Suzuki GSX-S Engines

Suzuki GSX-S Engines


Suzuki GSX-S Engines, This engine is an updated, retuned version of the famous Suzuki GSX-R1000 K5 engine, arguably the best sports-bike engine ever, the K5 (as well as K6 and K7 models, which used an identical engine) utilized a long-stroke engine design that provided quick-revving midrange torque in addition to a top-end punch that helped the then-latest Suzuki stave off a very capable literbike field to win nearly ever comparison test it entered.   

This version produces 143bhp and 78 ft.lbs of torque.

The GSX-S1000 is powered by a street-tuned version of the four-stroke, liquid-cooled, DOHC, 999cm3 , inline-four engine that became a legend in the 2005–2008 GSX-R1000. The newly honed engine delivers smooth throttle response and immediate, controlled acceleration, so the sport rider experiences adrenaline-rushing performance.

Suzuki GSX-S Engines

Engine Modifications

Re-flashing the ECU

Throttle Fix

Improved Throttle

PAIR Valve


Exhaust System and Inlet

Standard Dyno chart for stock GSX-S1000 vs GXS-R1000 K5

Suzuki GSX-S1000 Dyno

The GSX-R1000 K5 has a much smoother curve with both more torque and more power, so various mods can be made to the GSX-S1000 to improve the curve and increase power and torque.  The drops in the torque curve are caused by Euro 4 emissions, in order to meet the emissions (both gas and noise) there is a constricting Catalytic converter and large muffler, and to fit these the exhaust design is compromised, added to which is a valve in the exhaust to keep the noise down, these all add to the drop in torque at 5-6000 rpm.  A replacement exhaust with less restrictions and tuned headers can smooth out the toque curve

At the top end, power is restricted by the much lower rpm limit, 11,400 vs 13,100rpm. The rev limit can be modified by re-flashing.  Other mods to increase torque and power are increasing compression ratio, different cams.

With some simple mods the GSX-S1000 can achieve 160+bhp at the rear wheel.

This dyno sheet is a stock GSX-S1000 that has just been mapped and flashed on a dyno, 12 bhp increase at rear wheel

stock flashed GSXS1000 dyno

Suzuki GSX-S1000 vs BMW S1000RR on the dyno, the BMW engine was developed from the GSXR1000 K5 engine, as you can see almost identical curves until 10,000rpm when the superior breathing of the BMW pulls away significantly

GSX-S1000 vs S1000RR dyno

custom exhaust GSXS dyno

This is a GSXS1000 with a full exhaust designed to fill in the hole in the torque and reflashed to produce a smoother higher torque curve and more power



Inherited directly from a GSX-R supersport machine, the Suzuki GSX-S750 has the powerful 749cm3 four-cylinder fuel-injected engine that is specially tuned and refined to maximize its potential on the streets and on winding roads. Cutting-edge technologies from the legendary Suzuki GSX-R series control engine management.

This version produces 114bhp and 59 ft.lbs of torque.

Not so much information on tuning the 2017-18 GSX-S750 but I will soon be flashing one myself – plenty of exhausts becoming available

GSX-S750 Yoshimura slip on dyno


GSX-S750 Arrow full system Dyno