Clutch switch, removed? - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 25 (permalink) Old 12-22-2016, 01:24 AM Thread Starter
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Clutch switch, removed?

Can I remove the clutch switch on my clutch perch and bridge it?

Ive just fitted a riser clipon and it doesnt allow the perch to twist as low as I like it.
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post #2 of 25 (permalink) Old 12-22-2016, 04:32 AM
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Re: Clutch switch, removed?

You can, but it would be a very bad idea. The ECU would assume it's constantly operating the motor without load and run the engine accordingly (use different maps, perhaps a lower rev limiter, etc.). You don't want that when you're not in neutral, or have the clutch pulled in. Do a search for "neutral switch" for more details; there are plenty of threads describing the effects.
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post #3 of 25 (permalink) Old 12-22-2016, 09:39 PM Thread Starter
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Re: Clutch switch, removed?

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Originally Posted by dpapavas View Post
You can, but it would be a very bad idea. The ECU would assume it's constantly operating the motor without load and run the engine accordingly (use different maps, perhaps a lower rev limiter, etc.). You don't want that when you're not in neutral, or have the clutch pulled in. Do a search for "neutral switch" for more details; there are plenty of threads describing the effects.
Hey thanks Mate.

Ive done it on other older bikes with no problem. But searched like you suggested and found a big thread on it. Looks like there is a way to set up a relay to delete the switch. This close to Christmas im not going to the shops. LOL

So Ive bridged in a brake lever switch that works opposite to the clutch switch and cable tied it to the bar. I have to push it to start the bike. Rough but it will work until Jan when I have time to wire in the relay.
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post #4 of 25 (permalink) Old 12-24-2016, 12:26 AM Thread Starter
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Re: Clutch switch, removed?

Now here is an odd thing.

I have the button set up. Bike starts fine with it pushed. But I thought I wonder if I need to push the button from time to time. So I tried it.

Riding down the road, I push the button. The bike accelerates slightly. Does it every time. My guess is it opens the secondry butterflys and throws a bit of fuel in.
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post #5 of 25 (permalink) Old 12-24-2016, 04:41 AM
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Re: Clutch switch, removed?

So you're going at constant speed and you close the clutch switch and the engine accelerates slightly? Does it accelerate momentarily or is there a steady acceleration until it settles at a higher speed?
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post #6 of 25 (permalink) Old 12-24-2016, 05:04 AM
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Re: Clutch switch, removed?

You basically switch between neutral and gear maps. There's a quite big difference on ignition maps, STP maps are the same...
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post #7 of 25 (permalink) Old 12-24-2016, 08:16 AM
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Re: Clutch switch, removed?

Wouldn't one expect neutral maps to be tuned for lower performance though?
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post #8 of 25 (permalink) Old 12-25-2016, 10:17 AM
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Re: Clutch switch, removed?

It depends on which gear the op was riding.

See the attached neutral, group 1 and group 3 ignition maps. Group 2 maps are the same as group 1.
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post #9 of 25 (permalink) Old 12-25-2016, 01:17 PM
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Re: Clutch switch, removed?

Thanks for the data JK750. It's a little hard to judge from the surface plots, but it does seem like the neutral maps might have more advance in certain areas that would tend to cancel the retardation introduced in the group 1 maps, with respect to the group 3 maps.

Incidentally, since the matter of maps came up (sorry for the slight hijacking OP), I was wondering what other maps have groups and particularly which have differences between the groups, or, in other words what engine control parameters are affected by gear? For instance, do the STVA maps change between gears?

Also, looking at the maps, I have formed the hypothesis, that those regions of almost 90 advance, which furthermore develops very suddenly, must correspond to fuel cutoff, as that's the only case I can think of, where so much advance would be tolerable. Do you think that's likely?
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post #10 of 25 (permalink) Old 12-25-2016, 07:18 PM Thread Starter
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Re: Clutch switch, removed?

No worries about the hijack as this is interesting, more than me wanting to move my clutch lever.

My first thought, oh can I turn this into a auto blipper. LOL
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post #11 of 25 (permalink) Old 12-25-2016, 08:38 PM
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Re: Clutch switch, removed?

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Originally Posted by NZSpokes View Post
No worries about the hijack as this is interesting, more than me wanting to move my clutch lever.

My first thought, oh can I turn this into a auto blipper. LOL
I have an older bike gen, where it does not matter, but is it not/ (wouldn't it have been possible to integrate this all into one movement?.......right at the shift point?) A little revision...Maybe....clutch switch/shift right at your foot? Whatevs...LOL.....Thinking out loud in typed form.
Merry Christmas Fagbags!!!!dunno
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post #12 of 25 (permalink) Old 01-05-2017, 09:49 PM
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Re: Clutch switch, removed?

I have never tried it, or thought about it.

But, did you get your bike's performance increased doing so?
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post #13 of 25 (permalink) Old 01-07-2017, 01:33 AM Thread Starter
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Re: Clutch switch, removed?

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I have never tried it, or thought about it.

But, did you get your bike's performance increased doing so?
Ive only done it to suit my new clip ons.

Have done the relay mod now and it works a treat.
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post #14 of 25 (permalink) Old 01-09-2017, 02:20 AM Thread Starter
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Re: Clutch switch, removed?

Well that didnt work out so well. The bike throws a FI light now with a C40 code. From what I have found on google its a ISC fault caused by the clutch switch.

Now Im confused as the bike starts fine.
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post #15 of 25 (permalink) Old 01-09-2017, 03:01 AM Thread Starter
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Re: Clutch switch, removed?

Bit more reading and found this on another site, my bike is an 09.

As an update, this configuration does not work with a 2011 GSXR75. This specific relay has a drop out of >=1.2v and a pick up of <=7.2v. On my starter wire when the bike is running it has roughly 3.5v on that wire creating an always closed switch and therefore leading to the limp fuel map. This could be a specific problem to my bike, however I doubt it since I bought this bike with 300 miles on it and it had almost nothing done to it other then a windscreen and fender eliminator kit. If it is getting its volts back fed from somewhere else I'd be surprised and wouldn't even be sure where to start to trace that... Seems to me if I could find an automotive relay with a drop out of 5v and a Pick up of 10v I'd be golden.

Any suggestions would be appreciated since this configuration seems to work for many people here.
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post #16 of 25 (permalink) Old 01-09-2017, 05:19 AM
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Re: Clutch switch, removed?

What exactly is your clutch switch setup?
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post #17 of 25 (permalink) Old 01-09-2017, 11:32 AM Thread Starter
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Re: Clutch switch, removed?

I used a relay fired by the starter switch.
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post #18 of 25 (permalink) Old 01-09-2017, 05:17 PM
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Re: Clutch switch, removed?

IMHO, I'd put the stock clip on's back on.
My bike came with an aftermarket top triple, and some low rising Renthal FatBoy bars on it.
The seller also gave me the stock triple and clip on's which wnet back on within a week.

I'm PM'ing you about the bars, in case you may want them.
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post #19 of 25 (permalink) Old 01-09-2017, 05:31 PM
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Re: Clutch switch, removed?

What is interfering such that you cannot twist the perch low enough?
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post #20 of 25 (permalink) Old 01-10-2017, 12:45 AM Thread Starter
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Re: Clutch switch, removed?

Quote:
Originally Posted by Just_Nick View Post
What is interfering such that you cannot twist the perch low enough?
Im using a riser clipon and it fouls with the riser part of the bar.

Ive checked the voltage at the relay and it stays at .3v untill the starter switch is hit. Ive changed back to the switch system to see if the fault is still there.
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