Suzuki GSX R 1000 Page 16
INTAKE AND EXHAUST CONTROL
AND ENGINE MANEGEMENT SYSTEM
Intake and Exhaust Control and Engine Management Systems
3-1
3. Intake and Exhaust Control and Engine Management Systems
1) Overview
The GSX-R1000's already-advanced, digitally controlled engine management, fuel injection and
exhaust systems have been improved for 2003.
An upgraded digital ECM (engine control module) features a 32-bit CPU instead of the previous
model's 16-bit CPU, with an increase in ROM (read-only memory) from 96 kilobytes to 256
kilobytes. The CPU upgrades allow the ECM to calculate fuel injection volume and ignition timing
more quickly and in more detail, adding combustion efficiency and throttle response and also
reducing exhaust emissions. To work with the upgraded CPU, the engine rpm sensor is more
accurate, now using a 22-pole signal generator instead of the previous model's 8-pole signal
generator.
New, dual double-barrel throttle bodies replace the previous model's four single-barrel throttle
bodies. The new throttle bodies and injectors reduce weight by about 372 grams.
The new throttle bodies incorporate the revolutionary Suzuki dual throttle valve (SDTV) system
used on the 2001 GSX-R1000 model, contributing to combustion efficiency while aiding throttle
response and smoothing power delivery.
Each throttle body throat carries a single fuel injector precisely positioned at a steep, 60-degree
angle relative to the throttle-body centerline. The result is a more homogenous intake charge--
and more efficient combustion--across the range of throttle openings.
The engine management system also controls the SET (Suzuki Exhaust Tuning) butterfly valve
located in the pipe between the collector and the muffler, via a servo motor. The SET valve
matches exhaust system back pressure (also known as exhaust pressure waves) to engine
speed, throttle position and gear selection.
While the 2002 GSX-R1000 exhaust system combined titanium head pipes and a titanium
collector with a stainless pipe between the collector and the muffler, the 2003 model's exhaust
system is made entirely of titanium, reducing weight by about 600 grams.
Instead of bowing to current fashion trends, the GSX-R1000 muffler is still built using titanium core
pipes and a titanium end plate with an aluminum-alloy outside cover. Competitors bragging about
all-titanium mufflers are advertising fashion over function, since an all-titanium muffler weighs
about 300 grams more than an equivalent muffler combining a titanium core and an aluminum-
alloy outside cover.
The GSX-R1000 muffler itself is 10mm larger in outside diameter and 100 mm longer for 2003.
The increase in internal muffler volume produces improved flow and contributes to efficient power
production, without increasing noise levels.
