**DYNO SHEETS* and/or *1/4 MILE TICKETS**
#51
09-07-2009, 10:43 AM
-2009 fxdb
-96 inch
-six speed
-hd 20w50
-V&H short shots chrome(standard baffles)
-V&H V02 High flow Intake/Breather
-V&H fuel pak
-91 octane
I am wanting to do cams and maybe change the baffles on my short shots, the dyno guy seems to think my exhaust is robbing power. i amy change to the big radius 2 into 1. but for now its good.
-96 inch
-six speed
-hd 20w50
-V&H short shots chrome(standard baffles)
-V&H V02 High flow Intake/Breather
-V&H fuel pak
-91 octane
I am wanting to do cams and maybe change the baffles on my short shots, the dyno guy seems to think my exhaust is robbing power. i amy change to the big radius 2 into 1. but for now its good.
#52
09-07-2009, 05:16 PM
#53
09-07-2009, 05:23 PM
Also, not sure if it has been addressed in this thread or not but figured I would throw out some info about STD smoothing versus SAE smoothing.
SAE represents more realistic standard conditions, STD artificially boosts numbers. Found this somewhere on the Web:
SAE (Society of Automotive Engineers) USA. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25°C). This SAE standard requires a correction for friction torque. Friction torque can be determined by measurements on special motoring dynamometers (which is only practical in research environments) or can be estimated. When estimates must be used, the SAE standard uses a default Mechanical Efficiency (ME) value of 85%. This is approximately correct at peak torque but not at other engine operating speeds. Some dynamometer systems use the SAE correction factor for atmospheric conditions but do not take mechanical efficiency into consideration at all (i.e. they assume a ME of 100%).
STD or STP. Another power correction standard determined by the SAE. This standard has been stable for a long time and is widely used in the performance industry. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."
Not trying to start any **** but it helps to know the difference in the two when wondering why one bike is getting higher numbers. Could be the difference smoothing used.
SAE represents more realistic standard conditions, STD artificially boosts numbers. Found this somewhere on the Web:
SAE (Society of Automotive Engineers) USA. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25°C). This SAE standard requires a correction for friction torque. Friction torque can be determined by measurements on special motoring dynamometers (which is only practical in research environments) or can be estimated. When estimates must be used, the SAE standard uses a default Mechanical Efficiency (ME) value of 85%. This is approximately correct at peak torque but not at other engine operating speeds. Some dynamometer systems use the SAE correction factor for atmospheric conditions but do not take mechanical efficiency into consideration at all (i.e. they assume a ME of 100%).
STD or STP. Another power correction standard determined by the SAE. This standard has been stable for a long time and is widely used in the performance industry. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."
Not trying to start any **** but it helps to know the difference in the two when wondering why one bike is getting higher numbers. Could be the difference smoothing used.
The following users liked this post:
LLCOOLJ (11-27-2021)
#54
09-07-2009, 05:38 PM
Also, not sure if it has been addressed in this thread or not but figured I would throw out some info about STD smoothing versus SAE smoothing.
SAE represents more realistic standard conditions, STD artificially boosts numbers. Found this somewhere on the Web:
SAE (Society of Automotive Engineers) USA. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25°C). This SAE standard requires a correction for friction torque. Friction torque can be determined by measurements on special motoring dynamometers (which is only practical in research environments) or can be estimated. When estimates must be used, the SAE standard uses a default Mechanical Efficiency (ME) value of 85%. This is approximately correct at peak torque but not at other engine operating speeds. Some dynamometer systems use the SAE correction factor for atmospheric conditions but do not take mechanical efficiency into consideration at all (i.e. they assume a ME of 100%).
STD or STP. Another power correction standard determined by the SAE. This standard has been stable for a long time and is widely used in the performance industry. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."
Not trying to start any **** but it helps to know the difference in the two when wondering why one bike is getting higher numbers. Could be the difference smoothing used.
SAE represents more realistic standard conditions, STD artificially boosts numbers. Found this somewhere on the Web:
SAE (Society of Automotive Engineers) USA. Power is corrected to reference conditions of 29.23 InHg (99 kPa) of dry air and 77 F (25°C). This SAE standard requires a correction for friction torque. Friction torque can be determined by measurements on special motoring dynamometers (which is only practical in research environments) or can be estimated. When estimates must be used, the SAE standard uses a default Mechanical Efficiency (ME) value of 85%. This is approximately correct at peak torque but not at other engine operating speeds. Some dynamometer systems use the SAE correction factor for atmospheric conditions but do not take mechanical efficiency into consideration at all (i.e. they assume a ME of 100%).
STD or STP. Another power correction standard determined by the SAE. This standard has been stable for a long time and is widely used in the performance industry. Power is corrected to reference conditions of 29.92 InHg (103.3 kPa) of dry air and 60 F (15.5°C). Because the reference conditions include higher pressure and cooler air than the SAE standard, these corrected power numbers will always be about 4 % higher than the SAE power numbers. Friction torque is handled in the same way as in the SAE standard."
Not trying to start any **** but it helps to know the difference in the two when wondering why one bike is getting higher numbers. Could be the difference smoothing used.
The following users liked this post:
LLCOOLJ (11-27-2021)
#55
09-07-2009, 05:40 PM
This is before cams and regear at a bikefest.
#59
09-08-2009, 10:16 PM
Road Master
