Join Date: Sep 2011
Location: Southern Maryland
The best you are going to do with the stock airbox is drill holes (ahead of the filter!) in the opposite side from the access panel and drill some holes in the front of the airbox.
The issue with the stock airbox is two-fold. 1) The panel filter is too small (not enough surface area) and 2) The tubes in the airbox are too small in diameter. It's simply too restrictive to produce more than a certain level of performance. Even if you perforate the crap out of it, it can only provide so much airflow. It is designed to be as much of an intake silencer as it is a source of air.
Airboxes like the S&S and the Lloydz (very similar) airbox are a trade off... losing a bit of low end torque in exchange for more overall airflow. These airboxes are worth about a dozen more HP than the stock airbox can give you. Rolling the throttle on rather than smacking it open, keeping the air velocity as high as possible, will give the best acceleration and minimize the loss of intake velocity at low RPM (manually acting like a CV carb or an old vacuum secondary 4-BBL carburetor).
The Torque Tubes give both increased airflow AND increased air velocity, which will give the engine more oomph from idle to the rev limiter. Peak HP increases may only be 2 HP... but overall area under the curves will increase substantially. The road "sees" your engines power over time and distance. Even a gain of 4 ft-lbs of torque from idle to rev limiter will make a major change in the bike's acceleration over time and distance.
As an example: My friends bike and mine are only 3 tenth of a second apart in a 1/4 mile drag race (8 HP)... But my torque is stronger across the tach and especially below 3500 rpm... so out on the road the acceleration difference is much more noticable. My bike accelerates with more authority from any rpm/road speed than the difference in our peak HP would indicate.
While the S&S airbox is very good, the Torque Tube airbox is better overall. There are still trade-offs with how the sensors are placed and how the crankcase vent system works (and you can smell the crankcase fumes when you're stopped and the oil mist makes a mess)... so the TTI is more toward a race piece than an airbox like the S&S where the sensors and crankcase vent work pretty much as they do in the stock airbox.
Boy, that was long-winded, huh?
2006 Victory Kingpin
Lloydz 116" Stroker/Big Bore, .495 Cams, Torque Tubes Airbox,
RPW Thor Pipe, Lloydz ECU Flash, PC-III, PTS (-2), Rivera
Primo Clutch Spring, 31 Tooth Pulley w/Buell Belt.
Last edited by half_crazy; 07-13-2012 at 09:41 AM.