Air box mod ? - Yamaha FZ1 Forums - International FZ1 Motorcycle Community Forum

# two · 10-29-2009, 07:49 AM

What is the airbox mod? I already have the power commander, yosh slip on and bmc air filter. This winter i'm going to pull the header and look at drilling out the cat. I would also like to get more air in, but don't know what or where to modify the air box. thanks # two.

**Cobalt** · 10-29-2009, 08:08 AM

I don't have a picture of it but, under the air filter and in the shape of the air filter, you would cut the bottom out of the airbox below the air filter. You will see, under the filter, a snorkel of plastic. Your goal is to remove this out to the edges where the airbox sides go vertical toward the air filter.

The extreme method is re-routing cables, etc to clear the area underneath and through the frame to allow maximum air intake. I'll see if I can grab a pic and attach it here.

That was easy...

Found the original Lars pics, hence the nickname LARS Airbox Mod.

**Cobalt** · 10-29-2009, 08:14 AM

Since this seems to be the only thread with pics on the subject after a search here, I'm making this a sticky for the GEN II mods page.

Special thanks to Lars over at FZ1OA for the borrowed phtotos! (Gotta give credit where credit is due!)

**NJFZ1** · 10-29-2009, 10:09 AM

Just to add to this. On the bottom picture it's ok to cut that piece that is sticking up at the front of the airbox. In other words you can just cut it straight across. There is no point in leaving it there and I believe that in a later thread Lars went back and cut it off. I cut it off when I did mine as well.

**Cobalt** · 10-29-2009, 10:21 AM

Quote:

Originally Posted by NJFZ1

Just to add to this. On the bottom picture it's ok to cut that piece that is sticking up at the front of the airbox. In other words you can just cut it straight across. There is no point in leaving it there and I believe that in a later thread Lars went back and cut it off. I cut it off when I did mine as well.

Now I have to go look at mine.... not sure if I cut that off or not! Thanks!!!

**Polestar** · 11-16-2009, 09:31 PM

What benefits do you find with this mod and why didn't (or did) Yamaha engineers design the air box as they did? I put in a K&N High Flow filter recently and think I have improved low end torque?

**NJFZ1** · 11-17-2009, 06:06 AM

Quote:

Originally Posted by Polestar

What benefits do you find with this mod and why didn't (or did) Yamaha engineers design the air box as they did? I put in a K&N High Flow filter recently and think I have improved low end torque?

I can't tell you why Yamaha engineers designed the airbox as they did, but in theory the stock opening is large enough to support the horsepower of the engine. The problem is that the design of the airbox forces the air to make a sharp turn. Seems that opening the airbox up lets the engine breath a lot better. Will be of most benefit once you do exhaust mods as well since more air in equals more air out.

**Cobalt** · 11-17-2009, 10:12 AM

Here is a wiki on why airboxes are designed the way they are: Helmholtz resonance - Wikipedia, the free encyclopedia

**Hail** · 11-17-2009, 02:26 PM

Well dang! Now I feel like I did something wrong.

JRL · 12-06-2009, 12:48 PM

I have an 08 FZ1 with a K+N / acraprovic end can / PCIII + Dyno run / remap completed with a RWHP = 146.
Looking at the tread is looks like the Max HP I could gain from an Air Box mod + Cat gutting and Flies Mod would be 6 Hp at most would this be correct. If I did the above mods I presume I would need a remap again .. Newbie so just asking a question..

10-29-2009, 07:49 AM	#1 (permalink)
# two Senior Member Bike: '07 FZ1, '83 YZ490, '71 suzuki T250, '06 roketa RDS 125X Join Date: Apr 2009 Location: michigan, USA Posts: 148 Thanks: 33 Thanked 53 Times in 31 Posts Feedback Score: 0 reviews	Air box mod ? What is the airbox mod? I already have the power commander, yosh slip on and bmc air filter. This winter i'm going to pull the header and look at drilling out the cat. I would also like to get more air in, but don't know what or where to modify the air box. thanks # two.

10-29-2009, 08:14 AM	#3 (permalink)
Cobalt Adminstrator Bike: 2009 Cobalt Blue FZ1 Join Date: Jun 2009 Location: 43.221518, -70.894099 Posts: 7,016 Thanks: 5,099 Thanked 3,373 Times in 2,032 Posts Blog Entries: 10 Feedback Score: 2 reviews	Since this seems to be the only thread with pics on the subject after a search here, I'm making this a sticky for the GEN II mods page. Special thanks to Lars over at FZ1OA for the borrowed phtotos! (Gotta give credit where credit is due!) __________________ ..........

10-29-2009, 10:09 AM	#4 (permalink)
NJFZ1 Moderator Bike: 2006 FZ1, 1997 YZF1000 Join Date: May 2009 Location: Northern NJ Posts: 6,632 Thanks: 1,563 Thanked 2,459 Times in 1,798 Posts Feedback Score: 5 reviews	Just to add to this. On the bottom picture it's ok to cut that piece that is sticking up at the front of the airbox. In other words you can just cut it straight across. There is no point in leaving it there and I believe that in a later thread Lars went back and cut it off. I cut it off when I did mine as well. Last edited by NJFZ1; 10-29-2009 at 10:12 AM.

11-16-2009, 09:31 PM	#6 (permalink)
Polestar Senior Member Bike: 2008 Granite Gray FZ1 Join Date: May 2009 Location: Spanaway, WA Posts: 502 Thanks: 303 Thanked 125 Times in 90 Posts Feedback Score: 0 reviews	What benefits do you find with this mod and why didn't (or did) Yamaha engineers design the air box as they did? I put in a K&N High Flow filter recently and think I have improved low end torque? __________________ "Forbear to be excited by praise or offended by criticism; and don't be too eager to give praise or criticism." Reuben Obermeister 2008 Granite Grey MODS: K&N Air Filter/ Power Commander V/ Corbin Front Saddle/ Graves standard sliders/ JW's Radiator Guard/ Satan's Hwy Pegs/ FZ6 Footrest Covers/ Puig Touring Windscreen-Smoke/ TechSpec Gripster Tank Grip/ G2 Throttle Tamer/ Yamaha Chin Spoiler My Cage: '99 Merc C280 Sport Last edited by Polestar; 11-16-2009 at 09:35 PM.

11-17-2009, 10:12 AM	#8 (permalink)
Cobalt Adminstrator Bike: 2009 Cobalt Blue FZ1 Join Date: Jun 2009 Location: 43.221518, -70.894099 Posts: 7,016 Thanks: 5,099 Thanked 3,373 Times in 2,032 Posts Blog Entries: 10 Feedback Score: 2 reviews	Here is a wiki on why airboxes are designed the way they are: Helmholtz resonance - Wikipedia, the free encyclopedia __________________ ..........

11-17-2009, 02:26 PM	#9 (permalink)
Hail Moderator Bike: 2K9 Yamaha FZ1 Join Date: Aug 2009 Location: Houston, TX Posts: 3,398 Thanks: 1,678 Thanked 1,421 Times in 952 Posts Feedback Score: 5 reviews	Well dang! Now I feel like I did something wrong. __________________ PCV \| BMC Filter \| CD Sub-Throttle Plates \| Air-box Mod \| Graves AIS Block Off \| Yosh TRC Slip-on SS Braided Brake Lines \| Watsen LEDs \| CD Strike Seat Cowl \| Pazzo Levers \| D3 Grips \| Graves FE Graves Frame Sliders \| Rad-Armor Guard \| ZG SR DS Wind Screen \| Integrated Tail Lights

12-06-2009, 12:48 PM	#10 (permalink)
JRL Junior Member Bike: FZ1 Gen2 08 Join Date: Dec 2009 Location: UK Posts: 1 Thanks: 1 Thanked 0 Times in 0 Posts Feedback Score: 0 reviews	Air Box Mod HP Gains ? I have an 08 FZ1 with a K+N / acraprovic end can / PCIII + Dyno run / remap completed with a RWHP = 146. Looking at the tread is looks like the Max HP I could gain from an Air Box mod + Cat gutting and Flies Mod would be 6 Hp at most would this be correct. If I did the above mods I presume I would need a remap again .. Newbie so just asking a question..

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