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#102 ·
Dealer quote (UK) the service bulletin is to address the surging at around 2500-3000 rpm that some people are experiencing on a constant throttle.
If you have this problem you will have to contact your dealer. Apparently my bike is eligible but I do not have this problem.
It will not have any effect on "snatchy" throttle response.
 
#103 ·
dekker said:
Dealer quote (UK) the service bulletin is to address the surging at around 2500-3000 rpm that some people are experiencing on a constant throttle.
If you have this problem you will have to contact your dealer. Apparently my bike is eligible but I do not have this problem.
It will not have any effect on "snatchy" throttle response.
Click to expand...
Told the same thing by the tech at my dealer, its to do with switching between closed and open loop maps at that rev range.
 
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#104 ·
Been in touch with Suzuki uk and told to contact my dealer,i have the F model and was registered in March 2016 ,but could have been built earlier, bike qualifies for ecu update, dealer has ordered ecu from Suzuki and will be in contact when it arrives, only cures fueling between 2500 and 3000 rpm but worth having done,not sure it will solve snatchy throttle,but hey still a great bike!
 
Discussion starter · #107 · (Edited)
walono said:
Been in touch with Suzuki uk and told to contact my dealer,i have the F model and was registered in March 2016 ,but could have been built earlier, bike qualifies for ecu update, dealer has ordered ecu from Suzuki and will be in contact when it arrives, only cures fueling between 2500 and 3000 rpm but worth having done,not sure it will solve snatchy throttle,but hey still a great bike!
Click to expand...
Talking to a dealer in perth and asked what the new ECU did that was different to original , his reply was ,don't know but the e-mail he received from suzuki said blah blah changes fuelling between 2000 and 4000 rpm.No change to throttle response but will affect fuel consumption figures, blah blah this makes a little more sense than curing the fuelling over the 500rpm range between 2500 and 3000rpm, that you were told , which would seem almost pointless.
 
#110 ·
Beaker said:
Your first service??
Crickey! You've done a lot of moaning for a bike that not done its first service yet. How do you know it's faulty and just not warmed up yet?

;)
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Been riding bikes for 40 years ol lad and I know when somethings not right....Suzuki are proving me right with all the replacment ECU's being sent out to dealers....>:D
 
#111 ·
tonyt said:
been riding bikes for 40 years ol lad. I'm old and slow ,my reactions are poor and i'm unable to train my brain to new things. I know when somethings not right and i make a point of moaning about it at every opportunity, it's an age thing...suzuki are proving me right with all the replacement ecu's being sent out to dealers and i'm **** well going to have one...>:d
Click to expand...
:d:d:d


0:)
 
Discussion starter · #113 · (Edited)
I fitted a G2 throttle tamer and found it really helped smooth out the ride in traffic, made it much easier to hold a constant speed , my dealer said my new ECU on the way and will hopefully be on next week , before i head off for a holiday down south with all the other ducks coz it's winter here. Thank god for heated grips.
PS if you fit them don't get the Suzuki ones , hopeless, got mine taken off and replaced with Oxford grips under warranty after complaining to Suzuki Aust. about originals.
 
#114 ·
Heads up

4tune8 said:
The original thread was suzuki is listening, however after reading many posts from other owners it would seem that the different distributers in other markets have varied reactions to our problem. It may just be a matter of perseverance on your part . Start with your dealer, some are proving helpful. Next go to the distributer, lastly try contacting Japan . Here is the original post......
After reading a post from Tobben who said his dealer replaced his ECU and that all the snatchy throttle problems were solved I contacted Suzuki Australia. I e-mailed them at 9.30am . I said that in Norway an owner was given a new upgraded ECU under warranty . That I was experiencing the same throttle problems and could they supply me with the new unit. At lunch time I received a call from my dealer. He informed me Suzuki had authorised him to fit the new ECU to my bike. He expected to have the part in a week or two and when it arrives he will make a time to fit it.So to anyone with a throttle problem , before you spend any money on a re- flash or PC5 try contacting Suzuki and asking for the new ECU. Tobben says after fitting his bike was transformed so I am confident that this will solve all the fuelling issues, and at no cost.
Click to expand...
Just had my 600 miles break in service today and cost $137 sweet. A good news for US GSX-S owners. The service manager from dealer i purchase the bike from has been in contact with Suzuki US WEST Representative. He told me today that suzuki will be putting out a service bulletin for the Snatchy problem. He said suzuki is aware of the problem worldwide . So it means to me that a fix is on the way they are probably trying to finalize setup to all suzuki dealers to make it right. Since i was the first to purchase my F model from dealership. He will notify me immediately when Bulletin comes out. So no ECU flashing for me yet. :D
 
#115 ·
Downshift said:
Image


New ECM is good, makes the ride much smoother, but it's not 100% fixed. Still some haunting around 2000-3000 rpm while riding constant. But the on-off response is much smoother and not abrupt. Very happy with the update.
Click to expand...
Hi

What did they do with the original K30 ECU.?

If they could give it to you, then could be handy as a potential aftermarket re-flash unit in the future
 
#117 ·
Jerky throttle response is just part of the GSXR heritage ... its a feature not an issue :) Ive owned four K7 750's over the past 10 years and they all did it. Here's a pretty good explanation as to why:


My bike is soooo smooth now. Anyone want to know how???


:D :D :D Well, read on.

I was a bit disappointed last week when I took the bike out for an evening spin. On a couple of occasions, on what I thought was a pretty steady slightly open throttle, the bike felt as though it stalled and I was jerked forwards. It was also really rough on overrun, so I decided I had to do something about it. After a bit of google research I found our problem. It effects pretty much all the recent FI models (Cars too, but with the extra mass and lower state of tune, it isn't so noticeable). The problem is that to meet emissions regulations and increase fuel economy, the ECU cuts the fuel injection when the throttle is closed and the engine speed is around 4k or higher (apart from when it is in neutral). The engine is effectively switched off and is being dragged by the bike's inertia. When the engine speed drops below 4k, the injectors come back on to allow idle. When the throttle is opened, the FI comes back on but there is a slight delay before the required fuel is pulsed into the throttle body. This is what causes the 'jerk'. Carbs on the other hand allow a constant trickle of fuel to provide idle.

If we can fool the ECU into thinking the throttle is open, and not switch off the FI, then we don't get the surge in fuel delivery. The ECU defines throttle position by the output from the TPS (Throttle Position Sensor). This is simply a potentiometer that varies the voltage depending on how far it is rotated. The initial 'closed' position is set up by human judgment, so this might explain why some bikes suffer worse than others. The good news is that, by careful re-adjustment, the ECU can be tricked onto thinking that the throttle remains just above idle so it doesn't shut down the fuel injectors. The bad news is that the TPS is a pig to get at.

I don't have time to go into detail right now, but to give you some more information on the fix, take a peek at this.

Ahhh, the good old herky jerky is gone with repeatable resulsts - Suzuki GSX-R Motorcycle Forums Gixxer.com

That refers to doing the job on a Gixxer 600/750. Its basically the same but you need to lift the tank and remove the airbox on the GSR. Even then its a real task getting to the TPS and you'll need a good quality anti tamper #25 torx bit. I bought a cheap one from the local car shop and it wouldn't touch it, but I was able to loosen it with a pair of longnose pliers, then I replaced the bolt with a standard hex head.

I also read on another site someone asking a Dynojet tunning centre is a powercommander and remap will cure FI throttle jerk. The response was that whilst a PC111 will help smooth out an emissions friendly map, it wont help fix FI cut-out snatch. Seems we have been barking up the wrong tree all the time.
 
#118 ·
holeshot408,

It's been my thought that this is why the throttle cable adjustment improves the situation. When you remove all the slack it must be moving the TPS and changing the value just before it starts to pull on the butterflies. The more bravely I went about this adjustment the better the situation got.

Do you agree or disagree?
 
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