Performance Exhaust

[Nine2Nine]

if its a short track you have no chance of hitting 100mph with the stated mods. the aproach angle of the track won't allow it. XTX is different story!

I have a 136" with 121" Rails, stock, running 108 mph on GPS and plan on more this year..

 

[nytroD]

mine wont go over 95mph give or take. when i called Allen to ask whats up with that, he said thats all the shorties will do. Turk and others have confirmed that as well.sounds like you have a keeper.

 

[shadow44]

mine wont go over 95mph give or take. when i called Allen to ask whats up with that, he said thats all the shorties will do. Turk and others have confirmed that as well.sounds like you have a keeper.

There are tons of guys getting over 100 mph with shorties....14hp will help alot but proper gearing and clutching are a must.

 

[Zakre]

I think the 14HP is an exaggeration, excell is only claiming 6-7HP on there header, the pipe itself is only good for maybe 1hp. Even with the fuel controller 14HP is gonna tough to get. No air box mods either? Sounds tough to me.

Has anyone went with just a header and seen these 6-7HP results?

I would bet Aaron's dyno sheet is available, he stand behind the products coming out of excell.

 

[Nine2Nine]

mine wont go over 95mph give or take. when i called Allen to ask whats up with that, he said thats all the shorties will do. Turk and others have confirmed that as well.sounds like you have a keeper.

Not that the Nytro is fun at 100mph, but sometimes a need to go there..
My luck comes from Schmidt Bros Motorsports. Great crew..

 

[nate007]

Our full system is expected to gain about 6-7, and I would stand behind that claim, but dyno numbers are so subjective it's not hardly worth using them to market a product. No 2 machines are exactly the same, or have the same fuel demands, or are ever ridden in a controlled "dyno-like" environment. They are hardly ever ridden in consistant conditions as it is, and the efi on these machines can't compensate for that anyway, so if it does 6 one day on one trail and it warms up, it might add 4, it might add 7?
Bottom line is that most aftermarket systems will deliver some sort of gain, weather its low-mid, or upper, or whatever, but to say you're going to achive "X" increase is un-realistic.
Before everyone jumps all over me on that one, the only real way to justify a product line's performance is information collected from a large number of samples. I have no idea if there are any maunfacturers out there who will perform before and after runs of 15-20 sleds in many different conditions just to validate their claim, but an "average advertised" would be more realistic. The expense of any company doing that much testing is probably not worth the effort to most, including us. We've ridden our systems on several sleds, and can notice a difference on all of them, so what do we really expect to gain from $1000's of dollars of controlled environment testing just for a bragging right? Nothing more than that, and the cost of all that work and testing has to get added somewhere, right?
Buy a good quality system for its fit and finish, sound or whatever, but definitely don't waste time squabbling over a couple horsepower difference between brands.

 

[mcamzr]

if its a short track you have no chance of hitting 100mph with the stated mods. the aproach angle of the track won't allow it. XTX is different story!

I have a 136" with 121" Rails, stock, running 108 mph on GPS and plan on more this year..

106 out of mine. All Bone stock but a ultimax XS belt and C&A skis. 2 different gps units and a radar gun on 2 different weekends. On a lake about 28 to 30f for the temp. Packed snow no studs.

 

[nytroD]

i was mainly talking about real world conditions. with a few inches of new snow mine wont break 90mph. my Apex on the other hand would always go up over 100mph under any conditions.

 

[shadow44]

Our full system is expected to gain about 6-7, and I would stand behind that claim, but dyno numbers are so subjective it's not hardly worth using them to market a product. No 2 machines are exactly the same, or have the same fuel demands, or are ever ridden in a controlled "dyno-like" environment. They are hardly ever ridden in consistant conditions as it is, and the efi on these machines can't compensate for that anyway, so if it does 6 one day on one trail and it warms up, it might add 4, it might add 7?
Bottom line is that most aftermarket systems will deliver some sort of gain, weather its low-mid, or upper, or whatever, but to say you're going to achive "X" increase is un-realistic.
Before everyone jumps all over me on that one, the only real way to justify a product line's performance is information collected from a large number of samples. I have no idea if there are any maunfacturers out there who will perform before and after runs of 15-20 sleds in many different conditions just to validate their claim, but an "average advertised" would be more realistic. The expense of any company doing that much testing is probably not worth the effort to most, including us. We've ridden our systems on several sleds, and can notice a difference on all of them, so what do we really expect to gain from $1000's of dollars of controlled environment testing just for a bragging right? Nothing more than that, and the cost of all that work and testing has to get added somewhere, right?
Buy a good quality system for its fit and finish, sound or whatever, but definitely don't waste time squabbling over a couple horsepower difference between brands.

Nate..I kind of agree and disagree....dyno numbers are are what they are...every dyno is different and every sleds final number will vary...but to say they are not worth using to market a product..that is where I disagree....most people will buy a product knowing it will make " X " amount of hp...and in most situations the difference in gains will on be a couple of HP. I personally wouldn't buy a product without knowing it will make X' amount of HP..give or take a couple....it gives the buyer an idea of what kind of gains they can expect on average.

 

[kingedwards99]

The reason AAEN has higher HP numbers is because they use a crank dyno where as excell used a track dyno. The track dyno is the more acurate of the two. Non the less AAEN makes a great product as well, as Hindle, and Excell.

 

[shadow44]

The reason AAEN has higher HP numbers is because they use a crank dyno where as excell used a track dyno. The track dyno is the more acurate of the two. Non the less AAEN makes a great product as well, as Hindle, and Excell.

I don't think so kingedwards...AAEN's numbers are at the crank just like everyone else....if they were track dyno numbers...they'd be half that....sleds roughly lose half of their HP at the track....so while a Nytro makes 140ish hp ( just an example ) it would make 70ish hp at the track...so AAENS system would make 7ish at the track....cause if it made 14HP at the track it would be almost double at the crank...and there is NO WAY anyone's exhaust is making 28HP.

 

[Zakre]

...cause if it made 14HP at the track it would be almost double at the crank...and there is NO WAY anyone's exhaust is making 28HP.

I cannot agree with the 28HP, I bet most peoples exhausts are making double that or better, there just has to be a snail in there somewheres

 

[shadow44]

...cause if it made 14HP at the track it would be almost double at the crank...and there is NO WAY anyone's exhaust is making 28HP.

I cannot agree with the 28HP, I bet most peoples exhausts are making double that or better, there just has to be a snail in there somewheres

Not saying it made 28hp...but if KE99 said it made 14hp at the track, that would be equal to 28 at the crank....regardless, AAEN's 14hp claim is at the crank, not the track.

 

[Srxspec]

The reason AAEN has higher HP numbers is because they use a crank dyno where as excell used a track dyno. The track dyno is the more acurate of the two. Non the less AAEN makes a great product as well, as Hindle, and Excell.

Excell did not use a track dyno as they do not have a track dyno. I was with Excell with the full exhaust system on Dynotech's engine dyno (crank) and I have been there myself at Dynotech testing Excell's header into stock muffler and also the full exhaust system again with some different quiet core's installed. A number is a number, all dyno's are different. Go with the one who has the best all around support and is the most familiar with the sleds.

 

[kingedwards99]

My Bad I always thought that the crank dynos where higher than the track dynos, as when they say a silencer makes 6hp, it really makes around 2 to 3 hp on the track dyno, am i wrong?