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-   -   Weather stations (https://classracer.com/classforum/showthread.php?t=54056)

pbp1 08-05-2014 03:44 PM
Re: Weather stations
 
Quote:
Originally Posted by Jim Kaekel (Post 440614)
I don't mean to intrude, but I imagine that he's referring to the fact that if you run your car on the "rich" side, that you would tend to pick up a bit more in very good conditions and fall-off a bit more when the air is real bad. On the other hand, if you run on the "lean" side, your car won't vary as much.
I completely agree with your first sentence, but if you run on the lean side of the ideal A/F ratio for your engine, you can have the same un-predictability in performance. As a matter of fact, it can even go the wrong way. I had a customer call me about a tuning issue, his complaint was that when he got in good air, his car actually slowed down instead of picking up. I asked him what his target A/F ratio was, he said 13.8:1, because "thats what everyone who is fast runs at".

Ed Wright 08-05-2014 04:29 PM
Re: Weather stations
 
Good grief! 13.8?? I think somebody is surely pulling his leg. LOL

pbp1 08-06-2014 10:56 AM
Re: Weather stations
 
Quote:
Originally Posted by Ed Wright (Post 440630)
Good grief! 13.8?? I think somebody is surely pulling his leg. LOL
Ed, you know the "Monkey See Monkey Do" mentality. For some application, 13.8 may be an ideal ratio, but it was not for this LS1. He refused to change it! He said it was the ECUs fault that his car slowed down in good air. I gave him the old "Garbage in, Garbage out" speech, to no avail! I try to communicate to people that an EFI system is just a tuning tool, it is only as good as the hands and mind that are using it.

Ed Wright 08-06-2014 11:52 AM
Re: Weather stations
 
Quote:
Originally Posted by pbp1 (Post 440730)
Ed, you know the "Monkey See Monkey Do" mentality. For some application, 13.8 may be an ideal ratio, but it was not for this LS1. He refused to change it! He said it was the ECUs fault that his car slowed down in good air. I gave him the old "Garbage in, Garbage out" speech, to no avail! I try to communicate to people that an EFI system is just a tuning tool, it is only as good as the hands and mind that are using it.
I have found that many wide bands, unfortunately, are like flow benches and dynos, as they don't all give the same numbers on the same engine. I have done this a while now, and have never seen anything on my dyno like 13.8-1 on any wide band of mine. I can't imagine him falling for something like that. He needs sharper friends. LOL

Mine always goes down the track quicker when a tad richer than it liked on the dyno.

Paul Merolla 08-07-2014 12:06 PM
Re: Weather stations
 
Quote:
Originally Posted by Ed Wright (Post 440630)
Good grief! 13.8?? I think somebody is surely pulling his leg. LOL
Ed - I know 14.7 is technically ideal, but what would a good range be for a Q-jet SBC stocker?

Ed Wright 08-07-2014 07:36 PM
Re: Weather stations
 
Paul, 14.7-1 is not for wide open power. That is the target A/F ratio for computer controlled cars with cats. That is where the cats are most efficient in most cases. That is for idle and cruise, not WOT.

Most everything I ever worked with has liked between 12.5-1 and 13.2-1. Some depends on the fuel also. C11 likes a little richer. My car likes 12.8-1 with C11. Your results may vary. LOL

Nitro Joe Jackson 08-08-2014 12:00 AM
Re: Weather stations
 
Computech is my favorite , great support group and tell Jay "Nitro Joe sent you"!
and I know a good guy to bail you out if you have computer problems with there weather at the track, lol

Paul Merolla 08-09-2014 08:52 AM
Re: Weather stations
 
Quote:
Originally Posted by Ed Wright (Post 440879)
Paul, 14.7-1 is not for wide open power. That is the target A/F ratio for computer controlled cars with cats. That is where the cats are most efficient in most cases. That is for idle and cruise, not WOT.

Most everything I ever worked with has liked between 12.5-1 and 13.2-1. Some depends on the fuel also. C11 likes a little richer. My car likes 12.8-1 with C11. Your results may vary. LOL
I should've said "stoichiometrically" ideal...thanks for the info.


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