I've just got back. The torque figure seems to be similar across all 3 dynos, the bhp figure is out by alot across all 3
Rick @unicorn knows his stuff and I learned a thing or two. He calls his dyno the heartbreaker lol..
I won't be going on anymore dyno runs now till I've put on a couple of thousand miles
Videos is abit shaky as it was cold!
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There are people out there far more knowledgable about this than me, however my understanding is that the engine produces a said amount of BHP and a certain quantity is lost through transmission etc before it gets to the front/rear/all wheels.
One common and minor mistake is that people quote PS as BHP. The RS3 produces 362BHP and 367PS. It amazes me how so many motoring journos concentrate so much on the RS3's apparent brake-fade or lack of turn-in, but can't even quite figures accurately.
If you haven't noticed it already, I hope you do now - really grinds my gears!!!
Every dyno will give different numbers.. The dyno at 397 and the 345 both give 290 at the wheels. It's the software calculation that differs for the power at the flywheel
This run did produce a little less than I was expecting, but I wouldn't worry too much as the engine hasn't done many miles.
Dyno Dynamics/Developments Dyno's are known to be accurate, but also known as the heart breaker dyno as they read lower than most others.
For what it's worth I have a background in instrumentation engineering and so take calibration of the Dyno very seriously. I use both a lab calibrated load cell and also a certified test weight accurate to a fraction of a gram to check the dyno's load cell calibration. It is not in my interest to fudge the figures for two reasons. Firstly I write all my own software maps and therefore need accurate results to see cause and effect. Secondly when I quote a power figure and then the customer takes the car to another Dyno, they are not going to come back to me complaining that it's underpowered...
Most factory standard cars I run make very close to manufacturers published figures. I tune a lot of Golf R's and S3's and they make between 292 and 296bhp usually, but some have been as low as the low 280's. On these it is often down to poor fuel batch, as when run on 95 they are making less than 280bhp. Factory quote 296. As another example, BMW 435D, factory quotes 309bhp, on my Dyno made 311bhp. 2014 BMW 125D quoted power is 215bhp, power on my Dyno 218bhp.
Dynojet dyno's are American and they are calibrated differently and are suitable really for comparing American wheel horse power numbers and aren't really that useful as a comparison in the UK. Google Dynojet vs Dyno Dynamics if you want more comparisons.
As a note, rolling roads, aka chassis dynos measure wheel horse power, and then estimate engine horse power. Engine horsepower rightly or wrongly is what is used in the UK for comparisons. Maha Dyno's are quality and accurate dynos when it comes to measured wheel power, but, for some reason give highly inflated transmission losses and therefore high flywheel/engine power figures.
This car was also run on a Maha dyno where it produced 280bhp at the wheels. On my Dyno, 287.6 bhp so pretty much identical. The difference is that the Maha adds over 100bhp, i.e. well over 30% for transmission loss, which is unrealistic.
The RS3 8V quoted power is 361bhp, so we are about 4.5% down in this case.
If anyone has an RS3, I will give you a power run free of charge for interest/educational purposes, just drop me a PM