Dave,
What I think you get from TC when used around the exhaust ports is relative
consistency between cylinders.....you gotta have the cylinders run even to
get the most out of the engine. If the TC are calibrated correctly and are
consistent among themselves, then you have a chance for more successful
tuning......but then you could "read" the plugs......
Skip (Data recorder's too expensive for my budget.....@#$%^&*()+@)
At 07:28 AM 5/11/03 -0400, Dave Dahlgren wrote:
>http://www.analog.com/Analog_Root/productPage/productHome/0,,AD595,00.html
>
>As far as i know this link is for the chips used in the Quickdata amps and
>would
>suspect that they are copy of the app notes suggested application circuit. The
>first thing that has become obvious is the temp ratting of the chips.. Max 50
>degree C I think that they don't belong under the hood might be the first
>thing.
>The other thing is if you look at the Vout table of the device it is not the
>curve that Edelbrock uses although it is close. It does show the non linearity
>of the device though so might be a good source of info as to starting a
>calibration. Although it does not take the thermocouple it self into
>consideration.
>
>I do have a couple of questions about the use of these though. How much
>information do you think you are going to get from the TC data as far as
>tune up
>goes. I have used them for years and know what they will and won't tell me
>about
>the tune-up. What does everyone else think they are going to learn by using
>them. A why you think it might help as well. If you think you are going to
>get a
>rich/lean type info from them you are sadly mistaken... Think about the
>combustion process a little bit before you dispute this as it relates to an IC
>engine and where you are measuring and what is actually going on at that point
>in the system and what might affect it as well. How big a change in EGT temps
>would you consider significant? If they are too high or low what do you
propose
>to change in the tune up as well??
>Dave Dahlgren
>
>Russel Mack wrote:
>>
>> Neil:
>>
>> Everybody (except for Mayf and John) seems to have gotten the wrong idea
>> about what my concern is. Extreme absolute accuracy (either lack of bias,
>> or great precision) is probably of little benefit in LSR. What I'm
>> concerned about is REPEATABILITY, reliability of the data-- especially if
>> you need to change one or more components in the system.
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