Low octane, stock consequences
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From: The empire state
Low octane, stock consequences
Hey guys I tried searching about this but found posts related to really tuned cars. My question is what would be some potential problems of a stock evolution running say 91 or even 89 octane fuel. And im thinking just driving day to say without really hitting hard on boost, if at all. Im sure youre like "wtf why would you do that". But really, what would happen, low to no boost on 89-91 octane(simply for the price/availability)??
Last edited by getcha; Nov 24, 2008 at 08:59 PM.
funny that you ask that today.
I had some bad gas pumped into my car. (87 oct)
When driven off boost there was no ill affect, this is confirmed by my mitsulogs I have pulled while driving to work (city and interstate driving).
Now you will not be able to boost as you will have detonation.
Does that help?
I had some bad gas pumped into my car. (87 oct)
When driven off boost there was no ill affect, this is confirmed by my mitsulogs I have pulled while driving to work (city and interstate driving).
Now you will not be able to boost as you will have detonation.
Does that help?
Our cars come from the factory tuned for 91 octane. 89 should be sufficient when cruising off boost BUT keep in mind 93 octane not only gives you more power(when tuned for it)/safety but also burns slower.
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From: The empire state
Yea it def helps, I knew there would be detonation but I wasnt sure otherwise. I just figured if I was gonna be puttin around town why spend the extra at the time. I just wasnt sure otherwise. Also I was thinking, like what happened with others, if there wasnt any 93 offered at the particular station or place you were at what would I do
and actually is there any detriment to running 93 when they are factory tuned for 91??
and actually is there any detriment to running 93 when they are factory tuned for 91??
Last edited by getcha; Oct 11, 2007 at 01:31 PM.
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Our cars have High & Low Octane Fuel & Timing Maps..
High Octane is for when you are not knocking (ie., running good gas without detonation) and it uses less fuel and more timing.
Low Octane is for when you are knocking (ie. running bad gas with medium to high detonation) and it uses a lot of fuel and less timing.
Unfortunately, most stock Evos will knock significantly on 91 octane, enough to occassionally push you into the Low Octane maps... this saves you from blowing your engine, so technically the Evo is "designed" to run on 91... however it's really not.
Even on 93, stock cars will OCCASSIONALLY knock, although most likely not so bad as it goes into the Low Octane Maps.
My point? Always use 93, and start datalogging with an OpenPort cable... it's $80 well spent to know what's going on with your engine. If 93 is not available in your area, then plan on getting a custom tune that will reduce knock to safe levels
High Octane is for when you are not knocking (ie., running good gas without detonation) and it uses less fuel and more timing.
Low Octane is for when you are knocking (ie. running bad gas with medium to high detonation) and it uses a lot of fuel and less timing.
Unfortunately, most stock Evos will knock significantly on 91 octane, enough to occassionally push you into the Low Octane maps... this saves you from blowing your engine, so technically the Evo is "designed" to run on 91... however it's really not.
Even on 93, stock cars will OCCASSIONALLY knock, although most likely not so bad as it goes into the Low Octane Maps.
My point? Always use 93, and start datalogging with an OpenPort cable... it's $80 well spent to know what's going on with your engine. If 93 is not available in your area, then plan on getting a custom tune that will reduce knock to safe levels
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