[Fot] AFR vs EGT = brain damage

[toodamnfunky at comcast.net]

Greetings FoT,



B 

I have recently considered a dual air/fuel ratio gauge for the car right up
until I found

out how much the buggers cost. Ibm seeing $ 450.00 and up for a dual A/F

setup. That leads me to an EGT system at less than half the cost.

After some study it seems that an EGT reading is only a relative measurement

and unless the temps at a given moment can be directly compared with the
actual A/F ratio then itbs really only numbers on a gauge. There is
information that will say when you get to a certain EGT your about to melt
pistons but no useful info that says

a given EGT is the perfect AFR.



B 

My question is, how do you folks that are using EGTbs use the data?

I know that we canbt actually compare temps from one car to the next because

of the wide range of minute details that will skew the numbers but in general

what do you get from and EGT.



B 

It seems to me that I would have to have corresponding AFR numbers to match to
the

EGT and that would change with any change whatsoever in ignition timing, spark
plug type/gap, mixture, fuel type and altitude. (Ibm at 5000 feet so that
can happen B  +/- 1000 ft.) I wonbt even get into cam timing or ambient
temps & air density.



B 

I would much prefer a dual AFR but not at the prices Ibm seeing. If anyone
knows

of a dual AFR setup for a more reasonable price, please by all means clue me
in.



B 

Thanks again FoT,

Jim G