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Author Topic: New LT4 V8 engines from GM  (Read 4696 times)

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Offline Kelu

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New LT4 V8 engines from GM
« on: June 06, 2014, 06:06:41 PM »
Damn i4 turbo engines, these are sweeter than ever:

http://jalopnik.com/the-corvette-z06-is-underrated-by-25-horsepower-1586906835
Quote
Remember when we said that GM didn't have exact power figures on the 2015 Chevrolet Corvette Z06? The guesstimates were around 625 horsepower and 635 pound-feet of twist. Nope. This leaked SAE dyno chart shows the supercharged V8 putting out 650 horsepower and 650 pound feet of torque. 'Murica!

The new LT4 is a serious bump over the utterly insane LS9 and completely decimates the LS7. But, 500 lb-ft at 1,500 rpm? Yes, Five-hundred-pound-feet-at-fifteen-hundred-rpm.

(Attachment Link)

It's no surprise that GM engineers we spoke with earlier this year say the new Z06 walks away from the old ZR1 around around the Milford Proving Grounds. But it's not all about stonking 0-60 times and quarter-mile runs. The Z06 will dance, and that's what we're looking forward to even more than a warped face and a crushed spine.

http://bangshift.com/bangshiftapex/2015-corvette-z06-650hp-powerful-car-ever-offered-general-motors-stupid-fastness-way/

Quote
Last night General Motors finally announced the horsepower number for the 2015 Corvette Z06 and it is a big one. The car will be rated at 650hp and perhaps more impressively, 650 lb-ft of torque. There will be a manual and automatic option for the first time on the Z06 model with the addition of a paddle shifted eight speed automatic to the manual transmission on the option sheet. The 650hp will do wonders with the lightened up car and this thing will undoubtedly be the fastest production Corvette ever built by a bunch. On the bright side, ZR1 Corvettes have just hit the skids on value for several years so buy one while they are hot!
The supercharged LT4 V8 produces a significant 40% more torque than the former Z06′S 427ci LS style engine. That torque, the light weight, and the sheer number of gears in the two transmissions offered mean that fuel economy will probably be stupendous as well. One of the fun facts about this new engine is that even through a blower is force feeding it, the mill has 10:1 compression. We’re guessing that the amount of control afforded by direct injection allowed engineers to make this move and keep the thing from suffering on that front. The heads have been beefed up as well to deal with all that pressure in the cylinders below them.
We’re going to let GM give you the whole story. SCROLL DOWN TO READ THE FULL PREES RELEASE FROM GM ABOUT THE NEW Z06′S 650HP PLANT!
DETROIT – The all-new 2015 Corvette Z06 is the most powerful production car ever from General Motors and one of a few production cars available in the United States that delivers more than 600 horsepower.
The Z06’s LT4 supercharged 6.2L V-8 engine is SAE-certified at 650 horsepower (485 kW) at 6,400 rpm and 650 lb-ft of torque (881 Nm) at 3,600 rpm.
“The LT4 Small Block sets a new benchmark for power and torque at GM,” said Steve Kiefer, vice president, GM Powertrain Engineering. “The engine also puts the new Corvette Z06 on par with the most powerful supercars offered in America, while delivering performance with impeccable manners that make it suitable for daily driving.”
Compared with other supercar engines, the LT4 is a veritable fountain of low-end torque, producing 457 lb-ft (619 Nm) just off idle and 625 lb-ft (847 Nm) by only 2,800 rpm. The V-12-powered Ferrari F12 Berlinetta, for example, produces about 28 percent less torque than the Z06, despite offering about 12 percent more horsepower – and its peak torque isn’t achieved until 6,000 rpm. The LT4 maintains 90 percent of its peak torque, or 592 lb-ft (802 Nm), from 2,500 to 5,400 rpm.
The new LT4 engine eclipses the Porsche 911 Turbo S engine’s peak power levels by 90 horsepower (67 kW) and 134 lb-ft of torque (182 Nm).
“Torque is the pulling power of an engine and the LT4’s abundance of it at every rpm in the engine’s speed range helps the 2015 Corvette Z06 accelerate quicker and respond nearly instantaneously,” said Jordan Lee, chief engineer for Small Block engines. “It’s the very definition of power on demand.”
The new Z06 engine produces 40 percent more peak torque (180 lb-ft / 244 Nm) than the previous-generation’s 7.0L LS7 engine – and 7.5 percent more than the supercharged 2013 Corvette ZR1’s 604 lb-ft (819 Nm). At 3,200 rpm, the new LT4 surpasses the LS7 by 208 lb-ft of torque (252 Nm). On the horsepower side of the graph, the LT4’s 650-hp rating is 29 percent greater than the LS7’s 505 horsepower (376 kW), and 12 horses more than the ZR1’s LS9 engine.
“The new LT4 engine builds on the design strengths of our previous supercharged engine and leverages the technologies introduced on the Corvette Stingray – direct injection, cylinder deactivation and continuously variable valve timing – to take Corvette performance to an all-new plateau,” said Lee. “Our new, very compact supercharger also helps the engine make power more quickly, and perhaps more importantly, it helps produce more torque earlier in the rpm band.”
“It’s also worth mentioning that the LT4’s supercar performance numbers are achieved with an engine that is nearly the same size as the very compact LT1 engine introduced in the 2014 Corvette Stingray,” Lee said. “The power density of the LT4 makes it one of the smallest and lightest 650-hp engines in the industry.”
LT4 details
The new LT4 engine is based on the same Gen 5 small block foundation as the Corvette Stingray’s LT1 6.2L naturally aspirated engine, incorporating several unique features designed to support its higher output and the greater cylinder pressures created by forced induction, including:
Rotocast A356T6 aluminum cylinder heads that are stronger and handle heat better than conventional aluminum heads
Lightweight titanium intake valves
Machined, forged powder metal steel connecting rods for reduced reciprocating mass
High 10.0:1 compression ratio – for a forced-induction engine – enhances performance and efficiency and is enabled by direct injection
Forged aluminum pistons with unique, stronger structure to ensure strength under high cylinder pressures
Stainless steel exhaust manifolds and an aluminum balancer that are lighter than their LT1 counterparts
Standard dry-sump oiling system with a dual-pressure-control oil pump.
A new 1.7L supercharger spins at up to 20,000 rpm – 5,000 rpm more than the supercharger on the Corvette ZR1’s engine. The rotors are smaller in diameter, which contributes to their higher-rpm capability – and enables them to produce power-enhancing boost earlier in the rpm band. That boost is achieved more efficiently via a more direct discharge port that creates less turbulence, reducing heat and speeding airflow into the engine.
“The Small Block’s cam-in-block design heritage has always enabled very high performance and responsiveness in a small, compact package – an attribute amplified by the performance of our new supercharger’s design,” said Lee.
The LT4 is assembled at the new Performance Build Center at GM’s Bowling Green Assembly Plant and at GM’s Tonawanda engine plant in New York. It is matched with a standard seven-speed manual transmission or an all-new, paddle-shift eight-speed automatic transmission built in Toledo, Ohio.
Designed to deliver shift responses on par with the world’s best dual-clutch transmissions, it is the first automatic offered in a Z06. It also makes the Z06 one of the few cars this powerful to offer the choice of a conventional manual transmission or an eight-speed automatic.
The 2015 Corvette Z06 goes on sale in the fourth quarter of 2014.
(Attachment Link)

http://www.engineswapdepot.com/?p=3696
Quote
GM released the numbers on the new 5th generation LT4 and it destroys everything GM has previously made. The engine has been SAE-certified at 650 horsepower (485 kW) at 6,400 rpm and 650 lb-ft of torque (881 Nm) at 3,600 rpm.

457 lb-ft just off idle
500 lb-ft @ 1,500 rpm
625 lb-ft @ 2,800 rpm
592 lb-ft @ 2,500 – 5,400 rpm

That means just slightly over idle, this engine puts down more torque than most cars do at full RPM. The LT4 is the same size as the 6.2L LT1 and will find it’s first home in the 2015 Z06. It shares the same bore and stroke as the LT1 but uses low compression pistons to allow for supercharging. I expect to see a lot of fifth-gen engines being used in projects when GM starts selling crate versions.

« Last Edit: June 06, 2014, 06:22:33 PM by Kelu »
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Offline Sly Bob

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Re: New LT4 V8 engines from GM
« Reply #1 on: June 06, 2014, 09:25:22 PM »
Sweet! Who's gonna be the first to put one in a Kappa?
Just trying to do my part...

Mods: Lose the chicklets, VentureShield, Dual horns, AfterShock spoiler, Weathershield cover, Lil Chromies, Red calipers with black Solstice stickers, Opel GT antenna and Solo GXP-RCD exhaust with a Solo hi-flow cat!

Offline 2kwk4u

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Re: New LT4 V8 engines from GM
« Reply #2 on: June 07, 2014, 01:36:09 AM »
Engine alone will cost over 25 grand, easy.  Wonder if LS9 crate motors will come down when LT4 becomes available?

Offline U4EA

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Re: New LT4 V8 engines from GM
« Reply #3 on: June 07, 2014, 02:28:40 AM »
Damn, it's still a year away....
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Offline Gentleman Jack

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Re: New LT4 V8 engines from GM
« Reply #4 on: June 07, 2014, 02:14:12 PM »
That's too much tq for a kappa.   It will spin around in circles.
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Offline elff

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Re: New LT4 V8 engines from GM
« Reply #5 on: June 07, 2014, 02:38:33 PM »
No it won't.
The rear won't move until it flips over the top when the tires explode in about 3 seconds
:D

Offline 2kwk4u

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Re: New LT4 V8 engines from GM
« Reply #6 on: June 07, 2014, 03:22:20 PM »
It's not too much power until it can light 'em up in 6th gear... then MAYBE

Offline Kelu

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Re: New LT4 V8 engines from GM
« Reply #7 on: June 07, 2014, 06:01:36 PM »
It's not too much power until it can light 'em up in 6th gear... then MAYBE
Kappa has only 5 speeds  :slap:
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Arabas: take fotos, videos and keep all girls locked inside the house. Kelu's charm is irresistible !!!!

Offline Gentleman Jack

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Re: New LT4 V8 engines from GM
« Reply #8 on: June 07, 2014, 08:37:12 PM »

Kappa has only 5 speeds  :slap:

Correction:

MOST Kappas only have 5 speeds.
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Offline elff

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Re: New LT4 V8 engines from GM
« Reply #9 on: June 07, 2014, 10:00:44 PM »
True Dat

Offline 2kwk4u

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Re: New LT4 V8 engines from GM
« Reply #10 on: June 08, 2014, 12:45:54 AM »
I don't think the stock trans would live long at 650 lb*ft.  Gonna have to get a T-56 or TR-6060 to hold up.

Offline Sly Bob

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Re: New LT4 V8 engines from GM
« Reply #11 on: June 08, 2014, 11:07:47 AM »
Might have to upgrade more than just the tranny.
Just trying to do my part...

Mods: Lose the chicklets, VentureShield, Dual horns, AfterShock spoiler, Weathershield cover, Lil Chromies, Red calipers with black Solstice stickers, Opel GT antenna and Solo GXP-RCD exhaust with a Solo hi-flow cat!

Offline 2kwk4u

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Re: New LT4 V8 engines from GM
« Reply #12 on: June 08, 2014, 12:24:40 PM »
Yep, axles too, at least...

Offline Gentleman Jack

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Re: New LT4 V8 engines from GM
« Reply #13 on: June 08, 2014, 12:26:43 PM »
Let's just agree it's a drivetrain upgrade :)
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Offline Sly Bob

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Re: New LT4 V8 engines from GM
« Reply #14 on: June 08, 2014, 12:28:12 PM »
A big upgrade and one I can only dream of...
Just trying to do my part...

Mods: Lose the chicklets, VentureShield, Dual horns, AfterShock spoiler, Weathershield cover, Lil Chromies, Red calipers with black Solstice stickers, Opel GT antenna and Solo GXP-RCD exhaust with a Solo hi-flow cat!

Offline POS VETT

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Re: New LT4 V8 engines from GM
« Reply #15 on: June 09, 2014, 05:54:09 PM »
There is no such thing as too much power or torque

Offline Sol Asylum

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Re: New LT4 V8 engines from GM
« Reply #16 on: June 09, 2014, 08:30:01 PM »
There is no such thing as too much power or torque

Really?  Ever have a tire change place with some dullard use an impact wrench to reinstall the wheels?
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Offline Gentleman Jack

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Re: New LT4 V8 engines from GM
« Reply #17 on: June 09, 2014, 09:31:51 PM »

Really?  Ever have a tire change place with some dullard use an impact wrench to reinstall the wheels?

^^^^^^

This!
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Offline elff

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Re: New LT4 V8 engines from GM
« Reply #18 on: June 09, 2014, 09:35:25 PM »
Agreed,
but that is not what the original statement was alluding to.

 

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