800CFI2 exhaust valve control
- Thread starter Danbot
- Start date
I've plugged the exhaust valve hose on all my sleds (2010-13), no issues at all. Just cut the hose back some, stuck a 1/4" bolt in the hose, hose clamped it, and enjoyed a clean engine bay for years with NO run-ability issues. Heck, dynotech Jim dynoed a CFi-4 motor with it plugged and got a more linear power curve. This is there Solely for EPA emissions. Basically like an egr system, keeping the exhaust pinched back longer to re burn any unused fuel again. But the valves need to open at a lower rpm to gain the free flowing exhaust port for peak hp. So plugging the hole just allows the system to do as it was originally designed.
me too!
I too was wondering about plugging the system. Anything to watch out for when doing this?
I too was wondering about plugging the system. Anything to watch out for when doing this?
Aren't you going to lose that "spike" when the valves open? It might be more linear but could be less of a jump in power.
I have tried to search for threads like this, but i cant find one other then this thread..
my '08 800 idles rougher when plugged. can't say i noticed much difference as far as performance either way. I think i'm going to take the plug out this year and see how things go.
i am interested in different spring/bellows setups though.
i am interested in different spring/bellows setups though.
good question, will try and search it now. but was wondering the same thing
In less time than it takes to research the threads, try this.
Simply bring a small pair of vise grips with you when you go out riding.
Pinch the 1/4" rubber hose between the "T" and the electric solenoid.
Take it for a test ride and make your own determination.
Due to variances in inconsistent fuel injectors, every sled varies.
Some need different exhaust springs to "fine tune" it, others don't.
Hope this helps
Idles differently at idle with hoses plugged??????
Come on now......................................................
Very good advice
as soon as my motor is back together I will give it a try, besides all the searches went to dragon motors, can't seem to find anything else onthe pro'si may not understand how they work and believe that it should not have an effect until valves open, but after i plugged them it just ran rougher at idle. could be unrelated or something else i did. regardless, i didn't feel the extra performance people rave about by plugging them. what i did feel was extra vibration and greater variance among my rpm during warm-up.
maybe i'll try a pair of vice grips and get quicker feedback from the machine.
All the exhaust valve solenoid does is keep the valves CLOSED until the ECU tells it to open by simply venting the cylinder pressure from the diaphragm and then when it wants to open the exhaust valve, it closes the solenoid valve and cylinder pressure builds, over coming the spring pressure. Plugging the vent of the solenoid should not effect the way it idles because the exhaust valve would be closed in either configuration... The ECU doesn't know any different if the vent is plugged or not, it just opens and closes the solenoid valve like its suppose to.
