A\F gauge or EGT?

[turbotouring]

witch one is better for monitoring
potential engine meltdown?
i mean,do i really need EGT if
i know that the engine is running lean
by the A\F gauge????[:I]
i want to play a little whit the boost
so i need to know A\F ratio but is EGT
more important?

thanks in advance

[Culprat]

A\F

[hoopdiewagon]

EGT. An A/F gauge is junk. (unless you are talking about the $400 wideband a/f meters....). A typical (non-wideband) a/f meter will not give you a value but a "range". They are just voltmeters, the o2 sensor sends a higher voltage as the car richens and raises the lights on the meter. They only work under open loop mode (wide open throttle). Unless you are flooring it, the meter is useless because it cycles itself (closed loop) and your ratios will bounce back and forth enough to make you dizzy. Even when you are under WOT, and the light becomes steady, it still does not show you an actual ratio number so you still do not know what you really need to know.

Again, if you were talking about a wideband sensor forget everything I said and go for that! Of course, you need to get a way to tune the car if you want to spend the cash on the wideband.

[ksquared11]

If you have the $400, AEM makes a great wideband gauge. I plan to get one eventually. It can plug into the Psi-Fi PowerPaq and you can tune the engine.

http://www.rpmoutlet.com/aemgauge.htm