MOUNTAIN VMAX4
Pro
I did an exhaust mod and would like opinions on it. I wanted an extreme weight savings and more power. I removed the stock exhaust from the middle of the crossover pipe back and welded a 2.5in straight pipe (yes its loud) turned out in to tunnel. I ended up after I built a rack to support the rear of the seat, and a cover for the hole in the tunnel to have removed 24 lbs bringing my to 64.5 lbs off so far.
My question is do you think I need to worry about back pressure or anything?
I dont have a A/F guage yet and was wondering if any of you think I should have to rejet? 1 or 2 sizes up?
Seems to rip pretty good, I think it pulls harder I did the 151x16 mod at same time seems to pull harder even spinning that bigger track.
My question is do you think I need to worry about back pressure or anything?
I dont have a A/F guage yet and was wondering if any of you think I should have to rejet? 1 or 2 sizes up?
Seems to rip pretty good, I think it pulls harder I did the 151x16 mod at same time seems to pull harder even spinning that bigger track.
Frostbite
TY 4 Stroke God
Welcome!
I found my sled seemed to pull harder throughout the powerband too with the single pipe. I have ECP filters but I didn't change a thing with my jetting and it works just great. I thought I was going to have to change my jetting too but, I did not. My idle is now the smoothest it has ever been, the burbles I used to have when letting off the throttle are gone and the midrange pulled wicked hard!
I do have a Holtzman ATACC on my sled though so it may have helped out a bit?
The only thing I noticed the last time I was out was the sled seems to pull harder now at 3/4 throttle than it does mashed to the bar. Maybe I'm pulling too many RPM now (10,600ish)
Give it a try again, check your plugs and if they look good. Just drive it!
Good luck
Frosty
I found my sled seemed to pull harder throughout the powerband too with the single pipe. I have ECP filters but I didn't change a thing with my jetting and it works just great. I thought I was going to have to change my jetting too but, I did not. My idle is now the smoothest it has ever been, the burbles I used to have when letting off the throttle are gone and the midrange pulled wicked hard!
I do have a Holtzman ATACC on my sled though so it may have helped out a bit?
The only thing I noticed the last time I was out was the sled seems to pull harder now at 3/4 throttle than it does mashed to the bar. Maybe I'm pulling too many RPM now (10,600ish)
Give it a try again, check your plugs and if they look good. Just drive it!
Good luck
Frosty
MOUNTAIN VMAX4
Pro
Frostbite
I will check em next ride. And if they are fine I will probably leave em. I do not even have a muffler just straight 2.5 pipe sounds wicked. I am wondering is the ECP kit a drastic amazing improvement over stock what gains are there and where I have been considering this for awhile and for only about $200 sounds like a great mod. Thanks, Justin
I will check em next ride. And if they are fine I will probably leave em. I do not even have a muffler just straight 2.5 pipe sounds wicked. I am wondering is the ECP kit a drastic amazing improvement over stock what gains are there and where I have been considering this for awhile and for only about $200 sounds like a great mod. Thanks, Justin
Frostbite
TY 4 Stroke God
The ECP kit has worked very well for me.
If you are going to get it, buy the filters, over filters, velocity rings, proper jets and the proper Holtzman carb spring for your elevation at one time.
Look under the air intake page and you'll see the ECP filter kit adds something on the order of 28 hp and a whol elot of torque through the midrange. That's something even your uncalibrated butt-ometer will feel.
Frosty
If you are going to get it, buy the filters, over filters, velocity rings, proper jets and the proper Holtzman carb spring for your elevation at one time.
Look under the air intake page and you'll see the ECP filter kit adds something on the order of 28 hp and a whol elot of torque through the midrange. That's something even your uncalibrated butt-ometer will feel.
Frosty
powder muncher
TY 4 Stroke Junkie
Hi Frosty
Not trying to be a bumer but we found the ecp kit didn't do much at all , the gain came from the clutching ( I did that first) and the Intake kit was more for show and tell, I did go back to the stock air box for more consistent running at different temps and elevation.I found the best throttle response by cutting the original springs down , that worked better than the after-market springs.I have to say that was before the velocity rings. ECP had huge problems back then anyway.
I had a 2'' single pipe slightly opened air-box (internals only) jeted one size down this would out-pull the Apex any day and be right with the king cat highmarking and just woop it on a straight pull. I can find the clutching specs if you want.
Got the turbo now
Not trying to be a bumer but we found the ecp kit didn't do much at all , the gain came from the clutching ( I did that first) and the Intake kit was more for show and tell, I did go back to the stock air box for more consistent running at different temps and elevation.I found the best throttle response by cutting the original springs down , that worked better than the after-market springs.I have to say that was before the velocity rings. ECP had huge problems back then anyway.
I had a 2'' single pipe slightly opened air-box (internals only) jeted one size down this would out-pull the Apex any day and be right with the king cat highmarking and just woop it on a straight pull. I can find the clutching specs if you want.
Got the turbo now
Mountain vmax 4 please fill out your profile location, it's required by all members.Thank You
MOUNTAIN VMAX4
Pro
clutching
Powder Muncher,
I am running the Heel Clickers and the clutching is working pretty well hits hard pulls hard pulls rpm.
But I would be curious what you are running and would be open to try some other set ups.
Pro116 moderator,
Sorry thought I had put my Location. Will get right on that.
Powder Muncher,
I am running the Heel Clickers and the clutching is working pretty well hits hard pulls hard pulls rpm.
But I would be curious what you are running and would be open to try some other set ups.
Pro116 moderator,
Sorry thought I had put my Location. Will get right on that.
powder muncher
TY 4 Stroke Junkie
I have a turbo on now with 65 grams on the Heel - Klichers 14.5 mm rollers with blue pink blue spring and team secondary .
I used to run Viper weights loaded with long solid rivets to the max and a short Green Pink Green spring team roller with a 58-38-46 helix and like I said cut stock carb springs and the air-box slightly opened up internally only, with a 2'' titanium single pipe. At that point the sled did weigh in at 540 pounds dry. It would take any stock sled by at least 1 to 2 sled length right of the line (snow drags) engagement was quite low but 0 track-spin just all go.
I kinda miss this set-up as it was just right there with the 800-900 cc 2 strokes and we all had a ton of fun. Now with the turbo there is no more competition I watch the guys dig around a hillside for a while and than just drive straight up the middle and over the top no challenge and they all get bummed out.
If I go out with other turbos or the crazy mountain nos gang we get into such stupid places that it gets dangerous , last year we had 2 guys in major Avalanches and like a miracle both survived.
I love the turbo power don't get me wrong but sometimes a :ORC is in order.
I used to run Viper weights loaded with long solid rivets to the max and a short Green Pink Green spring team roller with a 58-38-46 helix and like I said cut stock carb springs and the air-box slightly opened up internally only, with a 2'' titanium single pipe. At that point the sled did weigh in at 540 pounds dry. It would take any stock sled by at least 1 to 2 sled length right of the line (snow drags) engagement was quite low but 0 track-spin just all go.
I kinda miss this set-up as it was just right there with the 800-900 cc 2 strokes and we all had a ton of fun. Now with the turbo there is no more competition I watch the guys dig around a hillside for a while and than just drive straight up the middle and over the top no challenge and they all get bummed out.
If I go out with other turbos or the crazy mountain nos gang we get into such stupid places that it gets dangerous , last year we had 2 guys in major Avalanches and like a miracle both survived.
I love the turbo power don't get me wrong but sometimes a :ORC is in order.
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