Akrapovic - Is There A Special Mapping?

Which dealer told you about a special map for the Akra?

No, you can install any muffler you wish it will not need anything adjusted.They do
want the bike to idle with no throttle input so if temps are high or are going to idle
for more than 3 to 4 min use a blower fan infront of radiators to not over heat.

The only 2010 berg that needs the reflash is the 390, but other maps can be installed
with the ok from the boy's at husaberg.

I believe I know a lot about fuel injection, but have zero experience on a Fuel Injected Husaberg. Feel free to correct me as I am nervously replying thinking I have over looked something.

Typically a Fuel injection system can only adjust a map from feedback from 2 things, the oxygen sensor and a knock sensor. The rest is statically configured in the map. Statically configured includes, Air Temp. Coolant Temp, Throttle position and MAP Sensor.

Basically a Fuel injection system reads the Cam Position Sensor, the Crank Position Sensor to know where the motor is in the cycle, it then reads the MAP Sensor and RPM and works out how much fuel to inject and at what timing to fire the spark plug. In summary if the MAP Sensor is showing no vacuum and lots of RPM it pump heaps of fuel in because it knows you have the throttle wide open. It also sets the timing at a safe margin not to detonate (knock or ping).

If the Map sensor sees High Vacuum and lots of RPM it knows you have the throttle shut and shoots less fuel into the motor.

If it sees Vacuum and low RPM it knows you are idling and dribbles in Fuel slowly.

If it sees the Throttle position sensor change value, indicating you opened the throttle quick, it pumps in heaps of Fuel. This emulates the little accelerator squirter pumps you see on old carburetors like a Holley.

Now what happens if you change the Muffler to make it more free flowing? I am not 100% sure, but let me tell you no Fuel Injection system can relearn itself by idling for 5 minutes that is for sure. At best it may relearn the idle mixture if the Oxygen Sensor feeds back information. It will not relearn Mid Range and Wide Open Throttle settings (Commonly known as WOT). The typical Oxygen Sensor in a Fuel Injection System is not accurate enough to learn anything. They are only there to adjust light load type cruising.

In fact, all fuel injection systems I know do not even look at the Oxygen Sensor for feed back at WOT.

I don’t believe the Husaberg uses a knock Sensor so no Timing changes can occur in the Map either by letting it idle for 5 minutes. The only time Timing will be adjusted outside of the standard settings in the Map are when Coolant Temp is High or Air Temp is High. It will retard it.


By the way I am not a very good rider and my bike is a Yamaha TT250. I do have a friend that has a Husaberg 6Fidee and he can slide that thing on the open trials so good he makes Jason Crump look like a girl 

You are right Davo. Thats my experiens too.

Great info davo,However akrapovic does not make a map for the use of there muffler,
nor does husaberg offer one.As per letting bike idle is for new unit's on pre delivery
as per husaberg's suggestion.I have installed an akro slip on on 4 of my own 2 09's
& 2 10's with no issue what so ever. Also installed 4 leo vince slip on muffler's for
customer's purchasing 09 models with same results.I was only answering the question
asked.

BOSS I am jealous you have 4 Husabergs and I only have a clapped out old 1991 TT250 :lol:

Woops had a few beers when I wrote the Fuel Injection stuff. Should have done it sober I would have done a better job :wink:

I am keen to learn more about Husaberg Fuel Injection and their MAPS. I can't wait to ride an injected Husaberg with the MAP Switch. I would like to know exactly what it does to the MAP settings and excatly how much it changes Timing and the rate of attack of the Timing

This is a great Forum site guys. BOSS and TAFFY have great web sites too.

There is lots of great info flowing through here every day thats why I read,learn &
answer when i can. By the way I only have one or two new bikes at a time. Selling
this new generation model has been easy!

As we get more of these bikes out there. And the mapping hardware becomes more accessible (less money!!!). We will see some custom maps coming out of shops that tune FI bikes. Or maybe it doesn't matter.

When we picked our bike up from husaberg uk they flashed trhe ecu with an ackro map whilst i waited for it,i then fitted the fullsystem and run it for 5 mins , so either there is a map or my dealer is telling me things he wants me to hear ? :cry:

That map was istalled on my bike too bud it doesn't works.The same results or without the akramapping.If you want be sure put the bike on the bench and you will see the results and the air/fuel mix if it is good.With me it wasn't good at all!
greets

I HAVE A BERG 390 NEW AND I AM INSTALLING AKRAPOVIC TIT/CARB EXHAUST, SOME FRIENDS TOLD ME THAT THE 390 IS GOING TO GIVE ME SOME ISSUES WITH THIS EXHAUST WHILE BREAKS IN, ANY SUGGESTIONS ??? COMENTS ??? SOLUTIONS ???

THANKS.

I bought a 390 and it runs lean, back fires when i shift down to second or first gear, however probably just like you I need to have ECU unit re flashed and that should take care of the problem. California emission laws... Really like this bike!

Re: Akrapovic 390- Is There A Special Mapping?

Kurts78

What was the outcome with with the 390 and your Akrapovic instillation and the map, I’m putting on a slip-on akra muffler and the dealer is telling me that the bike needs reflashing. 2010 390 is open loop efi, no exhaust sensor, I checked the pipe. So what I can't figure and he (dealer can't tell me) is if there is a specific map for the akra can, can i still use the other maps via the switch(soft, standard, aggressive)or am I stuck with one map.I thought it must reflash the existing maps, the dealer seems to know as much as me ,which is a worry. New technology I guess.

Wow even I had a crack at this post awhile ago.
Here is an update, when my rear tire was knackered I rode my Husaberg on the tar to the local Cafe for a Cappuccino . The Burger always seems to get someone’s attention, this time it just happened to be a Keihn EFI expert. Turns out the Keihn EFI system is used on a few different makes of bikes, that this guy tunes. He was riding an Orange Pumpkin (Pewk), and told me he could re-map my bike so it was better, I said “Why? The thing is perfect”. I have tuned a few Autronic EFI car/boat systems so looked at him bewildered. I ended up seeing him a few more times and started asking some specific questions about Keihn EFI. So here is a summary from what I learnt from him:

There are 2 main EFI Maps in a Husaberg.
An EFI Map is generally a 2 dimensional table, with one axis the RPM and the other axis TPS or MAP (TPS = Throttle Position Sensor and MAP = Manifold Absolute Pressure Sensor). Basically you can tune (or in EFI speak “Map”) an engine by changing the points where the RPM and TPS or MAP sensor readings meet. The result is the Fuel Injector is opened for a shorter or longer time (Duration). I am not sure if I explained that too well, but trust me it is not that hard. I have only ever tuned RPM/MAP EFI tables, so an RPM/TPS table was new to me.

Basically the engine needs more fuel at higher RPMs and either Higher TPS openings or Less Vacuum (MAP sensor measures Vacuum). The Fuel Map settings can easily be adjusted by reading the Air/Fuel Ratio via an external meter and changing the Map points on the table. This is something best done on a Dyno. With a Dyno you can vary the load on the engine and pretty much Map (tune) all the points in the 2 dimesional Map table except the trailing throttle. Trailing throttle is when you shut the throttle down real quick and the engine starts to slow down, you can’t ever get that accurate but it doesn’t matter because the throttle is closed anyway. When going down hill in 1st gear I can feel the Keihn EFI system completely shut the fuel off on trailing throttle (that is a guess).

Anyway, back on the subject, there are 2 Maps. The Keihn EFI system uses RPM and MAP as the first Map. Then it switches to RPM and TPS somewhere defined by an RPM point. This RPM point is changable. He explained because of the small volume of the Husaberg inlet manifold, or because the Throttle Butterfly is so close to the Engine Inlet Valves, it is difficult for the MAP sensor to get an accurate reading, so it swaps to TPS. That sort of makes sense to me.

Having 2 Maps in the Husaberg that change at a certain RPM makes it a little hard to understand. So it is no wonder that no one knows what happens to Air Fuel Ratios when an Akra is installed. I bet someone knows? Gazza? I have been tinkering on EFI for yonks, and I have no idea what would happen with a Akra installed. So I reckon Dealers would have no idea. Happy to be corrected on that point :?

The only true answer is to install an Air Flow Ratio Meter and measure the result. If the engine runs lean at certain RPMS/Loads it needs re-mapping. I can post a picture of an Autronic Fuel Map if anyone is interested in EFI Maps?

There is also a Timing Map in EFI systems. This is really hard to change as you cannot connect a “meter” to show you if it is correct or incorrect. Yes, there are “Knock Sensors” but they sometimes are not that reliable/accurate. This is where you need the real “Guru” to set the Map. Someone that can "feel/sense" an engine pinging. One day I hope to see Taffy selling the “Super Aggressive” LDC MAP with all these Fuel/Timing settings just perfect. Maybe even the Taffy LDC Camshaft and “Super Aggressive” EFI Map.

On top of the basic Map are corrections to the Map based on certain things:
Air Temperature (Probably the main thing that corrects the Map)
Altitude (Not sure how Keihn do this but am keen to find out)
Coolant Temperature (basically multiples the Fuel by a certain factor when cold, emulates the choke on a carby)
Not sure if I forgot any correction things? Is there anything else?

Starting an EFI engine is an art. EFI systems do many different things for this based on temperature and what ever else they can think of :?

I can't speak to the Akra issues. Not really interested as I doubt I will want one. Most of the time I am happy with how the bike acts. I ride slow and I ride technical trails. The bike seems very well setup for that, although if I shut off the throttle under load up a hill it can slow down abruptly.

My main complaint is when I am riding on pavement to get to the trails (I don't have a way to haul the bike yet). I have noticed that under very light load/throttle the EFI "hunts" - i.e., just a bit of up and down in the RPMs - enough to be noticeable but not enough to be really objectionable. Makes me think the bike might be running a bit lean, or maybe the sensors aren't quite right. It does this on any of the map settings and at different RPMs as long as the load is light - i.e., when you are just barely putting along with very little throttle and load, so little that the bike is on the verge of coasting.

Davo

Thanks for the breakdown,makes things easier to understand,I will post my experience with next week after hooking up the efi with the dealer,and let you know what the outcome is re the mapping.Sure there will be many more punters wanting to install the akrapovic on the 390 and hitting this issue.Knew i should have got the 450

I have noticed that under very light load/throttle the EFI "hunts" - i.e., just a bit of up and down in the RPMs

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Hey Codemonkey I don't notice that on mine. I wonder if it is because yours is the 09 model with an Oxygen Sensor running in "Closed Loop" Mode? I am guesing you are feeling the EFI Computer reading the Oxygen sensor at light loads and adjusting the EFI Fuel Map.

The bike seems very well setup for that, although if I shut off the throttle under load up a hill it can slow down abruptly.

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I love that "shut off" feeling going down a steep hill, the engine braking in 1st gear and throttle closed is sensational. I can't judge how it effects me going up hill, my riding skills are crap :? I will pay more attention on the next steep hill.


I look forward to your future post husapye after you talk to your dealer. I find the EFI system interesting.

I don't think the US models use the oxygen sensor - that is what I have been told. They don't have the catalyst in the exhaust either.

I don't really notice the fuel shutdown that much on downhills - possibly in part because the downhill drives the engine to keep running faster, whereas uphill you have the opposite effect. I just remember a few times on an uphill where I backed off the throttle to slow down because I was offline or to encounter an obstacle and the bike seemed to slow abruptly.

Possibly the difference in perception can be attributed to the fact that I am an inexperienced rider, I haven't ridden dirt bikes of late off-road and I ride slow.