rotrex supercharger

[RiderRocketman]

No doubt about it. The turbo kit is a great bargain as the install cost and downtime is no more than that of putting on a new set of pipes.

Dunringill, that chart references blue-green lines as "Super". You said it has nothing to do with the Rotrex supercharger so what are those lines for?

The last dyno charts for the TTS kit I have are over a year old (posted at the second linked thread I referenced above). I'll see if Richard can send me more recent charts for comparison.

Some of ya all will have to help me with the terminology (centrifugal or something), but I believe another important point is application of boost. As I understand it, both the Turbo Connections turbo and the TTS do not apply a steady boost from idle to redline; rather, the boost kicks in at a certain point. I've been told by racing guys that if you go the blower route, it's better to get one that has a constant boost.

Would appreciate any comments.

I believe you're right that these units do not produce constant boost rate. I'm fairly certain Turbo Connection's turbine uses variable speed technology so that the turbine spins up faster. I am unsure about the Rotrex turbine though. I know that it uses an advanced transmission drive to spin up faster and more efficiently up to a max of 120000 RPM. Constant boost would give the best performance numbers but that also means a less controllable machine. Fine for drag strips but for the street I like that these boost kits leave the bike still easily commanded for everyday riding.

 

[dunringil]

As I recall, Brian at boost is good was experimenting with their own super charger. Not the rotrex unit. And they decided to drop it and go with the aerocharger because the power curve was smoother and more consistent throughout the range where you need power the most.

Even on that diagram you can see the super produces more peak horsepower.

I didn't want anyone to think that this was Rotrex vs Boostisgood.

Like I said, I don't think that is a fair comparison anyways. It's two complete different levels of mods.

If someone wants to do a mod like this, they are probably not torn between the two. They already know which one they want.

Last time I spoke with brian, he mentioned a stage II kit, Haven't heard anything else about it since.

 

[RiderRocketman]

...and use a real turbocharger (not an aerocharger) like echocycles did.

No one makes a kit currently that utilizes a real garrett turbocharger do they? That would make a fair comparison for the rotrex unit...

Not sure what you mean by "real" turbocharger. Turbo Connection's is a much simpler turbo than Echo Cycle's but still a turbo. Echo Cycle uses a Garrett blower, intercooler and internal engine mods (that stage 2 you mention) to keep the engine from blowing apart. I hear their first turbo attempt blew up the stock engine components at around 300 HP. They attained 335 HP with 16 pounds boost with their final setup. Impressive but it looks like a monstrosity I think only Robo-Cop would fit in with. :lol: Those stage 2 mods would be a wallet breaker too since an engine tear down would be needed to install. We're talking the cost of another Rocket. I don't think Echo sells a kit for their setup so I don't think anyone has a kit with a Garrett turbo.

Here's a link to Echo's turbo Rocket: http://www.echocycle.com/mod.php?mod=us ... age_id=179

 

[RiderRocketman]

I forgot. The Turbo Connection kit also includes heavier clutch springs so the install also involves taking off the radiator and getting into the clutch. Still a easier install than the supercharger though.

 

[Scotty]

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[dunringil]

The aerocharger that boost is good, is it's own breed of turbocharger.

It was designed to have zero lag and nearly no exhaust resistance.

So essentially the engine doesn't even know it's there.

As a result, it does not produce the amount of boost you would get from a traditional turbocharger. A traditional turbocharger robs more energy from the exhaust, but the pay off is more boost.

The theory behind the aerocharger is to deliver what you need when you need. No more, no less. This produces the smooth power curve.

A traditional turbocharger produces more than you need all the time and you use some external mechanism to blow off the excess (wastegate). Your power curve can only be as smooth as your method of expelling the excess is.

A lot of the people I know that use turbo's on cars, don't consider the aerocharger as a "real" turbo, since it does not produce max boost at all stages.

Aerochargers were designed to be efficient devices. Wikipedia goes into greater detail than I can; http://en.wikipedia.org/wiki/Variable_geometry_turbocharger

I agree the echo cycles bike is a monstrosity. Impressive but bizzare. You get a bit of that with the Rotrex too. It just hangs there on the engine where nothing is supposed to be. The aerocharger, on the other hand, is invisible. People look my bike up and down all the time and never even notice the turbo.

 

[RiderRocketman]

I've never heard of the term "aerocharger" but have known about the variable vane technology. I guess I'm not a turbo purist. Any compressor running off exhaust fumes is a turbo to me.

Good info, Dunringill!

 

[dunringil]

aerocharger holds a patent on variable area turbine nozzle technology.

So they applied the same technology to the nozzle and managed to patent it.

They were originally a supplier of NASA (aerodyne) but went out of business and the technology has bounced around a bit before landing at http://www.hiperturbo.com

 

[Scotty]

Can anyone post a link to anywhere that does Turbo for Rocket, or refer me to a link on the site if one already exists.. Please.

 

[RiderRocketman]

Far as I know, the turbo kit gets it's air from a filter tucked under/behind the engine and shoots the compressed air through a hookup to the stock airbox piping in that same area. Dunringill would be able to elaborate.

I'm not real worried about my pistons at the current level of boost. Passing the 250 HP mark though I think is asking for trouble. That intercooler in the works for the supercharger might make too much boost for the stock parts. I am quite worried about my clutch and transmission though since I had problems with them before any crazy mods.