Join Date: Jan 2016
Location: Melbourne, Australia.
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Power Commander on GSX-S1000 and dyno sheet
I have had my GSX-S since October and have recently joined the forum after reading a lot of posts about "snappy throttle" and hard to get "constant throttle". I was a mechanic for a number of years and my new GSX-S dissapointed me from the start with regards to the characteristics of the motor. It was nearly dangerous on rough roads (and Aus has lots of these) due to the snatchy throttle, I was always chasing the throttle to keep a constant speed and not get caught by one of our speed cameras, the idle was inconsistent and it displayed symptoms of being excessively lean until it hit the go button at around 7,000 rpm.
Being a mechanic I had to fix all these things that were bugging me, I like my bikes perfect and are renown for my patience when sorting a bike out.
I took my GSX-S to DeWith Motorsport (Mick DeWith is a great friend of mine) and ran it up on the dyno and found the bike to be very lean up to 8,000 rpm. Just what I suspected. It's 138.6 HP was far below the advertised Suzuki figure so I was justified in complaining that the bike was a bit weak.
I fitted a Power Commander 5 that had a map in it for the GSX-S1000 but that made very little difference so we began the process of manually mapping the fuel through the Power Commander. 44 dyno runs later and we had roughed out a starting map which gave me a 4 to 8 HP gain right through the rev range with a top output of 146.8 HP. Now I was getting what the Suzuki advertising told me.
On test riding, the throttle was much smoother, the bike would pull hard in any gear and hold a constant throttle. I did not move my hand once in 20kms @ 100KPH on the highway, it had never done that before. There was no big rush at 7,000 rpm plus as the bike now had power all the way to 7,000 rpm and the bottom, middle and top matched each other. There was no jerkiness at city traffic speeds.
I have not touched the low throttle openings yet and have only roughed in a fuel map. I will spend another day fine tuning the bike when I can get some more dyno time.
I have some other tuning mods to do as well and will report back on them.
Does anyone know what happens around 7,000 rpm, do the secondary throttle butterflies or the exhaust flapper open then, does some electronic thisg happen at 7,000 rpm. It is very tricky to tune around 7,000 rpm. I will find it but someone may be able to save me the effort. You can see it in both the dyno curves and the power commander does not respond very well at that range.
My bike is stock as a rock except for the Power Commander and I reckon you're better off buying a Power Commander than an aftermarket slip on muffler. How many mufflers quote a 4 plus HP increase right throughout the rev range and make the bike far more rideable in all situations.
The fuel mapping seems to be the solution to a lot of the issues discussed in this forum. I hope this post has helped a few people.
Also the exhaust note changed dramatically, it's now deeper.
I have already tried to upload the map last night and failed, I hope it works this time. The stock dyno run is in red, the one after a days day's mapping with the Power Commander 5 is in black. Each line is equal to 4 HP on the verticle scale.
I took videos of the GSX-S on the dyno and will edit out all the garbage and submit it soon so you can hear a GSX-S at full throttle.
Cheers from Aus