Wastegate spring utilization chart
PSI
BAR
SPRINGS
Natural
Yellow
Red
Green
Blue
0.9
0.06
X
1.8
0.12
X
2.7
0.19
X
X
2.9
0.20
X
3.8
0.26
X
X
6.3
0.43
X
7.2
0.50
X
X
8.1
0.56
X
X
9
0.62
X
X
X
9.2
0.63
X
X
10.1
0.70
X
X
X
12.8
0.88
X
13.7
0.94
X
X
14.6
1.01
X
X
15.5
1.07
X
X
X
15.7
1.08
X
X
16.6
1.14
X
X
X
NOTES:
The use of 2 or 3 springs in combination are required for higher boost levels. When selecting your
spring rate, the total boost psi pressure is determined by adding the springs rates together. Use the chart
above to determine your spring combination needed for your boost psi. Exact boost level can vary due to
combinations or ambient conditions. Each spring has a strip of colored paint on one side, except the
natural colored small inner spring.
Example: Natural small Red medium Blue large spring = 16.6 psi.
WARNING: Installing higher spring rate springs into your PW66 wastegate, may cause higher than
expected boost levels. It is recommended to reduce your boost controller back to its minimum setting, and
monitor your new minimum boost level with the new spring or springs, before increasing your boost
pressure. Failure to do so can lead to severe detonation and engine damage. Any damage incurred, as a
result of detonation from excessive high boost levels or improper installation is the customer’s
responsibility. Precision Turbo recommends that the air/fuel ratio be checked while setting the boost levels,
as raising your boost levels will change your air/fuel ratio of your tune up and could cause engine
detonation or damage.
8
PART NUMBER:
PBO085-3000
NAME:
PW66
DESCRIPTION:
66MM EXTERNAL WASTEGATE
PSI
COLOR
SIZE
1.5
NATURAL
SMALL INNER
3
YELLOW
MEDIUM OUTER
6
RED
MEDIUM OUTER
9
GREEN
LARGE OUTER
18
BLUE
LARGE OUTER
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