So if my O2 sensors are going bad, that would make it run too rich
and cause some of the rich fuel odor I smell from time to time?
On Jul 5, 2006, at 3:15 PM, Paul Nimz wrote:
> There is no learning for the octane. The knock sensors fire off
> when they
> hear noise and the timing is immediately retarded. The new timing
> numbers
> will automatically be adjusted no matter what or when. Assuming
> you knock
> sensors and the code strategy is up to it.
>
> Now the less btu content of the higher octane will have a small
> change on the
> learned tables by requiring a slightly richer mixture when in
> closed loop.
> But the O2s will adjust to the proper 14.6 AF ratio then start
> saving new
> values to the adaptive tables immediately.
>
> But the WOT tables are fixed and therefore without adjustment you
> get what you
> get. Stock tables are way rich anyway for open loop (on the V8).
>
> I've always gotten a bit better mileage from premium, ~1-2 mpg, but
> cost wise
> it's a draw.
>
> I do see an advantage to using premium when the ambient temp is
> above 80F as
> the timing will stay higher.
>
> Paul
>
>
> On 7/5/2006 12:21:12 PM, Juillerat, Aaron J
> (aaronj@autojectors.com) wrote:
>> Drive like you normally would that is best. The computer will
>> adjust to
>> the optimum performance of the parameters
>> it's faced with. Meaning your
>> car was use to how you drive with premium, then all the sudden you
>> dropped to regular and thus changing a parameter so it needs to learn
>> what to do with the lower octane. You may even want to pull a
>> battery
>> cable off and clear the computer and let it start from scratch.
>>
>> -A.J.
>>
>> -----Original Message-----
>> From: shotimes-admin@autox.team.net
>> [mailto:shotimes-admin@autox.team.net]
>> Sent: Wednesday, July 05, 2006 1:05 PM
>> To: shotimes@autox.team.net
>> Subject: Re: [Shotimes] Poor mileage
>>
>> Is that for the first few tanks, or do I always need to floor it?
>> I'm
>> usually easier on the gas than not.
>>
>> On Jul 5, 2006, at 9:35 AM, Rick Glass wrote:
>>
>>> It will improve after a couple of tanks, the computer adjusts for
>>> stuff like that......just give it more than 1 tank and
>> don't be
>>> afraid to put your foot in it, if you don't get on it, it
>> ain't
>>> gonna run right.
>>>
>>>
>>>
>>> Rick Glass
>>> '99 SF 98k
>> Flowmasters
>> Kirk'd
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