09-20-2012, 11:18 AM | #1 |
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Lurching Fixed- Wasn't Software Update
So despite multiple software flashes at BMW service (Including the 'lurching update') I still had brutal lurching on my '11 X3 35i.
I was about to drive it into the river. Then my wife decided to try putting in 93 octane Chevron gas instead of just 91. Wouldn't you know it, the lurching is 100% GONE. So, as usual the answer is just fixed by spending more money Thought this might be helpful if some of you were still experiencing lurching after the software updates. Power is also WAY higher. |
09-20-2012, 11:31 AM | #3 |
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doesnt it say premium gas unleaded on gas door?
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09-20-2012, 12:45 PM | #4 |
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nop, it says MINIMUM 89 octane.
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09-20-2012, 02:05 PM | #6 |
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In Canada, the 35i says use 91 octane (which is considered "premium" gas here). 87 is considered "regular".
So 93 octane that I'm saying helps with the lurching would be above the spec of 91 BMW says the turbo needs. |
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09-20-2012, 02:09 PM | #7 |
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Maybe my Canadian car is unique.
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09-20-2012, 03:20 PM | #10 |
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PetroCanada now sell 94 octane in Calgary at several locations. However, any PetroCanada that carries the 94 octane now has up-to 10% ethanol in all grades (like Husky). Higher Octane number but the fuel has lower energy content due to the ethanol.
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09-20-2012, 03:24 PM | #11 |
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No wonder when I tried Husky 94 it didn't have the kick at higher RPM. I used to put 94 in the 325 and I can feel a difference.
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09-20-2012, 06:17 PM | #12 |
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Higher octane just means the fuel is less susceptible to predetonation.
Just like epiphone3 said some of the highest octane fuels contain ethanol to prevent predetonation. I use the lowest grade fuel on my motorcycle. and aim for 91 octane for the car.
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09-20-2012, 06:52 PM | #14 |
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09-20-2012, 07:33 PM | #15 |
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Mine also show what lbjgh picture shows on my 2013 35i M-Sport. I kept filling in 91 from Esso Canada. But starting to wander if its possible to just use 89. Not really keen on trying though.
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09-21-2012, 08:13 AM | #16 | |
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My 2 cents is as follows: for the miniscule differnce in cost per tank of fuel between 89 and 91, why take on all the risk that comes with running the lower grade fuel. Fuel's cheap, pistons are expensive. |
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09-21-2012, 08:25 AM | #17 |
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i always put premium gas BP or Sunoco 91 or 93
i think sunoco offers 93 bp offers 91 not sure though |
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09-21-2012, 01:00 PM | #18 |
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09-21-2012, 01:36 PM | #19 |
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Probably because you are pumping ethanol into your car which has less energy.
This is a good read: http://www.thestar.com/wheels/articl...rmance-engines
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09-27-2012, 02:02 PM | #21 |
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I wonder if vehicles on the left coast are labelled differently due to the possibly that the car will be operated at higher altitudes??
Anyway, below is the info from the manual.
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Last edited by lbjgh; 09-28-2012 at 10:51 AM.. |
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09-28-2012, 12:27 AM | #22 | |
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So is the lurching for that matter. If the lurching stopped its because you are driving more aggressively. |
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