Precision Turbo and Engine Precision Turbo & Engine PW39 Wastegate - Manual (Page 8)

PART NUMBER: PBO085-1000
NAME: PW39
DESCRIPTION: 39MM EXTERNAL WASTEGATE
Wastegate spring utilization chart
PSI BAR SPRINGS
Natural Yellow Red Green Blue
1.3 0.09 X
2.7 0.19 X
4 0.28 X X
5.6 0.39 X
6.9 0.48 X X
9.4 0.65 X
10.7 0.74 X X
12.1 0.83 X X
13.4 0.92 X X X
15 1.03 X X
16.3 1.12 X X X
18.8 1.30 X
19.5 1.34 X X
20.1 1.39 X X
22.8 1.57 X X X
24.4 1.68 X X
25.7 1.77 X X X
PSI Color
18.8 Blue
9.4 Green
5.6 Red
2.7 Yellow
1.3 Natural
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. Note: Each spring has a strip of
colored paint on one side, except the natural colored small inner spring.
Example: 1.5 psi Natural small spring + 6 psi Red medium spring + 18 psi Blue large spring = 25.5 psi.
WARNING: Installing higher spring rate springs into your PW39 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.
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