Suzuki GSX650F Forum - www.GSX650F.biz

The pc takes the info from the bikes sensors/ecu then changes them to 'trick' the bike into producing more torque/hp
For example say the reading from the ecu to the injector for quantity of fuel injected was 3 and this meant that the hp = 20, the PC would change this reading to be 8 so the hp = 40
This is a very very simple way of looking at it and there is way more to it than that, but it's a very rough idea.


I was more talking about those with a unrestricted bike using a pc to make even more torque/hp, not making the restricted bike come up to the output of the unrestricted bike.
I recon it would be very interesting argument with Suzuki if you installed a pc and capped torque/hp at exactly what the unrestricted bike made and they tried the "But the pc caused the problem due to making to much power." if something were to go wrong



As you need to tap into wiring to install the pc, any technician worth their salt will be able to tell you had one installed. The Suzuki ECU is quite a tricky bit of kit and with skillful use of SDS they may even be able to tell that way also. I'm certainly not saying don't do it, what I'm saying is that by taking it off doesn't make it look like it wasn't there kinda thing.



There are quite a few forums devoted to hacking ECU's and with the right gear, the right knowledge and some time you could retrieve the maps from your ECU (so you can store them and reload them later if need be) , wipe the ECU and reload maps from a unrestricted one (if you can get your hands on them) without a problem

The PC3 comes configured with all plugs required to just put it in line with the existing ECU. No splicing or tapping in to wiring is required. It appears to me that it's entirely possible to remove the device and return the bike to it's original state. The PC3 I purchased is specific to this bike. But more importantly I'm sure the bike can be returned to a restricted configuration should another learner care to purchase it, for example.

With a bit of luck I'll be off my learner license next month and will be able to provide more exact information then.

Cheers.

i have the two bro's juice box and what it does is it is basically an inline capacitor. Your ecu send electrical pulses to the fuel injectors to open up the valve and spray fuel. the new setup with the juice box is as follows: the wiring from the ecu to the clip to the juice box to the clip to the injector. its a simple install. and they give you an O2 sensor bypass clip.

Darrell, I hope you take this post the way it is intended - trying to pass on information

Have a read of the installation instructions (the document is 6 mb so it may take a bit of time) from Dynojet (the people who make the PC3. look at step 8 and figure D. This is the wiring tap I am talking of.

Keep in mind also that simply fitting the PC3 to your bike will not be the end. You will have to pay for (or get somehow) tuning time with someone that knows what they are doing, more than likely dyno time will be needed also.
This is because the PC3 and the maps they have on the site are for a unrestricted bike which puts out somewhere around 65kw. Your restricted bike put out about 25 kw.
The PC3 may add about 10-30 kw on top of the standard measure when you include an exhaust, air filter and some good tuning. This is to a standard bike.
You're already behind the 8 ball by being around 40 kw down to begin with.
Can the PC3 make up this kind of difference - I don't know and I am certainly very interested to find out if it can.

Don't get me wrong, I'm not trying to put you off. I'm trying to inform you of what you may encounter along the way.

cheers

Great info, thanks.

I've spoken to a few mechanics now who can do the dyno tune and they seem to think it's a good idea and will provide a great improvement. But like you say, I don't think anyone will really know until someone tries it. I'm happy to be the test case in about a month so stay tuned.

Have a read of this article from the UK.

http://www.telegraph.co.uk/motoring/mot ... ckage.html

It says that when the bike is purchased there you get an extra ECU at no extra cost to convert the bike when you want. Now why in the world can't Suzuki do that here? I'm not really impressed with their comments that it's an issue with getting government compliance and dealing with regulations. That's their job to deal with, not consumers. And given other manufacturers have done it here in Australia, then it's seems entirely possible.

It turns out that I only have to be on my unrestricted license for three months. Why in the world would anyone want to buy a bike they have to sell in just a few months if they want it to operate as designed? Future buyers are going to see these discussions and I still maintain that Suzuki is shooting themselves in the foot with this issue. It's a great bike and they have really hit the sweet spot for many riders, so why not put some energy in to resolving this issue for their Australian buyers?

Cheers.
.

Damn it, aussies always get shafted when it comes to extras and accesories. That second ECU at no charge is a brilliant idea.

Sure, Suzuki had to prove to who ever that the bike when sold as a LAMS compliant bike has the restrictions. However, once you are legally allowed to ride a unrestricted bike, you don't have the option of plugging in the full power ECU and be done with it.

My restrictions will be lifted in December this year and I've bought a few accesories that I would like to keep and use for years to come. Mainly being the top box and panniers. I could quite happily keep my current bike for a while, but it would be better if I had the option of a full powered bike.

Bugger this talk about restricted bikes, I'm going for a ride

Well I had my bike dyno tuned today after installing a power commander to see if I could reclaim some of the power that is clipped by the ECU on Australian restricted versions of the GSX650F.

The result was only a 10% improvement in power output. While the bike certainly runs better after going to a Yoshi exhaust, power commander and having it tuned there is no gain in regards to going past the restrictions that the ECU places on the performance.

I had this confirmed by the mechanic and power commander tech support as well.

The mechanic said that you can order ECUs and he thought that would work. But the cost is over $US1,000 so I won't be trying that out. Hopefully eventually someone will come up with a hack to the ECU.

So I'll enjoy my restricted GSX650F until I get off my P license and then it's off to the shops to buy a full power bike other than a Suzuki.

Cheers.

Do you have graphs by any chance. If you could post em up if you do that would be great as I'm interested to see the results. Then again 10% change is only another 2-3 kw. still interested if you have em.

bummer that you didn't get the results you were after specially considering the effort and $$$ you went to.

Maybe consider getting a unrestricted ECU (that brings with it more problems with the rego people tho I recon) or trading to a full pony GSXF as now you have the nice bits to put on it. You never know , pipe + PC3 + air filter (if you get one) might even add up to 100 hp

I've got hard copy. Next time I'm near a scanner I'll scan it and send a copy to the forum.

About all I could offer other Aussies is that if they have a power commander and Yoshi pipe on a restricted version of the bike they can have a copy of my map if they want it. But I'm assuming that no one else has tried the power commander yet and after my experience I don't see any reason for them to.

Cheers.

Here's a photo that I took of the graph. I think it's clear enough to see the results but let me know if you want a clearer copy as I can scan it instead:

I find it interesting that your power curve (stock one) is about on par with a full pony bike up until just before 5000 rpm
It seams as if this is the point Suzuki limit the bike.
It will be very interesting to find out how Suzuki limit the bike from this point whether it be fuel, ignition or a combination of both (combo I recon)

Out of interest have you tried disconnecting the GP switch to see what happens.(well it's actually cutting the pink wire but disconnecting is a test that can be reversed easily)
I understand on the Busa it removes the top speed limit and I know on the bandit it give a little more low end grunt to the bike.

that the PC3 didn't work out for you in any case.

just out of curiosity, does the power commander also alter ignition timing as well? had a quick (like 20s) look at the site and i get the feeling it doesn't. if it doesn't i'll guarentee that's why you aren't getting up to the unrestricted results