Balancing the Throttle Bodies

[Journeyman]

Update: I was ready to balance the TBs tonight, but when I checked their status it just leads to more questions that some of you may be able to answer.
First I checked for error codes and saw this. Doesn't look good. I cleared it and on the next start it wasn't there. We'll see if it comes back...

Now, a check of the throttle bodies. Here were the numbers. After the bike warmed they dropped down to about 530. Sometimes briefly in balance, but usually with one, either #1 or #3 being off by 10 points. I never saw them at any figure other than multiples of 10, so wondering if on TuneECU that is what you get.

Here is the recommended setting from the manual....

That's a pretty significant difference and I doubt they've shifted that much in 16,000 miles. I guess I should attempt to adjust them down, but also wondering if being equal (or nearly) as they are is reason not to meddle with them. On the 2.3 Rockets I believe just getting them equal was the goal- not specific values. Thoughts?

 

[TURBO200R4]

Just my opinion
But I would be happy with those numbers.

 

[Journeyman]

Just my opinion
But I would be happy with those numbers.

I was hoping to hear from you and also hoping that is what you would say. Thanks.

I'm puzzled by that code. The engine check light has not been on, so not sure what's up with that. Anyway, I'll ride tomorrow and see if it comes on and run TuneECU when I get home.

 

[TURBO200R4]

I usually just clear codes (like you did) and see if it comes back.
If it doesn't come back in a month then you are probably okl

 

[dougl]

Update: I was ready to balance the TBs tonight, but when I checked their status it just leads to more questions that some of you may be able to answer.
First I checked for error codes and saw this. Doesn't look good. I cleared it and on the next start it wasn't there. We'll see if it comes back...

Now, a check of the throttle bodies. Here were the numbers. After the bike warmed they dropped down to about 530. Sometimes briefly in balance, but usually with one, either #1 or #3 being off by 10 points. I never saw them at any figure other than multiples of 10, so wondering if on TuneECU that is what you get.

Here is the recommended setting from the manual....

That's a pretty significant difference and I doubt they've shifted that much in 16,000 miles. I guess I should attempt to adjust them down, but also wondering if being equal (or nearly) as they are is reason not to meddle with them. On the 2.3 Rockets I believe just getting them equal was the goal- not specific values. Thoughts?

The absolute values don’t matter. They will increase with increasing rpm. You should check them at idle and a higher rpm. From what I’ve gleaned, Tuneecu displays MAP to within 10 hPa - if the pressure is 433, it should display 430 - if the pressure is 437, it should display 440. If the numbers agree to within 10, the throttle bodies are balanced. However, Tuneecu is getting the numbers from the ECU, not the sensors themselves. I’d be surprised if the sensors can only read to 10 hPa - more like 1 hPa. If I remember, Dealertool also reads to 10 hPa. What about the dealer’s diagnostic tool? From the above and my T120 shop manual, it looks like the dealer’s diagnostic tool displays to 1 hPa. The tool indicates to the tech if the throttle bodies are balanced or not. I don’t know what the +/- tolerance is.

 

[Gregger]

The 3 recorded numbers you posted from TuneECU are different than the 3 given as examples in the manual because they are different measurements. Tune ECU measures in hPA (hectopascals) and the manual is giving you readings in mmHg (millimetres of mercury). Conversion is 1 Hectopascal [hPa] = 0.750 061 575 845 66 Millimeter of mercury [mmHg]

As to the error code, it is indicating a higher value than the 5 volt range typically used for sensors indicating an open circuit. Could be a glitch, in which I'd wait to see if it returns. If it does, I'd start looking for a loose connection. What was happening when that code popped up? Did the engine run any different???

 

[Journeyman]

The 3 recorded numbers you posted from TuneECU are different than the 3 given as examples in the manual because they are different measurements. Tune ECU measures in hPA (hectopascals) and the manual is giving you readings in mmHg (millimetres of mercury). Conversion is 1 Hectopascal [hPa] = 0.750 061 575 845 66 Millimeter of mercury [mmHg]

Good thing i didn't start fiddling with the adjustment. Thank you- I didn't pay attention to the difference in measuring scales. If I do the conversion using 530hPa I get 397.53 which is quite a bit off from ~480 on the Triumph chart. You figure I should be happy with a reading within 10 points on TuneECU and call it a day, or do the conversion and try to get them all up to (according to my calculation) to ~ 639.95?

As to the error code, it is indicating a higher value than the 5 volt range typically used for sensors indicating an open circuit. Could be a glitch, in which I'd wait to see if it returns. If it does, I'd start looking for a loose connection. What was happening when that code popped up? Did the engine run any different???

I just returned from a weekend trip and she was running fine. Blipping the throttle while observing the readings on the cylinders it did seem like it was a little rough- I may have been influenced by seeing the error code. I'm about to ride into work and I'll flog her a bit and see how she reacts. No engine warning on the display before or now. Hoping it is just a glitch.

 

[imcool]

@Journeyman28778 My friend's brand new rocket, I am not sure if this of any help

but @Gregger I am confused, why brand new bike has same values as Journeyman throttle body values?

 

[Gregger]

Good thing i didn't start fiddling with the adjustment. Thank you- I didn't pay attention to the difference in measuring scales. If I do the conversion using 530hPa I get 397.53 which is quite a bit off from ~480 on the Triumph chart. You figure I should be happy with a reading within 10 points on TuneECU and call it a day, or do the conversion and try to get them all up to (according to my calculation) to ~ 639.95?



I just returned from a weekend trip and she was running fine. Blipping the throttle while observing the readings on the cylinders it did seem like it was a little rough- I may have been influenced by seeing the error code. I'm about to ride into work and I'll flog her a bit and see how she reacts. No engine warning on the display before or now. Hoping it is just a glitch.

I'd be happy with those readings. The conversion factor I gave you was from the net. I wonder if a vacuum leak would lower or raise the readings??? Can't remember.

 

[imcool]

I'd be happy with those readings. The conversion factor I gave you was from the net. I wonder if a vacuum leak would lower or raise the readings??? Can't remember.

Any idea on why brand new bike has same throttle body numbers as Journeyman bike