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Winter RR day @ Motoscope on Saturday 29th January 2011 - 9am arrival please

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chungster:
word is there were some funny/comical/random numbers being thrown out today for the 2.0 TFSI cars!  :surprised:

Boost Leak issues? 

TrickGTI:
As I said today the flywheel hp is silly as the only true way to know is to wap it out and test the engine on it's own...

Janner_Sy:

--- Quote from: PDT on January 29, 2011, 06:34:17 pm ---Exactly, Maha use a coastdown as well.

This is why Dyno Dynamics is such a massive brand and has overtaken every other dyno manufacturer, consistency and repeatable reliable results. The sooner the UK market accepts bhp@wheels the better. Gets rid of all this flywheel power rubbish which is nothing but a guess that the dyno makes (in some cases this guess is accurate, others its not)

--- End quote ---
Am i right in saying that they predict a transmission loss to work out the flywheel figures?  If so is that just generic FWD/RWD/4WD cars, as all gear boxes, brands and models will surely make varied losses

PDT:

--- Quote from: Janner_Sy on January 29, 2011, 06:33:37 pm ---note to myself  dont bother wasting my cash on a Dastek roller lol.  Surely if they are out they should be consistently out with all the cars.  Varied and random figures looks like potential operator issues to me.

@ PDT ive read about the figures on the Clio Renault Sports always under the 172/182/197/200 point on the clio forums.  Its widely accepted on them.  which makes them even more impressive IMO.  

--- End quote ---


Crazy variation in figures is not likley an operator fault, a dyno day usually has 3 operators, one driving,the other 2 strapping and running the dyno. this reduces the chance of faults by the operator. Also if some cars are run in one gear and others in different gears this will give different results for different cars, if you test a car in 3rd the coastdown losses from say 6000rpm is a terminal speed of say 80mph so much less of a percentange of loss added to the bhp@wheels figure than a coastdown done in 5th with a terminal speed of 150mph, so flywheel figure will be estimated to be a lot higher due to a higher rolling resistance due to higher terminal speeds.  

heavyd:
My mates Civic made 230 bhp there today, 30bhp off an air filter is good going, I'll have to ask him what make it is, I think we all could do with one of those :laugh:

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