New theory on an old problem - Stock performance/slow acceleration
Tourer
Joined: Mar 2011
Posts: 313
Likes: 0
From: Sweden
Can someone please explain 'pinging' and 'WOT' for someone who don't have English as a first language. What do you mean when the motors "pings"?
"only time my bike has pinged over the last week has been when I've intentionally banged it to WOT at extremely low RPM to induce it"
Thanks!
"only time my bike has pinged over the last week has been when I've intentionally banged it to WOT at extremely low RPM to induce it"
Thanks!
Thread Starter
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Road Warrior
Joined: Nov 2006
Posts: 1,699
Likes: 2
From: Deltona, FL
Can someone please explain 'pinging' and 'WOT' for someone who don't have English as a first language. What do you mean when the motors "pings"?
"only time my bike has pinged over the last week has been when I've intentionally banged it to WOT at extremely low RPM to induce it"
Thanks!
"only time my bike has pinged over the last week has been when I've intentionally banged it to WOT at extremely low RPM to induce it"
Thanks!
Thread Starter
|
Road Warrior
Joined: Nov 2006
Posts: 1,699
Likes: 2
From: Deltona, FL
Go for it, it's only a few minutes of your time and an adjustment away from back to normal.
I think I'm going to add in that 1/2 to 1 turn additional tightening just to see if performance returns to the same way it was before. I just want to verify that the adjustment is what made the difference.
I think I'm going to add in that 1/2 to 1 turn additional tightening just to see if performance returns to the same way it was before. I just want to verify that the adjustment is what made the difference.
Ultimate HDF Member
Joined: May 2008
Posts: 6,642
Likes: 48
From: Ogden, UT
Must be a change after 05, my manual has nothing about 1/2-1 turn, nor does it differentiate between carb and EFI adjustments.
One thing this thread did do was cause me to read it though...
One thing this thread did do was cause me to read it though...
6th Gear
Joined: Nov 2009
Posts: 14
Likes: 0
From: Bossier City, Louisiana
Unless you replaced the hand grips and the curcumferance of the cable groove is bigger, then making the cable shorter or longer makes no difference in the ratio of turning the grip to the opening of the efi throttle.
The only differnce you you seem to have made is that you are now opening the throttle as soon as you turn the grip and it now goes through the full motion on the efi throttle. Of course the vacuum leak would make a difference too, adding more air and leaning out the mixture. This would cause a pinging sound under load, esp in 6th gear. It sounds like you had a lot of play in the old cable, especially with the adjusters messed up.
It sounds to me like you had enough slop in the cable to affect the opening, delayed, and then it not opening up all the way at WOT. On your old cables. Shortening or lengthening the cable has absolutely no effect on opening or closing rates. Now shortening a spring by cutting coils will make it stiffer, never softer. So I think you are just feeling what you should have felt with the bike if the cables were in good shape and adjusted right. At least now you will know how feels if the adjusters start going out again.
Russ
The only differnce you you seem to have made is that you are now opening the throttle as soon as you turn the grip and it now goes through the full motion on the efi throttle. Of course the vacuum leak would make a difference too, adding more air and leaning out the mixture. This would cause a pinging sound under load, esp in 6th gear. It sounds like you had a lot of play in the old cable, especially with the adjusters messed up.
It sounds to me like you had enough slop in the cable to affect the opening, delayed, and then it not opening up all the way at WOT. On your old cables. Shortening or lengthening the cable has absolutely no effect on opening or closing rates. Now shortening a spring by cutting coils will make it stiffer, never softer. So I think you are just feeling what you should have felt with the bike if the cables were in good shape and adjusted right. At least now you will know how feels if the adjusters start going out again.
Russ
Road Warrior
Joined: Aug 2009
Posts: 1,630
Likes: 17
From: Central FL
Your TPS moves with the throttle plate. Changing the adjustment on your cable will not move the TPS at a different rate than the throttle plate. If you are thinking as you stated that there are no mechanical changes in the FI system then you need to take the air cleaner off and look in there. When you operate the throttle the butterfly valve opens mechanically with the cable. The TPS just tells the inboard computer how far it's opened and that reading along with manifold pressure are used to calculate engine load and fuel requirement. It doesn't matter how you open the throttle, it can be a cable or by hand, the TPS will always move with the butterfly valve. In other words you theory is not true.
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Elite HDF Member
Joined: Aug 2006
Posts: 3,863
Likes: 21
From: Kennewick, WA
Unless you replaced the hand grips and the curcumferance of the cable groove is bigger, then making the cable shorter or longer makes no difference in the ratio of turning the grip to the opening of the efi throttle.
The only difference you you seem to have made is that you are now opening the throttle as soon as you turn the grip and it now goes through the full motion on the efi throttle. Of course the vacuum leak would make a difference too, adding more air and leaning out the mixture. This would cause a pinging sound under load, esp in 6th gear. It sounds like you had a lot of play in the old cable, especially with the adjusters messed up.
It sounds to me like you had enough slop in the cable to affect the opening, delayed, and then it not opening up all the way at WOT. On your old cables. Shortening or lengthening the cable has absolutely no effect on opening or closing rates. Now shortening a spring by cutting coils will make it stiffer, never softer. So I think you are just feeling what you should have felt with the bike if the cables were in good shape and adjusted right. At least now you will know how feels if the adjusters start going out again.
Russ
The only difference you you seem to have made is that you are now opening the throttle as soon as you turn the grip and it now goes through the full motion on the efi throttle. Of course the vacuum leak would make a difference too, adding more air and leaning out the mixture. This would cause a pinging sound under load, esp in 6th gear. It sounds like you had a lot of play in the old cable, especially with the adjusters messed up.
It sounds to me like you had enough slop in the cable to affect the opening, delayed, and then it not opening up all the way at WOT. On your old cables. Shortening or lengthening the cable has absolutely no effect on opening or closing rates. Now shortening a spring by cutting coils will make it stiffer, never softer. So I think you are just feeling what you should have felt with the bike if the cables were in good shape and adjusted right. At least now you will know how feels if the adjusters start going out again.
Russ
Big Kahuna HDF Member
Joined: Feb 2006
Posts: 23,881
Likes: 34
From: USA
Your TPS moves with the throttle plate. Changing the adjustment on your cable will not move the TPS at a different rate than the throttle plate. If you are thinking as you stated that there are no mechanical changes in the FI system then you need to take the air cleaner off and look in there. When you operate the throttle the butterfly valve opens mechanically with the cable. The TPS just tells the inboard computer how far it's opened and that reading along with manifold pressure are used to calculate engine load and fuel requirement. It doesn't matter how you open the throttle, it can be a cable or by hand, the TPS will always move with the butterfly valve. In other words you theory is not true.