[Fot] AFR vs EGT = brain damage

[Jim]

So...

AFR is short term (potentially) on leaded cars.  Especially good for
dyno/dial in attempts.

EGT is long term.

Or replace AFR sensors on a regular basis?   Is that what I'm hearing from
those that use them?



Cheers,

Jim
Dallas
Spitfire(s) 

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of Tony Drews
Sent: Wednesday, July 29, 2009 8:05 PM
To: toodamnfunky at comcast.net; fot
Subject: Re: [Fot] AFR vs EGT = brain damage

AFR and EGT in my mind are for different purposes.  The EGT is a quick check
that I'm not going to send aluminum out the exhaust, and when the car runs
like crap it, along with my fuel pressure gauge, give me something to help
diagnose the problem.

Fuel pressure = 0 and EGT's go up and then drop means I forgot to put gas in
the fuel cell again.  One EGT lower than the other - front carb or rear carb
problem.  Good fuel pressure and egt's go to zero - I just lost spark.  Etc.

I've used the AFR on the dyno to get the carbs right across the entire rev
range.  Made a ton of difference in power.  Also killed the new sensor over
the course of the dyno session - it was a standard single wire one from the
Napa store....  Wasn't terribly expensive.

- Tony
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