TPS question/Stumble problem?! - Event Date: January/01/1900 - January/01/1900

Hey Brock,  I got the whole street smart system installed.  Also added the ram air seals.  My bike is an 04 LE with 979 miles on it now.

I rode the bike after the install and it felt great.  One thing I noticed though is that when I took off from a stop and got the bike movin to about 3000rpms and then rolled the throttle aggressively (not snapping it) it seemed like it misses real quick at like 4000-4500rpms and then continues on as fast as it happens its gone.  But it happens enough to where I definately feel it and hear it.

I have my idle set at about 1250 by the tach, i didnt set it using a digital meter.  On the tach its between 1000 and the 1500 hash mark.

With all the talk in reference to the TPS and setting it at what idle rpm's  could this have any relation to my problem?  Does it matter what my idle is when and if i was to set it?  And could it be effected because I prefer a raised idle setting?

Or is this just a characteristic of your system or the PC map and its power curve which is designed more for high output gains?

 

As we discussed it was OFF........

 

I adjusted it.   OVER.....and OVER......and OVER........and finally it came in right.

Just opening the throttle and letting it snap shut will give you different readings than opening and closing softly if its off.  Its a pain but its worth it!!!!!

I also found that my adjust was the most stable when i could pull the fast idle lever and it would still be sitting at -COO like at the normal closed throttle position.  This way it seems that you are getting the most use of the complete variance of the resistor that monitiors the position before it raises the bar.  This seemed to help with the contraction and expansion effect of the engine heat in altering the adjustment while the bie is running at normal temps.

The stumble is gone and so is the feeling in my cheeks from smiling and freezing in that position.  Its 17 degrees here in MD today (plus a 130mph wind chill LOL), but i had to check it out so i could throw the blanket over it knowing its ready and let it sleep till opening day at Capitol Raceway or MIR  who ever goes first.....LOL

Thanks Brock

Hey Brock,  after reading this post, I had to check mine... sure enough it was off... after ajusting it a few time's I got it on... WOW! what a big difference it made!

                            THANK's Brock

Quote: Originally posted by BusaReds on January 28 05

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I also found that my adjust was the most stable when i could pull the fast idle lever and it would still be sitting at -COO like at the normal closed throttle position. 

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should you be able to pull the fast idle lever and still have it at -C00?

isnt that like twisting the throttle ?

so does this apply to the 1000's?

EDSBUSA,

Below is a copy of BROCK's post on this issue. If you are in the Maryalnd area and need more help let me know. I'm at Capitol Raceway in Crofton, MD. every Saturday. I have all the tools needed to check and set your TPS. I also use my laptop and the power commander software to verify results and settings. I'm no expert but Brock and folks here have taught me alot.

 

There is a white connector with a black plastic cover located behind your right rear side cover. You can sometimes get to it from the trunk…other times it is wire tied to the frame which requires the removal of the side cover for access. 

Jump across the connector with paper clip. The manual shows a mode select switch, the paper clip does the same job!  

Once you turn on the key –COO should show on your instrument display. The dash should be in the middle position. Twist the throttle to watch it move. After you twist the gas, it should return to the middle position…if it doesn’t you must adjust the TPS sensor located on the side of the throttle bodies. This requires a safety Torx bit. 

It the TPS is set too low…larger throttle openings won’t receive enough fuel. This usually creates a lean stumble. If it is too high, too much fuel is supplied at smaller openings creating a surge affect which hampers drivability and hurts fuel economy. 

Try this first and let me know what you discover. 

All Brock’s Performance maps are created with the TPS set at zero AND the stock ECU set at zero with a Yoshimura clicker box…this will be area number two to address if required. We have seen brand new bikes with the stock ECU adjusted to something besides zero? Of course this will add or subtract fuel from our map…..the good news it that 9 times out of 10 drivability issues are associated with an incorrectly adjusted TPS. 

So far not fixed. Zero'd it in, i give it full gas let off, it goes up and then back to the middle. But its still stumbling. Like around 1800-2200 it stumbles, then again somewhere between 4 & 5K.  Its starting to piss me off.

I had the same problem with my 02 busa. It stumbled around 3500-4000rpm. I adjusted the tps, still no good. Tried different maps. Better, but still not  very smooth cruising around town. Sometimes very hard to start also? After 3 months of dealing with this frustration I had my ecu zeroed out with a Yosh. clicker box and reloaded the 027b map. WOW, Its PERFECT. Feels like a new machine. Very responsive, and no stumble. Starts great also. Hope this helps.

if i got the (bar) to go back to the middle and i am still getting a c29 error code.  does that mean the tps is bad?  i ran the bike for about two weeks and it was fine.  yesterday at test and tune  it  would not start twice and it sputtered real bad, plus the whine you get when the fuel pump primes itself wasn't as long as it usually is.  i thought  it was something else so i ran the bike.  i tried to run the bike to see if it would clear up and it did as long as it was over 4000rpm's.  it actually ran faster than usual.  anything under 4000 and it was like trying to ride a bull.  can someone please help.

hey brock when i put in the paperclip jump over my bike begins to iddle higher than normal  , is that ok ?? i hope so pls let me know

thx

This clicker box... Where is it available from? Or better yet, what is it?

I have to say I am less than happy with how the bike runs except around more than half throttle.

HEY JUST CHECKED MY 07 AND IT WAS OFF TOO!!! TOOK ABOUT 5 MINUTES TO SET..AIN`T RODE IT YET BECAUSE IT`S RAINING HERE SO MAYBE TOMORROW ???

Did you adjust the TPS in the power commander software also after you set it correctly in dealer mode?

Also, dirty injectors will cause hesitation even with both of the above set correctly. The owners' groups covers this in more detail.

BD

is the adjustment the same for a 2008 busa? there is a white connector that has 4 wires going into it and a black connector that has 4 wires going into it.

The black one has a black cover on it while the white one has a white cap on it... not sure which one is suppose to be jumper'd...

Quote: Originally posted by Brock on December 29 07

Yes,

You just need to jump the correct two wires....not sure which ones as I am answering from home.

Call my office on Monday and ask for Jason...but, you really can't mess it up.

If you have the correct wires- the bar should show up on the cluster. open and close the throttle to watch it go up and down. It should stop in the middle position. If it doesn't, adjust the tps.

WARNING the 08 has 2 tps adjustments! DO NOT adjust the one which controls the secondary throttle plates!

If in doubt, purchase a service manual.

Brock

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For a frame of reference here is what I am looking at:

Maybe I am looking in the wrong place, but I don't see a white connector on the other side... 

got mine adjusted today finally. In the dealer mode it was already perfect no change there... But in the pc3usb it was showing @ 2% so I had to adjust that. Now it reads a perfect 0% with no throttle and a perfect 100% for full throttle.

Here is a last pic showing what I had to jump for the 2008 busa (to get in COO mode):

Quote: Originally posted by Brock on November 22 07

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Did you adjust the TPS in the power commander sofware also after you set it correctly in dealer mode?

Also, dirty injectors will cause hesitation even with both of the above set correctly. The owners groups covers this in more detail.

BD

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Set both TPS, I'm confused here? Does this apply to 08 or earlier models using an USB PCIII ?

Fug! Good LQQkn out.

 

Quote: Originally posted by Brock on December 29 07

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Yes,

You just need to jump the correct two wires....not sure which ones as I am answering from home.

Call my office on Monday and ask for Jason...but, you really can't mess it up.

If you have the correct wires- the bar should show up on the cluster. open and close the throttle to watch it go up and down. It should stop in the middle position. If it doesn't, adjust the tps.

WARNING the 08 has 2 tps adjustments! DO NOT adjust the one which controls the secondary throttle plates!

If in doubt, purchase a service manual.

Brock

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Brock, which two wires do I need to jump on the USB PCIII?

 

Thank you