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How much boost is the Radix good for?

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Old 04-11-2005, 11:58 PM
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Default How much boost is the Radix good for?
What is the smallest pulley available for the Radix, and what is the corresponding boost? I'm starting to put together a plan for my new setup.
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Old 04-12-2005, 12:00 AM
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Originally Posted by thunder550
What is the smallest pulley available for the Radix, and what is the corresponding boost? I'm starting to put together a plan for my new setup.
boost depends on many many things. smallest pulley available 2.75".
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Old 04-12-2005, 01:52 AM
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Then I'll describe what I'm aiming for. I want to put in an LQ4 block with a mild cam designed for FI, and heads that will maximize compression based on how much boost the Radix will put out. I figured that getting a number for psi would allow me to start looking at what kind of heads to buy. Shooting for ~650hp flywheel.
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Old 04-12-2005, 02:27 AM
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LQ4 with stock 72cc Heads and stock 9.4-1 compression ratio and the radix with a 2.8" pulley = about 10 lbs of boost ala BlownChevy.
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Old 04-12-2005, 08:58 AM
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Is that about the most you can stuff in there without detonation or is there room for a little bit more?
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Old 04-12-2005, 12:37 PM
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At one point I was making 12lbs with a 3.25 pulley
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Old 04-12-2005, 02:50 PM
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did you weld something over the intake ports or what??

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Old 04-12-2005, 05:28 PM
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Originally Posted by thunder550
Is that about the most you can stuff in there without detonation or is there room for a little bit more?
I suppose it would depend on a few things but I'd be willing to bet you could get a little more.
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Old 04-12-2005, 05:30 PM
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Originally Posted by thunder550
did you weld something over the intake ports or what??


That was on a 4.8L
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Old 04-12-2005, 05:54 PM
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Excessive boost isn't needed. Build the motor to be effecient and it will run good. Of course, more boost is usually better, but not always.

On a 6.0 I would shoot for ~9:1 CR and go from there.
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