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Exhausts Exhausts - Headers, Mid Pipes, Mufflers


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August 2nd, 2020, 05:14 PM   #11
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The header and mid pipe are different on the 570
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August 3rd, 2020, 05:44 AM   #12
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Front pipe :

type 1 : 390/450
type 2 : 570

central pipe :

390/450/570FE : pipe on the 570, the front pipe and central pipe change

type 1: lambda senror : 81205008000
type 2 : not lambda : 81205108000

pour la 570 FS :

type 1 lambda sensor : 81205208000
type 2 not lambda : 81205308000

silencer / muffler : identical I think
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August 3rd, 2020, 10:04 AM   #13
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Thanks for the info so far!

I had been interested in the Akrapovic system, was a complete exhaust with an expansion chamber on the mid pipe. I donít see them available online anymore but am wondering if anyone has experience with them and in particular wether or not the expansion pipe made a noticeable difference.
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August 4th, 2020, 12:05 AM   #14
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the reflash is what you need. so chase that aftermarket OK? the dealers are connected to the factory. when they re-flash they have to put in the chassis number etc and as yours is already a street plated bike its a bit late to say "MX use only".

so you'll have to do it away from KTM/Husky dealers.

as far as pipes go, the pipe on the 570 is the pipe on the 390/450 I think. the only reason they are different part numbers is because the barrel on the 570 is longer so it needs a different shape. nothing to do with power.

there's nothing wrong with the original exhaust and if Rainiero knows a trick with the inside of the silencer then get it done.

fuelling and igninition.

the valves are huge, the exhaust is huge, the injector is huge. look at a belmouth.

look for another cam. maybe rainiero knows but, I have never seen a performance cam for these off the shelf have you?

that stuff about the exhaust...its bollocks, absolute phuqing tosh.

Taffy
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August 4th, 2020, 03:25 AM   #15
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Fully agree with Taffy. That is what I understand from talking to people here and there.

One source I trust is Ljunggrens motor in Sweden where I bought my 570. He had put an acra header on the bench and it showed no more HP than stock, it had however 2dB less.
He told me that one could have a different, more open, silencer to remove some heat and it could benefit top end. But it wasn't much of a difference.

I have heard from a different source that the HP benefit compared to stock is negligible, that it even might be a loss. But then people talk about engine characteristics, loose top HP and gain in curve. I will not touch that as there is so much psychology with sounds

Tomtom has found out, amongst other tuners, that the bottle neck is to get air into the engine. But that is for 570s as they are based on the 390/450 using the same throttle body.


Imho a 390 is very good as it is. Just make sure your injector and air filter are clean. You could try to tune it following Alans advice if you like to make it a bit richer, and maybe even open up the silencer as Rainero says.

What make people believe these bikes are tamed, that they have more to give, is the very nice mapping curve. They deliver in a very linear fashion. Accelerate next to a "wilder" machine and I'm quite sure you will keep up with it
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August 5th, 2020, 01:15 PM   #16
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You guys are so smart!

Funny thing is that this is the nicest bike Iíve ever had and I love it! Iím 155 lbs with all my gear during riding season, my power to weight ration on this thing is just fine. Thereís nothing wrong with my 390, just thought a couple tweaks might open things up.

FWIW it was more than one tuner who told me the muffler is a bottle neck. As I understand it heat buildup has been a big issue with these bikes and the muffler is a known culprit. Mine has the fan (installed by the dealer as I understand it) which kicks in when Iím working hard, technical, uphill stuff but otherwise doesnít seem to be on too often. I pulled the fuel pump and double checked the tank for the notorious white goo but all is fine. My bike runs great!

I may try the EJK fuel controller as an experiment regarding running richer and to see how it changes things at altitude - Iím riding at 8000í - 12000í routinely out here in Colorado.

Thank you all for keeping me in check
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August 5th, 2020, 01:19 PM   #17
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Regarding pipes and mufflers - Iíve got other bikes that gained HP from a straighter muffler flow but lost torque. Almost everything I really press this bike for requires torque/grunt. Just another reason to STFU and ride as is.
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August 5th, 2020, 01:52 PM   #18
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The perceived need for exhaust back pressure is largely a myth. The air needs to get in and out of the engine (air pump) as efficiently as possible.

I find it very hard to believe that with proper tuning a straight through design muffler is not going to provide benefit over the stock part. I have had both OEM versions taken apart and each has massive impediments to flow even if you cut down the rear outlet tube on the "better" version.
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August 5th, 2020, 02:12 PM   #19
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Part of that flow/pump is a harmonic pulse which helps with scavenging. My understanding is that a ďstraightĒ flow is relative.

Iíll hunt around for an FMF or similar that will replace the factory muffler and add the EJK fuel programmer. If I can find a local dyno will do a before and after, no harm in learning for all of us. Oh, the rabbit holes...
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August 5th, 2020, 03:10 PM   #20
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I could be wrong but feel like tuning for pressure wave scavenging on a small displacement single cylinder likely provides negligible gains. I think there is far more benefit to removing restriction and hopefully keeping some heat out of the exhaust given the issues the 70 degree bikes have with fuel temperature.
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