Air box shelf mods

[snobyrd]

I see on bikeman s site their endorsing modding or removing the air box shelf for hp gains.
has anybody tried this and If so did you notice any positive or negative results.
There's 2 horns in there and appear to be removed by bikemen.

 

[HPJUNKIE]

I see on bikeman s site their endorsing modding or removing the air box shelf for hp gains.
has anybody tried this and If so did you notice any positive or negative results.
There's 2 horns in there and appear to be removed by bikemen.

I believe SLP recommends the same for their air intake.

 

[ak]

I'm pretty shure slp adds a air horn to the shelf, that's why they sell one.

For what it's worth I add the extra air horn to the shelf and added vforce reeds last year to my 600 and there was a noticeable gain.

Carls cycle is drilling extra holes in the shelf, there was someone on this forum who bought one of there sled and the shelf was removed all together.

 

[snobyrd]

Wats the purpose of the shelf and the horn?

 

[Wild_Canuck]

Interested... More info on this if possible, (what can be done DIY)

 

[Ken Climb]

I took my air horn/shelf out when I installed a slp cold air intake a month ago and it seemed to affect my idle. My sled now to idles a little low and i need to apply a little throttle to start my sled sometimes.
Nothing else seems to be affected, it has great off idle snap.
I'm not 100% that it was the shelf removal that did this maybe coincidence?...or something else??
Now if I wouldn't have butchered it and tossed it out !!

 

[TRS]

Air horns are a complicated item. Long narrow ones seem to give more torque on the bottom end and shorter wider ones seem to help top end.
The absence of them on a stock CFI2, IMO, cause some running issues that are remedied only when they are reinstalled. Is this caused by the TMAP sensor positioned out of the air path within a stock air box, I can't answer that.
Deep snow valves positioned below the shelf seem to have a similar negative effect.

 

[snobyrd]

Air horns are a complicated item. Long narrow ones seem to give more torque on the bottom end and shorter wider ones seem to help top end.
The absence of them on a stock CFI2, IMO, cause some running issues that are remedied only when they are reinstalled. Is this caused by the TMAP sensor positioned out of the air path within a stock air box, I can't answer that.
Deep snow valves positioned below the shelf seem to have a similar negative effect.

I you mentioned wat I noticed, bottom end loss with horns out, so do u figure i just install the horn with the extra holes being open or close the holes up as well?

 

[TRS]

I you mentioned wat I noticed, bottom end loss with horns out, so do u figure i just install the horn with the extra holes being open or close the holes up as well?

Put the horns back in and give it a try with the extra holes. You can always plug the holes later.

 

[OnlyPolaris]

I drilled extra holes in my air box shelf just like bikeman does. I did it first thing this year, so not sure if there was a noticeable gain or not against last year. All i know is the sled runs fine and no issues.

 

[Carlos Randolph]

I took mine out, and drilled the holes in the shelf. Little more snap in throttle response is all I really noticed. would say it was the same diff as going from an old belt to a new fresh one. That and it sounds different= LOUDER. The horns are In the airbox for noise a much as any thing else IMHO. X2 On the fine with no issues as well.