new harley performance tips

When triggered through the ECM, the fuel injectors spray fuel in to the intake tract. High-flow fuel injectors are for sale to modified engines and therefore are ranked in line with the pounds of fuel each hour ran. Although setting up high-flow injectors can boost the maximum energy possibility of an EFI system, it doesn't guarantee that energy increases. Usually, injectors aren't maxed-out until pressed beyond their 80-percent duty cycle. Furthermore, fuel pressure may have a major impact on injector operation. Setting up high-flow injectors when they're not needed may cause tuning problems, so consider beginning with stock injectors until it's determined that high-flow injectors are essential. Still, some tuners use high-flow injectors like a tuning aid, but frequently you will find less pricey ways to offer the same results.
EFI Tuning Helps
Several EFI tuning helps are for sale to the engine builder and tuner to assist eliminate popping, tripping, surging, pinging, flat spots and getting too hot, that are sometimes experienced with modified EFI engines. EFI tuning helps could be split into three major groups:
•Downloadable fuel maps (known as ECM calibration by Harley)
•Add-on modules
•Map-based reprogrammers (an add-on module might be utilized)
Downloadable Fuel Maps
Fuel maps are loaded in to the stock EFI ECM to optimize the environmentOrenergy mixture and ignition timing for any specific engine parts combination. Both Factory and aftermarket producers offer downloadable fuel maps. Harley calls their downloads "ECM calibration" and it has a number of different calibrations for a number of stages of Screamin' Bald eagle performance kits. Harley's ECM recalibrations are particularly created for engines outfitted with Harley provided EFI systems (Delphi or Magneti- Marelli). How a process works is you first buy the fuel map from the Harley dealer, and you outlay cash to downloaded it to your ECM. Several aftermarket EFI parts producers offer downloaded fuel maps at their store for given engine combinations. Generic downloadable fuel maps would be the cheapest cost way of getting rid of theguesswork of tuning an EFI engine with performance modifications.
Add-On Modules
Add-on modules connect in series between your stock ECM and fuel injectors and customize the ECM's output signals prior to the signals achieve the injectors. Most models are modified using a screwdriver to regulate the "containers," which adjust revoltions per minute transition points (not a chance to boost the rev limit) and air/fuel mixture. Other add-on modules require entering amounts utilizing a display/button device. Certain add-on modules are only able to instruct the injectors to include fuel or richen the environmentOr fuel mixture, while some include a chance to both add (richen) and take away (lean) fuel. Pot-based products are relatively inexpensive but have certain restrictions regarding the selection of performance engine modifications they are able to tune.
Map-Based Reprogrammers
When your engine makes its way into the 100-plus cubic inch range, or you earn major engine modifications, pot-like products cannot fulfill the engine's air/fuel needs. That's where map-based reprogrammers, like the Harley- Davidson SE Race Tuner, come up simply because they be capable of make virtually limitless fuel map changes towards the stock ECM.
Dynojet's Energy Commander is really a mapbased reprogrammer that connects in series between your ECM and fuel injectors. The add-on computer stores maps that may be reprogrammed having a pc (PC) for an array of engine combinations. Fuel, ignition, and revoltions per minute values could be transformed for front and back cylinders.
Harley-Davidson's Screamin' Bald eagle Race Tuner is really a software map-based reprogrammer that needs no add-on module since it is able to reprogram the stock ECM. The Race Tuner software enables hooking up your personal computer towards the stock ECM. When the Race Tuner uploads a brand new map in to the stock ECM, laptop computer and needed hardware key are removed with no additional parts stick to the bike. ECM fuel, ignition, start-up, warm-up, and rev limit values could be modified. The Race Tuner includes the purpose for setting injector size for greater tuning versatility. Several operating modes can be found, from fundamental to advanced and data monitoring. The Race Tuner and Energy Commander offer a similar experience for the reason that fuel map cells represent the proportion of change, either plus or minus.
Aftermarket EFI Systems
Several aftermarket companies offer complete alternative EFI systems for that stock fuel injection system. Scalping strategies include their very own ECM and software for manipulating the ECM. Furthermore, aftermarket EFI systems offer carbureted bike proprietors a chance to upgrade to fuel injection and will be offering proprietors of early stock Magneti- Marelli EFI systems upgrading path that could better accommodate major exhaust modifications.
Final Ideas
No matter regardless if you are modifying a carbureted or electronic fuel injected engine, the induction concepts stay the same, only how you start making modifications changes. Keep in mind that the objectives will be to increase air flow while adding fuel most likely through flying or fuel mapping changes to keep the best possible fuel ratio for optimum energy. For '06 Dynas and all sorts of '07 bikes, the Delphi EFI system works inside a closed-loop mode, needing O2 sensors within the exhaust. Make sure any new exhaust system includes bungs for that sensors. Some '06 or more Twin Cam EFI models run hot. The issue is associated with the EFI closed-loop operation. Re-calibrating the ECM and setting up an electric train engine oil cooler are temporary measures that will help minimize the issue, however seek advice from your dealer for just about any warranty implications.
For those who have a carbureted engine, you've still got the simplicity tuning the induction by hand by altering jets, needles and orifices. For EFI proprietors, regardless of the complexity of fuel injection, you will find yourself convenient dealing with them once you understand the fundamentals. But regardless of the kind of nduction system you've, carburetedor EFI, make sure to upgrade and tune it as being an entire system of interdependent parts and try to find out the true performance bottleneck prior to making aimless modifications. author: ). William Denish
EFI-based engines are most generally updated utilizing a dynamometer however, they may also be updated through trial-anderror testing in the pub and racetrack. To simplify tuning and lower testing time, Harley-Davidson Screamin' Bald eagle and aftermarket companies offer a number of pre-updated software calibration modules for a number of engine combinations. The calibration modules are software tables that contains new fuel flow and ignition timing parameters, that are loaded in to the ECM. Much like a carbureted engine needing flying changes to keep proper air/fuel mixture when modifications are created, an EFI engine requires ECM changes to change fuel flow and ignition timing for any modified parts combination.

To acquire maximum performance for free-flowing exhaust systems, performance cams, high-flow heads, and bigbore kits, more air and fuel is needed. Just like carbureted engines, the tock EFI air cleanser ought to be changed having a high-flowing unit. A number of performance air cleansers are for sale to injected engines. Make sure to match a brand new air cleanser for your year and type of injected engine.
After you have installed a higher-flow air cleanser, a bigger throttle body can be viewed as to help increase air flow with the intake tract. However, you can't treat the intake tract as a lot of individual parts. Rather, you should think about it as being an entire system of interdependent components, in the air cleanser and TB towards the manifold and cylinder heads, which must fulfill the air flow needs from the engine for any given application. Here's the purpose: Improving parts individually or perhaps in a physically consecutive order might not provide the greatest results. For instance, it might be smarter to upgrade the cylinder heads prior to the TB or doing both simultaneously. As you bottleneck within the product is removed, another impasse becomes the following restriction. Quite simply, you finish up moving the bottleneck somewhere down the road. However the new performance limitation is not always situated immediately upstream in the old impasse. The real bottleneck should always be recognized.
Anyway, returning to the TB - it's the EFI equal to the carburetor, with one major difference: A TB only flows air. Injectors downstream from the TB supply fuel towards the engine. TB design varies with respect to the year and type of the EFI system. Magneti-Marelli systems were utilised from 1995 through 2001 and Delphi systems from 2001 to provide. However, periodic updates were designed to scalping strategies, so make certain that the new high-flow TB fits your engine and EFI electronics.
The stock Delphi TB throat is all about 46mm. Performance throttle physiques varying between 48mm and 60mm as well as bigger can be found. Since a fuelinjected product is only flowing air in the air cleanser inlet to around the intake port (in which the injector is situated), TB sizing isn't as critical as carburetor sizing, but it's still important since it can impact idle quality and acceleration. Ideally, you need to match throttle bodily proportions towards the engine's horsepower level and never displacement, because horsepower is simply based on air flow. However, because so many engine contractors think when it comes to engine displacement, listed here are couple of very general TB sizing recommendations, with focus on the term "general": 48mm The best spinner's work nicely for mildly modified engines, 50mm The best spinner's prosper on 88-ci to 95-ci engines, 54mm The best spinner's for 103ci to 113ci engines, and 54mm and bigger The best spinner's for 113ci and bigger engines. Talk to your engine builder and tuner for additional specific information. Furthermore, make certain your original equipment EFI parts and electronics are fully compatible with a brand new TB.