Fuelling check how do they do it?

Hi all,

Just after a bit of info from those that have been to a rolling road and had their fuelling checked.
How to they run the car to check fuelling, i.e from low gears at full pelt changing up so the turbo is spinning hard giving full boost or do they put it in 3rd or 4th at low revs then floor it?

Cheers
John

They put the car in a predetermined gear (sometimes 3rd, usually 4th) and then floor the throttle at a little over tickover and hold it flat out, often until the rev limiter, or maybe until the point where the power starts to drop off

During the run, they will have a wideband lambda probe inserted into the tailpipe which is able to measure the oxygen content of the exhaust gas, and thus calculate the amount of fuel being burned

Cheers Nigel, was just wondering about the gear/s they use.