A/F readout delay

[Tom Goldman]

Just looked at my first run here at RT66 , my RacePak O2 is .021 behind RPM

[Marty Buth]

Originally Posted by Tom Goldman

Just looked at my first run here at RT66 , my RacePak O2 is .021 behind RPM

Thanks Tom! Quite interesting what you are seeing. Bob Shaw and Bob Gullett are seeing .2 seconds and you are seeing ,02 seconds. Do you have any logic about why you are seeing so much less delay?

[Tom Goldman]

Marty , possibly because I'm reading 10" from the port as opposed to the collector.
I also have a brand new sensor installed for this race.
I looked at a few runs from last week and they were closer to .014 seconds ,so age can defiantly be a factor.



































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[Marty Buth]

Thanks Tom!

[Ed Wright]

So, Tom, your only looking at one cylinder?
You use a carburetor?

I am not sure why you would choose that, over the round part of the collector, past the transition section.

[Glenn Briglio]

Originally Posted by Ed Wright

So, Tom, your only looking at one cylinder?
You use a carburetor?

I am not sure why you would choose that, over the round part of the collector, past the transition section.

If to close to end of collector it will give you a false reading at speed..........ask me how I know.

[Ed Wright]

Originally Posted by Glenn Briglio

If to close to end of collector it will give you a false reading at speed..........ask me how I know.

At the end of the transition area being too close to the end of the collector = too short collectors. Right where the collector goes round would not be too close to the end on any headers I've ever seen. In the primary tubes only shows you that one cylinder. How darn short are your collectors? 10" or so from the end of the collectors will be OK going down the track WOT. Will show bogus Lean at idle & on the return road due to clean air being sucked back in during cam overlap cycles.