2011 R1200GSA struggling to accelerate at high rpm problem!!

[botus]

my understanding was it didn't like to rev out in a lively manner, not it was OK but dead sometimes around 6k?

makes sure the TC is out of the question or you never know what's going on, and if the rear ABS sensor is dying TC will go mental

strange with the sensors off you see improvement. The whole idea with the Italian box is you can leave it all plugged in. On the PCV or PC111, you must disconnect the lambda sensors or the bike and the power commander argue.

has the box died and its running funny, take off the sensors and it runs a basic fall back map???

 

[Moonmanzn]

my understanding was it didn't like to rev out in a lively manner, not it was OK but dead sometimes around 6k?

makes sure the TC is out of the question or you never know what's going on, and if the rear ABS sensor is dying TC will go mental

strange with the sensors off you see improvement. The whole idea with the Italian box is you can leave it all plugged in. On the PCV or PC111, you must disconnect the lambda sensors or the bike and the power commander argue.

has the box died and its running funny, take off the sensors and it runs a basic fall back map???

No you where correct, it rides fine up until I'm in 5th or 6th and around 6000rpm and holding a set speed then try to accelerate. It then has the flat/holding back feeling and will accelerate past if I slowly roll on the throttle.

I have taken the box out the equation and it doesnt remedy the fault. Only thing that had made a difference is unplugging O2 sensors.

 

[botus]

found the other post on diff forum where his fuel pressure regulator was causing over fuelling on same ECU, but in 4 cyl application... calling the system alpha N... which it turns out is a cheap nasty way to do injection that's very rudimental and most people struggle getting it to tune well. AKA the base map for limp mode on cars

Alpha-N is also sometimes called “TPS maps” because the only sensor that is used for determination of fueling is the Throttle Position Sensor and RPM. Fuel and timing requirements for the engine are expressed as a function of RPM and TPS.

Alpha-N is used most of the time in tricky situations:
1.When the MAP sensor or MAF sensor has failed and the primary control strategy is deemed to be invalid. Something-is-better-than-nothing is the idea bringing in limp mode
2.In conjunction with Individual Throttle Bodies due to the extremely low vacuum created by them (making Speed-Density tricky) and cost saving avoiding need to fit a MAF (Mass Air Flow sensor).
3.In conjunction with Individual Throttle Bodies and MAP as a load multiplier. (PowerFC D-Jetro for GTR Skyline) Alpha-N output is multiplied by a MAP sensor to come up with a composite load index.
4.In conjunction with MAF and some kind of blending algorithm. Used with silly cams that pull little vacuum at idle. Basically, TPS and MAP contribute bits to the overall load calculation.

Alpha-N is very poor at dealing with hills (think about engine load going up and down hills at a constant throttle position), temperature variations and just about anything else that you’d care about except closed to wide open throttle where it does fine.

"The dealer hooked it up and communicated with Hans und Fritz, and all is revealed. Despite the GS-911 returning suspiciously constant fuel pressure readings of about 2700, or 42 psi (which constant pressure was suspicious to me) the actual pressure was MUCH higher, causing overfueling. Apparently the fuel pressure sensor on the fuel rail was kaput."

 

[Moonmanzn]

I will have a look at the in depth now.

attached is my setup vs a standard 2006 r1200gs, my data i son top vs his at the same rpm.

Differences seem to be voltage on kock sensor, mine being 80 vs his 20v and his O2 sensor peaks at over 800mv and mine at 1100mv.

 

[Mistacat]

1100mv seems very high / rich.
If you can email me a copy of the .CSV files I would like to take a look at them, I will PM you my email address if that is ok.

 

[Moonmanzn]

1100mv seems very high / rich.
If you can email me a copy of the .CSV files I would like to take a look at them, I will PM you my email address if that is ok.

Would be appreciated

 

[GeorgeM]

Would be appreciated

You are comparing to different engine types.


Sent from my iPad using Tapatalk

 

[Moonmanzn]

Morning George

He has a 1200 and i have the later twin cam, i know they slightly different but comparing knock sensor voltages/lambda etc will still be possible

 

[Mistacat]

The log files I am comparing them with are Twin Cam , I have a lot of logs on record for both .

 

[botus]

on those charts he has his lambda sensors are cutting in and out.... ( which seems normal at those revs), yours are on all the time, is that a factor of the Dim Sport rapid bike always talking to the lambda sensor to make sure the numbers they want to report get bastardised by the evo first?


or a consequence of his throttle position is varying, making it go in and out of closed loop?

 

[Moonmanzn]

on those charts he has his lambda sensors are cutting in and out.... ( which seems normal at those revs), yours are on all the time, is that a factor of the Dim Sport rapid bike always talking to the lambda sensor to make sure the numbers they want to report get bastardised by the evo first?


or a consequence of his throttle position is varying, making it go in and out of closed loop?

I dont know, i noticed that too.

But even at 4500 rpm my lamdas are at 1100mv which seems excessively rich?

 

[botus]

my hex head runs rough as hell at this point (some engine balance / harmonic vibration issue), if you over fuel between 4200 and 4700 its smooths out a lot and gets past it faster

someone else agreed its a nasty rough spot too, so maybe your Dim sport is trying to help?

 

[Moonmanzn]

I dont know, it might be

I just won some o2 sensors on ebay for a tenner so will fit them when they arrive and see if that does anything.

 

[Moonmanzn]

Just stripped tank off, checked all hoses and connection.

Checked air filter and snorkel that its seated well and no obstructions.

All seems good.

Off to steptoe for oil change, valves and TB sync and brake fluid flush.

See what he thinks.

 

[commandoallan]

Hey,

Read through your post and have tried the same as yourself along with TPS change, Lambdas, new coils including lower coils etc, etc. Not using my bike to commute any longer and have had it sorned until a week ago so will start to look at this issue again.

I identified an issue with my RHS cylinder running at nearly 1.5 - 1.75 times the temp of my left (Infrared thermometer) which may indicate lack of fuel or possibly a dodgy read on the infrared thermometer. With the replacement of injectors and possible fuel lines left I will change the injectors with two new Bosch items just purchased from Europe and see how I get on.

Will let you know in a couple of weeks.

 

[Moonmanzn]

Ah thanks Allan

That's where we differ I think as my cylinder temps seem to be exactly the same.

I have dropped my bike off at Steptoes house for a service and a check over and hopefully he spots something diff.

Please do let me know if you solve it with injector swap.

 

[Moonmanzn]

Update

Steptoe couldnt find anything wrong bar TB where slightly out.

Await my 02 sensors and see what they do.

 

[Santa-2512]

Update

Steptoe couldnt find anything wrong bar TB where slightly out.

Await my 02 sensors and see what they do.

Have they been re balanced now?

did it make any difference?

 

[Moonmanzn]

Have they been re balanced now?

did it make any difference?

Yes he gt them sorted, it was smoother at low rpm but made no diff at my problem rpm of 5500 to 6k.

 

[Moonmanzn]

!!!!update!!!!

2 X o2 SENSORS/LAMDAS made no difference to my issues.

Bike stood for a year and a bit in dry garage, would gummed injectors give this issue? I have run bmw injector cleaner and redex a few times?

Have a F800GS in the garage so will rob thats injectors and try them out and see if possibly I have a gummed injector and restricting flow at high rpm?