[RRuger]

You might try;

[common]
mode relobj pos
type mixer
infinite 1
EAXMix 0
occlusion -200
occllf 0.25
eaxroom 100
obstruction -200
obstrlf 0.25

mutable 1

[spl]
110 ← change this value
[samples]
air_start_00.wav
Wright_Cyclone_1000.wav
Wright_Cyclone_1500.wav
Wright_Cyclone_2000.wav
Wright_Cyclone_2700.wav
Wright_Cyclone_2701.wav
xWright_Cyclone_1000.wav
xWright_Cyclone_1500.wav
xWright_Cyclone_2000.wav
xWright_Cyclone_2700.wav
xWright_Cyclone_2701.wav
M82_dmg.wav
1.wav
x2.wav

[sample.air_start_00.wav]
infinite 1
controls rpm start

[sample.air_start_00.wav.rpm]
minlo 20
minhi 30
maxlo 150
maxhi 250
value 0.5
pmin 0.6
pmax 1.8