MPI supercharger on a Vector or Nytro Motor

[snowman4]

Has any body put a MPI on there Vector or nytro?

How do you like it?

 

[Srxspec]

Ran all last season and have tuned 2 others as well. Very forgiving and a great setup! That Vector/Nytro with the Stage 1 supercharger is a real sleeper sled!

 

[HAMMER]

The Nytro (see pic attached) with the larger Rotrex C30-74 (500 CFM) compressor (equivalent to the 28R turbo) would easily be able max out the Nytro’s stock fuel system at 270hp (early media reports by MC-Xpress stated 270 is the max). If you want to go nuts and make cooling systems, fuel system, and compression ratio changes there are two even larger compressors that are in the same C30 family. The C30-84 (572 CFM) and the C30-94 (654 CFM or 400hp range). It takes about 12hp to drive the smaller Stage-I compressors (C15 family weighs 6lbs) and about 24hp at maximum compressor rpm to drive the larger compressors (C30 family weighs 11lbs). The parasitic draw rises linearly with rpm so the hp draw is very low at lower rpms. An equivalent hp rated Lysholm or Roots type for instance would draw 42hp according to their manufactures literature. So there is some real hp potential with the Rotrex superchargers IF the larger supercharger systems are properly developed.

Superchargers are not for everyone. The overwhelming majority of snowmobilers run the big Mits and Garrett turbo's....but....there are a few people out there (like me for instance) that don't want to deal with the things necessary to install and operate a turbo or supercharger at 300+hp for which the smaller Stage-I superchargers are perfect. I just wanted a basic bolt-on performance enhancer leaving everything else 100% stock (especially the engine and exhaust). My sleds power delivery could not be any smoother (it's basically a box stock Apex on steroids). It makes 1-lb boost at 2000rpm and 10-lbs boost at 11,0000rpm. If I had the larger Rotrex compressor it would be the same, just at higher boost levels, like 2-lbs at 2000rpm and 20-lbs at 11,000rpm and it would have the same completely linear power delivery inherent in the Rotrex centrifugal type supercharger. My sleds on-off-on throttle response at low rpm (critical for boondocking) is as quick as the stock Apex and if I smack the flipper to the bar it pulls hard from a stop all the way through to the top. It does not have that turbo lag followed by a neck-snapping surge of horsepower that some people enjoy, its sorta boring in comparison, completely smooth from idle to the rev-limiter.

Good experiences under boost are all about......Setup & State-Of-Tune

 

[mulot30th]

The Nytro (see pic attached) with the larger Rotrex C30-74 (500 CFM) compressor (equivalent to the 28R turbo) would easily be able max out the Nytro’s stock fuel system at 270hp (early media reports by MC-Xpress stated 270 is the max). If you want to go nuts and make cooling systems, fuel system, and compression ratio changes there are two even larger compressors that are in the same C30 family. The C30-84 (572 CFM) and the C30-94 (654 CFM or 400hp range). It takes about 12hp to drive the smaller Stage-I compressors (C15 family weighs 6lbs) and about 24hp at maximum compressor rpm to drive the larger compressors (C30 family weighs 11lbs). The parasitic draw rises linearly with rpm so the hp draw is very low at lower rpms. An equivalent hp rated Lysholm or Roots type for instance would draw 42hp according to their manufactures literature. So there is some real hp potential with the Rotrex superchargers IF the larger supercharger systems are properly developed.

Superchargers are not for everyone. The overwhelming majority of snowmobilers run the big Mits and Garrett turbo's....but....there are a few people out there (like me for instance) that don't want to deal with the things necessary to install and operate a turbo or supercharger at 300+hp for which the smaller Stage-I superchargers are perfect. I just wanted a basic bolt-on performance enhancer leaving everything else 100% stock (especially the engine and exhaust). My sleds power delivery could not be any smoother (it's basically a box stock Apex on steroids). It makes 1-lb boost at 2000rpm and 10-lbs boost at 11,0000rpm. If I had the larger Rotrex compressor it would be the same, just at higher boost levels, like 2-lbs at 2000rpm and 20-lbs at 11,000rpm and it would have the same completely linear power delivery inherent in the Rotrex centrifugal type supercharger. My sleds on-off-on throttle response at low rpm (critical for boondocking) is as quick as the stock Apex and if I smack the flipper to the bar it pulls hard from a stop all the way through to the top. It does not have that turbo lag followed by a neck-snapping surge of horsepower that some people enjoy, its sorta boring in comparison, completely smooth from idle to the rev-limiter.

Good experiences under boost are all about......Setup & State-Of-Tune

I have to disagree for the boring feel you talk about...

I so much better like throttle response on my rx1 in comparison to the apex... In fact apex's throttle response is not that bad, its just not as neck snapping as the rx1 does.

 

[HAMMER]

I have to disagree

Which is fine but note that the question in the title of the thread is:

"MPI supercharger" and there is no mention of "OPCON 2087 twin screw"

One is a fluid driven centrifugal and one is a direct drive positive displacement.

Different principles of operation...different results.

 

[mulot30th]

I have to disagree

Which is fine but note that the question in the title of the thread is:

"MPI supercharger" and there is no mention of "OPCON 2087 twin screw"

One is a fluid driven centrifugal and one is a direct drive positive displacement.

Different principles of operation...different results.

I have not read a lot about this rotrex blowers.

What do you mean by fluid driven?

 

[HAMMER]

What do you mean by fluid driven?

It would be a fairly long explanation so here's the short version. It uses its internal traction fluids shearing action to drive the impeller. At low rpm the traction fluid allows the impeller to actually turn slower than the internal gear multiplication section driving it. As mechanical rpm increases it becomes more difficult for the traction fluid to pass between the rollers increasing the speed of the impeller to match the internal gear multiplication drive section. Ingenious little device and quiet too. It doesn't have the trademark fire engine screaming up the street sound (an engine with a 6-71 blower and solid timing gears) that everyone associates with "superchargers". Basically the Rotrex is a belt driven turbo.

Look under Technology...select Concept
http://www.rotrex.com
-------------
Look under Technology... select Design & Production (visual of operation)
http://www.rotrex.com
-------------
Hot Rod Pump Gas Power Tour (Rotex powered 1160hp+825 lb-ft Nova)
Link 1) http://www.hotrod.com/featuredvehicles/ ... 2_nova_w2w
Link 2) http://www.w2wpowertrain.com/t-novabuild-2.aspx
-------------
Wheel-to-Wheel's Rotrex Media Coverage
(LARGE files so right "click" and "save target as" it works better)
http://www.w2wpowertrain.com/t-Media-2.aspx
-------------

The all Carbon Fiber, Twin Rotrex Supercharged, 1064hp CCXR

 

[mulot30th]

What do you mean by fluid driven?

It would be a fairly long explanation so here's the short version. It uses its internal traction fluids shearing action to drive the impeller. At low rpm the traction fluid allows the impeller to actually turn slower than the internal gear multiplication section driving it. As mechanical rpm increases it becomes more difficult for the traction fluid to pass between the rollers increasing the speed of the impeller to match the internal gear multiplication drive section. Ingenious little device and quiet too. It doesn't have the trademark fire engine screaming up the street sound (an engine with a 6-71 blower and solid timing gears) that everyone associates with "superchargers". Basically a belt driven turbo.

Look under Technology...select Concept
http://www.rotrex.com
-------------
Look under Technology... select Design & Production (visual of operation)
http://www.rotrex.com
-------------
Hot Rod Pump Gas Power Tour (Rotex powered 1160hp+825 lb-ft Nova)
Link 1) http://www.hotrod.com/featuredvehicles/ ... 2_nova_w2w
Link 2) http://www.w2wpowertrain.com/t-novabuild-2.aspx
-------------
Wheel-to-Wheel's Rotrex Media Coverage
(LARGE files so right "click" and "save target as" it works better)
http://www.w2wpowertrain.com/t-Media-2.aspx
-------------

The all Carbon Fiber, Twin Rotrex Supercharged, 1064hp CCXR

I was thinking those rotrex were driven just like vortech superchargers (for example)...

Pretty ingenious

Anyway.. if I were to sell my apex and build another one, it would be a MPI stage 3 or 4 for sure. I better like supercharger over turbo even if there is somewhat less hp.... who care if I have 300 or 320hp anyway.

 

[snowman4]

Hey Hammer thanks for all the info, I learned a lot. MulotTurbo thanks for the input.

The Nytro that I was inquiring about was the 2006-2007 3 cylinder naturally aspirated motor, that has 119.8hp stock.

I had a chance to create a sleeper sled and since Yamaha does not make that chassis/look anymore, I was considering MPI that motor. Just wanted to know if anybody had any issues with that system.

One more thing, when you have a supercharger is it ok to run say a excell exhaust?

Thanks for any and all input this site is great.

 

[snowman4]

Hammer all those threads are very interesting, thanks.

 

[Srxspec]

snowman4, I did not run with the full Excell exhaust, but have installed the Excell header on the supercharged Vector and it works perfect! You won't find a better sleeper sled! You can see one build with install photos, etc at http://www.ty4stroke.com/viewtopic.php?t=34073 ask any questions you may have!

 

[mulot30th]

Hey Hammer thanks for all the info, I learned a lot. MulotTurbo thanks for the input.

The Nytro that I was inquiring about was the 2006-2007 3 cylinder naturally aspirated motor, that has 119.8hp stock.

I had a chance to create a sleeper sled and since Yamaha does not make that chassis/look anymore, I was considering MPI that motor. Just wanted to know if anybody had any issues with that system.

One more thing, when you have a supercharger is it ok to run say a excell exhaust?

Thanks for any and all input this site is great.

Yes a very good idea!

 

[TurboJamie]

I would have been all over a SC for my FX nytro had the tank been bigger. Granted Im not bitching about the tank size like most however I feel the range would be far less then acceptable for me once boosted.

 

[Srxspec]

The 120 Vector/Nytro motor (2005-2007) runs very good with the supercharger installed! This is a chassis dyno comparison from stock with clutching to Supercharged running 8.5 lbs of boost on 91 octane!

 

[kinger]

I would have been all over a SC for my FX nytro had the tank been bigger. Granted Im not bitching about the tank size like most however I feel the range would be far less then acceptable for me once boosted.

There is a new tank coming out 10 gallons + as a replacement to that stocker. Clear too so you can see inside it. Under $400 check the nytro section its in there.