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Discussion Starter #1 (Edited)
Well I finally ran a test on the CVT airflow performance on my 2013 Maverick with stock clutches. I do not have the second air inlet on my machine. I have to apologize for taking so long to do this test (I've been saying I would do this since last year) and I haven't tested all the scenarios I planned yet either. I just haven't had the time to work and play with my Maverick like I thought I would.

So the first test is just baseline stock. I planned to also run a test with a 4 inch inline blower turned on and off. I also want to run the same tests with my QSC/STM setup but I don't think that is going to happen any time soon. Just not enough time right now. More than likely I will run those set of tests in the late fall.

So I used an anemometer to measure the air velocity coming out of the primary and secondary exhaust outlets. I measured the cross sectional area of each outlet and was able to calculate the volume of air (CFM) coming out of each outlet. I would estimate the tolerance for error to be no more than 2-5 CFM based on equipment accuracy, slight fluctuation in air flow during test runs and the cross sectional area calculation of each exhaust outlet. I will probably put these numbers in a excel graph later once I run the other 2 tests.

Baseline - Stock CVT

RPM -------- Primary Outlet CFM -------- Secondary Outlet CFM -------- Total CFM
1500(Idle) -------- 10.9 ------------------------- 10.9 ----------------------- 21.8
2000 -------------- 13.5 ------------------------- 14.5 ----------------------- 28.0
3000 -------------- 21.3 ------------------------- 25.3 ----------------------- 46.6
4000 -------------- 25.4 ------------------------- 48.6 ----------------------- 74.0
5000 -------------- 15.1 ------------------------- 93.5 ---------------------- 108.6
6000 -------------- 11.9 ------------------------ 128.7 ---------------------- 140.6
7000 --------------- 8.3 ------------------------ 155.0 ---------------------- 163.3

Stock CVT w/ 4 Inch Inline Blower Turned On

RPM -------- Primary Outlet CFM -------- Secondary Outlet CFM -------- Total CFM ----- % Increase
1500(Idle) -------- 25.4 ------------------------- 25.8 ----------------------- 51.2 ------------ 235%
2000 -------------- 27.0 ------------------------- 28.4 ----------------------- 55.4 ------------ 198%
3000 -------------- 28.6 ------------------------- 37.2 ----------------------- 65.8 ------------ 141%
4000 -------------- 30.1 ------------------------- 54.8 ----------------------- 84.9 ------------ 115%
5000 -------------- 19.7 ------------------------ 100.8 ---------------------- 120.5 ----------- 111%
6000 -------------- 17.9 ------------------------ 131.3 ---------------------- 149.2 ----------- 106%
7000 -------------- 15.0 ------------------------ 160.2 ---------------------- 175.2 ----------- 107%

Stock CVT w/ 4 Inch Inline Blower Turned Off

RPM -------- Primary Outlet CFM -------- Secondary Outlet CFM -------- Total CFM
1500(Idle) --
2000 --------
3000 --------
4000 --------
5000 --------
6000 --------
7000 --------

Disappointed in the results with blower on so not going to bother running the last test. I think it's clear you will lose airflow at high RPM over stock based on test with blower on.

2014-07-09 22_14_16-Maverick_CVT_CFM_Output_20140709.jpg
 

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thanks for the info.....very interesting to see how the primary outlet decreases above 4K RPM and the secondary outlet increases.....
 

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Discussion Starter #3
thanks for the info.....very interesting to see how the primary outlet decreases above 4K RPM and the secondary outlet increases.....
Yea when I saw that it dropped at 5000 RPMs, I didn't believe it so I ran the test again at 4000 and 5000 RPMs and the numbers were almost identical.
 

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are you planning on doing the 2nd air inlet mod at some point? It would be great to see the numbers after the mod.
 

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Discussion Starter #5
are you planning on doing the 2nd air inlet mod at some point? It would be great to see the numbers after the mod.
Yes, I am interested in knowing how well that recall mod works in comparison to the inline blower. I probably won't get to that until fall though as well. Will have to see how much free time I have this summer. That may be a more interesting test to run than my QSC/STM setup.
 

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would like to know what you see for CVT temps with the new blower as compared to previously. I am still on the fence about getting one. With my QSC/STM setup, I rarely see anything above 180' unless I am pushing it really hard for 5+ minutes or more. Typical temps are in the 160' range. I rode 2 days at St. Anthony's in the dunes and never saw temps above 180' either but the outside air temps were in the 70's. I have around 1000 miles and over 800 of them on my Gates C12 that I installed with my clutches. The belt still looks like new.....(knock on wood)
 

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Discussion Starter #7
Well I did notice that my belt temp gauge was reading in the 170-180 degree range when I was running at high RPMs. I ran 7000 RPMs for a good 2 min and the belt temp gauge didn't get over 180. When I stop the test and let the engine drop rpm my temp got down to the mid 160's then I turned my engine off. Right after that the temps climbed to the mid 180's so it seems the belt temps climb 20+ degrees when you turn the engine off immediately. I don't know how good that info is though because my wheels are free spinning in the air and not seeing true load conditions from the trails or sand.
 

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Discussion Starter #8
I will be using a Shurflo In-Line bilge blower I purchased from West Coast Marine. The model is Yellow Tail 277 series. It's a 6 blade fan and has a waterproof boot that covers the motor. Most bilge blowers are 5 blade fan. The specs show it is rated at 213 CFM at 13.6 volts but when I tested it with my anemometer, it measured 220 CFM at approximately 13 volts.

IMG_3483.JPG IMG_3484.JPG IMG_3485.JPG IMG_3486.JPG
 

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Sure would like to see some installation pics of this project. The where are you putting it and wiring ect. Thanks
 

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Discussion Starter #10
Sure would like to see some installation pics of this project. The where are you putting it and wiring ect. Thanks
No problem. I will post pics during the test. My intial wiring installation may be more test oriented (Quick and dirty) and not the final install but I will definitely do a final install how to. I suspect my final install will not have an on/off switch because I am thinking this blower will need to run all the time or I may use my Auber belt temp gauge with a built in relay to trigger the blower on at a certain temperature. Hard to say right now until I run the other 2 tests.
 

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Discussion Starter #11
I forgot to mention that I think I understand now why a 3 inch blower will not work well at high RPM on the Maverick. Some members have said that the inline blower hurts CVT airflow performance. I think pretty much all the 3 inch bilge blowers are rated at 115-135 CFM. From my baseline results at 6000 RPM and higher, the stock system is generating more airflow than the 3 inch bilge blower so the 3 inch bilge blower IMHO is actually negatively impacting the airflow or at least youre not getting any benefit from the 3 inch bilge blower at 6000 RPMs and higher. IMHO, the stock system is fighting with the 115-135CFM restriction at 6000 RPMs and higher.

I don't think this will be the case with a 4 inch blower because most 4 inch bilge blowers are rated at well over 200 CFM which is well above the CFM I measured at 7000 RPM but testing will confirm this.
 

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copy and pasted


Some more info. Thanks four4all for this info. not sure what machine this is off of but i think articcat. i would think they would all be similiar.

Ok here are the hard numbers:

Baseline - STOCK CVT NO BLOWER FAN IN LINE AT ALL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

RPM ----- CFM --- +/-%
IDLE ---- 0 ------- 100%
2000 ---- 53 ------ 100%
3000 ---- 82 ------ 100%
4000 ---- 100 ----- 100%
5000 ---- 163 ----- 100%
6000 ---- 227 ----- 100%
7000 ---- 237 ----- 100%

STOCK CVT WITH RULE 3" BLOWER MOUNTED ON INLET TUBE BUT WITH BLOWER OFF
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~

RPM ----- CFM --- +/-%
IDLE ---- 0 ------- 100% (blower fan not moving)
2000 ---- 53 ------ 100% (blower fan still not moving)
3000 ---- 77 ------ 94% (blower fan started moving)
4000 ---- 97 ------ 97%
5000 ---- 103 ----- 63%
6000 ---- 139 ----- 61%
7000 ---- 159 ----- 67%

STOCK CVT WITH RULE 3" BLOWER MOUNTED ON INLET TUBE BUT WITH BLOWER ON
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~

RPM ----- CFM --- +/-%
IDLE ---- 65 ------ ∞
2000 ---- 97 ------ 183%
3000 ---- 117 ----- 142%
4000 ---- 125 ----- 125%
5000 ---- 201 ----- 123%
6000 ---- 230 ----- 101%
7000 ---- 243 ----- 102%

Conclusions:

1) The in line mounted blower used to help cool the CVT should NEVER be left off
is is absolutely choking the airflow, so either run it anytime the machine is
running or do not bother installing it.

2) The 3" inline Rule blower never inhibits airflow at any point, but up higher
it is maxed out. The blower is rated at 135 cfm so now I would recommend at
least the 4" blower which is rated at 235 cfm. I think the 4" blower would make
a big impact probably achieving double airflow of stock at least up to 4000
maybe 5000 rpm and likely raising the airflow at 6000 and 7000 rpm as well.

3) I think the ultimate setup would be an inlet and outlet blower combined with
taking in air from a cool source.

4) If there were more bends in the inlet and outlet the added blower will show
more of an improvement than this test reflects because the stock CVT will be
flowing far less with more bends, so even the 3" blower would have a much more
pronounced impact.
 
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Discussion Starter #13 (Edited)
So here is how I plan to install the 4 inch fan. I think this is similar to the STM setup from the picture I saw on their website.

Basically, I removed the stock plastic duct above the steering column and replace it with the 4 inch fan, 4" to 3" coupler, a 3" flexible duct and a couple clamps. The stock flexible duct that the filter screen is located in has approximately the same circumference as the 4 inch fan and is flexible enough to go from a slot shape opening to a round opening. Worked out perfect.

The stock CVT duct system with my mod system.
IMG_3487.JPG

Stock flexible duct is flexible enough to change to a round shape and sized similar to the 4 inch fan.
IMG_3488.JPG

Stock plastic duct removed and replaced the mod parts.
IMG_3489.JPG

The 3" flexible duct is Spectre part number 8741.
IMG_3492.JPG

the 4" to 3" coupler is a Spectre part number 9761 .
IMG_3493.JPG
 

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stupid question here but the flex duct looks like it goes inside of the reducing coupler. So what does the hose clamp do on the 3" side????
 

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Discussion Starter #15
stupid question here but the flex duct looks like it goes inside of the reducing coupler. So what does the hose clamp do on the 3" side????
Yes, the 3 inch flex duct does go inside the coupler. I still clamp it to seal any air leaks. The coupler is very flexible so it should seal any possible leaks.
 

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what keeps it from popping out? does it screw into the coupler?
 

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ah...got it.....sorry for all of the questions.
 

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Discussion Starter #19
No problem. To be honest I don't like the flexible duct because it actually hurts airflow. Expanding and contracting slows down airflow but this is the only option I can use for now that will get the air from the fan to the CVT duct. The best option is a smooth molded duct like the stock duct.
 

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Here's how did my secondary filter setup. Mind you that the filter is dirty because I got input of pick n pull for $2.50. I took it off and cleaned it before final install.


Sent from my iPhone using Tapatalk
 
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