Akrapovic - Is There A Special Mapping?

E-Ticket, thanks for the compliment.

What I understand about what Davo is saying on his last reply is that "the burn" is doing nothing on a open-loop no oxigen sensor model. So, what about in a oxigen sensor model?

In the case that "the burn" does nothing, It will not do anything wrong to the engine either, right?

I think I will do "the burn".

Hasta luego!

BUXO said:

E-Ticket, thanks for the compliment.

What I understand about what Davo is saying on his last reply is that "the burn" is doing nothing on a open-loop no oxigen sensor model. So, what about in a oxigen sensor model?

In the case that "the burn" does nothing, It will not do anything wrong to the engine either, right?

I think I will do "the burn".

Hasta luego!

Click to expand...

It will cause no harm ... as long as it doesn't overheat and lose coolant! :^)

Some people put a fan in front of their bike ... others park it in an open, breezy area. Cheers! - ET

Hi BUXO,
These are my thoughts which could be 100% wrong. It's just theory that I have learnt from tinkering with other Fuel Injection systems. Just a hobby of mine:
The "burn in" thing is correct for some KTM bikes but not for the Husabergs. Including the models using the Oxygen Sensor and the models not using the Oxygen Sensor.
I have no idea if a free flowing Akra will make a Husaberg run lean. I suspect not as there are plenty of people out there running them and I have not seen anyone on UHE mention that they needed their EFI Map changed or remapped.
A lot of EFI systems run in open loop mode (they ignore the Oxygen Sensor) at Wide Open Throttle and I am guessing the Husaberg EFI does this too. So the models with the Oxygen Sensor would adjust the mixture to suit the Akra, but I believe they could only do this while they were riding through the different engine load and rev ranges, (only when in Closed Loop mode). I cannot understand how an EFI system could sit at idle and adjust the Fuel mixture for engine loads it has not been at. My thinking is a EFI system needs to be at a particular RPM/Load, then look at the Oxygen Sensor, then adjust the Fuel Mixture (by Mixture I mean EFI Fuel Map). It would really would be a special computer if it could change it's Fuel Map without even being at the specific point that it feels it needs to change. It would be like predicting the future. Hey, does anyone know if Nostradamus mentioned anything about Keihin computers in his collections of prophecies? :lol:

Like I say I could be wrong, so put the Akra on, let it idle for 15min and ride. That way you have all bases covered.

Hi,

Finally I installed the Akrapovic and I did the 15 min run at idle. I removed the two front plastics covers from the radiators and used two fans blowing the air directly to the radiators, not overheated but got really hot.

After the run, I went for a ride and the first thing I noticed was less low revs power compared to the stock silencer, not too much difference but something. And didn't noticed any gain at high revs. But after about one hour riding, I felt a small gain in power at high revs, and still the same in low revs (a bit less than stock).
Now, after riding the bike three more times I feel the same, less low rev power and more high rev power, (I don't know if in english you say high or lo revs...) with the same mid rev power.

My conclusion is that the run did NOTHING. Because the first kilometers I didn't feel any gain in power, and after one or two hours of riding it, I felt the gain in the high revs.

Another conclusion is that I was expecting a big gain of power in the hold band of revs, and what I got is a bit lose on low revs an a bit gain on high revs.

Now I really wonder if there is any flash or remapping that we can do to gain power with an open silencer.

By the way, I did everything with the db arrestor removed.

I weight both silencers on a precise digital scale and the stock one was 2.5 kgrs and the Akra was 1.6 kgrs. So only 0.9 kgrs of gain.

The dealer told me that if I install the Akra db killer (or power bomb) manifold I will really feel a gain in the low revs with a reduction on the noise.
Does anybody installed it?

This is my opinion and experience, I hope it can help.

Hasta la vista.

BUXO said:

Hi,

Finally I installed the Akrapovic and I did the 15 min run at idle. I removed the two front plastics covers from the radiators and used two fans blowing the air directly to the radiators, not overheated but got really hot.

After the run, I went for a ride and the first thing I noticed was less low revs power compared to the stock silencer, not too much difference but something. And didn't noticed any gain at high revs. But after about one hour riding, I felt a small gain in power at high revs, and still the same in low revs (a bit less than stock).
Now, after riding the bike three more times I feel the same, less low rev power and more high rev power, (I don't know if in english you say high or lo revs...) with the same mid rev power.

My conclusion is that the run did NOTHING. Because the first kilometers I didn't feel any gain in power, and after one or two hours of riding it, I felt the gain in the high revs.

Another conclusion is that I was expecting a big gain of power in the hold band of revs, and what I got is a bit lose on low revs an a bit gain on high revs.

Now I really wonder if there is any flash or remapping that we can do to gain power with an open silencer.

By the way, I did everything with the db arrestor removed.

I weight both silencers on a precise digital scale and the stock one was 2.5 kgrs and the Akra was 1.6 kgrs. So only 0.9 kgrs of gain.

The dealer told me that if I install the Akra db killer (or power bomb) manifold I will really feel a gain in the low revs with a reduction on the noise.
Does anybody installed it?

This is my opinion and experience, I hope it can help.

Hasta la vista.

Click to expand...

I have the 92 db, spark-arrestor insert installed in my slip-on Akropovic exhaust on my 2010 FE 390.
I like it! I have tons of low-end power, I don't care about the very top-end as I am a "short-shifter, and I very much like the lower noise level.

Hope this helps. Cheers! E-Tciket

When an acra slip-on is installed a 4 min burn-in period should be done. That is to warm up the wool correctly in the slip-on for the first time (its in the acra manual). The husaberg EFI dont benefit from a burn-in (as already stated in this thread).

BUXO. I have a FE570 -12 (apart from the yellow frame a -11) that I installed an acra slip-on on. I experienced a definitive change to the better! Much louder too... I do however use a custom mapping, but that was installed when I bought the bike. I asked about the mapping when I bought the acra and got the answer that I dont have to change mapping. If that is because I already had a map that was good for acra or if it dont matter I dont know. My point is as I did get more power with the acra, and I can use the same mapping for the stock and acra muffler (then I have never run the stock map).
I also asked about the acra header and they told me that they dyno tested it and couldnt see much of a change. It is a few dB more silent though, but hardly worth the money if you want more effect. I havent tried it myself though, but that is what they told me.

Hi Jon,

The information you have about the header dyno, is with the stock or an Akra slip-on?
Do you have any dyno information stock vs Akra slip-on?

As I said, I felt a bit of better response on high revs, but just a little.

All the people that I know with an Akra header installed told me they felt a really big difference..., I want to try one...!

Enjoy the 570, really great bike.

Carlos.

I also asked about the acra header and they told me that they dyno tested it and couldnt see much of a change. It is a few dB more silent though, but hardly worth the money if you want more effect. I havent tried it myself though, but that is what they told me.

Click to expand...

That was with an acra muffler.

As I have no figures or personal experience I cant say how much/little the difference is. If you know people that do feel a positive change it might be worth it I dont know, maybe best to try?

Yes, the FE570 is a lovelly bike. So strong its more than a handful when its tricky and I'm tired, but so fun and versatile!!

Hi,

so like others I myself have also purchased a Akrapovic Muffler for my 2012 FE390. From what I've read the "burn in" (apart from the Akra warm up for the first time) does nothing.

I'm still not sure what the go with the mapping is? I suppose I'll fit the muffler take it for a ride and get back to you on how it performs and how the motor reacts to the new pipe.


What i would like to ask is about the Akrapovic pipe spark arrestors.

In the install manual it says "When using the main silencer on a de throttled vehicle with open mapping, the spark arrestor must be replaced by the additionally supplied spark arrestor insert.....Otherwise there is a danger of engine damage"

What does it mean by "de throttled and open mapping?"

It comes standard with the homologized insert, it also comes with an open spark arrestor insert. Can i run the pipe without an insert at all without causing damage?



Thanks!

Thurston said:

Hi,

so like others I myself have also purchased a Akrapovic Muffler for my 2012 FE390. From what I've read the "burn in" (apart from the Akra warm up for the first time) does nothing.

I'm still not sure what the go with the mapping is? I suppose I'll fit the muffler take it for a ride and get back to you on how it performs and how the motor reacts to the new pipe.


What i would like to ask is about the Akrapovic pipe spark arrestors.

In the install manual it says "When using the main silencer on a de throttled vehicle with open mapping, the spark arrestor must be replaced by the additionally supplied spark arrestor insert.....Otherwise there is a danger of engine damage"

What does it mean by "de throttled and open mapping?"

It comes standard with the homologized insert, it also comes with an open spark arrestor insert. Can i run the pipe without an insert at all without causing damage?

Thanks!

Click to expand...

Some thoughts:

== De-throttled: I believe they are referring to having removed the Euro noise and throttle restrictions. Also possibly the noise diffuser in the stock exhaust. And depending on country, the catalytic converter?
== Open mapping: the Husaberg's FI is "open-loop". That means that there is not an O2 sensor in the exhaust telling the FI ECU that the engine mixture is too lean and that it needs to richen the fuel/air mixture. Therefore it can't compensate for a freer-flowing exhaust ... and the engine will run lean.
== Additionally supplied spark arrestor: This most likely means that the additional SA is more restrictive and will produce more back-pressure. Which will slow down exhaust gases which helps avoid a wide-open lean condition.

Cheers, E-Ticket

I read it the opposite. I got two spark arrestors with my acra. A more restrictive spark arrestor was in from the beginning. That one is made for the throttled new bike when it still got the legal restrictions in. That spark arrestor got that plate with holes in it just like the original muffler had when it was new. If you de-throttled your bike by taking away the crap that makes it into a legal moped and still use that restrictive spark arrestor it will create too much pressure, which can damage the engine. Then you have to use that additional spark arrestor as that one does not restrict too much. Or you can even remove the spark arrestor completely for full effect, but with much more dB
You don't damage a 4-stroke with less restriction, you damage it with too much as the pressure will build up if its not released properly.

jon andersson said:

I read it the opposite. I got two spark arrestors with my acra. A more restrictive spark arrestor was in from the beginning. That one is made for the throttled new bike when it still got the legal restrictions in. That spark arrestor got that plate with holes in it just like the original muffler had when it was new. If you de-throttled your bike by taking away the crap that makes it into a legal moped and still use that restrictive spark arrestor it will create too much pressure, which can damage the engine. Then you have to use that additional spark arrestor as that one does not restrict too much. Or you can even remove the spark arrestor completely for full effect, but with much more dB
You don't damage a 4-stroke with less restriction, you damage it with too much as the pressure will build up if its not released properly.

Click to expand...

Thanks for the input, I read it in a different perspective and I think your right it's basically saying if the bike is open mapped and de-throttled the replacement insert must be used (because the other one would be too restrictive like you said)

I plan on running it without a DB killer at all (private property ) but on the street and trails i will run the open style insert. Although the other week i tried starting the bike without the slip-on... FI doesn't like that at all! Wouldn't start. I've started a carby bike without a muffler...oh well FI has it's benefits!

My bike being delivered in Australia come without the exhaust sensor and the dealer removed the restrictor in the Airbox and the screen in the standard exhaust.


Thanks for your help!

I installed a FMF Q4 silencer on my 11' 570 mainly to dissipate the heat that was frying my. While I am not a good enough rider to discern an increase in power, there was a definite change in the way the power is delivered. Not sure on the correct terminology here, but the bike seems to wind up much faster than it used to. Where I feel the difference is when I twist the throttle, it just seems to "get there" much quicker. The front end pops up easier to cross obstacle and when twisted, it just seems to go into that "bat outta hell" mode faster that we all seem to love about the Husabergs! Not sure if I am making sense, but it just seems like some weight or restriction has been lifted from the bike and it wants to run. I did not do any re-map.

My 2011 570s .. my dealer installed the comp map before I picked up the bike. I noted it had great low end torque but the top end fell off and I could not even hit the rev limiter. I put on the cheaper akra slip on (came with only one insert) and the difference is incredible. I cant beleive the amount of power this bike makes now. I would say 25% increase.. and thats alot of HP. I have 15/47 gearing, and the front end pops up and stays up now in 3rd gear (no clutch).. before the akra, no matter what I did, I could not acheive 3rd gear power wheelies. When I took the akra silent insert out the bike just got loud, no power increase, and if any thing, power decreased a bit. Sound is nice and deep, soft, tone which is exactly what I wanted.

Thats good to hear Tiger, i can't wait to install my Akra now! Not that i have ever gone out and tried to power wheelie but i can't say my front end pop's up that great without the clutch. Bikes in the shed in pieces, wow what a pain in the ass the tank is! Currently fitting thermo fan, B&B rad guards, Barkbusters and the Akra should be back together on Monday and ill be sure to update everyone on how the 390 runs with an akra.

I messed up when i put the bike back together temporary to start it up (had just adjusted the throttle cable) i put the airfilter back on...but forgot about the chux wipes i left in the throttle flange to stop crap falling in... started it up, started fine but run like crap open the throttle a bit just seemed worse. Left the bike running for 30 seconds then shut it off. Pulled the air filter off and could see the wipes stuck in the butterfly (F***!!!), pulled the throttle open and slowly pulled the wipes out, got them out fine luckily.

took the bike out for a ride down the street seemed to run fine after that, is there anything i should be concerned about?


Thanks

Thurstin I did the SAME thing.. left paper towel stuck in the throttle body.. I ran down the street.. it almost sucked the towel into the intake valves.. ha ha .. what an idiot I am.. no theres nothing to worry about.. just run the bike it will take care of any small pieces left in the intake.

I would think the 390 will definately like a more free flowing akra post results when you get them im curious merry chrismass

You are planning to ride the bike without any insert in your acra,try it you will notice that it won't run easy in high revs anymore,on my 570 mounted acra i cut off the spark arrestor screen bulb from the included insert, does not make alot different in noise what is important for me ,depends what inserts you have is it an (short open) mx insert ,iff it isnt try first the same as i did ,or cut off the insert pipe untill you have only the ring as insert,then you will probably get the best result
merry cristmas

dutch gunsmoke said:

You are planning to ride the bike without any insert in your acra,try it you will notice that it won't run easy in high revs anymore,on my 570 mounted acra i cut off the spark arrestor screen bulb from the included insert, does not make alot different in noise what is important for me ,depends what inserts you have is it an (short open) mx insert ,iff it isnt try first the same as i did ,or cut off the insert pipe untill you have only the ring as insert,then you will probably get the best result
merry cristmas

Click to expand...

Well it goes on tomorrow but won't get a proper ride until next week, so ill have a play around with the inserts. At the moment it's got the free-flowing insert in, took the one with the plate and holes in the end out. I might try what you said with the restricted insert, ill dremel/cut out the plate with holes and take off the bulb thing.

T_i_G_e_R said:

Thurstin I did the SAME thing.. left paper towel stuck in the throttle body.. I ran down the street.. it almost sucked the towel into the intake valves.. ha ha .. what an idiot I am.. no theres nothing to worry about.. just run the bike it will take care of any small pieces left in the intake.

I would think the 390 will definately like a more free flowing akra post results when you get them im curious merry chrismass

Click to expand...

That makes me feel much better, I even thought to myself when i put the rags in there that i'd forget about them and end up strating the bike...well i did haha. Yeah i recon the Akrapovic slip-on will top the 390 off perfectly.

Will post up results soon

Merry Christmas!

I found it at the X-mas tree . I will let you know the result and feeling after fitting to my bike and some test ride...
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I almost bought a used one before I found out there is a different part # for the 390/450 and the 570. I have a 570 and the used one was off a 450. What bike are you putting this on? I would like to know how much the sound drops. I have a carbon fiber Arak silencer.

Is the exhaust flange different between the 390/450 and the 570 does anyone know? If that is not the difference then all I can imagine is the expansion chamber is tuned differently.