How should we apply upgrades?

How can we get the most "bang" out of each upgrade and each slot?

For examples, if we look at Induction Kits, the most percentage HP increase (bang) per slot comes from Stage 1 for Induction Kits:

Stage 1 = 1.67% / slot * most efficient
Stage 2 = 1.20% / slot
Stage 3 = 1.29% / slot
Stage 4 = 1.40% / slot * 14% maximum increase

For Electronics, Stage 2 gives the most power increse per slot, but the percentage increase is much less, so maybe its slot could be put to better use in another upgrade, not this one:

Stage 1 = .50% / slot
Stage 2 = .53% / slot * most efficient
Stage 3 = .40% / slot
Stage 4 = .48% / slot * 8.6% maximum increase

So the most HP increase between the two upgrades comes from Stage 4 Induction upgrade, the most efficient use of slots, are marked with an *, so we need to consider what to increase first. Some upgrades, such as Cams, don't increase linearly, either, and some increase or decrease fuel consumption, so we need to pay attention to the details of each one.

Once we chart all upgrades, we can then more easily find the most bang per slot (we just need to do the math), but we also have to figure out which of the upgrades give so much more HP that we should deal with them in a certain order (if an upgrade is even available for a particular car) and put them in that order. But one thing is certain: for some cars, depending on the number of slots available and what the race is like, we will sometimes have to make compromises!

There are a few other aspects to some upgrades that we need to take into consideration, too. Some affect "performance" (so that needs to be defined) and some upgrades affect the use of fuel (which only factors into longer races), and some others affect non-power related things, such as stability, resistance to damage and other handling aspects of the car.

And here is the biggest catch: some upgrades, with the identical percentage power increase don't affect performance in the identical way! It was found that a 4% increase in engine tuning made the car perform better than a 4% increase from cams. This presents us with another challenge: how do we rank the upgrades in order of actualperformance increases?

Also, be careful about needlessly wasting slots. Some upgrades are placebos, in that they don't do anything that noticably affects performance of the car, even in Pro Sim mode.

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Induction Kits	Stage 1	Stage 2	Stage 3	Stage 4
Slots	3	5	7	10
HP Increase	5%	6%	9%	14%
% / Slot	1.67	1.20	1.29	1.40
Fuel Efficiency	-4%	-7%	-14%	-20%
% / Slot	-1.33	-1.40	-2.00	-2.00

Turbochargerss	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	5	7	9	12	15
HP Increase	4%	7%	9%	10%	12%
% / Slot	0.80%	1%	1%	0.83%	0.80%
Fuel Efficiency	-2.8%	-3.2%	-4%	-5%	6%
% / Slot	-0.56%	-0.46%	0.44%	-0.56%	-0.40%

Electronics	Stage 1	Stage 2	Stage 3	Stage 4
Slots	6	9	15	18
HP Increase	3%	4.8%	6%	8.6%
% / Slot	0.50%	0.53%	0.40%	0.48%
Fuel Efficiency	2%	4%	8%	10%
% / Slot	0.33%	0.44%	0.53%	0.56%

Dump Valves	Stage 1	Stage 2	Stage 3	Stage 4
Slots	4	5	6	8
HP Increase	2.4%	5%	6%	8%
% / Slot	0.60%	1%	1%	1%

Ignition Kits	Stage 1	Stage 2	Stage 3	Stage 4
Slots	2	4	6	9
HP Increase	2.2%	4.1%	5.8%	7.2%
% / Slot	1.10%	1.03%	0.92%	0.80%
Fuel Efficiency	-1%	-2.2%	-4.5%	-6%
% / Slot	-0.50%	-0.55%	-0.75%	-0.67%

Engine Tuning	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	3	5	7	10	13
HP Increase	1.8%	2.5%	4%	5.2%	6%
% / Slot	0.60%	0.50%	0.57%	0.52%	0.46%
Fuel Efficiency	2.2%	4.2%	6%	7.5%	8.5%
% / Slot	0.73%	0.84%	0.86%	0.75%	0.65%

Cams	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	1	2	4	5	7
HP Increase	1%	2%	4%	5%	6%
% / Slot	1%	1%	1%	1%	0.86%
Fuel Efficiency	-1%	-2%	-3%	-4%	-5%
% / Slot	-1%	-1%	-0.75%	-0.80%	-0.71%

Clutches	Stage 1	Stage 2	Stage 3	Stage 4
Slots	4	6	9	12
HP Increase	2%	2.7%	3.8%	5%
% / Slot	0.50%	0.45%	0.42%	0.42%

Intercoolers	Stage 1	Stage 2	Stage 3	Stage 4
Slots	4	6	7	9
HP Increase	2%	3%	3.5%	4.5%
% / Slot	0.50%	0.50%	0.50%	0.50%
Fuel Efficiency	-1%	-2.2%	-4.9%	-7%
% / Slot	-0.25%	-0.17%	-0.70%	-0.78%

Exhausts	Stage 1	Stage 2	Stage 3	Stage 4
Slots	3	5	7	9
HP Increase	.50%	1.2%	2%	3.5%
% / Slot	0.17%	0.24%	0.29%	0.39%
Fuel Efficiency	1%	1.8%	2.7%	3.8%
% / Slot	0.33%	0.36%	0.39%	0.42%

Flywheels	Stage 1	Stage 2	Stage 3	Stage 4
Slots	1	2	5	6
HP Increase	0.8%	2%	2.4%	3%
% / Slot	0.80%	1%	0.48%	0.50%
Fuel Efficiency	0.5%	1%	1.8%	2.2%
% / Slot	0.50%	0.50%	0.36%	0.37%

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Transmission Kits	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	2	5	7	12	14
Performance Increase	2.8%	3.5%	4.5%	6%	8%
% / Slot	1.40%	0.70%	0.64%	0.50%	0.57%
Gear Change Speed	17%	26%	32%	40%	50%
% / Slot	8.50%	5.20%	4.57%	3.33%	3.57%

Roll Cages	Stage 1	Stage 2	Stage 3	Stage 4
Slots	4	6	8	11
Performance Increase	1.2%	1.8%	2.5%	3.8%
% / Slot	0.30%	0.30%	0.31%	0.35%
Dmg. Resistance	3%	4.2%	6%	12%
% / Slot	0.75%	0.70%	0.75%	1.09%

Strut Braces	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	3	6	9	12	14
Performance Increase	0.5%	1%	1.8%	2%	2.5%
% / Slot	0.17%	0.17%	0.20%	0.17%	0.18%
Dmg. Resistance	3.5%	4.5%	8%	15%	17%
% / Slot	1.17%	0.75%	0.89%	1.25%	1.21%

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Brake Kits	Stage 1	Stage 1	Stage 1	Stage 1	Stage 1
Slots	5	7	8	9	12
Brake Strength Increase	7	10	11	12	13
% / Slot	1.40%	1.43%	1.38%	1.33%	1.08%

Brake Hoses	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	1	2	4	6	10
Brake Strength Increase	2%	3%	4%	6%	7%
% / Slot	2.00%	1.50%	1.00%	1.00%	0.70%

Engine Hoses	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	4	7	9	10	11
Overheating Decrease	5%	7%	11%	12%	15%
% / Slot	1.25%	1.00%	1.22%	1.20%	1.36%

Oil Coolers	Stage 1	Stage 2	Stage 3	Stage 4
Slots	4	6	9	11
Overheating Decrease	4%	6%	7.5%	8.5%
% / Slot	1.00%	1.00%	0.83%	0.73%

Seats	Stage 1	Stage 2	Stage 3	Stage 4
Slots	1	2	3	4
Structural Stability Increase	1.4%	1.8%	2.8%	5%
% / Slot	1.40%	0.90%	0.93%	1.25%

Suspension Kits	Stage 1	Stage 2	Stage 3	Stage 4
Slots	2	5	7	12
Suspension Damage Decrease	4%	9%	12%	25%
% / Slot	2.00%	1.80%	1.71%	2.08%

Tires	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Slots	3	4	8	12	16
Traction Increase	1.4%	2%	2.8%	3.5%	6%
% / Slot	0.47%	0.50%	0.35%	0.29%	0.67%
Wear Decrease	2%	3%	4.5%	5%	5.5%
% / Slot	0.67%	0.75%	0.56%	0.42%	0.34%

Wheels	Stage 1	Stage 2	Stage 3	Stage 4
Slots	1	2	4	6
Damage Decrease	2.5%	4%	7.2%	10%
% / Slot	2.50%	2.00%	1.80%	1.67%

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