GSXR 1100 M Dyno Charts

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Suzuki GSX R 1100M

The chart above shows the difference after the first engine rebuild .

The blue line shows the best run after a stock tune up . the spec was stock M 1127cc motor, dynojet stg 1 Kit ,K&N air filter in std air box , full micron 4:2:1 system & race can.

Result = peak of 126 bhp @ wheel

The red line shows the best run after the rebuild . additional spec is - wiseco 1186 big bore kit , cylinder head reworked by Roger Upperton Racing ,including oversize inlet valves , fueling altered to suit, still with stock M cams , but dialed in at 107 / 107 using slotted sprockets.

Result = peak of 153bhp @ wheel

About 18 months after the above chart , the engine blew up in a spectacular fashion .The crank snapped in two at full chat in 5th gear ( about 160mph ! ) the resulting vibration nearly threw me off the bike as well as putting stress fractures in all of the wiseco 1186cc pistons .

A new engine was sourced ( from an 800 mile old Bandit 1200 ) , and was beefed up with a new wiseco 1216cc big bore kit ( courtesy of wiseco - the cracked 1186 pistons were replaced under warranty !) , the old M head was sold ( because it's hard to get uprated cams for the 'shim' type heads ) and the new bandit 12 head was sent back to Roger for a full gasflow job . All the other goodies were ripped out of the old M motor ( see spec here ) and pressed into service in the new motor. I got a set of Kent SUZ 1 ( race profile ) cams , dialed them in & took it to the dyno.

As you can see on the chart , the effect of the SUZ1(race) cams was very poor - even though the fueling was not matched to the new cams , it was evident that there was a serious lack of power from somewhere . I then fitted stock B12 cams and ran it on the dyno again . The result was more power ! It proved i was right to suspect the SUZ1 cams as the culprit , so i whipped out the bandit cams and fitted a set of GSXR cams from an old 750H - I immediately picked up an extra 13bhp over the so called 'race cams' ! - I sent the SUZ1 cams back to Kent Camshafts , and they replaced them with a pair of SUZ 7 ( fast road ) cams. I fitted these , and after dialing them in , and adjusting the fueling - we were in business . It recorded a peak of 148bhp & 92ftlb of torque .

Initially , you would expect the 1216 bandit motor to give more power than the 1186 'M' engine . In truth they felt exactly the same . The M engine did have oversize valves and a better flowing cylinder head though , and in any case it is unfair to compare the 'numbers' as they were tested on different dyno's and by different operators. It's 'my' opinion that it's all 'pub talk' anyway .Yes - dyno's are excellent tools for fine tuning the fueling and diagnosing potential problems , and are great for measuring the effect of changes you make to the engine ( as long as you use the same dyno ! ).My bikes are used regularly on the road - so I don't get too hung up on chasing 'the absolute peak' - the most important thing is how the engine delivers its performance. It's better to sacrifice a couple of peak 'horses and have an engine that pull's like a train from low rpm all the way to the redline , than just concentrate solely on producing 'big numbers' - you'll end up with a motor that is gutless below 9000 rpm , and because you have to rev the tit's off it , to get at the power - it wont last very long either.

Thanks to Craig Taylor of Dyno Torque (Birmingham) Tel. 0121 772 2453

GSX R 1100M

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