tooter's manifold adventure...

[cali yaris]

The second set of dyno pulls need to be done under exactly the same conditions as the baseline pulls with the velocity stack and its matching air filter... except for the tooter manifold being the only change.

That's not going to happen unless ambient temperature and humidity are the same, along with other factors. Did you record ambient conditions and engine intake air temps when you did your baseline pulls?

I think everyone should consider that there is a notable margin for error, counted twice -- once for each dyno session.

[tooter]

Originally Posted by cali yaris

That's not going to happen unless ambient temperature and humidity are the same, along with other factors. Did you record ambient conditions and engine intake air temps when you did your baseline pulls?

Yes. They were automatically logged on the chart:

78.46 °F
29.19 in-Hg
Humidity: 45 %

I think everyone should consider that there is a notable margin for error, counted twice -- once for each dyno session.

Since it's been really hot and dry, I'll try to pick an early morning dyno time on a day when the Santa Ana winds aren't blowing.