CNC PORTED NYTRO HEAD

[XtremeSpeedShop]

Should have my head done here soon with the flow numbers. We will be able to work the head to work with bored throttle bodies etc. This is only the start of some crazy hp

 

[christopher]

Will be very cool to see the final numbers from your creation!

 

[SNWMBL]

I'll be a test dummy for an N/A sled if you feel like giving a price break, lol.

 

[twincam88]

would that head work decent with stock cams/compression? where caa a guy get cams for n/a? im really thinking i want this done to my sled!!!

 

[ruffryder]

I'll be a test dummy for an N/A sled if you feel like giving a price break, lol.

Me too, but I am only 5 miles away... lol yes, I did just try and nudge you out of line... ha ha

edit, but my broke arse puts me in the back of the line...

 

[XtremeSpeedShop]

The head will make any Nytro run better, but to get the full potential it would really help to combine it with other mods. On a N/A motor I would like to see at least a good exhaust and some decent cam shafts, that would wake the motor up a ton. Then like anything you could add compression, bore throttle bodies, big bore/stroker etc. I think a head,cams and exhaust would make the Nytro very fun to ride and give you that extra HP to hang with the 800cc class.

Here is the web cams link...

http://webcamshafts.com/mobile/snowmobile/yamaha/yamaha_stx_-_fx_nytro_(08-11)_dohc_12v.html

 

[XtremeSpeedShop]

Just a side note, we should be testing this head and also Impulses new timing control on the stand alone. This will be huge! Unless you can control timing there is no way to get the most out of your engine.With different fuels, compression, cams, big bore etc you need to be able to control fuel/timing not only on boost all through the RPM range. We will be able to add timing to increase bottom end response and take away as need for big boost. If you want to run with the big dogs this is going help big time. Also with correct set up, idle is just fine with bigger injectors. We will be testing all summer with our Nytro motor in a custom Raptor Drag quad we are building....

 

[Tarzannr1]

Should have my head done here soon with the flow numbers. We will be able to work the head to work with bored throttle bodies etc. This is only the start of some crazy hp

Pictures of trottlebodies please
What does this do if you bore trottle bodys?
Have you got the flow numbers?

 

[sled-fiend]

CNC ported, +1 valves, kibblewhite valve springs. This is one bad head! Pricing coming very soon!

Pm'd u on 05/21, did u receive it?

 

[christopher]

Looking for a project UPDATE.

 

[XtremeSpeedShop]

Sorry guys been slammed here at the shop and trying to get this done in a few weeks...

Updates and flow numbers soon!

 

[christopher]

Nothing wrong with being SLAMMED.
That means there are people out there that think your making a good product and want more of it!!

 

[XtremeSpeedShop]

Some numbers for you guys......

Stock nytro flow numbers

in
.100=59.03
.200=147.67
.300=185.74
.400=199.91

ex
.100=69.4
.200=127.32
.300=159.76
.400=176.40

ported in with plus 1 valves

.100=96.34
.200=173.15
.300=218.79
.400=232.96
.500=239

ported ex

.100=77.71
.200=138.90
.300=176.40
.400=184.72

Been testing all summer and have had great results!

 

[ruffryder]

What do you think that will equate to as far as hp numbers for a stock sled? I assume custom camshafts will be required?

 

[XtremeSpeedShop]

Not sure on Hp on a stock motor to be honest, I'm sure with exhaust, cams, intake and some mapping you would see some good gains.

 

[08nytromtxa]

head

anyone have any seat time on this head in the snow yet. liking it, any info would be great thanks

 

[XtremeSpeedShop]

Sent out a few heads, hopefully we can offer some more feed back from customers! We have beat the crap out of this set up all summer long and have had great results. Quicker spool up, more MPH and the valve train has help up to 30psi. Hopefully we will have our tube chassis done soon to offer some sled videos!

http://youtu.be/MILWVDoxBKE

 

[Iceman56]

Sent out a few heads, hopefully we can offer some more feed back from customers! We have beat the crap out of this set up all summer long and have had great results. Quicker spool up, more MPH and the valve train has help up to 30psi. Hopefully we will have our tube chassis done soon to offer some sled videos!

http://youtu.be/MILWVDoxBKE

What compression do you run with 23psi boost on E85? What elevation?

 

[philsummers21]

Holy christ that raptor is fast. Makes me really want to put a new motor in the RZR

 

[XtremeSpeedShop]

What compression do you run with 23psi boost on E85? What elevation?

We run Impulse spec CP pistons, no head shim, 9:2 compression, we run at sea level.

Our Raptor we ran 11:1, 24psi at seal level on E85