White spark plugs - AFR seem ok?
Hi everyone,
I'm running ~15.5 AFR at cruise and something like 12.0 AFR at 120mpa and 11.5 AFR above up to 200mpa which is my max boost target. running a stock 1.6 with FF640cc injectors, BKR7E plugs, MSpnp2, LS coils. The car pulls and runs great but when I pull the plugs out they have a lot of white deposits and look scarily lean. However, according to my wideband (new AEM) the AFR is running pretty safe under load. Is this normal for a turbo'd engine? I went out and did a WOT pull in 4th gear and immediately turned the car off pulled over and pulled the plugs. They had a bit more of a brown tint but hardly any darker in color. Not the golden brown that I am used to tuning to on my ancient carb'd motorcycles. https://cimg9.ibsrv.net/gimg/www.mia...03a1dee24b.png Thanks, Nick |
Looks nice to me. Don't change a thing.
That golden color comes with the normal burning of a little oil over time so it varies by consumption. Additives can make it more pronounced. |
I also believe that unleaded gas does not color plugs like we were taught, (at least old guys like me), with leaded gas. Been awhile since I tuned any carbs, but damn, it made more sense to me than CAN/BUS, or laptop fiddling, etc. I'm still looking for that nice, dry brown look.
|
Alright, i'll send it. Thanks for the responses guys.
|
All times are GMT -4. The time now is 02:24 PM. |
© 2024 MH Sub I, LLC dba Internet Brands