07-30-2023, 01:43 AM | #1 |
Enlisted Member
11
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
Wavy high RPM n55 powerband
Hi all, just wondering if any of you have experienced something similar on your FBO N55s.
https://www.bootmod3.net/log?id=63e9...90c65a9d948110 North of 6,000RPM my car feels very pulsey and wavey. As soon as I shift to the next gear the pulsation is gone. Seems to be relating to my wastegate freaking out maybe? Maybe the stock turbo is just being maxed out? Either way, looking for suggestions. Thanks. |
07-30-2023, 03:21 AM | #2 |
Private First Class
94
Rep 184
Posts |
The wastegate is consistent at 88% so that's not it. You have a lot of timing corrections. You should check your plugs and maybe add 2 gals of e85 to see if it clears up.
__________________
VRSF RACE IC, FTP CP, VRSF CATLESS DP, BORLA ATAK CATBACK, CTS TURBO INTAKE, MST V2 INLET, PURE STAGE 2, TURBOSMART BOV,FTP TURBO OUTLET, SPOOL FX180, BM3 ETHANOL ANALYZER, PRECISION RACEWORKS COILS, BM3 STAGE 2+ E30
|
Appreciate
0
|
07-31-2023, 12:55 PM | #3 |
Enlisted Member
11
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
typically I run an E30 tune. I get zero timing corrections when I do that. I still get the pulse-y feel up top though. I can get a log later today and post it after work. The pulse-y feel is pretty independent of what tune I run except for when I limit boost to 14.5 in BM3.
|
Appreciate
0
|
07-31-2023, 01:18 PM | #4 | |
Colonel
2188
Rep 2,684
Posts |
Quote:
That's the map slot data going up and down.
__________________
Bootmod3, CTS Catless DP, B58TU HPFP, XHP, BM3 Flexfuel Kit
|
|
Appreciate
0
|
08-01-2023, 12:48 PM | #5 |
Enlisted Member
11
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
|
Appreciate
0
|
08-08-2023, 02:58 PM | #6 |
Major General
4464
Rep 7,733
Posts |
The IATs are pretty high at the end, but i dont see how that would make the car feel as you described.
What map specifically was this logged on? Stage 2 E30? with a 14.5 psi boost limit? After 6236 rpm the WGDC is definitely wavy so i would say that is a factor in the car acting the way you described. It sounds like it only happens when you limit boost, is that correct? I would bet that it has to do with WGDC/boost control when you try to limit power. |
Appreciate
0
|
Post Reply |
Bookmarks |
Tags |
f30, fbo, n55 |
|
|