996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Rear mounted turbos wtf

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Old Feb 7, 2005 | 10:29 PM
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Rear mounted turbos wtf

Sort of off topic, but not as much as you would think as I hear there are more and more big blocks running around with these lately. I've never even heard of this until recently. What do you guys know about this?

http://chevyhiperformance.com/techar...48_0502_turbo/
 
Old Feb 7, 2005 | 10:39 PM
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I dont understand how that works. A turbo must be mounted on a header on the exhaust side of a header. Can somone please inform me on this, Im puzzled.
-Daniel
 
Old Feb 7, 2005 | 10:41 PM
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Seems kind of pointless to me - any benefits of the lower temps will be negated by the pressure drop with all that tubing. Turbos get way hotter than any other thing in the engine, I doubt they are really affected by engine bay temps (the air may be, but not the turbo). Plus, an intake sitting on the bottom of the car, and the turbo being almost the lowest point of the car, do not strike me as great ideas. Maybe for a drag only car or something...

Still though, kind of a cool innovation. I still think the steam driven turbo concept is the coolest (use steam from exhaust temps to drive a turbine instead of the exhaust gas pressure).
 
Old Feb 7, 2005 | 10:45 PM
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Originally posted by mpwrmodena
I dont understand how that works. A turbo must be mounted on a header on the exhaust side of a header. Can somone please inform me on this, Im puzzled.
-Daniel
The turbo needs to be mounted somewhere, anywhere, in the exhaust tract to use the energy of the exhaust gases to drive the turbine. It can be mounted by the exhaust tip or at the collector pipe of the manifold. However, the reason you always see the turbo mounted on the exhaust manifold is because the closer it is to the exhaust ports on the head, the hotter the gases are. Once the exhaust gases lose heat, they lose energy, this leads to lag and inefficiency. Anothe reason for mounting the turbo near the engine is so the intake tract is short as well.

Anyway, IMHO this is not a bright idea.
 
Old Feb 7, 2005 | 10:52 PM
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I guess it works pretty well from what I've heard. Basically they say that the intake tract is no longer than if you had a normal intercooler system, which this system doesn't need. They claim the exhaust is denser, and run smaller exhaust turbines combined with lower boost to make up for it .So lag isn't that bad. I dunno enough to argue one way or another, just thought it was pretty cool. Obviously it's not going to make more power than a "real" turbo setup, but I guess it's easier to install, cheaper, etc.
 

Last edited by limitup; Feb 7, 2005 at 11:02 PM.
Old Feb 8, 2005 | 08:57 AM
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Some what of a good idea but probably won't last long in the hands of a young kid.
 
Old Feb 8, 2005 | 09:20 AM
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sat and watched one of these get installed on Hot Rod TV I belive, great idea, sounds like it was pretty effective. We'll see how the technology advances
 
Old Feb 8, 2005 | 10:08 AM
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I work part time for a Turbo Drag race team, Paisley racing at www.craigpaisley.com. So I have alot of knowledge in building turbo motors. Why try and reinvent the wheel?
-Daniel
 
Old Feb 8, 2005 | 10:10 AM
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why not try to do something different, if people didn't try to reinvent stuff the world would be pretty dull.


Since you work for a drag race team it should be pretty obvious to you how this works
 
Old Feb 8, 2005 | 10:28 AM
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I understand the concept but it seams very silly to me. The only thing that should have a Turbo under the back of the car is a 911 turbo.
-Dan
 
Old Feb 8, 2005 | 10:45 AM
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what's silly other then it's different? What do you think won't work about it. I'm trying to figure these things out myself.
 
Old Feb 8, 2005 | 11:16 AM
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Hard to Explain & Understand. yet its been done WOW!!!
 
Old Feb 8, 2005 | 02:09 PM
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here is my pontiac gto*****VIDEO*****

with a rear mount turbo

not bad for a beater

rear mount turbo gto
 
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