Porschetech3

DIN HP ( din) or BRAKE HP ( bhp) is commonly used in the UK ... SAE HP is commonly used in the US

Justin76

so it's 365.4 SAE

Porschetech3

Yes, but not WHP

zbomb

The graph doesn’t reflect BHP - it says HP.

Since it was measured on a rolling road, I’m referring to it as WHP.

Porschetech3

I quick Google search shows I was right.....

Wayne Schofield at Chipwizards has always shown Dyno Horsepower at the flywheel ( BHP ) from his rolling road..

It is common practice for the dyno to make measurements then corrections and calculations from actual Torque to whatever "hp" figures they want...

Custom Map by Wayne Schofield at Chipwizards in Rochdale, 487.7bhp @ flywheel, 546ft/lb @ 3500rpm. The front propshaft has been removed for the 2wd mapping process. Totally standard 996 Turbo (K16's).

zbomb

I don't see whatever you are trying to show me, I watched the video. If you can show me where it is confirmed the number is BHP, happy to edit the post with the graph.

I have spent A LOT of time on chassis dynos, specifically dyno dynamics but dynojet also - What you are saying is common, is totally uncommon for me.

Porschetech3

If you click the actual Youtube video and watch the video on Youtube and look at the description you will see. ( I have added the description to my comment also)

Other work from Wayne shows the same pattern....

zbomb

OK - but that isn't the graph we are looking at and I didn't see a graph that matches the format posted...

I'll ask the person that sent me the graph to see if they can confirm.

Porschetech3

Cool, and if Wayne HAS changed his MO after all these years,,,there must be a GOOD reason....

Justin76

also if you watch the end of the video the graph shows it's roughly 350 on graph.. so that video proves nothing and it confusing as crap.. not to mention it's a 13 years old video.. I'm sure things have changed

Porschetech3

Things are done differently in different parts of the world..ROW..

BRS-LN

The Dyna- PAC hub dyno and Land And Sea rolling road dyno that we had at my old job both had a graph option to utilize percentages of drive train loss in the graphs to illustrate crank HP figures.
I think that is what we are seeing here. Tests performed at the wheels with percentages of drivetrain loss figured into the graphs to plot crank/ flywheel power.
That’s just assumption, and could be completely inaccurate.
We always plotted the figures on those dynos as dual plots, showing wheel power and the calculated power in the same plots. I know that the Dynojet rolling roads do not offer this graphing option.

zbomb

Post a graph of an engine you sell.

What are you doing in this thread if you’re not doing that ? I value your opinion of engines and data that aren’t yours, none at all until you put your money where your mouth is and provide something of value.

All you do is talk.

ETA. I had always thought that Charles was a pretty smart guy… that was until he gave you the keys to represent his company here. He brought facts and although I disagreed with him on efficacy occasionally, at least he wasn’t a straight up junior sales guy.

Atgani

You’re correct in all you’ve said about Wayne Schofield here in the UK.
This is his dyno curve from my Mk 1 996 GT3 fitted with a factory Motorsport Department 2009 3.6
Cup engine with some trick inconel headers, lightweight big bore silencers and decat. Wayne engineered
the strategy for the two resonance flaps from scratch, and designed and installed the driver’s and operating
systems for them. Having done so he then mapped the whole lot.
His dyno curve shows 465.7 flywheel BHP and 404.8 wheel BHP.
Apologies for the poor quality of the image, it was screen grab taken by Wayne.

Justin76

so the graph is whp and flywheel
this graph is only showing whp as the 404 whp is shown on the graph not the flywheel. Also by the looks of things he either has upgraded his system of has a way to show the graph and information better than this dot matrix image.

Geez you guys need to upgrade systems over there my gosh.. do you even have HD television at this point