A/F gauge vs. EGT Gauge

[godspeed]

wideband is now so inexpensive these days, you could get them. Try AEM UEGO.

they're fairely simple to install with the plug and play wiring harness with bosch plugs.

They'll give you the a/f ratio in sweeping led and digital layout (for turbo cars that goes under 11).

EGT is great, because you could monitor the temperature of your engine. They give you the right away info on what's going on in your engine. If it goes colder you'll know it's lean, if it's running hotter, you know it's rich... and few other thing, like if your EGT temp goes up, you might have blown an engine... etc.

anyway with both the EGT and A/F you could monitor and tune your car accordingly.

Since you could have the perfect a/f ratio and still have things go bad inside your engine, I think it's good to have EGT to monitor what you're doing is right inside the engine.

my 2 cents

[Jaimecbr900]

EGT is great, because you could monitor the temperature of your engine. They give you the right away info on what's going on in your engine. If it goes colder you'll know it's lean, if it's running hotter, you know it's rich... and few other thing, like if your EGT temp goes up, you might have blown an engine... etc.

You were doing good until this.

It's actually backwards bud. As the EGT temps rise, that shows the engine leaning out. As the EGT temps are lower, that shows an engine being rich. As for EGT temps rising as being indicative of engine condition, that's kinda of assumption rather than monitoring a symptom. In other words, the engine may be blown AFTER the temps climb really high because it was LEAN. But that doesn't necessarily mean that higher EGT temps are indicative of a blown engine. One of the big factors in accuracy of EGTs is the placement of the probe. The optimal location is right into the exh manifold. Sometimes that's not possible, and therefore the further downstream it is the more you have to take that into consideration.

For example, my car is a ULEV vehicle. In order to get there, it requires the car to run leaner than most vehicles, and we're talking about STOCK here. Therefore, my N/A temps are higher than most. My off boost EGT temps are 1200 or more all the time. For most other cars that is very high, for mine it's not. What I look for is for the temps to stay the same WHILE under boost. If I do that, then I'm stoich. If the temps go higher, then I'm leaning and I get out. Follow?

BTW, I will getting the AEM wideband installed in the next few days. This way at a glance I can see the exact A/F w/o having to guess at it.