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PostPosted: Tue Oct 12, 2021 7:53 am 
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Supercharged
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If you had to choose 4 out o the 6 cylinders to record data in which ones would you use?


I would Think 1, 2, 4,6, then interpolate that data to assume tuning strategies for 3,5 from data provided from cyl's 2,4?

Is it even a worry if you have ITB's ?

Whaddya Think?

Greg

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PostPosted: Tue Oct 12, 2021 10:07 am 
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Nice question, Greg.

For symmetry, you want 1 from each symmetric pair. So, you could do 1, 2, 3 or 1, 5, 3 and then roll the dice for the last one. Cyl 1 tends to run hottest due to the coolant path, so best to read that one for sure as a worst/hottest case. I would probably pick 6 as the 4th one so I could get a cooler version of cyl 1.

Lou

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PostPosted: Tue Oct 12, 2021 11:34 am 
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Maybe the 4th one after the collector.
Might give a clue if something was too far off with one of the un-monitored cylinders.


EDIT: my aging brain read this as AFR not EGT. So, nevermind...

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Last edited by ProCycle on Tue Oct 12, 2021 8:36 pm, edited 1 time in total.

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PostPosted: Tue Oct 12, 2021 5:49 pm 
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Supercharged

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Can you get 2 extra sensors and plumb all 6?


Then you can figure out which 4 make the most sense...........

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PostPosted: Tue Oct 12, 2021 6:56 pm 
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Supercharged
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I don't think so On the system I was looking at.. its either 4 or 8.

Greg

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PostPosted: Tue Oct 12, 2021 10:43 pm 
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Supercharged

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Only use 4 at a time

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PostPosted: Wed Oct 13, 2021 8:16 am 
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Supercharged
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If I had to do this I would use cylinders 1,3, 5 and 6. #1 for the same reason Lou stated, it's hottest, and it's also the furthest uphill. #3 as it and #4 have the straightest 'look' at a single carburetor, but you probably only need to sample one of them. #5 (or #2) as it's in the middle of a group of 3. #6 as it''s the farthest down hill and has the coldest combustion chamber. This is essentially what you settled on except I chose #5 instead of #2 as plenum manifolds can sometimes run the rear cylinders rich and this setup samples 2/3 of the front and rear.

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PostPosted: Wed Oct 13, 2021 8:41 am 
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Cool, thanks for the insight.

Greg

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PostPosted: Wed Oct 13, 2021 2:23 pm 
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Is this going on the race car Greg? Dat der be addin some weight!! :D

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PostPosted: Wed Oct 13, 2021 3:48 pm 
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Yes and yes. I have more areas to slice and dice that I have not even touched yet.

Greg

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PostPosted: Thu Oct 14, 2021 6:31 am 
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Dart270 wrote:
Nice question, Greg.

For symmetry, you want 1 from each symmetric pair. So, you could do 1, 2, 3 or 1, 5, 3 and then roll the dice for the last one. Cyl 1 tends to run hottest due to the coolant path, so best to read that one for sure as a worst/hottest case. I would probably pick 6 as the 4th one so I could get a cooler version of cyl 1.

Lou


That is how I would handle this if I had to - but any individual cylinder could develop a problem. If I were going for EGT, I'd spring for a system that could watch all the cylinders.

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PostPosted: Thu Oct 14, 2021 6:59 am 
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Is there such a system that would datalog / interface with MS3?

If so I might be swayed to use that one instead of the original stand alone that I was shopping on.


Greg

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PostPosted: Thu Oct 14, 2021 8:09 am 
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Greg Ondayko wrote:
Is there such a system that would datalog / interface with MS3?

If so I might be swayed to use that one instead of the original stand alone that I was shopping on.


Greg

This?
--> https://www.diyautotune.com/product/can-egt-8-channel-thermocouple-interface/

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PostPosted: Thu Oct 14, 2021 9:56 am 
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Yep. Cool. Thanks pc..

I was looking for that.. more channels, better price.


Greg

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PostPosted: Thu Oct 14, 2021 3:34 pm 
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Supercharged

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Use the extra 2 channels..........

One just before the turbo, one after...............

:mrgreen:

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