1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

RX7 Super Turbo

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Old 08-05-04, 12:42 AM
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Cool RX7 Super Turbo

Does anyone know if there has been a super turbo rotary? ya no.....supercharged for low rev boost, with a turbo charger kicking in higher in the rev range, like the old NISSAN Micra Super Turbo (dunno if u know it, the only factory car to my knowledge to has this). Just thought it would be pretty sweet to do this. A blown rotary turbo!!!!!

Any feedback???
Old 08-05-04, 12:47 AM
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some guy did this toa 1g mr2 and got something like 700 horsepower
******* insane
its in one of my friend's SCC magazines
Old 08-05-04, 12:49 AM
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It woild be almost the perfect form of forced induction. No turbo lag!!!!!!!!
Old 08-05-04, 12:49 AM
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It's also known as Compound Forced Induction. Big Trucks used to do this over 30 years ago.

Today, with the properly sized Turbo or supercharger, you get the same benefits, with half the complexity.
Old 08-05-04, 12:53 AM
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Originally Posted by Directfreak
It's also known as Compound Forced Induction. Big Trucks used to do this over 30 years ago.

Today, with the properly sized Turbo or supercharger, you get the same benefits, with half the complexity.

so what your saying is it's not too hard to do?
Old 08-05-04, 12:55 AM
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Its rather ineffecient, and is a space hog. TRD had a factory kit for the 4A series engines a while back.
Old 08-05-04, 01:12 AM
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the guy with the mister 2 said it was an awesome setup, the supercharger boosts instantly to like 6 psi then after 6psi the turbo takes over up to like 14 psi i think he had is set...

******* aswesome concept
Old 08-05-04, 01:20 AM
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if it is sooooo good they why r they so uncommon? U'd think more people would have this septup.
Old 08-05-04, 01:36 AM
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man you gotta think; i'm sure it costs lots o' $$$$$$ to create manifolds and plumbing for that ****.
Old 08-05-04, 01:46 AM
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yeah then all you need is nos....maybe a peripheral port...holy crap outta control
Old 08-05-04, 01:49 AM
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Just what i was thinking.......peripheral port. Maybe try it with a 20B.........or dear i bring it up..........4 rotor! The possibilities! lol
Old 08-05-04, 02:27 AM
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The old Lancia Delta HF Intergral used this for Group B rallying.

That car dominated all, including the drivers. It was more of a "let the car do what it wants, and maybe it will take mercy on you".....killed more rally drivers than almost anything..that car alone got Group B rallying shut down forever...


But man, it was such a great car...

I'd love to see it on a rotary...
Old 08-05-04, 08:43 AM
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I'm guessing the reason that they don't used that setup nowdays is because turbos are made better and spool up faster than back in the days.
Old 08-05-04, 11:55 PM
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Originally Posted by Junia
I'm guessing the reason that they don't used that setup nowdays is because turbos are made better and spool up faster than back in the days.
tru tru. But with this setup, u can have one hulking great big turbo running high revs with outragous power, and this straight from the word go. I cant see how u can beat it thats all.
Old 08-06-04, 12:13 AM
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The old 2 stroke diesels ran blower/turbo combos because they required positive intake pressure to run.At startup and low speeds,the supercharger provided mechanical supercharging at rpms that the turbo could not.At operating speeds the turbo took over.It was more of a neccesity due to the design of the engine,rather than the inefficency of the turbos of the day.
Theres a Camry V-6 powered MR2 that runs a blower/turbo combo.Its WAY,WAY, powerful,but it could still be plenty strong without the extra work of installing the supercharger.
Yah,its cool....but in the end its not really neccesary unless your deathly against any turbo lag.
Old 08-06-04, 12:49 AM
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That is quite possibly the worst idea i have ever seen. Everyone, even my hampster, knows that it is hard to tune, makes less power because of the drag of the supercharger, and just creates more weight and crap to wire in. Get a 4 rotor.
Old 08-06-04, 01:21 AM
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A true twin setup beats it. The Toyota 1J has just about the right combo of turbos that it has next to no lag.
Old 08-06-04, 02:54 AM
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the supercharger has a clutch in the pulley that disengages when the turbo makes the same or more boost. i would complain about the backpressure the turbo still presents while spooling up.
Old 08-06-04, 08:58 AM
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I believe HKS employed its TwinCharger system on the AW11 MR-2. It was pretty insane, but I believe the boost control of the day made the car out of control. Not worth it, IMO. Now, if only someone could combine an axial-flow supercharger and a turbocharger; that would be awesome .
Old 08-06-04, 11:30 AM
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Mazda used twin charging on its diesels at one point ... its a very odd setup with a belt driven squirrel cage fan type blower that is also driven by the exhaust on its other side. Mad ! I think its called a comprex supercharge and its a really odd setup and has somthing to do with pressure waves too as the compressor side is open to the ehxaust !!

... here's a link or two

http://www.lms.ethz.ch/Res/PALOS/anim.html

http://archive.greenpeace.org/climat...7pressure.html
Attached Thumbnails RX7 Super Turbo-hako1221.jpg  
Old 08-08-04, 01:55 PM
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Originally Posted by 787BwannaB
That is quite possibly the worst idea i have ever seen. Everyone, even my hampster, knows that it is hard to tune, makes less power because of the drag of the supercharger, and just creates more weight and crap to wire in. Get a 4 rotor.
Most, if not all (well done..) setups have a centrifugal clutch That disengages the S/C when the turbo is spooled, which could be tuned to whatever RPM needed..

The advanges of this were stagering, considering you'd have NO lag at all, and you could have around 90% of your HP/TQ at a very low RPM, which could pull you around corners with ease, or get you out of that tight situation without worry.

4 rotors are meant mainly for straightline speed...
Old 08-08-04, 05:04 PM
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it WILL run

 
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becuase n2o is easier
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