What makes a dyno look like this?

[Likwid]

It looks like shifting, but in all the other dynos I see they are a smooth line

like this

Just curiosity.

[MidgetTodd]

A twichy NOS thumb

[Likwid]

A twichy NOS thumb

hehe, I saw one graph on Brian's page that showed a car with NOS, but who hits the NOS button like that?

[monsterzx6r]

It is shifting from 1st to 4th gear. There are two lines there for your before and after runs.

[MidgetTodd]

hehe, I saw one graph on Brian's page that showed a car with NOS, but who hits the NOS button like that?

someone with torrets

[ReconRat]

Roller shaft bearing repeatedly seizing on the dyno?

Or otherwise intermittent interruption of the power data.

As in some sort of mechanical or electrical failure of the dyno readings.

edit: it does look like it's shifting gears...

Edited July 14, 2009 by ReconRat
stuff

[Likwid]

It is shifting from 1st to 4th gear. There are two lines there for your before and after runs.

Roller shaft bearing repeatedly seizing on the dyno?

Or otherwise intermittent interruption of the power data.

As in some sort of mechanical or electrical failure of the dyno readings.

edit: it does look like it's shifting gears...

But why does it show smooth for some and not smooth for others? How does the 2nd bike go to 105 without any shift points in the Dyno? Or is it Dyno settings? ie, you can have it ignore the brief dip?

[gixxie750]

looks like they are spinning the rear wheel on the shifts?

[Likwid]

looks like they are spinning the rear wheel on the shifts?

OOOOOO

Is that common? I honestly didn't think it was possible to "chirp" the tires on a dyno since the dyno wheel spins too.

Got this off Brian's site, does the quality of Dyno have anything to do with it, on Brian's a big jump doesn't spin it seems.

[ReconRat]

Googled some dyno charts, and the RPM vs Time shifting charts look something like the first chart.

The second chart looks like two pulls in a single gear. Really smoothed data.

The third chart shown looks like two pulls, one with a hit on the NOS?

[Likwid]

The second chart looks like two pulls in a single gear. Really smoothed data.

So do you START in 5th gear and just rev it? (Obviously you can't get to 105 MPH in 1st gear) (it's a cruiser btw, not a super bike)

And yes, last chart is with NOS, but looks like 1 gear as you mentioned before, start in high gear, rev it to redline then hit NOS?

[ReconRat]

Where's Brian when we need him, or Schmuckingham. I don't know which gear they pull in for a single gear. But that's what it looked like at the Dyno days. It sounded like they upshifted a few times, and then pulled in a single gear from a low RPM to create the data.

[dustinsn3485]

The first graph is a 1st through 5th gear run.

The second is a 4th gear run.

4th gear is used for tuning purposes because it's closest to a 1:1 ratio.

Each graph shows two separate pulls.

[Likwid]

The first graph is a 1st through 5th gear run.

The second is a 4th gear run.

4th gear is used for tuning purposes because it's closest to a 1:1 ratio.

Each graph shows two separate pulls.

That would explain starting at 20. Thanks for the answers guys, this has been bugging me and I was curious to know!

[monsterzx6r]

Usually you only do a dyno run in 4th gear. The second bike dyno run is in 4th gear only.