New to the 4stroke world sidewinder mtx power mods?

[hpmaniac]

First post, been riding for 35 years, currently have a couple 2 smoke turbos but wanted to get a yamaha before the new ones are gone forever.
Many confusing reports on to tune or not, some say it wont make much difference at elevation, some say just do intake and muffler on stock tune.
I already ordered the sea level weights and rivits to get up around 73 grams of weight.
Climbmax ,Randy had said in a posti found a couple years ago the tunes are way overrated and do not make a huge difference??
If i do tune i have 3 choices. precision, hurricane, TD from my research these are some top places.
How does the factory tune respond to a cold air intake and quite muffler??

I would like a 50hp bump and not be loud!!
2025 mtx 153, not sure if i will need a162 or not??

 

[Jabber]

I installed the cold air intake from CRracing and their 3" exhaust on my sled about 5 years ago. Stock tune, no issues. The 3" exhaust was just way too loud for my liking. I changed it out to a 2-1/2" MBRP trail quiet muffler, its a game changer in the noise level.
I would suggest that you install the CAI and exhaust and ride it for a bit, you will likely decide its enough power. Adding any more power will be great for straight up the mountain runs, not really gonna help anywhere else.

 

[hpmaniac]

I installed the cold air intake from CRracing and their 3" exhaust on my sled about 5 years ago. Stock tune, no issues. The 3" exhaust was just way too loud for my liking. I changed it out to a 2-1/2" MBRP trail quiet muffler, its a game changer in the noise level.
I would suggest that you install the CAI and exhaust and ride it for a bit, you will likely decide its enough power. Adding any more power will be great for straight up the mountain runs, not really gonna help anywhere else.

Great news, i just want to make sure its safe to add cold air intake and exhaust to this stock tune.
Not sure the ecm has the ability to add fuel in any way but looking at the map or boost sensor? in other words i dont think it adjusts fueling like modern cars do by looking at a wide band sensor and making life fuel adjustments. I know some tuning places are adding this feature.
I saw a post climbmax posted about doing this, just add a cai and muffler to the stock tune and they will make all the power you need for climbing hills. I am glad to see randy swensen still riding, i rode with him back in 2006 i think at the big iron shootout. He wont remember but i do lol. Dude was an animal on his turbo yamaha.

 

[Norse]

Given your name, hpmaniac, you should try a 250+ tuned Sidewinder. Adding a cold air intake and a higher flow muffler can make it too lean, and might need a tune anyway.
I've seen different tunes for different elevations too. The 153" will be plenty, it all comes down to the suspension setup, more pressure on rear shock for steep climbs etc.

I think you will find a noticable difference comparing a stock vs 250hp. Assuming you want the MTX for off-trail?

 

[hpmaniac]

Given your name, hpmaniac, you should try a 250+ tuned Sidewinder. Adding a cold air intake and a higher flow muffler can make it too lean, and might need a tune anyway.
I've seen different tunes for different elevations too. The 153" will be plenty, it all comes down to the suspension setup, more pressure on rear shock for steep climbs etc.

I think you will find a noticable difference comparing a stock vs 250hp. Assuming you want the MTX for off-trail?

Yep, 80% of the riding is off trail in washington state.
Leaning towards the closed loop tune and dash flash package from either precision or hurricane.
I was very surprised how hard these pull in stock form, more than 180 hp that is for sure.

 

[hpmaniac]

Picked up the mtx today. I think I did ok on price, 18500 out door at 3.99% and a 4 year warranty.
I've wanted a turbo yamaha for years and finally pulled trigger knowing this is last chance.
Can't wait to do tuning.
Struggling choosing between precision and hurricane lol.
I have a buddy who has had several sidewinder tunes and he felt like power was very close between all the 270hp tunes but said the precision tune felt the smoothest.