Very often there are messed up sounds across vehicle mods.
I started categorizing in-game engine sounds, so that it was easier for me to assign correct engine sounds onto my mods and other peoples´. I hope this list can solve many wrong sound problems and save time for modders.
I use names from hash-labels, so don´t get confused! You can copy-paste them directly under "audioNameHash".
This is a raw-list, BOLDED names are my personal favourites (they somehow stood up more for me) and unbolded sounds are usually much more "generic".
R4 petrol engines
BLISTA - Lower revs
BLISTA2 - Same as BLISTA3
BLISTA3 - Same as BLISTA2
BRIOSO - Higher revving 4cyl
KURUMA - Japanese modern daily 4cyl
B4 petrol engines
SULTANRS - Yes, this is the Subaru boxer engine.
R5 petrol engines
OSIRIS - This is quite a good resemblance of the legendary Audi R5 AAN/ABY/ADU & etc. engines.
B6 petrol engines
COMET - Yes, this is the Porsche boxer engine.
R6 petrol engines
CASCO - Classic sports cars. In theory would fit some older BMW-s as well.
ELEGY - Japanese sporty R6. RB26DETT! Or simply said - Skyline R34!
INSURGENT - Lower revs, better for trucks/vans, Chevrolet Astro?
SENTINEL - BMW! Especially older models like E34, E36 325i/328i
V6 petrol engines
HABANERO - V6 engine with SUPERCHARGER!
ROCOTO - Higher revving.
SULTAN - Higher revving.
WARRENER - Older V6.
V10 petrol engines
BANSHEE - American V10, higher revving/louder. Dodge Viper!
JACKAL - Lower revving/more silent.
NINEF - Germanese V10, as the car properly looks like R8 V10
V12 petrol engines
BESTIA - Higher revving V12.
BODHI - Beautiful bit older V12 engine sound, but with "diesel" idle
BRAWLER - ?
CHEETAH - Higher revving V12, ideal for many Ferraris and other supercars.
GUARDIAN - Older V12, but with "diesel" idle
SCHAFTER4/SCHAFTER6 - Modern V12 engine, suits best for luxury sedans. SCHAFTER6 is the same.
TYRUS - Racecar V12, powerful stuff!
W16 petrol engines
ADDER - Powerful W16. Bugatti Veyron!
Nothing to write here, silent hill!
Diesel engines are strange, they are mostly quite bad, basically there aint any modern turbodiesel sounds (Audi,BMW,MB etc.)
CAMPER - I like this the best from the rest.
V8 petrol engines
There are quite a lot of V8-s in this game. I try to categorize them, using common sense based on a lifelong interest in cars.
Straight-pipe, raw - Mostly used on older muscle cars. I think it is one of the most realistic engine sounds to use in game, when to put it on an actual muscle car or car with straight-pipes (catless).
GAUNTLET - bit less louder/more muffled sound
MAMBA - my favourite of the list
PICADOR - bit less louder/more muffled sound
Straight-pipe, raw (extreme Harley Davidson/tractor sound) - Basically the same, as above, but these are already tractor sounds, which You will meet on several modern era high end high porsepower tuned luxury cars.
DOMINATOR - It may sound little different, more "higher-revving".
MARSHALL - My personal favourite of the list, fits godly onto the Brabus 850 S Coupe.
MONSTER - bit more muffled.
FACTION3 - Quite similar to MARSHALL, great sound though!
SLAMVAN - more raw, than SLAMVAN3
Lower-revving "calm" V8 - most ordinary stock V8 sound ever? These are very popular on common stock daily driver V8-s, not at all such raw, as the upper ones.
BLADE - although, the variation is probably the same as on some others in the list (VOODOO, if not mistaken), this is the most essential in the list for me.
BULLET - more quiet/lower rev
CONTENDER - more quiet/lower rev
LYNX - more higher rev/louder
PATRIOT - more quiet/lower rev