Sportsman 800 buildup...QSC...EHS... - Page 2 - Polaris ATV Forum
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post #11 of 22 (permalink) Old 03-15-2019, 01:07 PM Thread Starter
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Found this exhaust and has me curious. Since it has the tip pointed out the back Im wondering if it increases performamce at all. Straight through exit instead of the stock turn down.

https://www.ebay.com/itm/KIMPEX-Bolt...kAAOSwC8Zb4tnq
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post #12 of 22 (permalink) Old 03-15-2019, 04:13 PM Thread Starter
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Lil time tonight spent on the 800, nothing to serious.

First tried to remedy my vibration issues I have. Got some thermal foam strip with the adhesive backing. Put it all along the metal back support bracket so it was between it and the plastic rack. Worked pretty good and the vibration is about 80 percent gone. Still not sure the root of the vibration but this was a cheap and quick remedy to make it where its not such an annoyance. Also installed the new plastic rack and junked the scratched up old one.
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post #13 of 22 (permalink) Old 03-15-2019, 04:15 PM Thread Starter
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Also threw this one real quick. Only 50 bucks and will let it breathe more. Im counting on a 10 hp gain...😂😂😂
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post #14 of 22 (permalink) Old 04-03-2019, 05:57 AM Thread Starter
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QSC kit is in and only managed to ride up and down dirt road a bit so far. Initial impression is good increase in low end and so much smoother than stock. Love this kit.
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post #15 of 22 (permalink) Old 04-04-2019, 05:51 AM
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Also threw this one real quick. Only 50 bucks and will let it breathe more. Im counting on a 10 hp gain...😂😂😂
What little I know about horspower is it took a lot of work to sweeze 10-20 hp out of a V8 with just some add-on's, so expecting 10hp out of a motor that only has 40-50hp to start with is a stretch. I know in my drag racing days and that is before the typical fuel injection, computers and of course nitros. I used to try a bunch of the little tricks to eek out a few more horses. Yeah 60's-70's, it has all changed since. But then what do I know, thought I would add a couple of photos of my 1969 Boss 302?
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post #16 of 22 (permalink) Old 04-04-2019, 09:28 AM
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Also threw this one real quick. Only 50 bucks and will let it breathe more. Im counting on a 10 hp gain...😂😂😂
LOL, I hate to be the one to rain on your parade, but simply putting a vent in the air box lid will NOT give you a 10 hp increase. A free flowing exhaust and air intake combined MIGHT get you a 10% increase (4 hp) if your lucky.
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post #17 of 22 (permalink) Old 07-15-2019, 01:11 PM Thread Starter
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Wow I never seen these replies ...dug up this thread to update the quad ....about the 10 hp gain guys it was a joke. I know with my exhaust and airbox mods I'm only gaining probably 3 to 5 hp. I have a lil different configuration on it now and it runs great. Really 3 to 5 hp don't sound like much but the way the motor responds is very different. Throttle response is way improved and it's just way more fun to ride.
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post #18 of 22 (permalink) Old 07-15-2019, 01:34 PM
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Hey OP, If you're happy with it that's all that really matters anyway.
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post #19 of 22 (permalink) Old 07-15-2019, 02:36 PM
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And the vibration IIRC, how's that??

2011 Sportsman® 800 EFI
GURU front brush guard
GURU rear brush guard
Polaris front lock n ride cargo box
Polaris rear rack extender
Warn RT 3.0 winch w/amsteel synthetic line
Viper aluminum haus fairlead
Polaris front spring adjusters
Ricochet a-arm guards
Ricochet full frame skid plate
ITP T-7 beadlock 14" w/OMF inner rim guards
Maxxis big horn 2.0 26x9 front
Maxxis big horn 2.0 26x11 rear
QSC clutch kit
EPI HD springs front n rear
ODI rogue 130mm grips
Ultraseal commercial grade tire sealant (front)
Highlifter tire sealant (rear)
CTEK 3300 battery maintainer
added 7 zerks
beefed up wiring harness
OGIO rear bag
ROTOPAX 1gal. + 2gal. gasoline can
Jccapri bushing kit
Kolpin Over Fenders
Rigid Industries E-Series 10" flood
Walker Evans struts
NGK Iridium's (2,500 miles on Champion's and they looked great!)
Odyssey Extreme battery PC545

2018 Sportsman® 570-T
2019 Aluma® A8818
2020 Outlander® 1000R XXC (on order, ETA mid-Sept)
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post #20 of 22 (permalink) Old 07-16-2019, 03:48 AM Thread Starter
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And the vibration IIRC, how's that??
Vibration is gone. After a lot of adjusting its completly gone. Turns out the lower bolt head of the motor mount was hitting the inside of the headpipe and rubbing when the mitor heated up and the pipe expanded a little. Had to change up the isolator mount on the exhaust but shes good now. As for the performance mods none of them alone make a huge difference but all paired together make a nice difference in power but more importantly power delivery. Stock I felt this quad had a lazy feeling to it but now its really woke up. One thing I have learned is these 800s are rich from the factory for sure.
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