Section 08 COOLING SYSTEM
Subsection 01 (COMPONENTS AND CIRCUIT)
Elbow Fitting
Water injection used on exhaust system cools the
exhaust gases to obtain maximum performance
from the tuned pipe. The elbow fitting no. 1 has
a calibrated inside diameter to optimize water flow
in tuned pipe.
The water injection also helps in reducing noise
level and cools components of the exhaust sys-
tem.
CAUTION: The elbow fittings are calibrated and
can not be interchanged with one of a different
size as severe engine damage could result.
The elbow fitting can be identified by using the
number stamped onto the fitting or by measuring
its inside diameter. Refer to the following illustra-
tion and chart.
16
A
1
B
F00E04A
1. Stamped number
A. Outlet diameter = 4.6 mm (.181 in)
B. Inlet diameter = 5.5 mm (.219 in)
STAMPED
NUMBER
ON
FITTING
FITTING
P/N
INLET
DIAMETER
OUTLET
DIAMETER
18 293 710 018
4.0 mm
(.157 in)
5.5 mm
(.217 in)
23 293 700 023
8.5 mm
(.374 in)
8.7 mm
(.343 in)
Water Flow Regulator Valve
GTI Models with 787 RFI Engines
A water flow regulator valve is mounted on these
models so that they can produce the maximum
horsepower output and yet maintain the neces-
sary diameter of the injection fitting at the tuned
pipe head for unobstructed water flow.
The water flow regulator valve no. 2 is mounted
directly onto the muffler.
F01E1FA
1 2
3
TYPICAL
1. Water supply hose of regulator valve
2. Regulated water to injection fitting
3. Water injected into the muffler
NOTE: The water injected into the muffler is not
regulated by the tapered needle of the valve. In-
stead, a calibrated water injection fitting no. 5 con-
trols water flow into the muffler. The GTI RFI and
GTI RFI LE models use an injection fitting with an
opening of 4.5 mm (.177 in).
The water flow regulator valve has a calibrated
spring and a tapered needle which regulate the in-
jected water in the tuned pipe.
CAUTION: Do not change anything on the wa-
ter flow regulator valve, otherwise serious en-
gine damage can occur. In many countries it is
illegal to tamper with this valve as this will af-
fect the EPA certification.
At low speed, water pressure in the supply hose
of the regulator valve is not sufficient to overcome
the spring of the regulator valve; more water is
being delivered to the injection fitting at the tuned
pipe.
smr2005-061 229
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