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      10-08-2016, 09:37 AM   #1
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Max Octane (US spec) for N55?

I've looked and looked for an answer. Does anyone know the max octane for the stock tune and those tuned with the MPPK?
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      10-10-2016, 10:09 AM   #2
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BMW recommends 91-93
And for MPPK it says 93 recommended
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      10-10-2016, 11:35 PM   #3
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I don't think adding more octane would hurt so you could even run 100 octane with MPPK and I'm sure your car would like it since MPPK is pretty agressive with boost.
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      10-11-2016, 10:36 AM   #4
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Quote:
Originally Posted by slowF32
I don't think adding more octane would hurt so you could even run 100 octane with MPPK and I'm sure your car would like it since MPPK is pretty agressive with boost.
Ya. I have no problem finding the min octane, but it's the max that I'd like to know. I've found comments saying Max is 96(US) on stock tune but nothing definitive.
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      10-13-2016, 11:26 PM   #5
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What difference does it make?
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      10-14-2016, 05:48 AM   #6
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Quote:
Originally Posted by MickAv8r
What difference does it make?
Track days (HPDE) it might make a difference...maybe?
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      10-14-2016, 02:14 PM   #7
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Quote:
Originally Posted by F32Fleet View Post
Track days (HPDE) it might make a difference...maybe?
Not really. The "upper limit" is the ability of the ECU to utilize the extra octane because its programmed for a range. Unless Im mistaken 96 is from a car rag test where they found an M3 didnt make more power on a stock tune with octane higher than 96. Hence the comments about needing a tune. You can run all the octane you want but you are just pissing money away above a certain threshold.
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      10-14-2016, 02:18 PM   #8
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Quote:
Originally Posted by MickAv8r
Quote:
Originally Posted by F32Fleet View Post
Track days (HPDE) it might make a difference...maybe?
Not really. The "upper limit" is the ability of the ECU to utilize the extra octane because its programmed for a range. Unless Im mistaken 96 is from a car rag test where they found an M3 didnt make more power on a stock tune with octane higher than 96. Hence the comments about needing a tune. You can run all the octane you want but you are just pissing money away above a certain threshold.
Gotcha. thx.
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      10-16-2016, 08:21 PM   #9
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I prefer the 93 v power since it helps motors not ping and knock as much. coming from a wrx were you need to watch this I could tell difference in gas and the 93 was much better than 91 in my case and Shell v power running the smoothest.
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