01-24-2024, 12:28 AM | #1 |
Enlisted Member
10
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
Vibrations under load mixed with timing corrections
Hi all, as per the title suggests, I'm seeing some weird behavior with the timing of my car on an E30 map and not really sure what to make of it. Also the car has a very strange vibration under load, can't tell what that is either. However, please see the logs below for the timing corrections. (All three logs were taken about 5 minutes apart from each other)
First log is clean: https://www.bootmod3.net/log?id=65b0...6e2a22a732df6b Second log has some corrections on 2: https://www.bootmod3.net/log?id=65b0...54c076401e3089 and the last log has corrections on 3 that go almost to 6: https://www.bootmod3.net/log?id=65b0...54c076401e30a6 I'm not sure what the problem is for the vibrations or the corrections. Mods: VRSF high flow downpipe, BMS intake, and active autowerke charge pipe and intercooler. |
01-24-2024, 12:08 PM | #2 | |
Private First Class
91
Rep 179
Posts |
Quote:
How are you measuring your e85? You're likely running too much ethanol. Your HPFP is not supplying enough fuel. Its 400-500 PSI below target on every log.
__________________
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
|
01-24-2024, 01:25 PM | #3 |
Major General
4392
Rep 7,634
Posts |
|
Appreciate
0
|
01-24-2024, 03:15 PM | #4 | ||
Enlisted Member
10
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
Quote:
Quote:
Thanks again for the help guys, I do appreciate it |
||
Appreciate
0
|
01-24-2024, 03:43 PM | #5 | |
Major General
4392
Rep 7,634
Posts |
Quote:
If you get misc. and different timing corrections on varying cylinders in different logs its generally normal. If you ALWAYS had high corrections on the same cylinder in multiple logs, that suggests and issue with that cylinder. If you always have timing corrections across multiple cylinders at the same time in several logs, that suggests a fuel quality issue (or something else affecting all cylinders at once). But if its just some corrections here and there and no pattern that is generally normal. https://f30.bimmerpost.com/forums/sh....php?t=1732327 |
|
Appreciate
0
|
01-24-2024, 05:39 PM | #6 | |
Enlisted Member
10
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
Quote:
Gotcha gotcha, yeah typically the timing corrections stay within 1-3 per cyl per pull but occasionally I'll see something spike like that. Glad to hear that's pretty typical though on an OTS tune. I'll try the ACN91 tune with like a gallon of E85 next fill up instead to see if I can get the corrections to zero since this is my daily and I need it to stay somewhat reliable lol |
|
Appreciate
0
|
01-24-2024, 05:51 PM | #7 | |
Major General
4392
Rep 7,634
Posts |
Quote:
I would do that over going to the 91 map. I tried 91 maps for a while with and without E85 and CA fuel quality is just terrible so i could never get good timing and the car made WAY less power on 91 maps. Also, dont pursue zero timing corrections. You'll basically never get there with CA 91 fuel and its not a necessary thing. |
|
Appreciate
1
Shatteredpixelz9.50 |
01-24-2024, 05:55 PM | #8 | |
Private First Class
91
Rep 179
Posts |
Quote:
__________________
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
1
Shatteredpixelz9.50 |
01-24-2024, 07:05 PM | #9 | |
Major General
4392
Rep 7,634
Posts |
Quote:
Pearson fuels in Calif gives me 85% within whatever margin of error you consider for the test kits |
|
Appreciate
0
|
01-24-2024, 08:27 PM | #10 | |
Private First Class
91
Rep 179
Posts |
Quote:
__________________
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
|
01-25-2024, 01:35 AM | #11 | |
Enlisted Member
10
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
Quote:
|
|
Appreciate
0
|
01-25-2024, 01:36 AM | #12 |
Enlisted Member
10
Rep 33
Posts
Drives: BMW 435i F36 xDrive
Join Date: Aug 2022
Location: San Jose, CA
|
The end goal is hpfp + flex fuel sensor, but given I'm in California the thought of swapping my hpfp every other year sounds heinous. If mine goes out I'll probably swap in a b58 gen 1 pump.
|
Appreciate
0
|
01-25-2024, 12:04 PM | #13 |
Private First Class
91
Rep 179
Posts |
I'm in CA too. Its really not that bad if you're comfortable working on cars. I got my car smog ready in a couple of hours. Once for a state ref and again for smog.
__________________
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
1
Shatteredpixelz9.50 |
01-25-2024, 01:12 PM | #14 | |
Major General
4392
Rep 7,634
Posts |
Quote:
- Excessive could be consistent, repeated timing corrections on ALL cylinders in multiple different logs. They could be relatively small (2-3 deg), but if its always happening on all cylinders could mean fuel octane isnt enough - Excessive could also be consistent, repeated timing corrections on the same cylinder(s) in multiple different logs. In this case suggests an issue with that cylinder(s) So if one cylinder randomly spikes to -6 in a log i wouldnt really worry about that. Could be a fluke. Every once in a while i consider doing HPFP and whatnot but i eventually convince myself its not worth the hassle to have to swap every 2 years so i keep the car FBO with stock HPFP. Maybe in 2025 after i smog again ill consider it. I also toy with other ideas every once in a while like meth or the Fogr that you can disable and run on stock tune. |
|
Appreciate
1
Shatteredpixelz9.50 |
Post Reply |
Bookmarks |
|
|