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Re: [Fot] EGT; the true need?

To: scypher@usa.com,<fot@autox.team.net>
Subject: Re: [Fot] EGT; the true need?
From: Tony Drews <tony@tonydrews.com>
Date: Fri, 12 Jan 2007 23:34:39 -0600
I have dual gauges (two carbs).  I use them to help determine why my 
car isn't running right and to get a rough estimate of if I'm running 
to rich or too lean.  The fuel pressure gauge is the other problem 
determination tool.  When the car's running right, I ignore them 
pretty much.  But, when it's NOT running right, it's a valuable 
problem determination tool.  Considering what we spend per track 
session, saving a session or two by figuring out the problem quickly 
more than pays for the install.

 From what I understand, the A/F sensors don't like leaded gas.  The 
chassis dyno has an A/F sensor and it's very valuable to help tune 
the car.  When you see one EGT needle go up and then down, you know a 
carb has run out of gas for some reason.  If you see both go down, 
and the fuel pressure goes up, you know the regulator's having issues 
and is dumping gas through the carbs.  If both EGT's go down but the 
fuel pressure stays correct, you've got an ignition issue.

- Tony

At 08:53 PM 1/12/2007, Scott Cypher wrote:
>I've seen several racers with EGT gauges on their cars.  Some have singles,
>some have doubles (and they tend to have 2 carbs).  I'm trying to decide
>what I will need to do on the spitfire (1 ZS150), and the TR6 (triple
>webers), if anything.
>
>I've already got an A/F ratio on the spit, but haven't done any mods to the
>TR6 yet.
>
>
>
>Can someone help me understand what is the true need for an EGT, and what do
>those that have them watch for?
>
>
>
>Thanks
>
>-Scott
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