Solved

Has something changed?

I recently returned to racing after a 7-8 month break.  I expected the season to be hard as I thrown way/deleted all my past race data  so was treating the season as a relearning experience.

However last nights race had me stumped   It’s a 2 car league and all 10 practice laps showed as 2.4l

For a 54 lap race that equated to 129.6 (130) at pl3.  Turkey had always been a track I struggle with so set one car at pl5 and the other pl4 and set the fuel for each car accordingly.

For car I set fuel at 136L for pl 5 and for car 2 I set fuel at 134L.  

My end results showed both cars were overfuelled.  I tried to set fuel based on fact that useage is non linear and it’s easy to underestimate the amount needed for pl5.

It’s not that I was overfuelled that stumped me but rather the fuel usage compares to the practice laps.

Car 1 at pl 5 used  131.9L equating to a lap usage of 2.44L

However Car at pl 4 used 128.1L equating to a lap usage of 2.37L.

I can accept the results for car 1 as just me overestimating the extra fuel required, but car 2 seems to have used less fuel per lap at pl4 then the practice at pl3 indicated.

What am I missing ?  Each lap on the race log showed fuel usage as either 2.5 or 2.4L.  This was an offline race so fuel use was not impacted by change of push level.  Is this just a function of rounding (I’m sure practice laps previously showed to 2 dp rather than 1dp) or has something else changed?

Without the use of a Technical director that specializes in fuel economy, the fuel data received from practice runs are estimates and not the accurate amount.

The practice runs are based on a rounding system:

2.34 = 2.3
2.35 = 2.4

 
wow

PL3 is either 2.35 or 2.36 (default PL3 practice plus as you say, rounding range)
PL4 is 2.37/8 by Skid's data and 
PL5 is 2.44 by Skid's data

I mean i get there is a range that without the Tech you can't see the hundredth but 2.35-2.44 where 3 and 4 are like .01-.03 apart and then a jump of .07 to PL5 is massive.  

Thanks it was an offline race so pl was consistent and I had tried to adjust for non linear impact of higher pl.  I wasn’t really aware of the TD change (must have happened when on my break) and applying the ability last night made all the difference and my calcs were spot on, although I await China to see how it works there 😳