this printout came with the car, it means nothing to me at the point, someone able to point out the important things it shows?

http://imageshack.us/photo/my-images...llingroad.jpg/

also, whats a "powertech induction" when its at home?

 

thats not right, 270bhp at the flywheel and 160 at the wheels?? the drop is too much as it should only be around 70 drop,.

 

its a power graph telling what you what bhp/power your cars producing ect and a powertech induction is a aftermarket air filter/induction kit

 

addi: what does that mean and is there a likely cause of it not being as you're expecting?

 

its nearly 180 at the wheels

 

wheel power is 163.1bhp acording to the power data chart on that picture,

 

i dont think your car is at fault here as i think the dyno has got the figuers wrong or it has not been strapped down right as the differance between the wheel bhp and flywheel bhp should be around 70 at those power levels and yours is at 100 ish, take it for another power run m8 on another dyno, all your plots look nice and smooth so dont worry

 

so it is m8 thats graphs all to ****

 

bad graph m8, as said id take it on another dyno

 

Seeing that the RR run was done back in 2008 it probably bears no resemblance to what its putting out at the mo.


http://www.europerformance.co.uk/pag...sub_category=1

 

i'll take it for another run, sometime in the new year though. spent far too much in the month i've had the car

in layman's terms, what do the actual lines mean though? i've noticed that in 1st there isn't much pull even at about 4k and only really starts pulling at and above 2nd gear, how does that relate (at all?) to the graph?

 

I've seen quoted else where that 21.8% losses are the figure to look at...

 

Back to your original question...........

In the UK "most" people quote Engine power rather than Wheel Power so for now ignore the blue line.

The green line shows the mechanical losses (drag) as the car and dyno slow down without power on the engine so can be ignored for now.

Pink line show the actual boost produced (vertical scale 0-1.5bar) at corresponding engine speed (horizontal scale 1000-7000 rpm).

The flat top orange line is the torque curve, with a max torque figure of 261Lb ft at 3655rpm (The more "area under the curve" the better)

The other orange line is the power curve which peaks at 264 BHP at 6160rpm

Powerstation has a Maha dyno, (with Andy Cookson the operator on the day) whereas a lot of rolling roads use Dyno Dynamics dynomometers.

From previous experience the figures from Powerstation (Maha) equate very closely with those produced at Surrey RR (Dyno Dynamics).

In laymans terms........

You'll get most fun by keeping the engine in the 3400-5000 rev band

 

Typically you'd expect the transmission losses to be about 80%. This is showing it to be around 60%. That does seem quite low.

 

i never even knew there were different figures for engine and wheel power!

in my car i have a boost gauge and oddly "0" which is where i'd expect the starting/base point to be is in the middle and it actually starts in the negative numbers, why is that as the boost on the graph goes from a different scale.

good to know, never reaslised that the curve actually drops off after a sweet spot on the rev band.

does that sort of advice apply through all the gears?

 

The difference being power losses in the drivetrain

When driving "off boost" your gauge will read negative as air is "sucked" into the engine and not "blown" into it.

The flatter the torque curve the better

Yep

 

different figures are because power is lost as it passes through the drive train.

boost gauge reads negative because when the you are off boost the engine is sucking in air creating a vacuum in the manifold

 

beat me to it Don. lol.

 

ah okay so when its below 0, its running "off-boost" and now i understand what people mean when they say to drive off-boost nearing the end of their journey actually means (i had just been driving quite slow and letting it idle)

 

The only reason for the "low wheel figures" is because Powerstation run a Maha dyno, which has 2 rollers per wheel doing the measuring (therefore larger measuring patch on the tyres), where most have either 1 roller doing the work, or 2 rollers - one which just rolls, and the other which just measures.

 

Maha? as in.. um eh, um ah, quincy maha

sorry couldnt resist - gold star for first person to guess what im on about!