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Old 07-12-2003, 08:19 AM   #1
Ne14korn
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Default compound turbo?

has anyone in nasioc or i-club done a compound turbo? no less a 93 impreza? just looking into it, and had questions.
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Old 07-12-2003, 12:30 PM   #2
SubaFastR
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Do you mean sequential turbo?
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Old 07-24-2003, 09:15 AM   #3
Ne14korn
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in autos class a compound turbo was a super charger and a turbo. is that what you're talking about?
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Old 07-24-2003, 12:55 PM   #4
Charge
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I don't believe anyone's done that...for good reason. You'd tear the tranny apart. The near instant boost you'd see from he supercharger would create havoc, as it would need to disengage quiet quickly as the turbo charger came on line, increasing boost very quickly.

On an AWD car, the transmissions would have a difficult time standing up to the amount of torque you would create so low in the powerband. Shifts would have to be so delicate and precise that it would be tedious to drive.

I think a better option would be two turbos, a smaller one to pick up on boost lower in the range, and a larger up top. However, the difficulty in tuning such a beast would make it hardly worth your while, performance-wise, unless you just wanted to prove you could do it.

Neil
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Old 07-24-2003, 01:02 PM   #5
SubaFastR
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No, same idea though. Most twin turbo setups have a small turbo that spools quickly for power down low, then when the little one runs out of steam, the big one is spooled up. It is more for drivability.
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Old 07-25-2003, 10:12 AM   #6
Ne14korn
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i see, so twin turbo is the way? where to get a twin turbo for a 93 impreza?
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Old 07-25-2003, 12:40 PM   #7
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Out of an Australian/Japanese/NZ Legacy B4... Then again, them being RHD will probably screw it all up.
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Old 07-25-2003, 12:57 PM   #8
SubaFastR
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Quote:
Originally posted by Ne14korn
i see, so twin turbo is the way? where to get a twin turbo for a 93 impreza?
No, twin turbo is not the way. Just buy a turbo kit and learn to tune it. Twin turbos make less power in the name of smoothness.
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Old 07-25-2003, 01:14 PM   #9
Charge
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Just to clarify this...it's one of those questions that are asked a lot on the boards. Lots of people see the twin turbo EJ20's out there and want to put them in their cars. One guy in the U.S. did it, supposedly, but I've never seen him post, just others talk about it.

The Japanese Legacy(and probably other areas as well) had a twin turbo option. It's for smooth spool-up as stated, not for power issues. Could generate more power, possibly, than a single turbo, but the engine management issues to control the boost solenoids and tuning the turbo's and fueling issues would be insane. Truly an amazing feat to accomplish. As I said earlier, you only do it to prove you can, not to lay down big times.

Most people take the twin-turbo engines and convert them to single turbo setups, as the block is obviously the same. Also, you can't easily configure the stock twin-turbo configuration(which would actually be a nice thing if you could use the factory ECU with the fueling issues already basically worked out) because of the RHD arrangement...too much stuff needs to be modified in our cars to get the engine bay to accept it(do a search on this...has been covered in depth....a whole lot of work involved there).

It's a novel idea, but you'll be on your own figuring it out. Good luck if you decide to go that route, it'd be cool. But if money is any kind of option...skip it, and do something a little more practical for now. You can always go back and do that later on after you have a better understanding of the issues involved with modifying these cars.
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