All this talk of the "s" running close to 14.7 fuel ratio.....Well i think the "s" actually runs very...very rich ...I've heard as much as 10.5 at some points of the band....people with the vafc change the air fuel ratio alot and still are only running close to 14 a/f ratio. Just though i'd add my two cents. Can someone explain to me the corrilation between octane rating and the air fuel ratio. Higher Octane rating harder to detonate under lean conditions? Just curious! Thanks

 

ItalianBucwheat--i cant go into the chemistry part of it but i do know this, the higher the octain rating the less prone to detonation at all situations, contrary to popular belief, the higher the octain rating the SLOWER the fuel will burn. I will go into more detail about this after i refer to my calss notes and books. I may start a new thread. will be back after i visit the sand man




zzzzzzzzzzzzzzzzz

 

[QUOTE]Originally posted by boiler
[B]

Once a "gear head", always a "gear head".

I've noticed that the word has been getting around lately about our site here. Maybe,

 

[QUOTE]Originally posted by integrale
[B]

Most of you guys are really great here!!!

 

[QUOTE]Originally posted by regalracer1979
[B]you didnt say what year it was, but i know we have been reprogramming quite a few ECM's.

 

I understand if you're tired...everyone can get cranky at those times

You know what I mean though...

 

I don't see your connection between the octane rating and the air/fuel ratio. The octane rating tells you how the gasoline mixture will burn (speed of combustion), essentially. The higher the rating, the slower it burns and is less likely to ping.

I guess what you were wondering was whether the engine is less likely to ping if it were running rich as compared to lean? I don't know the answer to that question.

 

integrale-
I did a little investigating at work today and talked to some other techs. the only thing i could tell you would be to switch gas brands. I checked the computer and I didnt find and TSB's or recalls for your car. Your best bet is to let the dealer take a peek. When you do, be very descriptive about when it does it. the better detail we have to start with the better chance we have to fix it the first time.

 

The last 2 cars I had, I made the mistake of getting an "unfamiliar" brand of gas. Those cars ran very poorly as soon as the fuel got to the injectors. In both cases, I put in a bottle of 104 Octane boost and the problem went away almost as soon as the boost got mixed into the fuel properly. This was how I could tell is it was bad gas or something else wrong with the car.
CAUTION: Check to make sure you car will tolerate Octane boost. Not all cars are supposed to be able to take it.

 

[QUOTE]Originally posted by regalracer1979
[B]integrale-