Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
LMU - Fuel Ratio setting suggestion for Bahrain Outer (GT3s)
#1
The fuel vs Virtual Energy concept takes some getting used to in LMU - particularly for cars like the GT3s that aren't hybrid and only have petrol to worry about!

Briefly - WEC no longer BOP cars using fuel-flow rates, restrictors etc. (well, not for GT3s in this context anyway) and use the notion of Virtual Energy instead (measured by a torque sensor on the rear axle - it gets around the whole issue of completely different engines by just measuring the amount of energy dumped on the rear axle).

Anyway - a couple of key points:
i) If you run out of VE (but still have some petrol left), you will get a SG (Stop/Go) of 100 seconds! That's a whole lap at Bahrain Outer... Note that if you run out of VE entering the pits and coast to your box - you're still going to get the SG.
ii) If you run out of petrol (but still have some VE), your race is over.
iii) Notwithstanding the above, you can use the Fuel Ratio setting to adjust how much physical fuel is put into the tank when you ask for 100% VE. The 'ideal' (for me) is to find a ratio such that the estimated number of laps for VE is equal to (or slightly less) than the estimated number of laps for the physical fuel...

The HUD overlay gives a readout of the current state of physical fuel (litres left in tank and estimated laps) and the VE (%ge left - and estimated laps).

For the Mustang, the ideal Fuel Ratio is about 0.83, 0.82 for the McLaren.

Increasing this number increases the physical amount of fuel added to the tank - too much and you are just carrying dead weight. Too little and you may have to pit early (while VE and physical fuel > zero) or run out of fuel, ending your race.

Reducing the figure might result in you running out of physical fuel before VE.

Other GT3s might vary (remember, this is part of the BOP) and your actual fuel/VE usage might vary from the estimates (short-shifting, lift'n'coast vs shifting at the red-line).

The suggestion is that you set the fuel ratio to around 0.83, set Virtual Energy to 100% in your car setup screens and then hit the track. If the estimated laps from fuel is a little higher than that for VE, I'd say you're good to go. These figures are in the bottom-right display of the HUD. Physical fuel is the pinkish bar with a fuel-pump symbol, VR is marked 'NRG' (EnErGy!)

(Fuel ratio can be changed under the Powertrain section of setup).
Cool
Reply
#2
...and in the pit menu (for when you are setting up what you want to happen when you box) - you are setting the amount of VE you want when you leave the box. Not the incremental amount to be added, not the incremental amount of physical fuel - VE on exit. If you pit earlier than planned, you may need to increase how much you want on exiting the box. If you pit later than planned (and don't run out of fuel or VE), consider reducing it.
Cool
Reply
#3
I found this advice in the forums: do a representative lap in practice, note the fuel usage and energy usage and use this calculator: https://ultimatesetuphub.com/pitstop-calculator
Reply
#4
(17-03-2025, 10:13 PM)Edvvc Wrote: I found this advice in the forums: do a representative lap in practice, note the fuel usage and energy usage and use this calculator: https://ultimatesetuphub.com/pitstop-calculator

One of the HUD tables in the lower-left display shows energy/fuel usage per lap and could be used for the pitstop calculator.

You do need to be a bit careful due to the way the in-race pit menu in LMU sets the absolute fuel level rather than the increment to top up with… e.g. if you use 4litres per lap (or 5% say in VE terms) and pit with 3.9l / 4.9% left in the tank after having run just a bit harder than planned, that ‘almost lap’ of fuel is wasted and you will need to increase the refuel request by a whole laps worth to compensate.

The good news is that the HUD calculations/measurements do seem accurate and repeatable - what I do is check the remaining VE lap estimate as I pass the pits and try to short-shift etc. until I consistently have 0.1/0.2 etc. laps showing above a full lap.

Oh - and if you haven’t noticed already, a recent change to the HUD shows the live VE of every driver in the positions table top-left (as it does in real life for the teams apparently). You can therefore see what kind of strategy each car is currently on (and any penalties - SG for stop/go, DT for Drive Through) in real time.
Cool
Reply


Forum Jump:


Users browsing this thread: 2 Guest(s)