09 G8 GT Hp Rating - LS1TECH



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09 G8 GT Hp Rating

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Old 12-17-2011, 01:10 AM   #1
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Question 09 G8 GT Hp Rating

Looking to buy one but i see the 6.0 comes with only 361 hp?? can this be right i thought they had 400hp like the 05 gtos? im confused, can anyone help me
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Old 12-17-2011, 01:33 AM   #2
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Looking to buy one but i see the 6.0 comes with only 361 hp?? can this be right i thought they had 400hp like the 05 gtos? im confused, can anyone help me
Because of AFM the cam shaft is smaller then what you would find in a LS2.

Stock G8 L76 cam: 200/208 .472/.479 116 LSA

Stock GTO LS2 cam: 204/211 .525/.525 116 LSA
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Old 12-17-2011, 11:34 PM   #3
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An intake and tune will bring it to 400hp and you can disable AFM too.
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Old 12-18-2011, 12:03 AM   #4
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i dynoed 340 rwhp 350 tq with my only Real mod being gutted cats, and a smooth intake pipe to the stock airbox. so im actually now at would be considered 400+ crank hp..
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Old 12-19-2011, 01:47 PM   #5
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i dynoed 340 rwhp 350 tq with my only Real mod being gutted cats, and a smooth intake pipe to the stock airbox. so im actually now at would be considered 400+ crank hp..
Great mph for the lack of $ mods. I have run similar, but with the mods in my sig.
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Old 12-19-2011, 04:30 PM   #6
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Great mph for the lack of $ mods. I have run similar, but with the mods in my sig.
I would love to hear your exhaust.... any video clips?

I like how the stock mufflers sound when I step on it but around town itís too quiet.
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Old 12-19-2011, 05:12 PM   #7
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Quote:
Originally Posted by GMCHammer View Post
Because of AFM the cam shaft is smaller then what you would find in a LS2.

Stock G8 L76 cam: 200/208 .472/.479 116 LSA

Stock GTO LS2 cam: 204/211 .525/.525 116 LSA
Quote:
Originally Posted by Midnight00SS View Post
Looking to buy one but i see the 6.0 comes with only 361 hp?? can this be right i thought they had 400hp like the 05 gtos? im confused, can anyone help me
Yeah stupid DoD! I would get rid of it... the 2009 also has a few less hp because they installed an extra set of cats that werent on the 08's.

Just for comparison to your specs above here are the LS9 cam specs:

211/230 .558/.552 122.5

Its only a $100 cam from GM, replace the lifters with LS7 units, pushrods, valley cover. You have a cheap DoD delete kit that might only cost you $500 and have a nice 40+hp gain.
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Old 12-19-2011, 06:45 PM   #8
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Hey Slow does the LS9 cam have a lope to it?
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Old 12-19-2011, 11:04 PM   #9
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Hey Slow does the LS9 cam have a lope to it?
None, idles like stock.
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Old 12-19-2011, 11:16 PM   #10
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That won't cut it, if I install a performance cam I want people to know my car has a cam.
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Old 12-19-2011, 11:39 PM   #11
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Quote:
Originally Posted by GMCHammer View Post
Because of AFM the cam shaft is smaller then what you would find in a LS2.

Stock G8 L76 cam: 200/208 .472/.479 116 LSA

Stock GTO LS2 cam: 204/211 .525/.525 116 LSA
Quote:
Originally Posted by RedHotG8 View Post
An intake and tune will bring it to 400hp and you can disable AFM too.
ok i see now i wasnt aware of this, didnt know about the afm unit either, im amazed it runs on 87 octane also lol
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Old 12-19-2011, 11:42 PM   #12
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The ECM pulls timing if you run regular gas, so you're losing some power. I tuned mine to run on premium and I can feel the difference.
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Old 12-20-2011, 05:56 AM   #13
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That won't cut it, if I install a performance cam I want people to know my car has a cam.
I took out my 235/242 .618 114 and everyone knew within a half mile that the car was cammed... it was fun but after two years with that setup I wanted something a bit different.

Now I have the OEM LS9 cam, car idles like stock, and is faster! Granted I added a blower... haha
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Old 12-20-2011, 06:27 AM   #14
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if you get an 09.5 you have 355 hp
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Old 07-28-2016, 10:58 PM   #15
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Originally Posted by GXPPOWER View Post
i dynoed 340 rwhp 350 tq with my only Real mod being gutted cats, and a smooth intake pipe to the stock airbox. so im actually now at would be considered 400+ crank hp..
I just had the top end on my g8 worked on replace the lifters, springs, pushrods , bigger cam 240 duration to the exhaust with all ls3 parts . Put it on the dyno and it put down 373 rwhp
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Old 08-04-2016, 11:03 PM   #16
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Stock exhaust and untouched heads I am guessing? That's a big cam.


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Originally Posted by Jv9437 View Post
I just had the top end on my g8 worked on replace the lifters, springs, pushrods , bigger cam 240 duration to the exhaust with all ls3 parts . Put it on the dyno and it put down 373 rwhp
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Old 08-05-2016, 07:39 AM   #17
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[QUOTE=VINCE;19349138]Stock exhaust and untouched heads I am guessing? That's a big cam.[/QUOTE

It is a big cam, but I have magna flow exhaust and the heads were redone also before this was done . The only thing I have left to do is put on some long tube headers but havent decided which ones I want to put on. Do you have any suggestions on which ones are better?
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