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03-26-2015, 12:28 AM
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#1
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Theoretical Boost Question
I'm about 10.7CR now on my all aluminum LS motor. I have forged pistons and rods, high end fasteners all around, so even with the nodular crank, it should be able to handle 600+WHP all day long without breaking a sweat. I'd never even really want that in a street car honestly, but just curious, how many pounds of inter cooled boost from a centrifugal blower it would take with 91? I'm thinking not whole lot, maybe 6psi max. 
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03-26-2015, 07:56 AM
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#2
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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You'll need more than 6 psi, have to account for power loss of the blower, even at the CR. Also I don't think you could/should run more than 6psi at that compression.
600hp is a hoot though.
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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04-02-2015, 08:45 PM
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#3
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Senior Member
Join Date: Jan 2010
Posts: 1,255
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My motor runs about 6 pounds and it should be good up to about 10 ish with my CR of 10.5
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2006 CTS-V
1993 Trooper
1991 Impulse RS
1988 Trooper II SAS
1986 TrooperII (No Rear)
1988 Impulse (dead)
1983 K20
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04-02-2015, 11:35 PM
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#4
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Thanks. At least for now, definitely going to keep it NA. If a proper exhaust and a retune gets me to a 420, and especially with more under the curve, not just peak, I think I'll be happy. It's fairly ridiculous for a streetcar as it is at 390WHP, 3,100lbs, and relatively short gearing.
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04-06-2015, 08:53 PM
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#5
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Senior Member
Join Date: Jun 2009
Posts: 2,509
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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04-07-2015, 11:08 AM
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#6
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Ran accelerator for years to move octane to about 93. My compression was about 11.2:1.
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04-18-2015, 01:08 AM
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#7
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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ImageUploadedByTapatalk1429344287.478098.jpg
7lbs max intercooled G. And I melted a piston staying within their limits. Plus, it depends on the type of forging. 4032 forging isnt good enough for boost. You need the 2618.
Stick with a chemical supercharger for days when you want to tear it up in 3rd gear 
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I <3 forced induction.
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04-20-2015, 08:22 AM
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#8
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Senior Member
Join Date: Jun 2009
Posts: 2,509
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Chemical sc?
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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04-20-2015, 08:30 AM
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#9
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Quote:
Originally Posted by Damian
Chemical sc?
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Giggle gas
__________________
Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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06-04-2015, 02:46 AM
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#10
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Senior Member
Join Date: Jun 2008
Posts: 624
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I was at 600rwhp with 7-8psi of boost on 91 with my ls3. Stock crank too, they'll handle 900 HP so don't worry. About 10.5cr here
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