Actual Dyno numbers

[mulot30th]

 

[HAMMER]

So was the ME used 85% or 100% ??? What if your operator/system used 100% and DynoTech used 85% ??? More variables. Same day...Same dyno is really the only way to even get close for comparisons sake.

SAE (Society of Automotive Engineers) USA. Power is corrected to reference conditions of 29.23 InHg of dry air and 77F. 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 of dry air and 60F. 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.

 

[mulot30th]

So was the ME used 85% or 100% ??? What if your operator/system used 100% and DynoTech used 85% ??? More variables. Same day...Same dyno is really the only way to even get close for comparisons sake.

SAE (Society of Automotive Engineers) USA. Power is corrected to reference conditions of 29.23 InHg of dry air and 77F. 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 of dry air and 60F. 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.

I have absolutely NO idea about that one..

But from what I've read in many places over the net, a 4% difference is for real between a STD and SAE corrected dyno

 

[HAMMER]

Another variable is the weather information input to the "correction factor". A local guy here with a dynomite system does not have a calibrated weather station for his system so he uses the local weather report, but it is measured at a station 10-miles away, and he inputs that report into the "correction factor". Not exactly accurate. A high-end weather station that is calibrated regularly by the manufacture or a by a metrology center and designed to feed its information into the dyno during the run would be the only way to input accurate information to the "correction factor". Again...more variables. So to say just add 4-5% to my numbers really doesn't mean all that much. The are soooo many things that could make anyone’s numbers different. The only numbers you can compare yours with are the ones form the same dyno and comparing those would only be accurate if you removed every single possible variable. Bottom line is, they are just numbers. Real-world, putting the power to the ground, is all that really matters. I've never had my sled dynoed but she gets-r-done on the hill and that's what counts !!!

 

[mulot30th]

Another variable is the weather information input to the "correction factor". A local guy here with a dynomite system does not have a calibrated weather station for his system so he uses the local weather report, but it is measured at a station 10-miles away, and he inputs that report into the "correction factor". Not exactly accurate. A high-end weather station that is calibrated regularly by the manufacture or a by a metrology center and designed to feed its information into the dyno during the run would be the only way to input accurate information to the "correction factor". Again...more variables. So to say just add 4-5% to my numbers really doesn't mean all that much. The are soooo many things that could make anyone’s numbers different. The only numbers you can compare yours with are the ones form the same dyno and comparing those would only be accurate if you removed every single possible variable. Bottom line is, they are just numbers. Real-world, putting the power to the ground, is all that really matters. I've never had my sled dynoed but she gets-r-done on the hill and that's what counts !!!

Local place I dyno has his own dynomite weather station which is accurate.

And by the way, I have put 156hp at my rx1 mountain track

 

[HAMMER]

Again...they're just numbers.

My point was actual performance always tells the truth !!! A dyno is just a tool. It’s good for telling you if you're gaining or losing hp from an established baseline.

 

[jhlarsen]

here is my dyno sheet

20lbs boost

Sweet numbers, give us some more details on your setup. I've run up to 22 lbs. on an Alpine Apex but I haven't been able to dyno it.

The motor got a ported head, mod stock rods, mod wiseco 10:1 pistons now 9:1, my own disignd intercooler made by mcx, mod TL04-16 turbo.
it's a rear turbo kit. i will move the turbo up front this winter and put on a DTA P8 PRO engine management system

 

[jhlarsen]

Juste one simple question....


Does you dyno sheets use STD or SAE correction?

We use the SAE. Same as you do!

 

[mulot30th]

great numbers

 

[rxrider]

jhlarsen - sounds like you're gonna drag race your sled this winter, are you? Nice mod mod-sled you're gonna get when work is done. What header design are you going with, mid-mount or front-mount?

 

[jhlarsen]

jhlarsen - sounds like you're gonna drag race your sled this winter, are you? Nice mod mod-sled you're gonna get when work is done. What header design are you going with, mid-mount or front-mount?

Don't have the time to dragrace this winter, but maybe next winter
This winter i'm working on a mid mount, it will be great when i get i ready In the mean time i vil ride a two smoke hehe
It's a old thunder, but i will test out a 1240 big bore in it, if i have the time.

 

[rxrider]

Good luck on your build.

No motor mods for me this season, only going to rise boost level to 18 lbs to get into the 300 HP trail riding club LOL. My mods this year are in the suspension department, front and rear. Front Fox floats, rear ZX2.