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Dealer dyno tune

Started by 98fxstc, August 06, 2018, 07:57:46 PM

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98fxstc

Curious about this dyno chart
It is a Dealer tune on a 107 M8 after a cam install
compares the final calibration with the canned map

[attach=0]

I was looking for the Smoothing number in the top right corner
I can't believe how clean and smooth the lines are
the similarity of the lines  ?
Very interested in any comments
Thanks

rigidthumper

Lines are smooth because they're compressed- have them print your chart scaled to 0,120, instead of -60,120, it'll look more normal.
At WOT, they gained 4/4, so it's possible they used a very developed map, built based on previous similar/same builds, that just needed a small amount of tweaking, and lots of verification/adjustment runs through the RPM/TPS scale ( run 5 through run 56 ).
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

rigidthumper

Just for visual reference, here is the same runs, displayed two different ways:
[smg id=3370]
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

98fxstc

Thankyou Robin
I realized the scaling would smooth it out a bit, but still expected to see a few wiggles
I see from your example that is not necessarily true
I had looked at the number of runs
Time between run 5 and run 56 was 1 hour 40 mins (1 every 2 minutes ? )
Owner said his bike had an additional 50 kms (31.25 miles) on the odometer

rigidthumper

If he is using sweep tests, there are at least a dozen different throttle positions to measure/adjust, * 2 cylinders, so 50 runs aren't out of the realm of acceptable.
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

98fxstc

Quote from: rigidthumper on August 07, 2018, 02:48:33 PM
If he is using sweep tests, there are at least a dozen different throttle positions to measure/adjust, * 2 cylinders, so 50 runs aren't out of the realm of acceptable.

Thankyou

Hilly13

It doesn't seem to me that there is enough time to do all those runs and make adjustments, I'm not a tuner though so it's just my uneducated opinion really, results posted are ok, no AFR line, why do people use different layouts for the sheets?
Just because its said don't make it so

Ohio HD

Quote from: rigidthumper on August 07, 2018, 07:56:33 AM
Just for visual reference, here is the same runs, displayed two different ways:
[smg id=3370]

:up:   understand the actual values too, not just the shape.