FYI...a very interesting read about dynos

silvrbill · #1 06-24-2008, 09:05 PM

Check out these links. Makes you wonder about those high hp and torque numbers you see people posting all the time.
http://www.factorypro.com/
http://www.factorypro.com/dyno/true1.html

Colonel Sanders · #2 06-25-2008, 12:55 AM

Just pointing out for the sake of accuracy that the following statement from that website is 100% false.&nbsp\\;\\\\\\; STD is in fact a widely used correction factor.&nbsp\\;\\\\\\; It is NOT synonymous with "actual" or "uncorrected" HP.

"A STD HP shouldn't ever be given to a customer - The customer probably doesn't know that "actual" means "uncorrected" and that the results can't be compared to anybody else's dyno chart - I was just reading some UK dyno operator explaining on a cbr600rr forum that "STD" hp was some sort of recognized "standard"... (April, 2006). It's not a standard hp number - it's the actual amount of power the bike made THAT day with that temp, baro pressure and humidity. You can't compare it with any other day and different atmospheric conditions. Period. It's a pretty useless chart for comparison purposes. The only time anybody gives an "STD" hp chart is if he's trying to make the power look bigger than another test with different atmospheric conditions."

Colonel Sanders · #3 06-25-2008, 01:00 AM

The following are the standards used by the SAE and STD correction factors...

SAE J1349 correction:
29.23 in/hg. (99 kPa)
77 F degree temp
0 percent humidity
85% Mechanical efficency

STD correction:
29.92 in/hg. (103.3 kPa)
60 F degree temp
0 percent humidity
85% Mechanical efficency

STD not a correction?...Yet another urban legend.&nbsp\\;\\\\\\; Sure makes me wonder about the other info on that site.&nbsp\\;\\\\\\; What a glaring bit of misinformation for a supposed expert to give!