Stage 1 only will get 40bhp gain with no other mods. Stock cars came in bang on the money Ben, so Jkm's rollers are accurate.
Depends Ben, If a set of rollers say your car produces x ammount thats more then other rollers then of course you gonna say the one that posted more is the one to believe in.Its a dyno lottery, which no one has the answer. Mine were down 10bhp for shoving redEx in the tank, but all other graphs were bang on the money as my last 3 runs.
278bhp from a Stage 1 Revo car is a bit concerning.. Unless the car has faults or crap fuel etc..
x2
No her car is running faultless, and isnt done on power. Claire and her Husband ran some other tests prior to going on jkm's rollers which measures the cars estimated bhp. It came out 2bhp out.
So to see 2 stock cars pull stock factory figures, and claires came out exactly as they predicted, was some sort of proof that they are fairly accurate and not "Optimistic" as some other roads can be.
Remember she has only a map and nothing else, no exhaust , just standard so 290 teritory would be a reasonable estimate.
We're back to this same old argument which will never be solved in anyones opinion.
Its not all about chasing "Big numbers" as at the end of the day, thats not the be all and end all.
I agree mate that it's not all about chasing numbers. But it just seems that JKM seem to be the only RR in the country that I have seen that consistantly give low figures on mapped/tuned cars.. 290bhp terriotory is a reasonable estimate, yeah. But it's not 290bhp, it's 278bhp and if I had payed £500 for 300bhp, that is what I would want, not 22bhp less..
I for one don't really care whether my car RR's at 330bhp or 33bhp as it is what it is and still goes like stink (when I can drive it 
), but if I was to put mine on JKM's rollers and it pulled around 290bhp then I would seriously question it's accuracy as it goes a lot quicker than 290bhp and would defy the laws of physics if it actually was..
Just seems odd that when some of our chaps run there car at JKM compared to other RR's, they are always way down on what they read elsewhere (even if they are another set of DD rollers like Weston Performance for instance)..
Like you say though, it's going to be near on impossible to prove and you can't fault JKM's accuracy for standard car's figures, but it just seems that modded/mapped cars always seem to pull crap results compared to every other RR in the country..
Agree with you ben , but also there is a slim chance that out of about 7-8 different tested Rollers from anyone from here, that one of them maybe the more accurate then the others.
How can you feel whether your car is 330bhp then something thats 290bhp. How can you interept that?? i cant, doesnt change the Ed30's are flippin fast mapped, but also if comparing something " the feels " a certain hoursepower is very hard to interpret. Power to weight if measuring against other higher powered vehicals is again as we know difficult to measure.Only from vid evidence has proven that but thats were this particular sentance stops.
Revo from memory dont claim 300bhp on their maps. Again depends on where the cars are tested to throw up that senario.
All im trying to say is, a car feels quick but i for one couldnt turn and say to you, your car feels like its got 320 bhp under the bonnet, because i and most others couldnt easily predict that.
There will never be a conclusive answer except in our own minds be happy with the way the car drives and if she can handle the power then HAPPY days, and you know the time to stop chasing these "Bigger" figures
