Airbox Cover Oval and Powerfilter-Kits
The standard air filter can be replaced with relatively little effort itself against a Thunderbike product. If it’s just a matter of putting an accent on a design part, our TÜV-certified air filters and airbox covers are the first choice!
Our oval air filter can be combined with various Thunderbike covers and is suitable for all Twin Cam models with throttle by wire. The base plate is equipped with a filter element that makes the conversion from a round to an oval filter a breeze.
For the subsequent assembly of our design filters, only the existing holes and threads are used. The new bracket is attached with the existing engine bleed screws. The adapter ring, also supplied, is placed on the holder and the ventilation hoses are attached. Then comes the new base plate and everything is fixed with three screws on the throttle body. The Thunderbike air filters are prepared so that the air passage corresponds to that of the factory filter. Consequently, no further modifications to the EFI control need to be made. However, the reduction plate can be removed in a few steps and the air flow increased in this way many times. In conjunction with an adapted engine management system, the performance of the engine can be significantly increased.
The new design housing is screwed onto the base plate with the included K & N filter element. After a maximum of one hour, the screwdriver work is completed and we can, in our open version, devote ourselves to customizing the software. That sounds complicated, and it actually is. There are several ways to influence the controller. Either with an additional component, with the complete replacement of the so-called black box or with the direct reprogramming of the Harley-Davidson control unit. The latter variant has obvious advantages and is generally preferred by us as well. With the Super Tuner, you do not get an additional component that is mounted on the bike, but only an interface between the motorcycle and computer, which is to bring along with you at your next workshop appointment, if changes of the mapping should be necessary. The Screamin ‘Eagle Supertuner does a lot more than just update the mapping for our air filter. It can be used to influence all parameters of the control unit. For example, it is possible to regulate the idle speed as desired (at least 800 revolutions per minute). Above all, however, the possibility of increasing performance with this measure should be interesting.
Incidentally, a new mapping may also be required if only the exhaust is replaced. If you want to know how big the power increase at the rear wheel actually is in the end, it should still be determined with original air filter and without new mapping on the dynamometer. The bike was thus connected via Supertuner with the computer, on which in turn the appropriate software is installed, which holds various basic mappings ready. After changing our filter and switching the Super Tuner between the bike and the computer via USB port, you can test several of these predefined mappings. Every change is immediately displayed on the monitor. The situation on the test bench is largely realistic, but the load of the bike is not yet one hundred percent road use. Now follows a long test drive of the mechanic, including connected Super Tuner. On the housing of the tuner there is a pressure switch, from the moment where it was pressed, the device records all parameters, after which the mapping can be tuned exactly (Smart-tune). The result is impressive! Depending on the engine speed range, we were able to easily achieve an increase in horsepower of up to eight horsepower in this case. Using a printed performance diagram, the changes made are visible to the customer.