Twin Arrow Exhaust by Husqvarna

[MrClean]

Oneleven - Any noticeable power gains? Does it rev-up faster? Anything else you can tell us in terms of improved performance?

I think Husky claims a 7 or 8 HP gain with the Arrows/ECU. If that's true, it should be an obvious seat-of-the-pants improvement.

 

[oneleven]

Lemme get back to you on that. I'm gonna swap the exhausts on Friday(raining) Saturday Friday (sunny after all) and try to do a comparison. I'm not sure if the power has improved by much to be honest. I know handling has improved with the weight loss.

 

[organ donor]

Installed the p/u plug AND the twin Arrows at the same time. Registered the result with a sigh of relief, as it was the bike I´d wanted all along. Before that, the bike, as delivered out of the box was a COW (it regularly died idling in traffic, had no power and felt very heavy). E3 conformity seems to make uncorking necessary on most bikes nowadays.

 

[oneleven]

Please disregard my previous statement. Somebody must've slipped me a doobie. I quickly forgot how sluggish the stock pipes are, after putting on the Arrows. Bike has labrynth removed and PU kit. Broken in as instructed in the manual.

OEM
Pro: - it's quieter
Cons: - response is a little slow. It takes a bit of time to get up to speed with how far you've twisted the throttle.
- there's more vibration throughout the bike
- sound isn't as pleasing to the ears
- heavier: left pipe (3kg 259g) right pipe (3kg 274g)

TWINS
Pros: - throttle response is almost immediate. I concur with organ, this is the way the bike should've come. Twist the throttle and it just goes.
- sounds awesome
- revs faster
- runs much cooler (I can put my hand right on the pipe anywhere after a run)
- lighter: left pipe (1kg 746g) right pipe (1kg 742g)
Con: - expensive
- louder, but not by much

...If that's true, it should be an obvious seat-of-the-pants improvement.

Yes, definitely!

 

[oneleven]

DB test

Testing was done in a secluded spot. Ambient sound level: 43 DB. Sound meter is a new Reed ST-805 mounted on a tripod pointed at the exhaust tip (same height) 50cm behind at a 45 degree angle. Accuracy +-1.5db



OEM @ idle 79.8 DB @ 2000RPM 82.3 DB @ 5000RPM 89 DB and right up close @ 5000RPM 92.1 DB

 

[oneleven]

Ambient sound level: 50 DB

Arrows @ idle 83.8 DB @ 2000RPM 84.1 DB @ 5000RPM 90.4 DB close @ 5000RPM 91.5 DB

 

[HuskyBrutha]

Ambient sound level: 50 DB

Arrows @ idle 83.8 DBView attachment 9172 @ 2000RPM 84.1 DBView attachment 9173 @ 5000RPM 90.4 DB View attachment 9174 close @ 5000RPM 91.5 DBView attachment 9175

Interesting readings - the arrows are not much louder , or does the 7dB difference in ambient noise make a difference so if
OEM @ idle 79.8 DB where ambient sound is 43 dB
and
Arrows @ idle 83.8 DB where ambient sound is 50 dB
then does this mean that to be comparable
Arrows @ idle 83.8 + 7 (50 - 43) DB = 90.8 DB where ambient sound is 43 dB ?

 

[MrClean]

OEM

Cons: - response is a little slow. It takes a bit of time to get up to speed with how far you've twisted the throttle.

That's my number one complaint right now with my SM630. Especially compaired to the throttle response of my TE310. I know the two aren't going to be the same. But like you said, the 630 has a little slowness between the throttle and the revs. And that's with all the power-ups done. Don't get me wrong.... The bike runs great . But, the power just doesn't come-on like a dirt bike.

Thanks for posting. You just convinced me to drain my checking account...

 

[oneleven]

Interesting readings - the arrows are not much louder , or does the 7dB difference in ambient noise make a difference...

I don't think ambient matters as long as it's not any louder than the exhausts. Dunno why I included that. The meter has a max hold that displays max db level. Revs were held for about ten seconds to get a good reading.

That's my number one complaint right now with my SM630. Especially compaired to the throttle response of my TE310. I know the two aren't going to be the same. But like you said, the 630 has a little slowness between the throttle and the revs. And that's with all the power-ups done. Don't get me wrong.... The bike runs great . But, the power just doesn't come-on like a dirt bike.

Thanks for posting. You just convinced me to drain my checking account...

You're welcome. I'll be putting away my stock pipes on the shelf for good.

 

[MrClean]

- runs much cooler (I can put my hand right on the pipe anywhere after a run)

Wow! My hand will catch on fire if I touch the stock silencers after a ride.

 

[rjdenya]

Oneleven, regarding your comparison, why the change in where you put the sound meter at 5,000 rpms? You said "close" and "right up close." There is no way on earth the OEM pipes are anywhere near louder than the twin Arrow pipes...at any RPM. To be a truly accurate test all conditions should be equal. If not please explain.

 

[oneleven]

Oneleven, regarding your comparison, why the change in where you put the sound meter at 5,000 rpms? You said "close" and "right up close." There is no way on earth the OEM pipes are anywhere near louder than the twin Arrow pipes...at any RPM. To be a truly accurate test all conditions should be equal. If not please explain.

"close" "right up close" It was just for ships-n-giggles. The carbon end didn't allow the mic to get as close to the exhaust hole. I don't claim to be an expert at this sort of thing.

Googling "motorcycle exhaust db test" usually brings up the standard '20in away at a 45 degree angle'. I'm just a guy who bought a cheap sound meter and did a quick test.

 

[rjdenya]

Ok, sounds good...no pun intended

.

 

[oneleven]

I am disappoint. 45 RWHP

I rode over to DaytonaMotorsports in Surrey,BC today where they had a dyno setup in the parking lot. Put in fresh oil and filter yesterday. (Maxima 5W-50 +Hi-flo) Also cleaned and oiled the air filter. Full tank of ethanol free 94 octane. And washed the bike.

Bike mods: PU kit, lab removed, Arrows + ecu

Mike (the guy with the earmuffs) said he was surprised as well with the numbers. We both expected 50+HP. It's running a little rich at the higher rpms. The jiggly lines are from the nubbies on the karoos. I asked if going to a single can would improve HP, but he said very little. Maybe more at higher rpms. He did say the bike runs smooth. Can't say I'm happy about the results. Might take it back to Mike and get a custom map. Dunno. I was going to change the pipes back to stock and dyno it, but after this result why bother.

 

[jtemple]

I am disappoint. 45 RWHP
I rode over to DaytonaMotorsports in Surrey,BC today where they had a dyno setup in the parking lot. Put in fresh oil and filter yesterday. (Maxima 5W-50 +Hi-flo) Also cleaned and oiled the air filter. Full tank of ethanol free 94 octane. And washed the bike.

Bike mods: PU kit, lab removed, Arrows + ecu

Mike (the guy with the earmuffs) said he was surprised as well with the numbers. We both expected 50+HP. It's running a little rich at the higher rpms. The jiggly lines are from the nubbies on the karoos. I asked if going to a single can would improve HP, but he said very little. Maybe more at higher rpms. He did say the bike runs smooth. Can't say I'm happy about the results. I'll talk to Bill at 5th Gear who's the local expert on Husky's. Might take it back to Mike and get a custom map. Dunno. I was going to change the pipes back to stock and dyno it, but after this result why

If it's fun to ride, who cares?

 

[oneleven]

If it's fun to ride, who cares?

+1 Don't get me wrong, I still love her to bits. Buuut, I was really hoping the numbers would match up with how it feels on road. Not to mention the $$$ spent!

 

[organ donor]

My dyno days are over (have spent a lot too much on various bikes over the years chasing the numbers). Right now, I just want the bike to feel right and be competitive. With the pu kit and the twin Arrows on the 630 ... I´m happy!

 

[jtemple]

+1 Don't get me wrong, I still love her to bits. Buuut, I was really hoping the numbers would match up with how it feels on road. Not to mention the $$$ spent!

Good point. Although I never understood the dyno numbers game. It seems so inconsistent to me. From what I understand, you could go do another dyno down the street and get a drastically different number. I bet ditching the knobbies for the run would make a difference as well.

The 630 has about 100hp less than the last two bikes I've owned; I don't miss the power one bit. This bike has truly made me love riding again.

 

[Fast1]

oneleven, how oily was the freshly cleaned and oiled air filter that you put in right before the test? In my experienes a freshly heavly oiled air filter has a significant impact on performance until the engine has been run enough at high rpms to pull the excess oil through the air filter and clear up the air way.

 

[oneleven]

much less than before the cleaning. I squeezed out as much of the excess as possible with lots of paper towels. Then gave the bike a good run until the smoke cleared. And another 30km on the highway to Daytona.