Airbox/Intake Questions

1315 Views 12 Replies 4 Participants Last post by miller, Sep 24, 2008

Jimmy Hart

Discussion Starter · Sep 24, 2008

so maybe i was a bit dramatic with the topic description...

here is my issue...

I am looking at improving the airflow to my bike and i have considered various options and am looking for the best decision... the options i've considered so far are the following:

1. Simply install a Uni and run without a box lid or modify mine(probably wouldn't be too good at this)
2. Get the EHS box lid and add a Uni
3. Get an aluminum airbox
4. Intake system(Pro Flow, etc.)

I do a lot of mixed riding and i'm not real crazy about the idea of running no lid... so far i'm leaning most heavily towards the EHS lid... what you do fellas reccommend?

Thanks!

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miller

· #2 · Sep 24, 2008

On the trails I run an 04/05 stock intake box with the lid off and the UNI is my favorite filter. This setup when oiled properly will be fine, even in mud, but must be cleaned right after.
In cleaner areas i run a heavily modified ESR intake that has been sculpted on the inside with epoxy and shaped like a venturi near the end where it opens into the boot and carb bell. When Gary my flow guy hooked up my head/boot /carb and modified ESR intake to a flowbench, it lost 1 cfm over having NO intake on the carb bell at all, ( well noss adaptor on the carb as in my sig pic below) he thought this was very good.

A stock o4/05 tube with a dasa ring and huge Kand N style filter in the same test lost 4 cfm under the same conditions. This does not really mean either one will make more power, but it lets me know that my ESR flows good enough and Id like to think it makes more power if I tested them next on the dyno.

Its kinda nice having a guy with a flowbench who can test things like this. although results dont always translate directly into power.. :_specialED:

Im not crazy about lids of any type, jmo

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pgreenlaw

· #3 · Sep 24, 2008

What year bike? The reason I ask is the 06+ had a lot better filter design and just removing the air box lid and using a stock filter or a UNI filter is a great performance upgrade. (when matched with a better flowing exhaust and having the carb jetted correctly.)

A full intake system will be more expensive, but it will look better and probably warrant 1-1.5 horsepower(depending on engine setup) over an open airbox system. (again, when tuned correctly)

If you are not real crazy about running with an open lid, you may want to ditch the idea of an air box eliminator ("intake system") setup. Most aftermarket intake systems make you get rid of the air box completely and that exposes the filter to more areas that can get dirty and usually requires more frequent cleaning than an open air box design.

Both systems have their pros and cons. Neither will harm your engine if you commit to cleaning and oiling them regularly. Most importantly, though. whenever making modifications to your intake and exhaust, get your carb jetted. If you cant get it onto a dyno with an A/F reader, let us know your mods and we can help you get it safe. A dyno is your best bet and will ensure that you are running your quad to it's full potential and most importantly, safe for your engine.

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miller

· #4 · Sep 24, 2008

so maybe i was a bit dramatic with the topic description...

here is my issue...

I am looking at improving the airflow to my bike and i have considered various options and am looking for the best decision... the options i've considered so far are the following:

1. Simply install a Uni and run without a box lid or modify mine(probably wouldn't be too good at this)
2. Get the EHS box lid and add a Uni
3. Get an aluminum airbox
4. Intake system(Pro Flow, etc.)

I do a lot of mixed riding and i'm not real crazy about the idea of running no lid... so far i'm leaning most heavily towards the EHS lid... what you do fellas reccommend?

Thanks![/b]

I also vote no on the aluminum airbox..wont help much at all IMO spend the cash elsewhere

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Jimmy Hart

Discussion Starter · #5 · Sep 24, 2008

Thanks guys...

I've got an '07 and i just ordered a HMF Sport exhaust system, Hotcams Stage 2 and I'm going to change the jetting(obviously)

The fully exposed intake is definitely out and I understand that with any kind of box mod i'll have to stay on top of cleaning the filter, but i feel better having the EHS lid after reading a few reviews... it ish pretty expensive though

Miller, why don't you like lids? just a waste?

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miller

· #6 · Sep 24, 2008

what condition do you ride in most? trails? desert? groomed tracks? In my environment no lid is just fine and provides great flow, the UNI has two layers and keeps dirt away very well is my excuse..but fine silt may be another story. There is an old trick to cover the top of the box with a pair of pantyhose thats works well also. lol

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Jimmy Hart

Discussion Starter · #7 · Sep 24, 2008

what condition do you ride in most? trails? desert? groomed tracks? In my environment no lid is just fine and provides great flow, the UNI has two layers and keeps dirt away very well is my excuse..but fine silt may be another story. There is an old trick to cover the top of the box with a pair of pantyhose thats works well also. lol[/b]

lol at the panty hose

I do probably more woods riding than anything, but I also do a lot of wide open field riding... i plan on going to some tracks once i can find one around here worth a damn...

as long as i'm staying relatively dry and out of the mud i should be fine correct? i may just order the EHS lid and swap between that and the stock lid depending on conditions

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miller

· #8 · Sep 24, 2008

IMO going from no lid/ ehs lid to a closed lid will require rejetting for sure, but im sure you knew that, it may be a pain

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Jimmy Hart

Discussion Starter · #9 · Sep 24, 2008

How sloppy can i let conditions get for a ride if i do the EHS/no lid route and clean immediately after? I'm fine with keeping it clean, i'm just scared of doing any harm during the actual ride

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miller

· #10 · Sep 24, 2008

im not sure if I can answer that, Id get the ehs lid if you really want it.

I have had the top of my uni caked in mud, and the inside will be nice and clean..but that was me, Id protect your investment the way you want to for sure...

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Jimmy Hart

Discussion Starter · #11 · Sep 24, 2008

Thanks for the help, i think i'm going to go ahead and order the EHS and Uni

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sandshots

· #12 · Sep 24, 2008

On the trails I run an 04/05 stock intake box with the lid off and the UNI is my favorite filter. This setup when oiled properly will be fine, even in mud, but must be cleaned right after.
In cleaner areas i run a heavily modified ESR intake that has been sculpted on the inside with epoxy and shaped like a venturi near the end where it opens into the boot and carb bell. When Gary my flow guy hooked up my head/boot /carb and modified ESR intake to a flowbench, it lost 1 cfm over having NO intake on the carb bell at all, ( well noss adaptor on the carb as in my sig pic below) he thought this was very good.

A stock o4/05 tube with a dasa ring and huge Kand N style filter in the same test lost 4 cfm under the same conditions. This does not really mean either one will make more power, but it lets me know that my ESR flows good enough and Id like to think it makes more power if I tested them next on the dyno.

Its kinda nice having a guy with a flowbench who can test things like this. although results dont always translate directly into power.. :_specialED:

Im not crazy about lids of any type, jmo[/b]

got any pix of your modded esr?

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miller

· #13 · Sep 24, 2008

i sure dont... i kinda thought it looked goofy, the entire inside of everything was coated with JB weld..i used jb weld about 3 different times, (16oz tube and still have plenty left) and sanded in between. The entire transition is gone. And it gently curves out like a bell to the point that it meets the rubber boot.... Ill have to get some pic later.

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