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07-21-2008, 02:59 PM
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#1
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Registered User
Join Date: Oct 2000
Location: Kilgore TX 75662
Posts: 3,084
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Horsepower peak @ 5000RPM
This is either a misprint or maybe the folks at GM are being sneaky. Yeah, it only makes 422/400hp@5000RPM (but it makes 440hp@5800RPM.)
I mean, look at the torque peak at 4500.
In the 2009 Corvette, the peaks (with standard exhaust) are 430hp@5900/424tq@4600. Preliminary specs of the G8 GXP LS3 indicate 402hp@6000/400tq@4400.
The only catch that I could see is if it uses variable valve timing, but that's not listed anywhere in the specs.
I can't wait to see the SAE ratings.
__________________
ChestonPhillips@yahoo.com
Quote:
Originally Posted by Bob Cosby
Now we're speculating on the speculation....all the while, throwing more speculation into the mix. Is one speculation (or "most realistic guess") any better than the other speculation?
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Last edited by AdioSS; 07-21-2008 at 03:04 PM.
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07-21-2008, 03:21 PM
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#2
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Super Moderator
Join Date: Jul 2005
Location: Okemos, MI
Posts: 7,542
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What are you referring to? I didn't see anything about 440hp.
__________________
2002 NBM Camaro Z28 M6 - best ET 13.21, best MPH 108.9, best 60' 2.14 - 325hp/343tq - Lid, Corsa, SixSpeedsInc T56, Pro 5.0 w/ short stick, 17x9 wheels
1987 Buick Grand National - best ET 13.66, best MPH 101.5, best 60' 2.08 - 253hp/334tq - 93 chip, RJC, meth, Hooker catback, 160 t-stat, shift kit, no-hop bars
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07-21-2008, 03:28 PM
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#3
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Registered User
Join Date: Oct 2000
Location: Kilgore TX 75662
Posts: 3,084
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that was an example. I don't know what it really makes at 6000RPM.
The DZ302 was only rated at like 290hp despite obviously making more than that, right? Many people joke that it was rated at an RPM lower than where it's peak power really was. I'm suggesting that maybe that idea is being used here also..
__________________
ChestonPhillips@yahoo.com
Quote:
Originally Posted by Bob Cosby
Now we're speculating on the speculation....all the while, throwing more speculation into the mix. Is one speculation (or "most realistic guess") any better than the other speculation?
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07-21-2008, 05:00 PM
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#4
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Registered User
Premium Member
Join Date: Dec 2007
Location: Tree huggin', Bug eatin' Crapifornia
Posts: 79
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Regardless if there is underrating going on, I think it is agreable that 420 horse' is pretty d@mn good. If I can't get a Z28 in a few years, I wouldn't be too sad with this power. I think they're doing a great job thus far.
__________________
-Chuck (your resident Z28 fanatic) Yes, I'm Hell-bent on a supercharged Z28! ( please GM)  2002 Z28 NBM A4 3.23 Lid, C.B., stall, some suspension - 12.6 @ 109 1.6X 60' - all over the limiter
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07-21-2008, 06:06 PM
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#5
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Registered User
Join Date: Mar 2001
Location: TX Med Ctr
Posts: 3,196
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The LS3 doesn't have VVT. If the motor is identical to the Vette motor then the only differences would be the chassis specific exhaust components.
I am more concerned about the L99 in the automatic and how much difference in performance there will be between it and the LS3 cars.
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07-21-2008, 07:00 PM
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#6
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Registered User
Join Date: Jan 2005
Posts: 205
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Quote:
Originally Posted by HAZ-Matt
I am more concerned about the L99 in the automatic and how much difference in performance there will be between it and the LS3 cars.
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Exactly.
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07-21-2008, 07:41 PM
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#7
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Registered User
Join Date: Jun 2000
Location: SoCal
Posts: 3,398
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I think it's a misprint I would have expected the HP peak to be in the 5900-6000 range like the LS3 in Vette and G8 GXP. 
The 3.6L DI is listed at 300hp at 6400.
__________________
2006 Dodge Charger R/T A5, Salesmans special.
4th Gen veteran - 2002 White Z28 A4, 1999 Silver SS 6M #3956, 1997 Black Z28 A4
-Ryan
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07-21-2008, 10:45 PM
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#8
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Registered User
Join Date: Jul 2001
Location: Santa Clara, CA
Posts: 2,436
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Quote:
Originally Posted by AdioSS
This is either a misprint or maybe the folks at GM are being sneaky. Yeah, it only makes 422/400hp@5000RPM (but it makes 440hp@5800RPM.)
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It has to be a misprint.
422hp at 5000RPM is 443 lb ft of torque. Yet the torque peak is 408. So there's something fishy.
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07-21-2008, 10:59 PM
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#9
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Registered User
Join Date: Mar 2001
Location: TX Med Ctr
Posts: 3,196
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Quote:
Originally Posted by dacook
Exactly.
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Well the official GM performance numbers show the automatics to be quicker in the 1/4 then their respective manual models. That is a little odd. They said they "optimized the shift points." Guess torque converter plus the gearing difference makes up for 20 less HP, more weight, and 600 less revs.
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07-22-2008, 01:22 AM
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#10
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Registered User
Join Date: Jul 2001
Location: Santa Clara, CA
Posts: 2,436
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Quote:
Originally Posted by HAZ-Matt
Well the official GM performance numbers show the automatics to be quicker in the 1/4 then their respective manual models. That is a little odd. They said they "optimized the shift points." Guess torque converter plus the gearing difference makes up for 20 less HP, more weight, and 600 less revs.
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Do you have a URL for those numbers? I've not seen any numbers for the Camaro yet.
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07-22-2008, 02:05 AM
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#11
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Registered User
Join Date: Sep 1998
Location: Vancouver, BC, Canada
Posts: 2,547
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__________________
Jason Dove
'95 Dark Metallic Purple Z-28 on '98 Z-28 Rims
383 w/9.5:1 compression, LT4 MTI Ported Heads and Intake, CC305, 12 Bolt and an M6 Swap.
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07-22-2008, 02:16 AM
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#12
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Registered User
Join Date: Jul 2001
Location: Santa Clara, CA
Posts: 2,436
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Quote:
Originally Posted by Jason Dove
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Thanks. It looks like the A6 is very efficient.
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