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Camaro Z/28 Forum - Z/28 Specific Topics Discussions related to the 5th gen Camaro Z/28 model

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Old 10-18-2013, 12:37 AM   #1
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Whats the boost in torque from on the LS7?

I noticed the Z/28 has more torque then the Z06 with the same engine.Does anyone know what changes were made?
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Old 10-18-2013, 05:40 AM   #2
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It's gonna be a HP bump too but Chevy is under-rating it. Open element K&N intake, tri-y shorty manifolds and electric power steering. From my '12-'13 Camaro LS3 cars the electric power steering variable showed up as 20 HP on a dyno. All my power mods were swapped at trade-in and 2nd dyno was in warmer weather. Chevrolet is down playing it by rating it at only 11 more TQ.
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Old 10-18-2013, 05:39 PM   #3
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I'd say it is mostly in the tri y exhaust and the rest of the exhaust system.
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Old 10-18-2013, 06:29 PM   #4
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Better flowing exhaust is probably the biggest change.
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Old 10-19-2013, 08:53 AM   #5
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Quote:
Originally Posted by LS6-M22 View Post
I noticed the Z/28 has more torque then the Z06 with the same engine.Does anyone know what changes were made?
According to Autoblog:
Pankl titanium connecting rods were added, as well as Mahle pistons, and a revised air intake with K&N cold-air induction and exhaust headers.
http://www.autoblog.com/2013/10/16/2...-review-video/

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Old 10-19-2013, 11:48 AM   #6
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Quote:
Originally Posted by garfin View Post
According to Autoblog:
Pankl titanium connecting rods were added, as well as Mahle pistons, and a revised air intake with K&N cold-air induction and exhaust headers.
http://www.autoblog.com/2013/10/16/2...-review-video/

Best regards,

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Does anyone know if the pistons are now forged?
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Old 10-19-2013, 11:50 AM   #7
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Does anyone know if the pistons are now forged?
def not forged.
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Old 10-19-2013, 01:22 PM   #8
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def not forged.
Are you sure? The rest of the engine is.
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Old 10-19-2013, 05:22 PM   #9
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Are you sure? The rest of the engine is.
well from what i know of that most of the motor is.. (forged crank, titainum rods etc) but the pistons arent and thats the LS7's weak point. the hyperteutic pistons arent forged unlike the LS9 which has forged pistons,
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Old 10-19-2013, 06:50 PM   #10
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well from what i know of that most of the motor is.. (forged crank, titainum rods etc) but the pistons arent and thats the LS7's weak point. the hyperteutic pistons arent forged unlike the LS9 which has forged pistons,
These are supposed to be a new piston.
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Old 10-19-2013, 07:07 PM   #11
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interesting, so is compression ratio the same? Remember they said at least 505bhp, I think its closer to 550bhp but I'm still surprised it couldn't go past 161mph it seemed to be stuck there on the straight.
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Old 10-19-2013, 07:17 PM   #12
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Yes I believe the CR is the same. I'm surprised as well at the 505 HP while the Torque has been increased. I'm with you on the HP it is probably closer to 525. The run on the straight obviously was held back due to the wet surface.
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Old 10-19-2013, 07:28 PM   #13
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Yes I believe the CR is the same. I'm surprised as well at the 505 HP while the Torque has been increased. I'm with you on the HP it is probably closer to 525. The run on the straight obviously was held back due to the wet surface.
I don't think it had anything to do with the wet surface, the car wouldn't have "slipped" out of control in that gear, however I think the HP boost is larger than you think it is, check out the tri-y tubular short tube "headers", cold air intake and electrical power steering and possibly some other shit we don't know about, the tune might be more aggressive who knows?
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Old 10-19-2013, 07:39 PM   #14
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Originally Posted by ayousef View Post
I don't think it had anything to do with the wet surface, the car wouldn't have "slipped" out of control in that gear, however I think the HP boost is larger than you think it is, check out the tri-y tubular short tube "headers", cold air intake and electrical power steering and possibly some other shit we don't know about, the tune might be more aggressive who knows?
It could very well be sandbagging. Maybe they've learned a lesson after the ZL1 release?

Intake = 6 HP ?
Exhaust = 9 HP ?
Electric Steering = 5 HP ?
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Old 10-22-2013, 03:44 PM   #15
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I wouldn't doubt it! And there is still time to tweak before the mags get a hold of it. The Z/28 has some damn guts that's for sure. A little tune for added HP is certainly going to be available. And, all that comes with the 100,000 mile warranty! Amazing!
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Old 10-22-2013, 04:00 PM   #16
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I would think the added downforce on the Z/28 is a penalizing factor on top end speed but a positive factor everywhere else with ferocious grip and handling stability that gives it the edge as compared to the ZL1.
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Old 10-25-2013, 09:15 PM   #17
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Quote:
Originally Posted by davidcroft View Post
It's gonna be a HP bump too but Chevy is under-rating it. Open element K&N intake, tri-y shorty manifolds and electric power steering. From my '12-'13 Camaro LS3 cars the electric power steering variable showed up as 20 HP on a dyno. All my power mods were swapped at trade-in and 2nd dyno was in warmer weather. Chevrolet is down playing it by rating it at only 11 more TQ.
There is no way that a modern power steering pump is 20 hp. Not at all. Especially when you aren't actually turning the wheel.
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Better flowing exhaust is probably the biggest change.
Agreed
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Originally Posted by ayousef View Post
interesting, so is compression ratio the same? Remember they said at least 505bhp, I think its closer to 550bhp but I'm still surprised it couldn't go past 161mph it seemed to be stuck there on the straight.
I believe they said 'at least 500 hp', maybe they used 505. Even if they did say 'at least 505' then when it actually does make 505, well they're still ok ... because 'at least' means 'equal to or greater than'

The Z/28 is SAE certified at 505 hp & 481 ft-lbs. You can't under-rate an engine by 10% and maintain SAE certification on it. The Society of Automotive Engineers (SAE) probably wouldn't take too kindly to that. Additionally, the Z/28 hits its power and torque peak at different RPMs than the Z06 does. That doesn't happen if you're just giving placeholder numbers.


As for the 161 mph ... let me put it this way: would you be willing to take a prototype car past 161 mph on one of the worlds deadliest tracks, in the rain?
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Old 10-25-2013, 09:18 PM   #18
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...without delving much into the thread, answering the OP's Q I would safely say the tri-y headers, CAI, and exhaust system comprise the gain.
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Old 11-01-2013, 09:55 AM   #19
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Is it at least 505 hp or is officially 505 hp?
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Old 11-01-2013, 10:58 AM   #20
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Is it at least 505 hp or is officially 505 hp?
Officially 505 SAE certified hp, as per the press release GM issued at the same time as they gave out the Nurburgring video.

Quote:
Originally Posted by GM
The heart of the Z/28 is the 7.0L LS7 engine. The LS7 uses lightweight, racing-proven, high-performance components, such as titanium intake valves and connecting rods, CNC-ported aluminum cylinder heads and a forged-steel crankshaft to help produce an SAE-certified 505 horsepower (376 kW) and 481 lb-ft of torque (652 Nm)
http://media.gm.com/content/media/us...rburgring.html
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Old 12-15-2013, 09:39 PM   #21
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There is no way that a modern power steering pump is 20 hp. Not at all. Especially when you aren't actually turning the wheel.

Agreed

I believe they said 'at least 500 hp', maybe they used 505. Even if they did say 'at least 505' then when it actually does make 505, well they're still ok ... because 'at least' means 'equal to or greater than'

The Z/28 is SAE certified at 505 hp & 481 ft-lbs. You can't under-rate an engine by 10% and maintain SAE certification on it. The Society of Automotive Engineers (SAE) probably wouldn't take too kindly to that. Additionally, the Z/28 hits its power and torque peak at different RPMs than the Z06 does. That doesn't happen if you're just giving placeholder numbers.


As for the 161 mph ... let me put it this way: would you be willing to take a prototype car past 161 mph on one of the worlds deadliest tracks, in the rain?
Recently I would have agreed, but clearly this isn't true of all cars.
Local guy bought a gt500, ran it on 2 different dyno's bone stock. Big numbers.
600 on the dyno jet, can't remember the other one. Got tired of the terrible tranny, sold it and got brand new ZR1. Took to same 2 dyno's. The power difference was way over 28hp. I think it was 40. Head scratcher, but my guess is that 600whp doesn't equal 660 SAE...
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Old 12-16-2013, 12:28 AM   #22
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Recently I would have agreed, but clearly this isn't true of all cars.
Local guy bought a gt500, ran it on 2 different dyno's bone stock. Big numbers.
600 on the dyno jet, can't remember the other one. Got tired of the terrible tranny, sold it and got brand new ZR1. Took to same 2 dyno's. The power difference was way over 28hp. I think it was 40. Head scratcher, but my guess is that 600whp doesn't equal 660 SAE...
Different dynos, even the same dyno on different days can make a difference in power numbers. And most people will say drivetrain loss on a manual car is anywhere between 10-15%. At 10% of 662 would be right around 600 RWHP on the GT500. Dyno's are just a tuning tool...the correction factor can be manipulated to show anything. Hence when the 2011 5.0 came out they had the online dyno showing 395 RWHP which everyone knows was high
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Old 12-16-2013, 12:07 PM   #23
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take it to a dragstrip and make a few passes and get the mph

enter it into to a calculator (google search plenty are out there) and come up with an idea of how much hp you are making

Cheapest dyno by a long shot.

And if you can get a DA reading you can get an even better idea of hp
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Old 12-16-2013, 01:36 PM   #24
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Quote:
Originally Posted by Unobtainium View Post
Recently I would have agreed, but clearly this isn't true of all cars.
Local guy bought a gt500, ran it on 2 different dyno's bone stock. Big numbers.
600 on the dyno jet, can't remember the other one. Got tired of the terrible tranny, sold it and got brand new ZR1. Took to same 2 dyno's. The power difference was way over 28hp. I think it was 40. Head scratcher, but my guess is that 600whp doesn't equal 660 SAE...
There are a dozen different factors that can vary from one dyno to the next. What type of dyno is it, how old/well maintained is it, when was it last calibrated, what is the operator like, what are the conditions like, etc. Even if each is only off by say 1% from 'ideal' when you add it all up you can get some pretty big differences. Thats why everyone says to use dynos as a tuning tool -not for bragging rights.
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