| Author | Message | ||
     Birdmanrh |
This might help others, so i thought I might share. Since the whole deal of taking my bike to the dealer and trying to figure out why it was overheating I have been using Either the HD additive or Techron from Chevron (the additive and the fuel.) I have been doing this for about a month now and had no issues, but I was curious about the fan, since it seems to be a level of irritation for many. I took a ride into Tortilla Flat this morning 90degrees when I started and 102 on the ride out. For those who do not know it is a pretty technical road and you are pulling out of corners quite a bit, it is a good place to put and engine through a test! Bottom line the fan comes on when I stop! That's it. | ||
| Davo |
That is pretty amazing. My fan runs all the time after the first ten minutes or so. Did your fan run more before you brought it in for service? If so, I wonder if they re-flashed your ECM or has your fueling solution cooled off the engine that much. It is my opinion that there would have to be something more significant than additives to make the fan operation change that drastically. | ||
| Birdmanrh |
To be honest I don't know what the fan's behavior was before while riding since I ride with in-ear monitors with music. I do know that the fan ran more after shutdown following the 5K (It also got hotter) and that the fan runs less (after shutdown, same ambient temp) now after I started using additives and being very conscious of my fuel purchases. I am pretty sure no re-flash was involved with my ECM, but have no definitive proof. The tech only did exactly what the factory told them....including never getting the reading off of the TS until told. (I had to call Buell and practically demand it.) That and the gave me a step by step account of what the tested...I know the timing was not touched, either that or they figured out a way to do it without taking off the plate.  I don't have anything other than what is happening. | ||
| Davo |
Thanks, They could have checked the timing without pulling the plate. I used HD fuel conditioner when my pinging started this Spring when warm weather arrived. I thought I got some bad gas so I tried several different gas stations and I always used 93 octane. My pinging never stopped until I de-tuned the engine significantly. My fan operation has not changed that much other then it takes longer for it to come on. Once it starts running it never stops. I rode the bike 491 miles, mostly at 60 mph, on the Sunday of Memorial day week end and the fan ran for about 470 miles! I have some plans to make a temperature gage that can be used on the Uly. (Message edited by davo on August 20, 2006) | ||
| Birdmanrh |
Checked yes, but could they change it? | ||
| Davo |
They could not change the initial timing without pulling the plate. It is possible to change the entire timing curve by remapping the ECM but it is highly unlikely that they would have done that unless there was a factory technical bulletin indicating that the original map has been modified with EPA compliance. I think that the timing curve needs to be changed due to the summer fuel that is available to most of their customers. It is like selling someone a rifle that no longer shoots factory ammo. Some folks could reload the round themselves but most people would be lost. | ||
| Teeps |
With regard to the "fan operation", I read on BadWeb (somewhere.) That fan operation could be interrupted by cycling the engine stop switch (kill switch to old schooler's) from run to off( for 2 seconds) then back on. Well that does work when conditions permit. I have observed the following when cycling the switch: When driving >65mph on the highway. Cycling the switch does nothing, as the fan continues to run after the cycle. Cycling the switch when riding down hill, will turn the fan off. So far this works every time I've tried regardless of ambient temperatures. The fan will remain off until a heavier engine load is introduced. On steady state cruise, it's hit and miss whether cycling the engine stop switch will stop the fan from running. This makes me wonder if the Fan-Off temp (I think around 359F.) is lower than it really needs to be. In other words, turn the fan on at 428F., turn it off at 390/400 or some other arbitrary temperature (maybe something that Direct Link could do?) I offer my thoughts, based on my observations and (limited) understanding on how this fan works, and nothing more... | ||
| Davo |
Teeps, Thanks for the info on the kill switch. The fan on key on is 428 F The fan off key on is 356 F The fan on key off is 338 F The fan off key off is 302 F | ||
| Birdmanrh |
It there a temp for the two different speeds? | ||
| Davo |
Not that I am aware of. It appears that the voltage drops to the fan (fan slows) shortly after the key is turned off and the ET is above 338 F. I suspect that the requirements of the fan are less because the engine is no longer generating heat. |
