The ECU is now programmed to see that when the throttle is fully closed, the TPS Voltage is 1.46V, Therefore it needs to spray 200CC's of fuel in. Because it's a simple computer, it cannot detect a negative percentage, so when you close the ACTUAL THROTTLE, the ECU is still putting out it's current minimum amount of fuel set for TPS 25%, because according to the ECU's calibrated programming, TPS 25% = ECU 0% Thus when you close the throttle completely, and the ECU is still putting out TPS 25% of fuel, but the Throttle is a 0%, you run into an extremely rich condition, thus making the engine run rough and inefficient.
Again, someone correct me if I'm wrong in my thinking... I'm not an engineer.
Haha...don't worry, I'm only laughing here because we're having a fun and interesting discussion. This is quality stuff.
Ok, so...just to clarify...the FI ECU fuel map(s) are in percentages....not volts. Forget about the TPS volts for a second...the volts do not determine how much fuel is injected.
The FI ECU converts the TPS volts into percentages so that it knows exactly how far the throttle plates are open.
If you were able to calibrate the ECU so that 1.46v was 0%, then the ECU would inject the amount of fuel at 0% in the fuel map....which is @ idle.
I hope that helps.
Rem
Ok, so...just to clarify...the FI ECU fuel map(s) are in percentages....not volts. Forget about the TPS volts for a second...the volts do not determine how much fuel is injected.
The FI ECU converts the TPS volts into percentages so that it knows exactly how far the throttle plates are open.
If you were able to calibrate the ECU so that 1.46v was 0%, then the ECU would inject the amount of fuel at 0% in the fuel map....which is @ idle.
I hope that helps.
Rem
Yes, it helps me a bunch, I think. I thought that was what I was trying to say earlier.
However we still don't have any hard data (from the KDS or anywhere else) as to if the "TPS Calibration procedure" is changing anything or just what it is changing right? All we have hard data on is the sensor voltage.
Yes, it helps me a bunch, I think. I thought that was what I was trying to say earlier.
However we still don't have any hard data (from the KDS or anywhere else) as to if the "TPS Calibration procedure" is changing anything or just what it is changing right? All we have hard data on is the sensor voltage.
Well, the lack of hard data is almost data in itself isn't it?
If there was a calibration procedure, it should definitely be in the service manual following an ECU change, and it isn't there. I actually have two ECU's...one is a spare from another 2010 model C14 that I bought when I was first flashing my ECU(s). I've swapped them in and out of my C14 many times, and I've never calibrated anything. If the FI ECU needs to be calibrated to the TPS in order for it to work properly, then there's no way that I should be able to install a used FI ECU out of a wrecked bike in my 2010 C14 and have it run showroom smooth.
I'm not trying to give the original poster a hard time or anything...lol, I'm just throwing some realism into the mix of optimism and skepticism...lol.
That's all just my opinion of course...maybe my C14 isn't running well and I think it is? Anything is possible...we all 'feel' things differently on these bikes that are mostly all the same.
Maybe we'll all learn something new here.
Rem
Well, the lack of hard data is almost data in itself isn't it?
<snip>
Maybe we'll all learn something new here.
I think the only way to get hard data would be to do a dyno run with it. That would give us a REAL look at all of the data...
I wonder if my shop will donate some dyno time for science... (Yeah right... lol)
Actually, a dyno is not really what is wanted here- an O2 sensor log from a "miss- calibrated" C-14, coupled with the same bike "correctly calibrated" would be ideal. Now if we could only find someone with an O2 sensor on a C-14 that can collect that data and likes to tinker..... Let me think, who could that be.....
Brian
Well, the lack of hard data is almost data in itself isn't it?
Hahahahahaha.....it actually took me a second to catch on here...duh...lol.
We'll see...lol. I was just digging through all the closets tonight trying to locate all of my Firstgear long underwear and my heated vest, etc. It's starting to cool off here and everybody is all but putting their bikes away, and here I am planning my riding for the next two months like it's the start of spring already...lol.
I may do some more tuning (and tinkering) this fall if I have time.
Rem
What tyres are you using on those bikes? Do you have studs in them?
Brian, why the hesitation? NOT calling you out, but, if nothing happens, why not do it? Genuine question? Yes, genuine. There are those who think the moon landing was actually filmed in a studio set. Prove or disprove (at least to your satisfaction) by action and not theory. I wish I still had my C14 to do the procedure myself. I am super curious (and naturally want to think I stumbled on something unique, a first of sorts). For a friend if nothing else, just do it, please?
I ride all year round even in Colorado but not on roads with ice or snow. Studs must make a huge difference because without them, this is just nuts.On the return trip we intended to beat the sunset, didn't happen, we watched the temp gauge hover at 33, just as the sun was setting the flurries started in, still at 33. Sun goes down, no good spot to pull off safely (yes, I said safely). The third member of our party had headed west to meet up with his lady friend. Somehow we allowed him to leave with the cordless driver we used for the stud insertion and removal. Yes, we were as the saying goes, screwed, without the benefit of a reach around. Slowed down to a safe (er) speed, repeated the words ride relaxed, it's just like mud, (a million times). It started snowing for real, hands got cold from wiping the snow off of my visor (Hippo hands work great with plain old dry gloves and the grip warmers on). We stopped at an overpass (no snow, brakes worked there) to put on dry, insulated gloves. Continued on. The worst part? Getting passed by a truck doing 45ish, wind blast pushed me several feet sideways. Needless to say I was scared stiff and frozen with fear. No pun intended... Made it through the pass, temps got to 35, felt almost balmy as the sweat started thawing. Dennys never looked so good. Moral of the story? I don't have one, maybe Brian can come up with something witty after he gives the procedure a try?