Had my bike dyno'd the other week.

Originally Posted by ogden

122? That's 750 power, not 600 power.

Not really, most of the 2008 600s are putting out real world dyno figures of that level. Olie Linsdell's Black Horse Racing R6 supersport bike is putting out 123bhp at the rear wheel with no engine tuning, just pipe and filter changes.

Originally Posted by ThEGr33k

No... I did research into the subject and it turned out he was right. If you want crank HP you need to take a direct drive off of the engines crank and if anything else says its measuring crank HP its a guess.

Bearing in mind dyno runs are generally done with the back wheel, that didn't need research, that is bleedin obvious!! You don't need to measure crank HP, you can take RWHP and add in a fudge factor to get (estimated) crank HP.

Point is, many rear-wheel dynos will give you a printout that is actually the calculated crank HP NOT RWHP as it makes the customer happy!!

Hence why you need to ask ... a tell tail sign is if your bike is stock and producing manufacturers HP or better, it is safe to assume it is 'dyno tuning' not your bike

Sadly 'dyno tuning' (purposely poor dyno calibration or giving you estimated crank HP instead of RWHP) to make customers happy is rife ...

If it doesn't say RWHP on the chart ... you are prolly safer to assume it is showing crank HP until proven wrong ...

No mistake on this one ... as you can see the 3 lines are identical, just 2 of them have 'fudge factors' ...

You can see if given only one line you wouldn't know which of the 3 it was

Aye Blue I got to agree. Fair enough

Originally Posted by Lozzo

Not really, most of the 2008 600s are putting out real world dyno figures of that level. Olie Linsdell's Black Horse Racing R6 supersport bike is putting out 123bhp at the rear wheel with no engine tuning, just pipe and filter changes.

There is someone on here with a Gixxer 750 and he got 117 on a dyno run with Zorst done... The problem is that its sooooo easy to fudge results to read higher and unless the bikes were tested back to back on same dyno same operator then its impossible to compair tbh...

You also have to remember that no two dynos will give the same results for the same bike and atmospheric conditons. A dyno run is only useful when doing back to back comparisons when tuning an engine. You start with the stock bike and then do another dyno run to see how the tuning has affected performance, then another, ad infinitum until the optimum performance has been reached.

Saying your bike has xbhp has no relevance in real terms. My CBR600 had 95bhp at the wheel, but on someone else's dyno it could be as low as 85 or as high as 100.

Originally Posted by yorkie_chris

Well aye but it'd look silly with the scale going to 10,200rpm (for 650...)

Some 600's the needle is pointing a few '000 too high at high revs.

How do they get away with that then?
Speed in a gear doubles - rpm in that gear doubles.
A bit blatantly obvious, too obvious to attempt to dupe people no?