Super Chargers.

Discuss the RB20, RB25 and RB26 series engines.
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OKRB20DET
Posts: 498
Joined: Sat Jul 02, 2005 5:16 am
Car: 1990 S13 coupe

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if anyone has any photos or links to info on super chargers on the RB series motors please post em up thanks

*hope this is ok for this specific forum*


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Nameless EJ6
Posts: 1228
Joined: Sun May 11, 2003 9:24 pm
Car: What the **** do you think.

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Turbo > supercharger

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themadscientist
Posts: 26254
Joined: Tue Nov 12, 2002 3:30 pm
Car: R32 GTR, DR30 RS Turbo, BRZ, Lunchbox, NSR50 Sportster 883 Iron
Location: Staring down at you with disdain from the spooky mountaintop castle.

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nobody makes a kit, you would have to make it yourself.

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Audi180
Posts: 183
Joined: Tue Jan 20, 2004 4:03 am
Car: RB26'd S14
Contact:

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twin turbo + Supercharger rb26...


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virus77
Posts: 1775
Joined: Thu Mar 25, 2004 9:43 am
Car: 95 S14, 71 240z, 97 e320

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Id like to see a dyno of that damn thing, I would personally still stick with just turbos, but thats pretty sick.

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Eikon
Posts: 6928
Joined: Sat Apr 24, 2004 3:20 am
Car: 71 240z, 93 Supra TT
Location: Lake Orion, MI
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yeah... for those times when 1000hp just doesn't do it for you!


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Wulfgang
Posts: 908
Joined: Tue Oct 28, 2003 5:41 pm

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Supers have their place, but IMHO it would be hard to justify supercharging an RB (unless you just want to say "I did it" like the guys that built that insane setup above).

The big advantage of superchargers is that they can provide excellent throttle response due to their operation and often also due to their installation (right on top of the intake valves). IF you need to run large boost to make good power (like on a 2.0L RB20), then you must use an intercooler, which sort of defeats the purpose (unless you use an air-to-water IC which means lots of extra plumbing). Adding an IC kills throttle response no matter how well you do it.

So superchargers are prime candidates for lower boost applications, which means you can use higher compression ratios. And that is another thing counting against RB's, with their lower compression ratios.

IMHO, non-turbo engines like the KA are perfect for supercharging. They have high compression ratios and (sometimes) more displacement meaning you can run lower boost and still make big power. This enhances the chief benefit of the supercharger: throttle response.

With an RB you have an engine that was designed from the ground up to be turbocharged, and that makes it a bit of a stretch as a supercharging candidate.


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