Fuel grade on Exhaust sound

2978386166 · 10-29-2021, 06:14 PM

hi bimmers, just another question on fuel.

I am wondering if the quality or grade of a fuel affects the exhaust sound?

I have heard that some brand's fuel produce more pops and crakles sounds?

Anyone had the experience where one brands fuel of certain grade just make the exhaust sounds better? If so, is there any recommendations?

my vehicle is a 21 x6 m50i

Thank you!

todd92 · 10-30-2021, 08:46 AM

No. Where did you hear this?

Burnt C6 · 10-30-2021, 10:55 AM

If you but low grade fuel from a station with bad tanks and you get water in your tank you will get a lot of pops and crackles. other than that Nope. I actually had an article from BMW on different fuel grades and how in todays computer controlled systems it knows what you are burning and adjust timing and performance accordingly.

2978386166 · 10-30-2021, 03:01 PM

Quote:

Originally Posted by todd92

No. Where did you hear this?

I think on one of the forums, might just be a rumour then i guess

jad03060 · 11-17-2021, 11:16 PM

The timing will change if you start to try lower octane fuel. It may produce extra power if your octane was higher than the recommended, but I don't know how much adjustability there is in the software/hardware combination. The timing could change the exhaust sound, as the valves would be open earlier or later in the combustion process.

10-29-2021, 06:14 PM	#1
2978386166 Enlisted Member 6 Rep 34 Posts Drives: x6m50i Join Date: Oct 2021 Location: BC iTrader: (0)	Fuel grade on Exhaust sound hi bimmers, just another question on fuel. I am wondering if the quality or grade of a fuel affects the exhaust sound? I have heard that some brand's fuel produce more pops and crakles sounds? Anyone had the experience where one brands fuel of certain grade just make the exhaust sounds better? If so, is there any recommendations? my vehicle is a 21 x6 m50i Thank you!
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10-30-2021, 08:46 AM	#2
todd92 Second Lieutenant 171 Rep 254 Posts Drives: 05 ZHP, 19 X5 xDrive40i Join Date: Feb 2014 Location: NJ iTrader: (1)	No. Where did you hear this?
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10-30-2021, 10:55 AM	#3
Burnt C6 First Lieutenant 270 Rep 321 Posts Drives: 2024 X3 M40i Join Date: Sep 2014 Location: Katy Texas iTrader: (0)	If you but low grade fuel from a station with bad tanks and you get water in your tank you will get a lot of pops and crackles. other than that Nope. I actually had an article from BMW on different fuel grades and how in todays computer controlled systems it knows what you are burning and adjust timing and performance accordingly. __________________ 2024 X3 M40i. wife says no Mods since it's aLease.. I see a JB4 tune in the near future. 2014 328i Melbourne Red Sport Line Dinan Dinantronics tune, Dinan Exhaust, Dinan Suspension, H&R Sway bars, 18x9 APEX PS-7 ,AFE CAI, BMW M Performance Brakes Retired
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11-17-2021, 11:16 PM	#5
jad03060 Major General 3636 Rep 7,739 Posts Drives: X5 45e Join Date: Aug 2018 Location: NH iTrader: (0)	The timing will change if you start to try lower octane fuel. It may produce extra power if your octane was higher than the recommended, but I don't know how much adjustability there is in the software/hardware combination. The timing could change the exhaust sound, as the valves would be open earlier or later in the combustion process.
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