C7 ZR breaks cover

[Pete]

Originally Posted by Ccmano

While I agree that ideally the LT5 moniker should be reserved for a more “special” engine. Every time I get in my 08 LS3 I am reminded of the easy power and torque these engines put out. I simply have a Vararam cold air intake and a canned tune, I make 400 rwhp. There is gobs of torque through the entire power band. That’s not even the current generation of engines.

I guess I’m saying that they really don’t need to do anything exotic to get large amounts of reliable power. Sure I would luv to see high reving twin cam, vvt, direct injected, twin charged etc. engine.

My biggest fear is that with the mid-engined, twincam 2019 or whatever Corvette, they price the car out of reach. Historically the appeal of Corvette is that of a relatively affordable everymans sports car that can run with more expensive cars. Lose that and Corvette is no longer special. Any of today’s manufacturers can build an expensive, powerful exotic sports car.

Even our ZR-1’s were, back in the day, a bargain for the power and performance you got relative to the competition.
H

Hans
You left out that your LS3 is 376 cubic inches.
An LT5 350 CI can also make 400RWHP with intake porting and newer CATS/ exhaust.
Lets compare apples to apples.
I'm in the process of building a 391ci LT5 looking to get close to 550+RWHP then we can compare torque thru the entire power band.
We are getting the same HP numbers out of the LT5 as any LS based motor (apples to apples) with 30 year old technology and an ECM that has less technology then your old flip phone now imagine if we can add VVT etc.

DOHC TT mid engine priced out of reach compared to what?
I don't see to many 800+hp cars for $100,000- $150,000

Pete

[Hib Halverson]

Originally Posted by Pete

(snip)
Lets compare apples to apples.
I'm in the process of building a 391ci LT5 looking to get close to 550+RWHP then we can compare torque thru the entire power band.
We are getting the same HP numbers out of the LT5 as any LS based motor (apples to apples) with 30 year old technology and an ECM that has less technology then your old flip phone now imagine if we can add VVT etc.

DOHC TT mid engine priced out of reach compared to what?
I don't see to many 800+hp cars for $100,000- $150,000

Pete

If a car with Pete's 391 in it makes 550 at the wheels, using the accepted 82% factor for parasitic loss in a C4 manual powertrain, that's about 670 at the flywheel, which is, indeed, impressive.

The new (and apparently much-hated) LT5 makes 755 SAE net horsepower from 376 cubic inches. Even with the supercharger on it, it weighs less than fully-dressed LT5.

So, the new LT5 has less displacement, is smaller on the outside, is lighter and makes almost 80 more horsepower than a 391 built with the most modern resources one can bring to the original LT5. It also meets GM durability schedules and passes Federal emissions standards.

A year or so ago info "leaked" out of GM implying that the "new" LT5 was going to be a 6.2 L DOHC NA engine but clearly that was "fake news". Nevertheless, one can only wonder if GM Global Propulsion Systems is working on a DOHC 6.2 (LT6 or L88?) for the coming "mid-engine car."

I'm looking forward to seeing credible power and torque dyno numbers from Pete's 670-hp 391.

Are you going to post that info when it becomes available, Pete?

[XfireZ51]

Here’s Mercury Marine showing how u make 750hp NA using LS architecture w a an engine footprint no latger than an LS7. Its as compact and as low as an LS 7 motor using in block cam. It is an LS7 w DOHC Cylinder heads. No FI needed for what is new gen LT5 power. Don’t think anyone could argue w MMR reliability and durability.

http://www.thedrive.com/video/11943/...xid=emailshare

[Jagdpanzer]

Not enough camshafts to be worthy of the LT5 label


Sent from my iPhone using ZR-1 Net Registry

[ssrszz4]

Really though the c4 Zr1 was not an every man car being almost twice as expensive as a base Corvette.

Sent from my XT1585 using ZR-1 Net Registry mobile app

[Ccmano]

Originally Posted by ssrszz4

Really though the c4 Zr1 was not an every man car being almost twice as expensive as a base Corvette.

Sent from my XT1585 using ZR-1 Net Registry mobile app

I didn’t mean to imply that. It was however still a relative bargain compared to cars of comparable performance of the day.
H

[tiegsd]

There might be other ZR-1s, and we may witness the rebirth of the LT-5 (since GM is so fond of recycling engine codes), but there's only 1 King of The Hill!

[XfireZ51]

Hans,

U know and I know that the Corvette will never be taken seriously until it gets a proper powerplant, which today would include a hybrid. But a truck motor ain’t going to get the job done. Its why McLellan did what he did.
U can get prodigious amounts of torque from a diesel motor too but ....
Any thought of producing a mid engine will need to include a modern motor configuration full stop otherwise its a Fiero.

[5ABI VT]

Im dissapointed in how GM is recycling designations for their engines. It makes for a mess and people will begin to talk about it much more very soon. Now theres a genii LT1 and LT4 and a current LT1/4 and now LT5... what a mess.
Styling wise I think its right on par with current manufacturers that are all about excess flares, scoops and spoilers. Clearly Pontiac was a few decades too early

My guess is the dohc engine for the C8 will be a 4L, compact with twin turbos or a supercharger. Hopefully mid engine as well. Leaving the C4 ZR-1 the only DOHC Front engined corvette ever

[ZRapid-1]

Finally unveiled.

Fastest, Most Powerful Vette Ever
With two wings and a top speed of more than 210 mph, the ZR1 is a supercharged superstar



755 horses and 715 lb-ft of torque from its supercharged, 6.2-liter LT5 V-8 engine, with a top speed in excess of 210 mph. There are no 0-60 mph or quarter mile claims yet, but expect mid to high twos to 60 and mid 10s in the quarter.