| Author | Message | ||
     Ratsmc |
S21125r, here in Arizona it is already getting to about 85 degrees. With the IAT in the stock position, a reading of 114 even at highways speeds would not be out of the question. Of course, in another 2 months 114 might actually be the ambient temp here. | ||
| S21125r |
Ratsmc - did your ambient temp display change (on the ic) after the reroute? I thought I read someplace that the display was measured using a different means. Good point about the AZ heat! Sounds like a serious case of swap a$$... | ||
| Ratsmc |
Yes, the temp displayed prior to the relocation always read at least 15 degrees higher (and typically more than that). It now reads just about the actual air temp, sometimes just a few degrees higher. | ||
| Captain_america |
Same here. | ||
| Dannybuell |
someone asked "My question is this: why would the elves put the put the ambient temperature sensor at the front of the intake knowing full well that the radiator fans dump hot air right on it without calibrating the ECM to deal with the discrepancy? " I now think they have gone to great lengths to lean out the engine in every way possible and this appears to be one of those ways. '' Looking at the table above it appears that the best gas mixture is when it is cold and the worst when it is hot. If cold is good put the sensor onto a liquid cooled heat sink with a big fan on it. | ||
| S21125r |
Danny I don't think that to be the case. They could have applied a leaner correction for a lower temp in they table if they needed it be leaner. Or just put a leaner value in the fuel table to begin with. Although the above table may appear to be leaning it out, it's only doing so because the hotter air is less dense. It's attempting to correct it back to stoichiometric. Same type of correction takes place when comparing sea level to 12000 ft altitude. | ||
| Zac4mac |
I'm intrigued by all this, some very good work too. My AT is always within a degree or two once I'm moving at 45+ mph. If you stop, it takes a mile or so at 20+ mph to update. I know the exact spot it updates on my way to work. As long as you keep the inner airbox on, it is an accurate measure of IAT. Without the inner your new location looks very well placed. Z | ||
| Cataract2 |
Very interested in this one. Might do it soon. | ||
| Ratsmc |
Zac4mac, Inner airbox in or out made no difference with the temp reading. From what I have heard and seen, your situation is an anomaly. | ||
| Cataract2 |
Something I just thought about. We know how the EBR Race ECMs will read low on some bikes. Yet the tunes and Power Commander seem to show gains. Could this be because the EBR Race ECM still gets and uses input from the IAT while the tunes and PC reject input from it and don't adjust to what it says? | ||
| Joebuell |
do any of the race teams relocate the IAT sensor? This mod makes perfect sense but I just cannot wrap my head around why the sensor is where it is in the first place. | ||
| Zac4mac |
The sensor is in a high velocity section of the intake snorkel. It is a high flow location tho, only if the intake tract is airtight as designed. I think the reason mine works well and others don't, it's cool and loosely populated here. I have little to no stop-n-go and the lower ambients help. So far the lowest AT I've seen riding was 7 dF. I could easily believe that those in a warmer climate and/or those without the inner could benefit from the sensor re-locate. If mine ceases to be close, I'll consider it myself.... Thanks for the work guys. Z (Message edited by zac4mac on April 20, 2010) | ||
| Mountainstorm |
I relocated the IAT sensor in teh gutted airbox of my X-1 many moons ago on the notion that it should be as close to the intake as possible without restricting air flow. Unless there is some adjustment in the ECU I can't see any reason locating the 1125 IAT sensor in the same air stream as the intakes are swilling would be a bad thing. I might have to give this a try. | ||
| Jules |
I seem to recall this being a common mod on the TL1000R too, I did it to mine many moons ago. I'll probably do the same again with the R once the 620 mile service has been done (don't want to confuse the HD guys any more than I already will) | ||
| Avalaugh |
Have just been out to the garage and done this, it really is a great write up and a very easy mod. Just get a vacuum cleaner ready before you remove old filter as there will be stones/dust etc in the air box and you dont want that flicking into the throttle bodies. I would suggest removing the complete air box before drilling as it's easier to clean out all the swarf. I also took this opportunity to fit my K&N filter thats been sitting in my garage. | ||
| Aeholton |
do any of the race teams relocate the IAT sensor? This mod makes perfect sense but I just cannot wrap my head around why the sensor is where it is in the first place. Race teams aren't stuck in stop and go traffic where this would be an issue. Moving at race pace should keep temps at the IAT close to correct. It is in the low 80's here today. I saw AT readings as high as 98*F when sitting at traffic lights. Even after the light changed and I had been cruising for more than a mile, it was still reading 88*F. I think I will be performing this mod soon. | ||
| Avalaugh |
Is'nt the AT(ambient temp) sensor under the seat ? this mod wouldn't effect that, just the ECU reading of IAT(intake air temp). | ||
| Aeholton |
I thought the sensor under the seat is barometric pressure. | ||
| Captain_america |
Nope... Its the BPCVSM.. | ||
| Avalaugh |
"Nope... Its the BPCVSM.." So what is the BPCVSM then  | ||
| Thurstonbuell |
BiPolarChingasValveSphincterMechanism | ||
| Jules |
I thought the BPCVSM was a barometric pressure sensor? Oh God please don't start the "flux capacitor" jokes again... and the first person (besides me) to mention "blinker fluid" buys a round!  | ||
| Captain_america |
lol. Sorry. I finally crashed last night and don't feel so good, but that made me smile.  | ||
| Mountainstorm |
Hope you are okay. You inspired me to relocate the IAT. Here's the thread http://www.badweatherbikers.com/buell/messages/290 431/557540.html?1271810949 Thanks man. | ||
| Captain_america |
No Prob, I'm glad to see interest and guys doing it as well. I'm fine. Fractured collar bone Cracked 3rd rib right ring finger... last joint ground down with tendon. Haha haven't seen my baby yet... | ||
| Freezerburn840 |
Damn Captain! Hopefully you will be okay and heal up soon. I will miss my riding buddy through So Cal traffic. | ||
| Freezerburn840 |
need to get this mod done. i think the ecu does lean out a bit when the temp reading is astronomical. | ||
| Captain_america |
Astronomical describes it perfectly! ya man it has been fun blasting through traffic with you. I can post a pic of my finger ... It's pretty gory though... | ||
| Ridenusa4l |
so what exactly happened to make you crash?? curb jumpin LOL Jake | ||
| Captain_america |
Quite dumb actually. I was standing up adjusting my pants after getting off the freeway, doing about 50, over some railroad tracks, which are very smooth, and the front end swapped and I tried to get my left hand back on the bar but failed. Whiskey throttled with the right hand into a small wheelie and I guess leaned or was falling off the bike on the right side. Landed with my right hand still gripping the bar apperantly and ground my finger into the pavement and impacted with all my weight on my right shoulder. Tumbled for a but and hopped right up to see the bike sliding to a stop. Ran over to right her up and felt the warm blood dripping out of my leather glove and realized my shoulder wasn't right either. Then the waaaaaammbulance came and picked me up. (Message edited by captain_America on April 21, 2010) |
