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Old 07-07-2013, 08:02 PM   #69
LOWDOWN
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We ran a 1LE-based Gen-4 Firebird with a supercharged AFR-headed 383 LT1 (490 RWHP) for 5 seasons and 25,000 One Lap miles on the Australian rear axle, before it finally broke. NO R-compound or DR-type tires and about 25 TOTAL 1/4-mile runs. It was then upgraded to a Chev 12-bolt (lighter and less friction loss than a Ford 9").

The 1LE carrier and axles are stronger than the old Aussie log axle...but it is NOT as robust (or heavy) as the ZL1 set-up, which must handle almost 20% more torque than the Z06-tuned LS7.

AGAIN...when GM refers to "Z/28 track performance", they are SPECIFICALLY speaking about road course action (without static or Le Mans-type starts!).

Will a Z/28 acquaint itself well at the strip? Probably...but that is NOT its intended environment...

fwiw...
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Old 07-08-2013, 07:10 AM   #70
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Originally Posted by LOWDOWN View Post
We ran a 1LE-based Gen-4 Firebird with a supercharged AFR-headed 383 LT1 (490 RWHP) for 5 seasons and 25,000 One Lap miles on the Australian rear axle, before it finally broke. NO R-compound or DR-type tires and about 25 TOTAL 1/4-mile runs. It was then upgraded to a Chev 12-bolt (lighter and less friction loss than a Ford 9").

The 1LE carrier and axles are stronger than the old Aussie log axle...but it is NOT as robust (or heavy) as the ZL1 set-up, which must handle almost 20% more torque than the Z06-tuned LS7.

AGAIN...when GM refers to "Z/28 track performance", they are SPECIFICALLY speaking about road course action (without static or Le Mans-type starts!).

Will a Z/28 acquaint itself well at the strip? Probably...but that is NOT its intended environment...

fwiw...
Exactly! Just like the first gen. Z/28 was designed with track/road courses in mind for it's intended environment and not the drag strip. And some people were able to make the first gen. Z/28 a great drag car is spite of it's purpose built function of being a road course car, that too is likely to happen with the fifth gen. Z/28, but that is totally outside of it's original design and intended function.
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Old 07-17-2013, 07:33 AM   #71
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A pretty solid performance and probably driver aided from practice and experience. Just not sure how a Z/28 beats you and your car by another .8 seconds with 300 pounds being the only advantage.

If you want a drag car that is what the COPO was built for. The Z/28 was built for the less straight track.
11 second car only means it is running somewhere in the 11's that phrase doesn't mean 11.00 on the time slip.
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Old 07-17-2013, 08:12 AM   #72
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3 things that the Z/28 has going for it vs other factory production LS7s.

1. the cold air intake.
Even though the accordian tube is still going to be restrictive, it has an open element air filter with a heat shield.

2. EPS
Electric power steering has shown some impressive gains over '12 SS LS3 cars.
My '13 LS3 car baselined 19 RWHP and 22RWTQ over my '12 SS. Same dyno except the '13 got dynoed on an even warmer day!

3.Exhaust
That View of the LS7 that shows the 427 Camaro injector covers definitely has a tri-Y design manifold or shorty header. Waaaay different than the cast iron manifolds that come on the LS3 and LSA cars. If that manifold/shorty header design makes it to production that will help tremendously over previous manifolds.

Those 3 things will make this LS7 more powerful than previous production LS7s. If they rate it at 505 and 470 it will be underrated.
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Old 07-17-2013, 11:01 AM   #73
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The Z/28 is being built for fast drivers, and 300 lbs is not the only advantage. The Z/28 also has less unsprung rotating weight on the axles so it takes less hp to get rolling. It probably has better aerodynamics. But then it's SPECIFICALLY designed and configured for road course so whatever it may do in the 1/4 is a dining table statistic and of no real interest to its intended market.
Don't argue with Doc about unsprung weight....lol...
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