Reprogram the computer?
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Joined: Aug 2006
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From: Traveling across America
2006 c230
Reprogram the computer?
After reading through the gasoline thread below i have a question. Previously the highest Octaine i could use was 91. I just moved and found that 93 is the highest. Reading in this thread people are talking about having their computers changed to reflect the different octaine reading. Why is that necessary and what will happen if the computer isnt told that the engine is receiving 93 octaine. Premium is Premium no? as far as the computer is concerned?
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Joined: Aug 2002
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From: Massachusetts
C240 2002
After reading through the gasoline thread below i have a question. Previously the highest Octaine i could use was 91. I just moved and found that 93 is the highest. Reading in this thread people are talking about having their computers changed to reflect the different octaine reading. Why is that necessary and what will happen if the computer isnt told that the engine is receiving 93 octaine. Premium is Premium no? as far as the computer is concerned?
I believe the requirement is "at least 91 octain" so running your car on 93 octain shouldn't hurt anything. I've been running my C240 for four years on 93 octain, and everything works fine!
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'10 GLK350 4matic/ '05 BMW e46/'20 F-150 3.5L Ecoboost
As far as I understand it, the reason you would update the ECU to 93 is so your car can take advantage of the additional octane. Otherwise, you would get no change in performance, since the car is set for 91 at the factory. The 2 additional octane will not make any difference in normal driving, however, under heavy acceleration or top speed (racing) it should help (maybe in the tenths of a second).
In the same manner, using 87 octane, under normal driving conditions you probably won't notice much of a difference, other than poorer gas mileage. However, you would notice slower acceleration compared to running 91.
In the same manner, using 87 octane, under normal driving conditions you probably won't notice much of a difference, other than poorer gas mileage. However, you would notice slower acceleration compared to running 91.
Thread Starter
Member
Joined: Aug 2006
Posts: 82
Likes: 0
From: Traveling across America
2006 c230
As far as I understand it, the reason you would update the ECU to 93 is so your car can take advantage of the additional octane. Otherwise, you would get no change in performance, since the car is set for 91 at the factory. The 2 additional octane will not make any difference in normal driving, however, under heavy acceleration or top speed (racing) it should help (maybe in the tenths of a second).
In the same manner, using 87 octane, under normal driving conditions you probably won't notice much of a difference, other than poorer gas mileage. However, you would notice slower acceleration compared to running 91.
In the same manner, using 87 octane, under normal driving conditions you probably won't notice much of a difference, other than poorer gas mileage. However, you would notice slower acceleration compared to running 91.
