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OMG! Airbox fan

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Nah, I'm pretty sure that's static.

Which probably means that 1psi is where the blades stall.... it will probably remain pretty consistent through the RPM range.

Gotta admit, that's one way around having to design in a wastegate or other pressure regulating devices :thumbsup:

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He just got into contact with Kelstr last week, and Kelstr is incredibly busy... this isn't his first priority.

As far as Scooter, he doesn't OWN a dyno. That dyno run above for my truck was scheduled over a month in advance.

A month in advance for a dyno run??? Are they rare over there? Every garage here in Aust has one sitting in the corner!

Anyway, I don't think this is fan thing is anyone's first priority! :thumbsup:

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Hmm... there's an idea :thumbsup:

Nahh... if the fan is capable of putting out 220cfm as claimed, then it is actually capable of flowing more thant double what the YZ450 will demand at 13,000, so theoretically, it COULD work, producing more than 15psi of boost.

The problem is that these fan blades are far different from turbo fan blades and will stall at a much lower pressure differential. Once the blades stall, it's like a boat's prop cavitating.... the fan becomes a solid disk blocking nearly all airflow.

And of course, the other problem of the bowl vents being outside of the airbox.

Yeah, you do know what kind of RPM's a turbo spools up to, don't you????

Not to mention the power required to spool the thing up in the first place!

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ReallY? I have a Volvo in my driveway that disagrees with you. And you've never seen a Buick grand National or a Celica Supra twin turbo run, have you? Blowers, superchargers, turbochargers, it's all about force feeding air to an engine as a matter of fact. The problem here is that this device is not capable of doing that by the designers own admission (where he mentioned the fact that the fan is only capable of producing 1 psi of pressure).

i have a Volvo in my driveway that disagress with me too. i was being sarcastic :thumbsup:

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Dyno's aren't exactly rare, but they aren't really common either... there aren't THAT many garages.

Add to that the demand (every ricer wants a session every time he gets an extra $100), and it can be tough.

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I'm gonna hafta agree with everyone else on this thread and call that it doesn't do anything. Having said that, would it be possible to place a couple smaller fans (maybe 2-3") behind the air filter instead of in front of it? This way, the fans wouldn't obstruct airflow. Ya think it would give any power gains?

YOU BE JUST AS BETTER OFF CUTTING HOLES IN YOUR AIR BOX AND RICHENING YOUR FUEL MIXTURE.

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I'm gonna double my horsepower and get two!

INSTALL ONE BACKWARDS ON THE EXHAUST TOO, THEN IT WILL IMPROVE FLOW THERE AS WELL!

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TURN YOUR CAPS LOCK OFF!

no kidding.

anyway, does anybody even have experience with this thing? was the one on ebay the only one ever made? :thumbsup:

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Dude, you suck at the Internet, and you post without thinking.

If you actually had read the entire thread, you wouldn't be asking that question.

You are the reason I was happy when they split the WR/YZ forums.

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Dude, you suck at the Internet, and you post without thinking.

If you actually had read the entire thread, you wouldn't be asking that question.

You are the reason I was happy when they split the WR/YZ forums.

Come on man, that's harsh.

Anyway, what's the best pipe for my bike? :thumbsup::thumbsup::confused::bonk:

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Seriously, you guys should calm down about the capslock thing, there's way WORSE things to get agitated about. :thumbsup: As I have posted on other threads that had capslock-haters, I have to leave capslock on when using my work computer in order for the program we run to work properly. You'll be happy to know I'm home now and was able to post something without it being capitalized! And yz250ftony, sorry I hadn't gotten to page 15 or whatever page you posted on yet, if you haven't noticed this is a very long thread. Now I'm up to speed and I'll never ever repost something you said ever again. :thumbsup:

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well we all have been waiting for this fan to be tested , Scott the engineer and producer of this product has got a working kit all sorted out and he sent me a kit to install it on a new stock yz250f and give some feed back to what was found.

the bike that was used was a new 07 yz250f that had no time on it at all ,

it still had the titty's on the tires and the chain had not been adjusted yet, and it is all stock -----everthing stock .

i first got used to the bike stock , i put in a 30 min moto on the Motoland track in Casa Grande AZ,

the yami was great ---the kyb stuff works good as deleiverd, the clutch and chassis are also top knotch , i was able to go out and rip very hard on this bike in a lap or so --. ( i do like the yz 250 f yami anyway and have spen alot of time on them and they are really fun and easy to ride----the new tires from bridgstone are really cool on this bike , also a bonus ! )

then i came in and proceded to install the kit ,------Scott has now made the kit where you use a different stator for the extra a/c power to run the very cool high out fan ( way better than trying to use a battery pack :thumbsup: )

he also uses a rectifier to wack the a/c wave in half to only use the dc side of it to run the dc fan ----real normal stuff !

so you pull the flywheel with a puller that is supplied in the kit , install the stator , re-install the wheel and you are done there .

then you remove the air filter, and the air filter holder in the box , then you pop the fan assembly in the box and tighten up the band and you get a shorter air filter bolt and cadge and you install your factory air filter .

it all fits very nice , clean , and professional looking .

then you install a different pilot jet, leak jet, and a pump diafram -----all included in the kit-----.

then i fired the bike up , warmed it up again ( it took me 1 1/2 hrs to install the kit for the first time----after now i have done it i can do it in 1 hr )

on the track the bike had a different exhaust sound ( deeper ), the bike would come up on the power quicker with less clutch work , and it had more mid -----and really had more on top , ------the fan spins harder with more rpm , kinda cool when using the bike electrical system ----the more rpm the more current , so the faster the fan spins .

the fan will spin 5,000 rpm at top current of 2.5 amps.

the thing works better than i though it would , it felt like a big motor in the mid ----but it would still spin to the moon and made good overrev because you are still using a nice light stock size piston !

there are several really big long jumps right out of corners that were really hard to make on the stock bike ,-----with the fan installed the bike could easily carry 4th gear and clear them -----as when stock the bike had to stay in 3rd and you had one hell of a time getting the ft wheel over .

i have to say the thing is real , and it does help power no doubt.

i really feel that with a pipe, and a modded motor the thing would really work well there also .

i took and put the bike back to stock ( except i left the stator in )--and then i ran it again to see if i could tell if the stator would pull the motor down at all ,---( there was no difference from stock stator to mod stator )

the bike ran just the same stock ( it was easy to tell when you took it off and then road the thing that it was back to being week in the mid and top again .)

it took along time to get this test going , but i feel like Scott has really put a huge effort in getting the kit streemlined and doing away with the battery pack .

this alone is worth the weight.

i asked him to make one for my crf250 honda , and he said he is trying but the honda air box is so screwed up that it will be a nightmare to come up with a set up for it -----the yami is just such a nice designed box and the system really fits nice :thumbsup:

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