactions and look forward to continuing the convo
Hopefully I got the graph numbers right, here is the link directly to all logs and the description I wrote based on the email he sent me:
bmw.spoolstreet.com
N52 Cam on N55
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...
bmw.spoolstreet.com
Thanks dude. Curious to everyone's thoughts. I am extremely excited about this and was taken back from the negativity, but hope this clears the air. Would be honored for a 1st page position.Hopefully I got the graph numbers right, here is the link directly to all logs and the description I wrote based on the email he sent me:
N52 Cam on N55
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...
Ps. Based on what I sent, the N55 and N52 cam charts were on the exact same tune. That was revision 9 with Fabby. The tuned N52 chart was like 5 or so revisions in after the cam swap. Neither were accepted as finished, but were/are damn close. This car saw 52 dyno runs in the past 2 weeks. I have all the charts to prove it. No funny business here.
Obviously you will make more power if timing is advanced significantly... It's 5.7-8 vs. 9-11 for the graphs comparing N55 and N52 cams.
If it really is the same tune than timing was reduced significantly due to knock with the N55 cam. Maybe the difference is the amount of meth being injected?
If it really is the same tune than timing was reduced significantly due to knock with the N55 cam. Maybe the difference is the amount of meth being injected?
That's what I saw as well at 5500 RPM. I saw about a 4-5* timing difference at that RPM although boost is the same.
The tune did not change comparing the first two. I am 99% sure I got the graphs right, but am working from my cell phone and pulling logs from multiple thread emails, so it's worth double checking from my PC. Again though, i would bet large money I got it right. I would love for Fabby to chime in, but I doubt he has time for all the back and forth. We shall see.
Also the giant throttle closure in the N55 log... There is the "big dip" that the N52 cam "fixed."
If anything, the n55 log has *smaller* timing corrections. Plus that throttle closure in the first log. The tune version is in the datalog, I suppose that could be faked but this still seems more like ignorance than malice.
IATs are like 23F higher in the N55 log than the tuned n52 cam log, that can make a big difference too... Could be the meth, or he just did a ran after a cool-off later in the day. Still. Clearly big variables here besides the cam.
What I know from tuning the N54 is that the same tune will target same timings more or less. The different IATs should not cause such a big difference. So why is timing several degrees lower in the N55 log if it is not due to corrections?
Wonder if logging actual corrections is not a thing with the N55?
Ok... corrections are in the logs... parameters are just not sorted alphabetically...
Left is N52 cam. Right is N55 cam. Fyi.
Attachments
I'm not sure what this is trying to show. Maybe it is me, but the pictures look like the caliper is not touching the cam on the right side and is not on the lobe on the left side. Do you have a part number from the N52 cam?
It's possible CobraMarty calculated wrong. Either way, it's also possible that the cam did next to nothing since OP's dynos are right in line with every other PS2 running 22psi.
