And that explains their error. A Dyno Dynamics dyno typically reports the lowest whp reading of any dyno, which means it will create the largest difference between whp vs. bhp measured by an engine dyno. This results in an inflated percentage of calculated loss.

This is but one more example of why one cannot arbitrarily assign some inflated percentage to drivetrain losses. It doesn't work.

Want to know what kind of power you're really making? Take it to the track and determine the power going to the ground. That is the only power that really matters.

 

Wow this is still not done yet

The numbers are all running through a calculation... it will never be accurate. There are way too many variables. Dynos are made to compare results on the same dyno. They should never be used to compare to another dyno because they just simply will never be the same.

On top of that for the discussion about the drivetrain loss.... think of everything.... not only the actual gears, viscous couplings, wheels, etc but even the fluid. Im sure most people know how thick 80-90 weight is. Now imagine if you put 5w-20 oil in there instead.... you will make much more power to ground even though the motor makes the same. Or dyno it with the 80-90 extremely cold... then warm it up. You can see how many small differences would make the percentage change dramatically. If you want a generic number I think you got it. If you want a specific number... pull your motor.

 

my thoughts exactly. the DD dyno in AZ uses a drivetrain loss of 37%. everybody's car has low #'s there but a dyno is merely a "ballpark" figure of what a car is capable of...

 

I'm sure it makes the naive feel good to know their 16Gs are whipping out 500+ bhp . . .

 

Well, I did not list all the mods I have because of time factor. I really dont know on ur mods because the fact is that the fuel octane levels differ from one contry to another. In my contry for example it is 99 so you could have higher boost levels.

 

My thoughts exactly. It always makes me feel great when my pos that never runs right can still kill these "600+ hp" cars. Funniest part is when I tell them I assume the car only makes around 450 at the time.

 

This is like one of thoughs trick questions that has multiple answers. WOW.

 

True, because there is no static answer. The correct numerical answer is always changing depending on the power output of the engine, the rate of acceleration of the drivetrain, and the speed of the drivetrain at any single moment in time.

 

to be honest there are just roo many varibles to correctly calculate it. i mean someones evo could have the same hp as someones elses but one of the drivetrains could have more friction and more wear.

 

Simon Norris has an engine dyno and when the engine was fitted and tested on a DD dyno is was 24% down on the fly figure. US dyno's read very high though so you might find it isn't even 20% on some dynos.

 

Read post #31.

 

HMMM ok

 

Evo 8 Aus spec

Stock 195 kW @ flywheel factory spec

Stock 145-150kW @ wheels average on most dynos here.

aprx 24% drivetrain losses

this is fairly consistent in my country.

 

That figure is typical for a stock EVO using Dyno Dynamics (Australian made) dyno, not because it is actually 24%, but because that particular dyno gives VERY LOW whp numbers. This makes the drivetrain losses appear EXCESSIVELY LARGE.

Once again, go back and read post #31.

 

was just stating proven test results over here. which shows a 24% loss. whether it is or not i couldnt give a #$*&. Its whats at the wheels that counts.