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      02-25-2020, 11:52 PM   #23
m.hlavik@gmail.com
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Quote:
Originally Posted by Alex@Alpine View Post
Quote:
Originally Posted by Redd View Post
The guys in this thread seem to be experiencing something similar - bad knock under 3500 rpm, especially in areas with bad fuel. All are running Alpine tune.

https://www.m3post.com/forums/showthread.php?t=1532390

Sounds like the Alpine tune may be super aggressive. Have you tried pouring in a bottle of octane booster and see if that helps?
If you read further into the thread you have quoted you will see the problem was not knock. Even in the event of bad fuel the car will still pull timing with the motor tune.

In the case of the OP here he can rule out the tune by just simply flashing back to stock and see if he still has the problem.
ok noted. thanks to everybody guys
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      02-26-2020, 06:23 AM   #24
pbonsalb
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I thought the knock went away when the guy in the other thread ran higher octane? I could see the vanos timing changes being related, in that by varying the opening and closing of the valves and overlap, you alter cylinder pressure. Depending on exactly what is being done, it could make predetonation pinging more likely at low rpm when low octane or winter formulation gas is used.

Alex’s suggestion is the simplest for those using his tunes. Flash back to 241E, clear all adaptations and codes, run a tank of gas through the motor and listen for changes.

There was a thread recently on vanos parts breaking. Apparently it is a plastic part not sold separately. Deansbimmer is working on making a replacement part. No idea how common this problem is. I have not seen many posts on vanos issues in the 10 years I have been here but as Alex points out these engines are getting older and the list of problems will be growing.
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      02-26-2020, 08:45 AM   #25
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Octane booster is the easiest and cheapest thing to test before you try other more expensive options.
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      02-27-2020, 02:09 AM   #26
m.hlavik@gmail.com
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Quote:
Originally Posted by Redd View Post
Octane booster is the easiest and cheapest thing to test before you try other more expensive options.
agreed. waiting the booster. but need to fly out. I will give update next week. thank you
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