MS3: Baro & Temp Data for Toronto

[Fobio]

As discussed in today's Tuning Seminar, we have a reliable resource for weather data in Toronto to apply proper SAE correction to Vitual Dyno plots:

Toronto's past 24 hrs readings (this is a consolidated page with all data)

LINK: Toronto Island Weather over the Last 24 Hours (http://toronto.weatherstats.ca/periods/24hrs.html)

Barometric Pressure Converter [from Kpa to in/Hg]

LINK: Barometric Pressure Converter (http://www.csgnetwork.com/directbarpressureconv.html)

Temperature Converter [C* to F*]

LINK: Temperature Converter (http://www.albireo.ch/temperatureconverter/)

[Mr Wilson]

Thanks Fobio.

[dentinger]

i dont see how Baro and Temp is THAT critical for tuning.
Baro/atmospheric pressue will always be about the same, would it not? you're at sea level in toronto, so you wouldnt see any real difference no?

[MajesticBlueNTO]

i dont see how Baro and Temp is THAT critical for tuning.
Baro/atmospheric pressue will always be about the same, would it not? you're at sea level in toronto, so you wouldnt see any real difference no?

there are some things that people know and there are some things that people don't know.

usually, when people don't know, they don't form a question as if they know the answer then ask for the answer.

[dentinger]

im not familiar with dyno tuning cars (re: not at all)

i know the MAP sensor/BARO sensor/IAT sensor gives pressure/temps inputs, but is it different when tuning?

[Fobio]

im not familiar with dyno tuning cars (re: not at all)

i know the MAP sensor/BARO sensor/IAT sensor gives pressure/temps inputs, but is it different when tuning?

In our Tuning Seminar today, we discussed using Virtual Dyno [a program that turns our datalogs into usable and reliable dyno plots that when appropriate correction factors are used] and how it can be very useful as a tool in gauging our individual tuning progress. And as a tool, you want to increase its accuracy as much as possible, hence the SAE correction factors for all to use here.

The data is to be used for SAE correction. We do not use the data to "tune", but we use the data to apply a standardized Society of Automotive Engineers' "correction factor" due to differences in temperature and barometric pressures to ensure the numbers that are generated from logs are genuine, or as genuine as possible in accordance to a generally accepted standard. In short, it keeps our dyno plots honest, usable between different cars on different days.

And to answer your original question, barometric pressure and its fluctuations DO make observable and enough of a difference. You would have to have played with it to see it tho...

[fywdyl]

The Weather Network website works too if you want to be more specific with the city. You'll have to use the Last 24-hr screen to find baro thou.

[Fobio]

The Weather Network website works too if you want to be more specific with the city. You'll have to use the Last 24-hr screen to find baro thou.

I've tried that too...but I find the info harder to get at...takes longer. The above site has all info on 1-page and it also offers different cities too.

[fywdyl]

I've tried that too...but I find the info harder to get at...takes longer. The above site has all info on 1-page and it also offers different cities too.

Oh sweet, I just noticed that it does. Thanks Fobio!

[boyracer]

Thanks for the links Fobio

[Snotrocket]

should humidex be considered?

[Fobio]

should humidex be considered?

Most dyno's do take that into consideration, but VD doesn't have a spot to input that.

[Snotrocket]

I see. But what about if the temp is 28 degrees but 35 with the humidex you could just put in the 35? Or would that be inaccurate.?.

[Fobio]

I see. But what about if the temp is 28 degrees but 35 with the humidex you could just put in the 35? Or would that be inaccurate.?.

Humidex, like wind chill factor, is just a way to tell ppl how the weather "feels" on the skin. Those do not apply to ambient temp, which is what SAE correction is about.

[Fobio]

For those that use Virtual Dyno, who choose to use a 1.01 correction factor rather than entering baro and temps for SAE correction.

Fact: 1.01 CF is just a quick and dirty way on VD to *APPROXIMATE* SAE correction. These correction factors were also used by guys in higher elevations [read: Colorado, for example] to *APPROXIMATE* sea-level. 1.01 CF on VD is by no means a "standard".