Fellow tuners: If you have to constantly adjust the fuel mapping you're leaving a lot of unused PP on the floor, right?

[Magog]

Essentially you're lowering your PP every time you use a leaner fuel mix so to get the most out of a car in a race limited by PP you would want to adjust the engine down first at least to the point that you don't have to adjust FM as I see it. Thoughts?

 

[MatskiMonk]

Yeah, but you still get full PP at fuel map one if you need it. If you tune down the engine for fuel economy you surely won't be at full PP anyway? I rather have the adjustability in race.

 

[Greycap]

The problem is that the power restrictions don't do nearly as much to the fuel consumption as the fuel maps do. There's this old thread about GT Sport, I'd imagine the values are still the same or at least close.

Gran Turismo Sport - fuel consumption list & tire usage

I have in plan to add every upcoming car and track. So here is how I'm doing it, in order to exclude human factor, I leave driving to AI. Changed track to Tokyo Expressway - East Outer Loop (7301m). To make it more comparable in the race car class, all cars are set to their BoP values. All...

www.gtplanet.net

So if you have a 500 bhp car and you tune it down to 80%, ie. 400 bhp, your fuel consumption changes barely at all but I'd bet it's also somewhere in the 80% range at best. On the other hand if you run the 500bhp car on FM6 you'll again have 400 bhp but the fuel consumption drops to nearly 60% which can mean skipping a pit stop or even two.

 

[BangsMcCoy]

Essentially you're lowering your PP every time you use a leaner fuel mix so to get the most out of a car in a race limited by PP you would want to adjust the engine down first at least to the point that you don't have to adjust FM as I see it. Thoughts?

I disagree and say the complete opposite. You want to set PP at max possible for the race and use FM as needed during it.
It is in your best interest to enter a 700pp race as close to 700pp as possible and have the option to dial it back for the sake of fuel savings only when needed. If you drop to say 680pp by lowering your power with ECO or Restrictor before the race then there is no way to ever use that 20pp worth of power in the race as you can only go “down” further with FM settings.
The only time that may be an advantage is when looking at the power curve and a track layout. Sometimes it’s beneficial for certain cars on certain tracks to adjust those for less max power when it will optimize the power curve for the race. Generally speaking though, you want as much PP as possible before entering the race because even if you dial back power to optimize the power curve you’ll want to use that extra PP you have in terms of aero or tire choice most likely.

Every time you bump up the FM setting (go leaner) you’re effectively lowering its performance only in terms of power output, but at the same time you’re also lowering fuel consumption, which is the main reason people increase FM setting to get more laps without pitting. Though it can be useful to help save tires or prevent wheel spin on wet tracks too. People aren’t typically using it to lower the perform during a race, but to take advantage of fuel savings. You’re not really affecting your PP as you can adjust this setting at will during a race. This trade off is always beneficial to you as your fuel consumption goes down considerably in comparison to the power output loss. This can be adjusted on the fly throughout the race as needed and you’ll have full use of every PP you can have when needed. If you lower your PP before the race there is no way to get that performance back in the race, you can only go “down” by increasing FM but you can’t go lower than FM1 to increase power and somehow get back that power you cut before the race.

 

[Magog]

You mus

I disagree and say the complete opposite. You want to set PP at max possible for the race and use FM as needed during it.
It is in your best interest to enter a 700pp race as close to 700pp as possible and have the option to dial it back for the sake of fuel savings only when needed. If you drop to say 680pp by lowering your power with ECO or Restrictor before the race then there is no way to ever use that 20pp worth of power in the race as you can only go “down” further with FM settings.
The only time that may be an advantage is when looking at the power curve and a track layout. Sometimes it’s beneficial for certain cars on certain tracks to adjust those for less max power when it will optimize the power curve for the race. Generally speaking though, you want as much PP as possible before entering the race because even if you dial back power to optimize the power curve you’ll want to use that extra PP you have in terms of aero or tire choice most likely.

Every time you bump up the FM setting (go leaner) you’re effectively lowering its performance only in terms of power output, but at the same time you’re also lowering fuel consumption, which is the main reason people increase FM setting to get more laps without pitting. Though it can be useful to help save tires or prevent wheel spin on wet tracks too. People aren’t typically using it to lower the perform during a race, but to take advantage of fuel savings. You’re not really affecting your PP as you can adjust this setting at will during a race. This trade off is always beneficial to you as your fuel consumption goes down considerably in comparison to the power output loss. This can be adjusted on the fly throughout the race as needed and you’ll have full use of every PP you can have when needed. If you lower your PP before the race there is no way to get that performance back in the race, you can only go “down” by increasing FM but you can’t go lower than FM1 to increase power and somehow get back that power you cut before the race.

You misuderstood me. Of course you want to Max PP but my thought is that you may want to sacrifice HP before aero, weight or tires.

 

[Dave A]

I'm sure it will depend on the car/track combo. At Le Sarthe and Nordschleife, both of which are very fast tracks, you probably want the power. Besides, as mentioned above, fititng better tyres won't make a notable difference to your fuel consumption. Lowering your power will, but not as significant a difference when compared to utilising the fuel maps, so you will still need to pit in more often for fuel lowering your power compared to using a fuel map.

But as far as reducing power to use better tyres for example, that is a viable stratergy, but on some tracks you may be better choosing Racing Hards and more power over Racing Mediums for example. The race length, track and car all need to be taken into consideration.

 

[05XR8]

I'm sure it will depend on the car/track combo. At Le Sarthe and Nordschleife, both of which are very fast tracks, you probably want the power. Besides, as mentioned above, fititng better tyres won't make a notable difference to your fuel consumption. Lowering your power will, but not as significant a difference when compared to utilising the fuel maps, so you will still need to pit in more often for fuel lowering your power compared to using a fuel map.

But as far as reducing power to use better tyres for example, that is a viable stratergy, but on some tracks you may be better choosing Racing Hards and more power over Racing Mediums for example. The race length, track and car all need to be taken into consideration.

I definitely agree it’s track and conditions dependent. Plus, obviously, car choices. Another note is, in general, I choose handling over speed. Even though it presents a challenge on certain straights, a superior handling car can make up that loss over over distance.
As for cars, for me, the lighter the vehicle, the better. That can aid in stretching fuel use and tyre wear.

 

[Meythia]

You misuderstood me. Of course you want to Max PP but my thought is that you may want to sacrifice HP before aero, weight or tires.

Aero > HP=tyres > weight

Aero makes the car go nice
HP and tyres make the car go faster
as well as does weight, but I think here the PP calculations are skewed by its bugs that often occure and are not equally weighted, making weight the least desirable change to a car.
Unless the car is already very light and cant get as much power.

This is just my opinion based on a preference on already light cars and spending much time in Tokyo 600 and Deep Forest 1h 600

 

[BangsMcCoy]

You mus

You misuderstood me. Of course you want to Max PP but my thought is that you may want to sacrifice HP before aero, weight or tires.

Ok, so to directly answer your title question “Fellow tuners: If you have to constantly adjust the fuel mapping you're leaving a lot of unused PP on the floor, right?” the answer is no. Your PP is assigned before the race based on your active setting sheet, whatever changes you make during the race do not affect your PP.
There is no “unused PP” by changing FM settings. PP rating does not equal actual performance. PP is a rating assigned to your car at that specific combination of settings on the active setting sheet, but you can further adjust its actual performance in race by changing settings like FM, TCS, torque differential or using nitrous or DRS. Your PP is what it is whether you use these or change them or not.
At FM1 you have full access to all your power at your set PP which PP does not fluctuate during the race if you change FM settings. When you increase FM you’re only adjusting your air/fuel ratio and power slightly decreases as fuel efficiency significantly increases as FM goes up, but this doesn’t affect PP rating at all.
Same thing with torque differential setting, TCS and brake settings, these specific settings that can be adjusted in race aren’t factored into PP rating but they do affect your cars actual performance by changing them. You aren’t leaving or losing any PP by increasing FM setting, you’re only slightly decreasing power output to gain fuel efficiency, which is tied to actual performance, not PP rating.

To answer the other part “my thought is that you may want to sacrifice HP before aero, weight or tires.” …there isn’t one correct answer. Sometimes you may want to sacrifice aero before HP. Sometimes you may want to sacrifice tires before HP. The 2 biggest factors here are generally what car you’re driving and what track. Some cars you need more power and less aero. Some cars need more aero but less power. Some tracks demand more grip than power.
There are too many variables to factor, you can’t just always assume one specific 600pp tune on a car will work best for all tracks. That’s why learning how to use and taking advantage of the settings like FM are important in the races where these are utilized.

 

[Greycap]

Another thing people don't seem to consider, is that the fuel consumption can (and probably should) be considered as a part of the PP calculation. In other words, the overall performance of the car doesn't necessarily go down when the power is reduced through the fuel maps.

Example 1: You have a car that does laps in 1'30 but can only do five laps on a tank.
Example 2: The same car, using FM6, can only do laps in 1'32 but gets eight of them out of a tank.

In a 10 lap race the first example would win, in a 15 lap race it would be pretty much a tie, in a 20 lap race the first one would be slightly ahead again - and that's not even taking into account the tyre wear differences caused by the lower stress of running the leaner map which could give the second example an advantage as the reduction in grip would be less through the stint.

 

[Meythia]

Another thing people don't seem to consider, is that the fuel consumption can (and probably should) be considered as a part of the PP calculation. In other words, the overall performance of the car doesn't necessarily go down when the power is reduced through the fuel maps.

Example 1: You have a car that does laps in 1'30 but can only do five laps on a tank.
Example 2: The same car, using FM6, can only do laps in 1'32 but gets eight of them out of a tank.

In a 10 lap race the first example would win, in a 15 lap race it would be pretty much a tie, in a 20 lap race the first one would be slightly ahead again - and that's not even taking into account the tyre wear differences caused by the lower stress of running the leaner map which could give the second example an advantage as the reduction in grip would be less through the stint.

This examples dont make sense.
Using FM to say "consumption has to be part of PP" is missing the point, because PP is set and FM can be set on the fly.
You both examples dont say 1 or 2 wins, because it is still the same car with the same PP, you can chose HOW you want to win with it.

What you actually wanted to say is "base consumption has to be simulated while all simulations are run on FM1 to make an even ground".
This way you can compare 2 cars with the same PP but totally different consumption rates, like the Taycan on Deep Forest who is running faster laps than most of the other AI but pits more often.
Though on the other hand you wouldnt find a match of PP without considering that engine revs are not always best when at the lmit, as for example the DP100 is showing. And switching earlier will give you an advantage on consumption.
I guess, the DP100 has low PP because the game simulates it switching at the limit (automatic transmission setup), which slows it down quite a lot.