Hello Mate
Unfortunately it sounds as though you've been to one of the many 'race tuned' rolling roads out there.
The ONLY way to calculate flywheel bhp is from the Wheel bhp NOT vice versa a fairly acurate yard stick (it does vary slightly for a variety
of reasons) is to take your Wheel bhp and DEVIDE it by .85
therefore if your wheel bhp was 122.5 your flywheel bhp was actually
144.1.
I know this is not good news but,
1, you now know that the operator is either full of the brown stuff
or more likely doesn't understand basic physics.
2,Just like Oranco above pay Jamie at Jamsport a visit and see how
a real pro works and the difference it'll make to your car.
Hope this helps
The Dr