Ho hum

Just be playing with VAGCOM. Done a log of torque vs rpm - and it shows a peak of 328NM at about 2300rpm. Using the torque/power formula that also shows peak bhp of 154bhp at 4100rpm.

I've plotted all the results of 3 logs... please do have a look and tell me what you think.

How reliable is VAGCOM?

My engine is supposed to be detuned to 285NM due to the 5 speed box, with the 6 speeders being 310NM IIRC - maybe mines been flashed at some stage?

Either way, its 100% boggo standard, and I'm very impressed with the smoothness of the graphs! I've turned them into bitmaps so I can show them here.

Here's my vag-com logs.

Car is stock. My torque peaked at 346nm.

Link to stock Fabia vRS at Awesome gti http://www.awesome-gti.co.uk/rollingroad/graph/rr.briskoda_04.11.06/stevens1.jpg

It doesn't sound very accurate! How do you get the power/torque figures out of VAG-COM? I'm assuming the car doesn't have any sensors capable or working it out directly, so it has to rely on some clever maths?

Chris

Dont know how it works but its logs torque.

I too have no idea - hence why I'm asking Chris.

Its not a million miles away either though is it :P

Its not a million miles away either though is it :P

No - mainly because miles is not a unit of power or torque

HTH :P

Chris

For a standard engine, the reciprocating mass is known within fairly close limits, as is the engine speed and rate of change of speed. So are the fuel and air being supplied.

It's therefore possible to derive theoretical flywheel torque and hence power using known (but not that I can remember offhand so don't ask me what they are) equations.

Just to clarify Ken - VAGCOM can't work out power - you have to work that out afterwards.

Just to clarify Ken - VAGCOM can't work out power - you have to work that out afterwards.

Accepted. My point was that, since it can work out torque, it could work out power, as one definition of power is rate of doing work, which is roughly torque * rpsecond * fiddle factor.

Indeed. I think its rpm*lbft/5252 or something.

Nobody else able to comment. :(

As so many people have Vagcom I thought more people would have something to say!

all i thought tom was that as i was reading the thread title another word appeared at the end, Power/torque/Vagcom/Passat/Bothered

just sprang to mind, if them figures are accurate then thats nice adn the curves look decent

Is VAGCom "Open Source"? I don't think it is, but if it is surely someone could have a look at the code and confirm my thought that it's doing sums based on engine speed and fuel flow?