NA horsepower parts?

[stingray719]

Well if you built a LS motor from Chevy and turbo charged it it would be faster. And if you port the motor in the Viper it's going to void warranty as well. Turbo charged motors either in cars or sleds is the future. And a N/A motor will never keep up with a well built Turbo system. If you turbo charged or supercharge any N/A motor it will be a lot faster.

Yes and don't forget if you boost a motor you also get to mess with it more often.

 

[larrypolaris]

That hp number is prolly about right. Does sound a little low. Never dynoed mine with 0 miles but at 100 miles it made 136.7 hp on D&D dyno. Not sure how their dyno compares to others but an xf7000 did 127hp on their dyno with 0 miles so you can be looking at 10-15hp gain just from the engine breaking in. I'm at 600+ miles now and sled keeps gaining power as I need to keep clutching heavier to keep from hitting rev limiter

Cool to hear the sled keeps gaining power as the miles go up.
I am at 388 miles on my sled.
It pulls hard till 80-ish. Then feels flat after 80.
But I have yet to run it on a good hard pack surface. All the time I rode so far has been in heavier
snow type conditions.

Also too the Viper speedo is reading real speed numbers compared to my other Yamaha's
that were at least 10% off. So on the other sleds you were deceived in to going faster then you really were.

 

[Studroes144]

Yes I'm very happy about the speedometer being spot on. I ride with a buddy who has a nytro and he just can't believe how fast he can ride his sled..I didn't have the heart to tell he it's reading about 10mph too fast lol

 

[shadow44]

That hp number is prolly about right. Does sound a little low. Never dynoed mine with 0 miles but at 100 miles it made 136.7 hp on D&D dyno. Not sure how their dyno compares to others but an xf7000 did 127hp on their dyno with 0 miles so you can be looking at 10-15hp gain just from the engine breaking in. I'm at 600+ miles now and sled keeps gaining power as I need to keep clutching heavier to keep from hitting rev limiter

10-15 hp after break in? Lol, not a chance....a couple maybe.

Guys put way too much stock in dynos for their baseline hp when they should be more concerned with the gains made by adding mods. My Nytro made 139.9 stock at Dynotech...and 127.9 at Hurricane....who's is correct? It was Dave who got me into being more concerned about what we were about to achieve...which was 15+ hp. My final number was 143ish hp.....and my sled has outrun modded Attacks in 1500 ft. My point in all this is to be more concerned with gains and how it runs in the field after...not what your baseline is

 

[wot-75]

My point in all this is to be more concerned with gains and how it runs in the field after...not what your baseline is

+1!

 

[Ikenheimer]

anybody do the port polishing in the midwest?

 

[Studroes144]

My sled with only 100 miles on posted 136.7 hp..the same identical sled with zero miles posted 127 on the same exact dyno..sure some sleds my fluctuate a little in hp but certainly not 9 hp difference. Since the 100 mile mark I've adjusted clutching twice because my rpm keeps running high on me. Only thing changing is the engine getting broke in more. I don't feel anyone can doubt that this sled will make right around 140hp once it's fully broke in. I feel that baseline hp is very necessary to see what parts actually are gaining hp..but one thing to remember is that every time that sled gets hooked to a dyno to make some runs it is continually breaking in more and making more hp meaning that the hp gains prolly seem high than what they actually are. Not singling out any specific performance companies here because it's all done the same way, I'm saying that a gain of 10-15 hp is very much in line from a out of the crate sled to one that is fully broke in. My sled is a great example of that as with only 100 miles it has produced 7 more hp than any stock dyno result I've seen yet and one result I've seen showed mine to have a 9 hp increase and that was on the same dyno mine was on.

 

[stingray719]

My sled with only 100 miles on posted 136.7 hp..the same identical sled with zero miles posted 127 on the same exact dyno..sure some sleds my fluctuate a little in hp but certainly not 9 hp difference. Since the 100 mile mark I've adjusted clutching twice because my rpm keeps running high on me. Only thing changing is the engine getting broke in more. I don't feel anyone can doubt that this sled will make right around 140hp once it's fully broke in. I feel that baseline hp is very necessary to see what parts actually are gaining hp..but one thing to remember is that every time that sled gets hooked to a dyno to make some runs it is continually breaking in more and making more hp meaning that the hp gains prolly seem high than what they actually are. Not singling out any specific performance companies here because it's all done the same way, I'm saying that a gain of 10-15 hp is very much in line from a out of the crate sled to one that is fully broke in. My sled is a great example of that as with only 100 miles it has produced 7 more hp than any stock dyno result I've seen yet and one result I've seen showed mine to have a 9 hp increase and that was on the same dyno mine was on.

Totally agree.

 

[Studroes144]

If anyone wants a true hp reading on performance parts put 1000 miles on your sled then take in to get it dynoed bone stock then start adding your parts. That would solve a lot of hp debates

 

[shadow44]

10-15 hp once broken is absolutely not gonna happen....my sled was dynoed with 2300 miles on it before it was ever modded so it was well broken in. My sled also went to both DTR and Hurricane months apart...with drastically different baselines. I agree the baseline is important to know your starting point, but that's it. Every dyno is different as is every operator in how they load the motor and for how long. Most Nytros dynoed from 136-138 some a tick higher and that was broken in. Yamaha originally said the motor was around 135 ish hp...so I can see 2-3 hp once broken in, 5 tops, but 10-15, doubt'er.

 

[Studroes144]

I'd agree that sleds are all gonna be with a couple hp of each other..what about an out of the crate viper making 127hp and mine making 136.7 hp on the same exact dyno with 100 miles? Like stated they may fluctuate a couple hp but def not 9! I know all of this has no relevance to the topic but the fact that mine produced 9 more hp with just 100 miles should be a good reason for anyone looking for performance upgrades to get all the info they can and compare from there exbaseline engine hp and the number of miles or hours it has and the actual hp number that was gained)

 

[wot-75]

I'd agree that sleds are all gonna be with a couple hp of each other..what about an out of the crate viper making 127hp and mine making 136.7 hp on the same exact dyno with 100 miles?

Maybe this?

http://www.ty4stroke.com/viewtopic.php?t=125124

 

[scott32]

9000 miles on my Apex. I must be over 200hp by now.lmao. bustin' balls boys

 

[shadow44]

I'd agree that sleds are all gonna be with a couple hp of each other..what about an out of the crate viper making 127hp and mine making 136.7 hp on the same exact dyno with 100 miles? Like stated they may fluctuate a couple hp but def not 9! I know all of this has no relevance to the topic but the fact that mine produced 9 more hp with just 100 miles should be a good reason for anyone looking for performance upgrades to get all the info they can and compare from there exbaseline engine hp and the number of miles or hours it has and the actual hp number that was gained)

Both sleds dynoed on the same day?

So you think your sled will be at 146-151 hp in 1000 miles?

 

[Studroes144]

I'm figuring they all should be anywhere around the 138-140 hp once completely broke in. 127 bone stock with zero miles. By the time 1000 miles roles around I'm sure they will be darn close to 140 hp if not there. If my math serves me correctly that would be 10-15 hp. Did your nytro come right out of the crate making 139.9 hp with zero miles on it?