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Originally Posted by solidONE
another thing that I'd do to try to be more consistent converting logs to Vdyno is look at the RPM's in the logs throughout each pull. If there are any unusual dips or spikes in any part of the pull, I would not use that data for Vdyno. It will read falsely high in most cases. Small dips and spikes in the RPM during a pull indicates wheel slip, even small ones, will cause the converted information to be inaccurate.
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Thank you for your help. I didn't consider minute grip differences could be a factor, but that would make sense. But wouldn't wheel spin cause a lower reading? I mean we measure the time it take to accelerate a certain mass to a certain speed, and if it takes longer to get there it should show an overall lower reading? I understand it may locally bump the curve up where the spinning is taking place
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Also, I noticed you using smoothing factor 3. I generally like to use 2 smoothing. The higher the smoothing factor selected the lower the converted numbers, typically. But I suppose it helps smooth out inconsistencies between pulls.
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Thanks for the tip. I probably went to 3 at some point where I looked at curves that didn't have the best data. I now tried factor 2 and even 1. They both give good curves with pulls that are reasonable, not so much with pulls that are questionable.
It seems I used the worst data and manipulated it wrong in the first post.
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Glad to see someone using this tool correctly, as I've seen people post some pretty wild looking Vdyno pulls on this forum. Pretty much all the ones I've seen on this forum looked horribly wrong besides yours.
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Thanks. I messed up the first ones and it really confused me not to see an improvement. I am going to change the subject to "solved". Thanks for your help!
Here smoothing 1 (just to make me happy).
This is just another confirmation to me to take any actual dyno charts from anyone that is looking to sell anything with a grain of salt.
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Originally Posted by eddieflyinv
Maybe try a stage 2 tune ? There are changes in them specifically to take advantage of losing the catalyic converter, and may give you a bit better result.
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It already is. Stg 2 vs stg 1 vs. stock. That's why I was confused not to see an improvement.