Heat Question - again
if you do an air cleaner and pipes you need a tune..
If heat in stop and go traffic is a problem then you need a crotch cooler they work very well.. http://www.capt-itch.com/
Yep, what he said. For less than $700.00 from Fuel Moto you can get Jackpot slip-ons, stage 1 air cleaner and Power Commander. You'll get more power and a cooler motor with little to no loss in fuel economy.
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This is how it works, for simplicity sake, only how the exhaust, cylinder/piston, and intake work as a system.
The cylinder and piston act as a pump with finite pumping capabilities (volume), partially dependent on bore and stroke. When the factory tunes this pump, one of a miriad of parameters is the air quality out the exhaust, dictated by Government Standards. Today's motors are run extra lean from the factory to allow a cleaner exhaust quality, with less unburnt fuel being part of it. Another factor is noise restriction. These two factors (among others) determine the amount of air flow the exhaust will need to produce, and generally being rather restrictive to accomodate the noise limits. With only a certain amount of airflow allowed out the exhaust, the engine will only produce a maximimum equal to the amount of air the exhaust can accomodate out. This in turn, is true of the intake, notibly the amount of air required in.
Now this is not to say the engine can't produce more volume, just that it can only push out (exhaust) or pull in (intake) as much as the lesser of the two will allow, and is designed to all work together optimally as a system.
With that said, changing a part of that system may not make a difference. For instance, you could open up the intake side to allow enough air in to fill a stadium. Problem is if the exhaust is left alone it can still only push out what it was originally designed for. Likewise, opening only the exhaust will be limited by what the intake allows. Like I stated earlier, it is designed as a system and will more then likely be pretty close to optimum on both ends, so only one change will not (generally) impart much of a performance gain.
However, open both ends up and it will allow the engine to produce more volume. This in turn presents problems because now with more volume the Air/Fuel ratio is changed, creating an even leaner ratio then what was originally designed in. That's where the fuel metering upgrades come into play. Which can also be tailored to accomodate a richer Air/Fuel ratio allowing the fuel to partially cool the intake charge and thus reduce cylinder and head temeratures.
So, in my opinion, opening up your intake will probably be OK since the restricive exhaust will not allow the the engine to use it to it's potential. Not that the fuel system is adjusting to it.
But again why would you do it?
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I can tell you from experience that:
1) An different air filter alone will do absolutely nothing to reduce the heat.
2) In order to reduce the heat, you need to run richer, which means, add more fuel to the air/fuel mixture set-up in the stock ECM. The ECM doesn't adjust itself, adding more fuel in the mixture is done by either modifying the settings in the ECM itself (SERT) or by piggy-backing the ECM with a different device (PC-V).
3) Even with a richer mixture and with the addition of an oil cooler, my bike still runs very hot in stop and go traffic, to the point of shutting off the rear cylinder very frequently.
Again, some people withstand heat better than others. I might be oversensitive, I don't know, but I'm not a happy camper in summer and my passenger ain't happy either.
I love my Ultra, don't get me wrong but too hot ain't pleasant. Good luck.
Last edited by frenchbiker; Jun 25, 2010 at 02:19 PM.
Losing the cat, adjusting the AFR (air:fuel ratio) will do wonders for the heat. I also strongly suggest the HD mid frame heat deflectors.
Not to pricey all things considered. Your bike will run better and cooler.






