VES celenoid - what does it do? - Page 3 - HCS Snowmobile Forums

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Old 02-02-2011, 04:56 PM   #21 (permalink)
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Wow, didn't mean to start a pissing contest lol!

Just never understood the purpose of the solenoid. It being used to regulate the map when the valves open makes sense.

Ha, I want a carb sled again!
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Old 02-02-2011, 05:59 PM   #22 (permalink)
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That may be interesting, but you may need a stiffer spring to get the best results. From my tinkering on VES to get better MPG's, when valves open sooner, carb calibration is tough because the throttle is open more at the same speed and RPM because starts lugging more. As for heat on VES valves, too rich midrange jetting is harder on valves than it is to have them opening later. I've had EGT read as high as 1,400 deg with OEM carb setting and get 10 MPG, then leaned down mid range and dropped EGT to 1,200 with at least 3 MPG better. That is cruising at 40 to 50 MPH, around 1/4 throttle and 6,000 or less RPM's. With the valves open sooner, you can't tune the carb right most of the time, IMHO. God knows what it's doing on CFI set up opening sooner at part throttle. For comparison, my 800 edge got around 10 MPG new with oem settings, now it's getting 15 to 18 MPG most of the time. It's not all in the valves, or the jetting, it's a combination of all the above. Now if we can get my son's IQ to come around, maybe he can afford to drive the hog, 10 MPG sux, opps already said that...
My edge and my fusion have the same pink spring in them, so it would be as close to an apples to apples comparison as one could get i would think. The only variable that would be changed would be the solenoid losing control of the valve opening point. It costs nothing, so i'll probably try it out this weekend.
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Old 02-03-2011, 10:16 AM   #23 (permalink)
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"Says the guy with 20 posts "

Yes, says me the guy with 20 posts who works on fuel injection systems for a living, and makes fuel injection maps for a living, builds motors for a living, does porting for a living, builds custom rods and stroker cranks for a living, and spends countless hours on a dyno. I hate to see people get crap advice to get ill performance and wreck their motors and ruin their winters from someone who does not know what they are talking about. I think I'm qualified to give some advice. My only goal here is to help some people get their best performance from their motors and keep them from melting down their cylinders. Sorry I only have 20 posts I'm not a keyboard rider.
This Guy knows his shit I ride with him every week and is the best at what he does and a very good fast rider. Read up on cannondale quads ,he and product is the only product that kept these quads alive and running. And still has the highest dynoed horsepower 500cc quad running factory cases and cylinder and head.

But as far as plugging the valves. Stick on some egts and try it.
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Old 02-03-2011, 10:22 AM   #24 (permalink)
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I'm still trying to figure out what a "celenoid" is..
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Old 03-06-2011, 05:40 PM   #25 (permalink)
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I have a 2011 iqr 600. Rpm's at wot have varyied lately so after some test runs on the lake I disconnected and plugged the lines from the exhaust valves.I now run 300 rpm's more at wot every time. Very noticeable performance gain at 7200 up to 8300 Problem now is 6000 to 7200 rpm's became less responsive which tells me the valves are opening to soon but aparently not consistantly opening all the way with solenoids connected. Would I be correct that this means my solenoids are faulty or the power to them is not always there? My thoughts are to increase the spring pressure and leave the stupid solenoids on the work bench. Any body seen this before.
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Old 03-06-2011, 06:35 PM   #26 (permalink)
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I have a 2011 iqr 600. Rpm's at wot have varyied lately so after some test runs on the lake I disconnected and plugged the lines from the exhaust valves.I now run 300 rpm's more at wot every time. Very noticeable performance gain at 7200 up to 8300 Problem now is 6000 to 7200 rpm's became less responsive which tells me the valves are opening to soon but aparently not consistantly opening all the way with solenoids connected. Would I be correct that this means my solenoids are faulty or the power to them is not always there? My thoughts are to increase the spring pressure and leave the stupid solenoids on the work bench. Any body seen this before.
Sounds to me like you're on the right track. I'd go through everything I could, and if it all checks OK, I wouldn't want to mess with it any further. Trying to figure out if/when the solonoids are getting their signal is someplace I'd rather not go. That's me though? You'll end up dinking with it enough to figure out what spring works, then you're golden.....

The carbed 600 HO engines open at 6000. Any porting or exhaust mods will change what you have going on. I can give you that much.
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Old 03-06-2011, 07:11 PM   #27 (permalink)
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Interesting about the 6000. Thought it would be higher from what I'm seeing on the tach and feeling in the throttle but then again port timing on the two of them I would guess is different also. I'm going to round up some springs from an old style valve system ( 05 600 and 800 used green/yellow) and see how it feels. The sled runs so much better on top from 7200 to 8300 that I don't trust the solenoids inconsistant performance. Springs are cheap solenoids and cdi's or whatever powers them is not.
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Old 03-06-2011, 07:42 PM   #28 (permalink)
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According to my 07 Poo service manual is says on CFI sleds the solenoid closing will vary with throttle, rpm, and pipe sensor readings. On carb motors the solenoid will close at 6700 rpm when throttle is at least 3/4 open and at 7200 when throttle is at least 1/2 open.
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Old 03-06-2011, 08:09 PM   #29 (permalink)
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The higher rpm opening makes sense from what I'm feeling on the sled. Iqr has no throttle position sensor so the ecu must get a signal from the stator at "6700" ( I've read) that tells the solenoids to close. It also has a softer spring than old style valve because it just needs to push the valve down with pressure released by solenoid it takes less force. Definately going with a stiffer spring .Thanks for info guys.
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