LS7 potential
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Teching In
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LS7 potential What is the REAL potential of the LS7?? It seems like its under rated. With the quarter mile times, doesn't it really have about 530-550HP?
It has a 3" exhaust, high lift cam, heads. Whats up?? Is the 90mm TB too small?
Also since there's been so much talk about a 6.2 NA motor and a supercharged version, do you think the LS7 is only for one year?? A production beast. Like Ford's GT.
HP/torque Hungry
It has a 3" exhaust, high lift cam, heads. Whats up?? Is the 90mm TB too small?
Also since there's been so much talk about a 6.2 NA motor and a supercharged version, do you think the LS7 is only for one year?? A production beast. Like Ford's GT.
HP/torque Hungry
TECH Resident
Joined: Jul 2005
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From: Midland
I asked this question before as well. When I look at it on paper, it should have more than 100 more hp than the LS2. Ported heads, nearly .600 lift, 427 cubes, 7,000 RPM redline, the list goes on and on. You would think it was 500 to the wheels, but supposedly they already tested it to the "new" SAE standards and 505 it is. The astounding thing is that it only pushes 75 more lb/ft than LS2.
Last edited by 91Z28; Sep 5, 2005 at 01:10 AM.
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Joined: Nov 2001
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From: Raleigh, NC
I dont think they are as under rated as everyone thinks. A stock '02+ Z can easily run mid 12s at 116...They dyno pretty consistently around 355 RWHP add a hundred HP and a better torque curve and you get mid 11s at 126. I do think they will have steeper gearing in the tranny which may take away a mph or so over the M12. My guess is that they will dyno around 460 RWHP.
As far as potential goes I think you will see 500-525RWHP with a big cam and LTs on stock heads/intake.
As far as potential goes I think you will see 500-525RWHP with a big cam and LTs on stock heads/intake.
I think you are way off. Car should dyno close to 600 rwhp with large cam and lt headers a 402 is putting down 550 rwhp with a large cam and lt's. These heads flow 370 cfm almost. 600 rwhp with be seen all over the place. Might have to port match the intake to the heads, but it will be a common sight.
Last edited by 52172; Sep 5, 2005 at 11:00 AM.
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From: Raleigh, NC
I guess it is all speculation, but I have seen solid roller C5r 12.5:1CR setups that barely make the 600#. The 500 RWHP mark may be a little conservative but I would speculate we will not see more than 550 RWHP on stock heads/intake.
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Originally Posted by niphilli
I dont think they are as under rated as everyone thinks. A stock '02+ Z can easily run mid 12s at 116...They dyno pretty consistently around 355 RWHP add a hundred HP and a better torque curve and you get mid 11s at 126. I do think they will have steeper gearing in the tranny which may take away a mph or so over the M12. My guess is that they will dyno around 460 RWHP.
As far as potential goes I think you will see 500-525RWHP with a big cam and LTs on stock heads/intake.
As far as potential goes I think you will see 500-525RWHP with a big cam and LTs on stock heads/intake.
The new Z06 does not have the steeper gearing that the Z51 coup and convertible have..it has the standard corvette gearing in a beefed up transmission..that is how it does 0 to 60 without shifting gears...my guess is that the LS7 will make over 600 HP with a real cam with some duration and a LSA down around 110-112..it has a .591 lift cam but no duration (210 intake 230 exhaust) I'd guess that the LSA is 116-118..they have to pass emmisions and have drivability and durability to deal with...big cam LT's, no cats, real exhaust system, and custom tune should make as much as 625 HP at the crank..Chevy always leaves lots of HP on the table for the above stated reasons..just look how your LS1 responds to the mods..there are lots of bolt on cars with cams that make over 400 RWHP out of 346 cu. in. with stock heads..
Originally Posted by niphilli
I guess it is all speculation, but I have seen solid roller C5r 12.5:1CR setups that barely make the 600#. The 500 RWHP mark may be a little conservative but I would speculate we will not see more than 550 RWHP on stock heads/intake.
You better take a closer look at the heads and intake..check this out..I think the LS7 will make 625 all day long with cam, LT headers no cats and exhaust with a custom tune
http://vorlon.case.edu/~aap8/gallery/c6z06media?page=1
Originally Posted by slt200mph
You better take a closer look at the heads and intake..check this out..I think the LS7 will make 625 all day long with cam, LT headers no cats and exhaust with a custom tune
http://vorlon.case.edu/~aap8/gallery/c6z06media?page=1
http://vorlon.case.edu/~aap8/gallery/c6z06media?page=1
Originally Posted by ReVette
What is the REAL potential of the LS7?? It seems like its under rated. With the quarter mile times, doesn't it really have about 530-550HP?
It has a 3" exhaust, high lift cam, heads. Whats up?? Is the 90mm TB too small?
Also since there's been so much talk about a 6.2 NA motor and a supercharged version, do you think the LS7 is only for one year?? A production beast. Like Ford's GT.
HP/torque Hungry
It has a 3" exhaust, high lift cam, heads. Whats up?? Is the 90mm TB too small?
Also since there's been so much talk about a 6.2 NA motor and a supercharged version, do you think the LS7 is only for one year?? A production beast. Like Ford's GT.
HP/torque Hungry
If I remember correctly the industry changed the way HP ratings were done with a new SAE corrected way. I remember something about it was going to be done in front of a third party or something like that so I 'would' figure that the 505 is correct and probably not underrated. I think this was going into affect in the year models '06 for all of the manufacturers.
Now I believe that a lot was left on the table and simple things will net big hp gains.
EDIT: Asians oversell horsepower
GM NEWS - 4/14/05
GM IS FIRST TO CERTIFY HORSEPOWER
AND TORQUE UNDER NEW SAE TEST
PROCEDURE .... GM has become the first manufacturer to certify its
horsepower and torque rating using the new Society of Automotive
Engineers (SAE) test procedure J2723. The 7.0L LS7 engine for the 2006
Corvette Z06 is the first to be certified under the new test procedure
at 505 horsepower @ 6300 rpm and 470 lb-ft @ 4800 rpm.
"The new voluntary SAE power and torque certification procedure ensures
fair, accurate ratings for horsepower and torque as it uses third-party
certification," said Jim Queen, GM vice president, global engineering
and the general chair for the 2005 SAE World Congress. "SAE technical
standards level the playing field and this certification procedure is
just the latest example of the value SAE has offered over the past
century." This is from --->here
Last edited by 5w20; Sep 10, 2005 at 02:29 AM.
505 at the crank..you figure about a 12% loss to the rear wheels...the 405 HP Z06 consistantly put 345-355 HP on the ground..the LS 7 should put 440-450 HP to the rear wheels...keep in mind that the worse one coming out of the factory will make 505...most will make more that...
Launching!
Joined: Dec 2004
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From: California
i read somewere that the c6 with long tubes and a tune to take off all the restrictions ran a 11.5 !!
So of course the z06 is going to be under rated...GM always does this. just like all the camaros and TA's ran a 13.5 on the books but people got a hold of them and started running high 12's pretty much stock
So of course the z06 is going to be under rated...GM always does this. just like all the camaros and TA's ran a 13.5 on the books but people got a hold of them and started running high 12's pretty much stock
