Andy, RR's can be fixed so easily...Star performance for example. Even one of the boys megane on here ran alot of power on Pauls RR after a map and then ran a disappointing figure on a MAHA roller. Why was it higher on Pauls "Ego busting" roller than the Maha in this case! Hummmmmmmm....
RR...Pinch of salt?!
Agree Ali, thats what you have to take them as.
Funny you should mention Star Performance. After i took the car to Dastek and was told there was something wrong i took it to Star and got basically the same RR result.
Had the car modded at GDi, claimed power figure but never saw the graph was 197, another set of rollers in Cumbria saw mid 180's.
then had a problem with the car and 3 more sessions on this RR'd gave yet 3 more different figures approx differences of up to 10bhp apart
Went to GMC at Newton Stewart later on, recorded 167 @ wheels yet down at RS Tuning prior to map tweek it made 181 i think it was at the fly.
The crazy world of rolling roads eh lol