Re map of ECU, advance timing and rocket fuel

 

I've got quite a good idea for this thread. Would somebody take a min to explain how these results are gained.


I know its a rolling road but just how does the machine get stats like 'drag', 'torque', etc?


I`m intrigued, I can't be the only one. Are there any sensonrs attached to your car or is it purely the car on a set of rollers and thats it?

 

thats as good as it gets.

 

Me too.

They measured the rear wheel HP using rollers. They also stuck a sensor up the exhast pipe to check fueling emissions.

I would imagine that the rollers would also be able to measure torque.

 

....I'd like the basis for the '4%' ambient correction explained too - what exactly is being 'corrected' and what for

Andy

 

Air Temperature ..... this can make a big difference to the results.

 

Normally the operator would input the air temp directly into the machine, not add a percentage number.

This, and the coastdown losses, are a common way for owners to be duped when using RRs. The first run before any tweaking occurs will be setup correctly, and the 2nd run will either have a wildly different temp or coastdown loss put in, so the power looks higher.

Please be aware that any RR is only any good for comparison between cars on the same day. Don't get too hung up on any of the figures!

 

If anyone wants to read more about this, here's some good articles:
THE DANGERS OF ROLLING ROAD "FLYWHEEL" BHP FIGURES
COASTDOWN LOSSES

oh, and Transmission Losses - The Last Piece Of The Jigsaw

 

Yes, but corrected from what to what? Is measured power corrected to International Standard Atmosphere (ISA), Sea Level Static (SLS) standard day conditions (15Deg C)? When/were intake temperatures recorded? - were they just assumed to be the measured ambient in the room at the time?

If so, where is the inlet air pressure correction and where on the inlet is the temperature measured (for accuracy it would ideally be at the throttle body inlet (i.e. what the engine actually sees including any losses and including intake ram effects).

Humidity can also make a big difference to measured power and there isn't any allowance made for that anywhere either.

Also, what was the repeatability like on the rollers?

Just interested.

Andy

 

[quote name='summary]Steven' date=' you're pathetic and immature.[/QUOTE']


Not very thick skinned if you ask me..

You forgot to mention he is a shortarse