As I’m still confused over which is better, what do you guys think is the better upgrade? On paper it looks like camshafts is better than displacement but I’ve heard that it isn’t worth the pi cost and that you can get more out of upgrading displacement. I’m really not sure…
if you can squeeze the cam in there while keeping all the necessary parts to keep int your class / homologation group then go for it , many go for parts that use the least amount of PI for the most gains
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With the cams you have a longer rev span, which means you keep the gears longer.
You can shift later, which costs less time on short straights 
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Will depend on the size of the enegine vs car weight. As long as the tires still hooks up, go for displacement. The game counts your top hp-number, not the powerband all way up.
Max hp`s is just a fancy number, tourqe accelrates the car
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Horsepower gives you top end. In your division/class, you may not need it. Top speed is the least important stat.
However, if you consider using a camshaft upgrade, prime candidates are old muscle cars, which already have enough torque, and FWD hatchbacks, which benefit from broader, less torquey powerbands.
Displacement usually works like ignition, ECU, etc., it gives you better numbers at no weight benefit, which means it gives you more power/torque per credits. This way, it can be a better upgrade than pistons, for example.
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I’ve always used to do cams, but now I usually do everything but cams unless the car either has really low RPMs stock or it’s got enough torque.
I’ve done a little experiment on FH3 on how much torque engine upgrades give vs horsepower. I was checking the upgrades of a Camaro with a stock engine, so it might be different for other cars. I’ll put down some abbreviations I’ll be using so I don’t take up too much space:
HP:T - Horsepower to Torque ratio. Above 1 means more horsepower gained than torque, below one means more torque gained than horsepower.
(Any #s in these parenthesis) - HP output, Torque output, and HP:T ratio of upgrades after applying a race camshaft upgrade.
Torque is in lb-ft
Air Filter - HP: 14(20) - Torque: 21(23) - HP:T: .67(.87)
Intake Manifold - HP: 18(27) - Torque: 28(31) - HP:T: .64(.87)
Carburetor - HP: 20(30) - Torque: 31(35) - HP:T: .65(.86)
Ignition - HP: 17(24) - Torque: 26(28) - HP:T: .65(.86)
Exhaust - HP: 22(32) - Torque: 34(38) - HP:T: .65(.84)
Camshaft - HP: 79 - Torque: 43 - HP:T: 2.32
Valves - HP: 16(23) - Torque: 24(27) - HP:T: .66(.85)
Displacement/Block - HP: 29(43) - Torque: 45(51) - HP:T: .64(.84)
Pistons/Compression - HP: 19(28) - Torque: 30(33)
Oil & Cooling - HP: 9(14) - Torque: 14(15)
Overall Average Horsepower Increase After Applying Racing Camshaft Upgrade Across All Parts: 32.1%
Overall Average Torque Increase After Applying Racing Camshaft Upgrade Across All Parts: 9.4%
Basically I would upgrade the cams so there’s a good amount of horsepower all around, but not too much or the PI would skyrocket. A low-displacement, high-revving four cylinder would benefit more from displacement upgrades than a large displacement, low-revving V8. Plus there’s always having benefits to having a high revving car. There’s also the car itself to consider. If it’s a giant american land yacht it would probably be best to keep the revs low and the torque high so it can move all of that weight around. If it’s a light weight coupe that mayor may not have a lot of tire, camshaft upgrades increase horsepower but not torque as much, so the car won’t be spinning all over the place.
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Thanks guys. Feel like I’ve learned a little something today.