Re: I do 93 every 4th or 5th fillup. - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: I do 93 every 4th or 5th fillup.
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Posted by matsuda [Email] (more from matsuda) on Wed, 28 Sep 2005 17:28:26 Share Post by Email
In Reply to: I do 93 every 4th or 5th fillup., yoeddy, Wed, 28 Sep 2005 08:18:31
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Since the computer learns the octane over multiple trips the 93 every once in a while is probably wasted - even if it just averages the ignition curve then you're teaching it to run on 88 octance which won't show any better than 87 - if it did compensate fast enough between tanks you should notice the difference and it would infuriating to have the car cutting power almost always (humans have learning curves too!) I would stick to one or the other - I had some actual knock between 1600-2000 rpm on unleaded this summer in TX and it wasn't even that hot (top 90's) so I switched to 93, now the guage goes further into the yellow (I put stickers on the dash so I could visually mark the spots since the guage doesn't have markings, and confirmed my inital readings without them)


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