Thursday, January 19, 2012

HD sportster 1200 low?

2007 1200 cc sportster, screaming eagle air intake with vance/hines competition exhaust.

Why my sportster generates loud sound when idle; i seen other harley davidson with larger engine sizes, they have low noise when they are in idle mode and have deep/loud sound when it gets revving? Any recommendation? or sportster are designed that way? Have not problem with acceleration or ride with high speed. thanks.HD sportster 1200 low?
The only thing it could be is the VH exhaust.HD sportster 1200 low?
You failed to mention WHICH Vance and Hines exhaust system you have....they don't make a "competition" exhaust....short shots, longs shots, big radius, etc....which one do you have????



Almost none of the V%26amp;H exhaust systems available for a Sporty have packable, quiet baffles, they all use straight through open core louvered baffles that do almost nothing to control sound, they are only there to add SOME restrictive back presure, they are all basicaly drag pipes, they all suck for performance. Unless you change exhaust systems to one that has a different baffle design, the sound you hear is normal and not really changeable. As far as other bikes you hear, they have different exhaust systems with different baffle designs. Harleys stock headers with Screamin Eagle slip on mufflers are, believe it or not, actually one of the best performing systems on the maket, their exhaust cross-over tube/mounting bracket makes the system performas a 2-into-1 system.

Another VERY good exhaust system is the Drag Specialities Python 2-into-1 system for Sportys, it performs very well and has a quiter baffle design.



Did you have the fuel injection remapped for the added increase in air flow from the SE air cleaner and exhaust...if not...you NEED TO!!!!! this is a MUST!!!!.......the bike will have more power and run cooler.....



Harley'sStage 1 Download is SPECIFICALLY designed by Harley for THEIR air cleaner and SLIP ON mufflers only. ANY deviation from this, and the download is less than optimal. There is a very high probability you will get alot of exhaust popping and backfiring on engine decel. If you want it tuned RIGHT, get the Screamin Eagle Super Tuner and have the bike dyno tuned. The diference between the Stage 1 and a TUNED Spuer Tuner is like night and day, you will have better performance and fuel economy combined. It is pricey to have this done though, but I have always believed that you get what you pay for. The Super Tuner runs about $450 and tuning is usually around $250-350. With the Stage 1, if you pay the $200 and aren't happy, you're screwed, you lost the $200, and will have to have the Tuner added and then tuned, also the Stage 1 will not allow for any changes made in the future, with the Tuner, if you make changes again in the future, just have it re-tuned.



Stay away from the Power Commanders and Fuel Paks, etc, for Harleys, they are pretty much junk. The Super Tuner (SEST), I hate to say, is almost twice as expensive at $460 plus the cost of tuning, BUT, it is 100% fully tuneable for everything control of the ECM and does not require a big box and bulky wire harness to be mounted to the bike, it is simply an interface that reprograms the stock ECM, once remapped, it is removed and stored in a safe place (SEST's, once installed on a bike, are "married" to that bike and will not work on any other bike, so do not look at buying a used one, it won't work. The Power Commanders and Fuel Pak ONLY control fuel and maybe rev-limit, the SEST will adjust fuel, timing advance and curve, rev limit, engine decel enleanment to eliminate backfiring and popping, allow for engine size changes,, injector changes, and so on. The difference between a bike tuned with a Pwr Comm and an SEST is like night and day, generally you can expect about 5-10 more hp/tq from an SEST than a Pwr Comm

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