Zr7000 stock exhaust mod vs aftermarket - Page 3 - HCS Snowmobile Forums

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Old 03-26-2020, 12:40 AM   #21 (permalink)
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You recommend the excell? I would have to ship my stock one and I think its $150usd to get it modded but there is a local guy who has a trail can he wants $70 cad for.. just doing the math and if the noise volume is the same why not..
My SPI can makes a hit more power thru the mid range then the Excell modded stocker. They both are a improvement over stock though.

SPI is louder all around, especially at idle. The Excell modded is just a bit louder then stock. I do like the accessibility of the SPI though not to mention less underhood heat.

On big mileage trips I use the modded stocker for the quietness.
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Old 03-29-2020, 08:54 AM   #22 (permalink)
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@jminor1 Here is a dyno sheet of the 7000/viper motor showing the increases in HP with the different upgrades.

On my 2014 7000 I installed a air intake system, after market exhaust, and clutch kit and it definitely made a big difference. I would get 5+ sled lengths ahead in less than a 1000' of a stock 7000, before the upgrades we where dead even.

The four stroke motors like to breath.
Did you have to install a fuel controller for these mods??
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Old 03-29-2020, 07:36 PM   #23 (permalink)
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Current Sled(s): 2020 ZR 8000 LTD IACT
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Did you have to install a fuel controller for these mods??
No fuel controller needed.
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Old 03-30-2020, 07:50 AM   #24 (permalink)
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No fuel controller needed.
Thanks. I wonder why D&D say's you need a fuel controller with air box mods & there quiet muffler. I watched the Sandale video while dyno'ing and it starts to get lean around 7600 then goes back rich again around 8600. I dont know if they have a air box mod when they video'ed it. Maybe thats why they are saying 6-10HP gain.

Here is Sandale Stock muffler dyno pull video. No AFR though.

Here is there Maxflow Video with AFR.
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Old 03-30-2020, 12:35 PM   #25 (permalink)
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The air box is extremely restricted on those. Do an airbox mod also. You can do it for free if you watch the YouTube video. Stingrays yamaha viper air box mod. Also some clutching to get it to hold 9000 rpm and you will not get beat by that 1200.

Airbox mod, trail can and clutching for 8900 allowed me to walk away from my buddy's 1200!!!
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Old 03-30-2020, 04:14 PM   #26 (permalink)
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The air box is extremely restricted on those. Do an airbox mod also. You can do it for free if you watch the YouTube video. Stingrays yamaha viper air box mod. Also some clutching to get it to hold 9000 rpm and you will not get beat by that 1200.





Airbox mod, trail can and clutching for 8900 allowed me to walk away from my buddy's 1200!!!

What clutching you use??
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Old 03-30-2020, 08:06 PM   #27 (permalink)
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What clutching you use??
SSI adjustable with three magnets 1 weight in hole 1 and 2 weights in hole 2. Need a shallower helix to help back shift but other than that it pulls close to my 07 800 in mid range.
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Old 03-30-2020, 08:17 PM   #28 (permalink)
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With my SSI setup I was running 3-0-0 primary, 4th hole in SSI secondary and with the Pantera primary spring. Sled would pull around 8800 - 8900 couldn't get to the 9000 RPM's but that could have been due to the Pantera primary spring.

I'm not a clutch guy but I felt this SSI clutch kit setup seemed to work good for me, I'm not a racer just a trail rider. With my setup I would make a lot of 800's nervous up to 80 mph. The sleds I ride with do not run studs or my sled, just 1.25" stock tracks.

Last edited by Fun11cat; 03-30-2020 at 08:23 PM.
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Old Today, 04:04 PM   #29 (permalink)
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Airbox mod, trail can and clutching for 8900 allowed me to walk away from my buddy's 1200!!!

How much coin did it cost for the upgrades.
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