Information on Plug Reading?
Information on Plug Reading? I was wondering if you guys have any good web sites, books, or other literature about reading plugs? I have the basics down, but I am always interested in learning more. My buddy who also tunes cars is always with me to help read the plugs when I am spraying but it would be great to be able to do it myself without him watching over my shoulder!
Already have a wideband in the car, running NGK BR7EF @.033, I log every pass with HPtuners, my afr is always good as far as the wideband is concerned, but I still want to read the plugs.
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A class would be sweet, but I'm pretty good at reading up on stuff, and my buddy can fill in the blanks for me if I have any serious questions. Still looking for a book, web page, magazine article, anything with some good info on plug reading.
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TECH Enthusiast
Joined: Apr 2008
Posts: 654
Likes: 0
From: Dickinson, Tx
Useless? Um, if it keeps someone from going all out when they see the A/F mixture way lean and saves their engine I'd call that very useful. Yes tuning it by a pro would keep it safe. But a solenoid getting stuck can happen and reading the plug after this would be useless since the engine would be getting rebuilt. There's plenty of other things that save an engine by having a Wideband.
Just for *****, why does a tuner use one when tuning?
Just for *****, why does a tuner use one when tuning?
Useless? Um, if it keeps someone from going all out when they see the A/F mixture way lean and saves their engine I'd call that very useful. Yes tuning it by a pro would keep it safe. But a solenoid getting stuck can happen and reading the plug after this would be useless since the engine would be getting rebuilt. There's plenty of other things that save an engine by having a Wideband.
Just for *****, why does a tuner use one when tuning?
Just for *****, why does a tuner use one when tuning?
If #7 plug is running at 15.0 A/F and #1 plug is running at 10.0 A/F
then the other 2 are "OK" and your wideband says your at 11.8 A/F so you think your good to go.
Your probably gonna hurt number 1 and 7 both but for different reasons.
Plugs will tell you whats going on and like ^ said A/F just gives you an average.
then the other 2 are "OK" and your wideband says your at 11.8 A/F so you think your good to go.
Your probably gonna hurt number 1 and 7 both but for different reasons.
Plugs will tell you whats going on and like ^ said A/F just gives you an average.
There are a couple different ways that people do this. I get my fuel reading from the base of the porcelin. In order to do this, you'll have to cut the threads away to reveal the base of the porcelin. I don't like to see any fuel with the naked eye. With a single, smaller system, a little fuel would be ok. As far as timing, I like my timing mark to be around half way between the start of the bend of the ground strap, and the tip of the ground strap. Each application will be a little different, as your time slips will tell you what it likes. Hope this makes a little sense.
10 Second Club
Joined: Nov 2002
Posts: 1,471
Likes: 3
From: Berkeley, California
If your distribution is so poor that a wideband is useless then you probably should try dry or direct port. I'm not saying you don't need to read plugs. I just think you shouldn't accept poor distrubution.
Thank you drive thru.