just like it says..is it good for anything??everyone is like a/f gauge vs egt, but it seems like you need both too work with each other..is there any use for it tuning yer car on thestreet??? i already have an a/f gauge i am gonna hook up.wondering if i should hookup a egt gauge also

 

egt gauge can also be helped in tuning to let you know how rich/lean you are running by the temp of the exhaust gas. try a search and you will probably find alot more info on it

 

Yes, use an EGT gauge and a narrow band (stock sensor) O2, these will
tell you if or when you have a problem.

You cannot 'TUNE' properly with these, you need a REAL wide band O2
to get your A/F ratios right, but you can see if something is wrong....

Jeffrey Atwood

 

the usual egt vs AF battle,
some say one is better and vice versa

i personally opt for AF since its easier to read, and seems to reacts quicker probably cause of the LED's
egt might take longer to react cause the probe cools and heats,

either way, one is pretty much as good as the other, you dont gotta have both, but have one at least
good luck

 

EGT won't really tell you anything other then your piston may be on its way to melting. If you had a proper tune using a 4gas (timing) or even wideband, I wouldn't bother with one. If you are detonating your EGT will drop significantly, but if you are detonating, you aren't tuned.


[Modified by true, 1:43 AM 12/21/2002]

 

huh??? i thought detonation created more heat

 

Incorect information, your EGT raises with detonation.

Rob

 

Sorry Rob, that information is correct, your information is incorrect.


[Modified by true, 1:45 AM 12/21/2002]

 

EGT is great when tuned along with an oxygen sensor. I can look at my a/f with my wideband. and let the EGT tell me about my timing. Too retarded timing will raise your EGT, too much timing and therefore detonation will raise your EGT. Shoot for about 1400-1450 going through the traps.

 

Basically high EGT's is usually a rich condition. What is happening is the fuel is burning in the exhaust manifold and the temp reading is coming from that.

 

Under NORMAL combustion there is a thin layer of air or a/f coating the cumbustion chamber and cylinder walls insulating them from heat. Under ab-normal combustion (detonation), this coating is scoured off of these surfaces under the HUGE pressures spikes that take place. You might say pressure = heat (it does) so where does all the heat go? Simple, your 'bare' piston heads, valve seals and combustion chamber absorb it. The resulting tempurature when released from the chamber is LOWER. The heat IN the cylinder is greater _under_ detonation, but the EGT is cooler. Instead of saying what sounds obvious -- look it up. Leading up TO detonation (running to much timing etc) will bring you closer to the detonation range, but while detonating your EGT is definetly lower.

 

For cruising the more gauges one haves the cooler it looks. For racing, I only pay mind to three gauges- fuel pressure, Air fuel ratio, and Exhaust temp. Rpm (shift) and boost (overboost) are alerted by lights.

 

So under normal conditions, EGT will read high in the fuel mixture is lean? And read low if the fuel mixture is rich?

That whatI thought it did all the time, but I guess detenation causes it to read lower. It doesn't make since why the EGT would be lower. I don't see how the combustion chamber asorb all that heat, it seems the exhaust gases would still be hot.