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Old 09-16-2010, 12:30 AM   #1
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Top Secret: z28 dyno numbers

just got some info today from a lil birdy; GMPP used a local dyno here to do some testing. The Z28 made8 489RWHP. with a set of custom headers it picked up 44 rwhp. sorry to let the cat out of the bag
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Old 09-16-2010, 01:21 AM   #2
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Sure would like to know how accurate this info is.
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Old 09-16-2010, 01:22 AM   #3
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Old 09-16-2010, 01:59 AM   #4
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if true... that's around 575hp @ the crank w/ a 15% loss. interesting, but sketchy @ best (no disrespect)
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Old 09-16-2010, 02:35 AM   #5
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hope this turns out accurate, but i'm not getting my hopes up until gm says something or I see proof
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Old 09-16-2010, 05:24 AM   #6
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Quote:
Originally Posted by Ernie@PSR View Post
just got some info today from a lil birdy; GMPP used a local dyno here to do some testing. The Z2 made8 489RWHP. with a set of custom headers it picked up 44 rwhp. sorry to let the cat out of the bag
I know its fun to get specific info like this and let it out, but it can be potentially damaging the Z28 program and your local shops prospects of ever working with GM again. That being said, they sure have been going out of their way for the last month or so to tease everyone so it can only be expected. It sure would be cool if the factory could squeeze out an even 500 at the wheels.
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Old 09-16-2010, 07:22 AM   #7
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Hmm.

Why would GMPP need to go to a 'local dyno' to test an upgrade on GM's new engine?

GM has the facilities to do that sort of testing themselves ...
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Old 09-16-2010, 07:26 AM   #8
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Pre-messaging is all the rage these days in marketing. That's why you see spy shots of the z tooling around towns and "secrets revealed" articles in magazines. It helps build buzz.
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Old 09-16-2010, 07:51 AM   #9
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Yeah, GM had to go to some little shop to use their dyno....
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Old 09-16-2010, 08:42 AM   #10
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Quote:
Originally Posted by Ernie@PSR View Post
just got some info today from a lil birdy; GMPP used a local dyno here to do some testing. The Z2 made8 489RWHP. with a set of custom headers it picked up 44 rwhp. sorry to let the cat out of the bag
It made 8489WHP. Holy crap, I hope GM cand find a way to hook that $h!t up... Name:  thud.gif
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Old 09-16-2010, 08:48 AM   #11
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I hope Im not wasting my time building my SS up.
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Old 09-16-2010, 08:52 AM   #12
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If true the z28 will come well built up. But a built up SS is always a good thing. :-)
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Old 09-16-2010, 09:14 AM   #13
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Well, what does a CTS-v put down with a set of headers? I think it should be close to that same number then I'm sure a small tweaking of the tune will easily put 500 to the wheels
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Old 09-16-2010, 09:43 AM   #14
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Well, what does a CTS-v put down with a set of headers? I think it should be close to that same number then I'm sure a small tweaking of the tune will easily put 500 to the wheels
http://www.cadillac.com/ctsV/2010/features-specs/

Horsepower & RPM 556 @ 6100 Torque & RPM 551 @ 3800
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Old 09-16-2010, 09:50 AM   #15
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Originally Posted by Evil35th View Post
Well, what does a CTS-v put down with a set of headers? I think it should be close to that same number then I'm sure a small tweaking of the tune will easily put 500 to the wheels
I would like to know if anyone is privy to such info as well

And this definitly sounds like it was done on purpose, if it's true. They wouldn't need to test on some random shops dyno, they have their own for that. But, like previously stated, nothing helps build anticipation better than a few "leaked" numbers
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Old 09-16-2010, 09:51 AM   #16
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Well, what does a CTS-v put down with a set of headers? I think it should be close to that same number then I'm sure a small tweaking of the tune will easily put 500 to the wheels
CTS-Vs are putting down from 440-470 or so depending on tranny. LTs are about similar to what our cars are putting down, so 40-or-so should at least be expected.

I'm a little skeptical for many of the reasons OP have already pointed out
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Old 09-16-2010, 10:01 AM   #17
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I hope the rwhp numbers keep rising
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Old 09-16-2010, 10:04 AM   #18
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lol obviously we should be skeptical of anything that starts out with "top secret",
but that number really doesn't seem too crazy if they took the LSA and threw on a cai and tweaked the ecu a bit
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Old 09-16-2010, 10:06 AM   #19
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Funny..... the OP posted the 2011 GT500 as making 489rwhp in a previous post, must be his favorite number lol
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Old 09-16-2010, 12:56 PM   #20
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Originally Posted by Jefe's SS View Post
http://www.cadillac.com/ctsV/2010/features-specs/

Horsepower & RPM 556 @ 6100 Torque & RPM 551 @ 3800

Talking about rwhp, not at the crank.
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Old 09-16-2010, 01:36 PM   #21
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"ya..I was building a new cabinet in my garage..."....."Even though I have all the tools I need, I drove across the country to borrow my cousins tape measure."...Sounds a little weird to use a small shop to measure rwhp?
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Old 09-16-2010, 01:44 PM   #22
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Well, his web site has his shop located in Pheonix, AZ. And there has been some other info coming out of that area recently. That actually seems to make the "local shop....yeah right" argument a little less viable
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Old 09-16-2010, 01:45 PM   #23
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Hmm so far all of the testing of the Z28 has been done in Detroit Michigan but the OP is saying this happened in Phoenix Arizona?
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Old 09-16-2010, 01:53 PM   #24
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Last week 2 prototypes were spotted in San Diego.. GM also has desert proving grounds in Mesa, Arizona.. so it is possible for there to be one up in that area.

I do doubt using a local shop for a dyno though.
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Old 09-16-2010, 01:57 PM   #25
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W/ 489 rwhp that would surely whoop GT500's!

Awwwweeeeessssooooommmmmeeeeeee!!!!
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