Flat spot when running a pipe and filter:

Cuprinol Man

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Hi guys.

I am running a full BOS system on my 57 plate 12GS with a K&N filter.
It has a flat spot around 3.5K but clears higher up the rev range.
Does anyone know how I can get rid of it other than putting it back to standard?
I would prefer to take it to someone to get it set up but not sure if traditional tuners can work on CANBUS wiring.
Regards
CM
 
sounds like it needs a power commander and some dyno time.
 
Manufacturers tune a lean spot in a rev range to pass emmisions tests. As the previous poster has advised, the only way is a power commander & dyno time or return the intake system to original.
 
Performance Controller

As far as i know Power Commander don't make a unit for the GS/ GSA 1200 yet. However Wunderlich sell a Performance Controller which will allow you modify the fuelling. Can be bought direct from Wunderlich or Nippy Normans, Wunderlich catalog part number 8530120


Just for info the unit is manufactured by Techlusion in the USA but Wunderlich have the exclusive distribution rights for Europe until Jan 2008( not sure if this is already extended or not). However there is nothing to stop you ordering from an american supplier on the internet and importing it yourself.
http://www.customdynamics.com/motor.../techlusion_fuel_injection_control_module.htm
Might work out cheaper with the Dollar currently competing with Loo paper in value.:augie


The model you need is FI-1334ST. I have one fitted to my 06 GSA with the same pipe and filter as you and it sorts the problem out. Its also easy to programme ( recommended settings included)and is a simple "plug and Play" item. Alternatively you can go to your local tuning shop and pay for some Dyno time.

Unlike a Power commander it cannot reduce fuelling or alter the ignition timing. It can only add fuel and is therefore safe in so far as the engine will never run lean. When turned off the original mapping is in use. Hope the info is of help.


Cheers:thumb
 
BOS works fine on its own but I am tempted to go with the air/fuelling mods...
Maybe next year.....:augie
 
Cuprinol Man said:
Hi guys.

I am running a full BOS system on my 57 plate 12GS with a K&N filter.
It has a flat spot around 3.5K but clears higher up the rev range.
Does anyone know how I can get rid of it other than putting it back to standard?
I would prefer to take it to someone to get it set up but not sure if traditional tuners can work on CANBUS wiring.
Regards
CM
Click to expand...

I had the full BOS system on my last 12gs and it didn't have the flat spot you described. The system is designed so it doesn't need a power controller or dyno time. Lose the K&N and see how you get on.
Out of interest - I thought the BOS system only fitted the 04/05 bikes because of the centre stand shape - how'd you get round this?
 
For the sake of any real world tiny increase in power / performance why not just keep it standard? Sell the 'stuff' on ebay and spend the money on another trip!:rob

Or.............if you want to be different and 'build' something a bit special along the lines of a GS why not have a look at HPN in Germany.:thumb
 
davidgibson999 said:
I had the full BOS system on my last 12gs and it didn't have the flat spot you described. The system is designed so it doesn't need a power controller or dyno time. Lose the K&N and see how you get on.
Out of interest - I thought the BOS system only fitted the 04/05 bikes because of the centre stand shape - how'd you get round this?
Click to expand...

The earlier systems did not fit later bikes but they have modified the design so they now fit all years. It is worth pointing out though that if you put an 06 system on an earlier model bike the centre stand stop is in the wrong place.
 
CityBum said:
I have exactly the same set up on my '06 1200GS, with the bOS bafles fitted. Ther are no flat spots since fitting.

Are you running with or without the baffle?
Click to expand...

I am running it without the baffle in.

I am gonna try it with it in and with the K&N off and combinations of both.

Cheers.
 
Jon P said:
For the sake of any real world tiny increase in power / performance why not just keep it standard? Sell the 'stuff' on ebay and spend the money on another trip!:rob

Or.............if you want to be different and 'build' something a bit special along the lines of a GS why not have a look at HPN in Germany.:thumb
Click to expand...

You are right in what your saying, the increases are only small.
The reason for doing it though is the extra torque (not bhp) is noticalbe and they will now wheelie over brows and small rises.
Not superbike straight up 130mph jobbies just small ones that make you chuckle.
Plus I had the same system on a 05 12GS beforehand. When was the last time you could do that on a sportsbike, and get a full performance system for £350?
 
Cuprinol Man said:
You are right in what your saying, the increases are only small.
The reason for doing it though is the extra torque (not bhp) is noticalbe and they will now wheelie over brows and small rises.
Not superbike straight up 130mph jobbies just small ones that make you chuckle.
Plus I had the same system on a 05 12GS beforehand. When was the last time you could do that on a sportsbike, and get a full performance system for £350?
Click to expand...

Power is a result of torque - you can't have one without the other. I still think you'll find that any change is mostly imagined........

Laws of physics reminds us that you can't have something for nothing - if you really want to make a change you need to do more than change an exhaust / air filter. When designed by BMW there are so many factors invloved in perforamnce, from ignition timing, compression, valve timing / overap / opening range and duration, fuel supply, operating temperature, bore /stroke relationship.............to make a true difference you need to change all of these things.......anything else is just fiddling!........

Comparative data collected from many sources over many years show this to be true time and time again.

....come on guys, 'fess up and admit that on road bikes it's just a fashion thing!:augie Who can forget an SS50 at full chat with an exhaust opened up?
 
Jon P said:
When designed by BMW there are so many factors invloved in perforamnce, from ignition timing, compression, valve timing / overap / opening range and duration, fuel supply, operating temperature, bore /stroke relationship.............to make a true difference you need to change all of these things.......anything else is just fiddling!........

Comparative data collected from many sources over many years show this to be true time and time again.
Click to expand...

You left off one design consideration and one that adversley affects the performance of modern motorcycle engines, namely emissions and (to a lesser extent) noise regulations.

'Fiddling' to the extent of a pipe and filter and better still a fuel controller goes a very long way to overcoming the compromises made to achieve these and you have a sweeter riding bike, nothing to do with outright top end power or being the noisiest bike on the block, just a bike with no flat spots, lower down tractability and a fatter midrange.

You can argue whether the gain v cost is worth it but that's very subjective anyway. What you can't argue with is the very real difference it makes to the R1200 engine :thumb2

Andres
 
Bolt on, without any other changes or tweaks, my bike runs better & is noticably (seat of the pants) quicker with the full BOS system fitted... :nenau
 
Outtomunch said:
You left off one design consideration and one that adversley affects the performance of modern motorcycle engines, namely emissions and (to a lesser extent) noise regulations.

'Fiddling' to the extent of a pipe and filter and better still a fuel controller goes a very long way to overcoming the compromises made to achieve these and you have a sweeter riding bike, nothing to do with outright top end power or being the noisiest bike on the block, just a bike with no flat spots, lower down tractability and a fatter midrange.

You can argue whether the gain v cost is worth it but that's very subjective anyway. What you can't argue with is the very real difference it makes to the R1200 engine :thumb2

Andres
Click to expand...

Sorry, but I didn't mention any design considerations - purely mechanical components. Emissions has always been a consideration - sure there are always power characteristics associated with the 'tune' of any motor and I am aware that a lot of folks try and get around these with modifications of one form or another.........remember blue HT leads, oil additives, open air filters.

I don't have an aftermarket pipe (or associated extras) on my bike. I tend to leave them alone and enjoy them as they are...........as you mention cost vs gain is an endless debate.

Maybe I am too tight to splash out on extras when the bike came complete when I bought it!:augie
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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