Iker

The only concern I have here
how the hell the new GT2 RS laps 6:47 in Nurburgring! and in the same run it tops 200 mph in the back straight line.. It has a huge wing like this in the ZR1

I am not sure the new ZR1 with the huge wing can go further than 175mph

That's why Chevrolet should introduce the new C8 early! They really need mid engine, DCT and Twin turbo with lower displacement to stay in competition

johnglenntwo

The LT5 has a larger relative chunk of HP they're tapping into. Much of that LT4 lower mid torque had to be tune down, as tuners here have said.
GM appears to have proportioned for that this time!
The GT2 RS is tapping into the good stuff too.
I've learned manually boosting my turbo when, where, and why - Sideways at 60 MPH!

Poor-sha

I don't. It was on a slide in the video posted of GM's announcement at SEMA.

Mad Dog 24

Thanks it is a bit clearer. So the 650\650 @6500 LT4 was a great achievement in the curve. The LT5 appears not to have the same success.... so far. So are the C&D numbers of the LT5 saying that the engine as a whole is peaking towards its max torque?

If I remember the Hellcat has 707hp but only has 580 in torque. So they simply squeezed out the best rpm (warranty safe) to achieve that 707 high number they were looking for? To me this shows a less efficient performance engine design, true?

Ok I'm am a little and should stick to suspensions or some thing else LOL!

johnglenntwo

Since the math doesn't work let us hope the A8, and the Software, can save the day at The Ring.

The GT2 RS is smaller than the Vette!

Hemi Dave

I won't bite for 2 reasons...

1) I got a Demon coming so light on the MUHLA

2) I won't be a 140K Guinea Pig......

ZoratZ06

I think many would agree that the 6:47 by the GT2RS is just a tad 'suspect.' More than likely a very nicely 'massaged' car by Porsche for the Ring.

As for your last statement about DCT, Mid-Engine, TT. I seem to recall the Z06 being just about the quickest car around any track under $500k when it came out. The only thing quicker were million dollar hyper cars and the ACR-E Viper. How is it that Chevyrolet is falling behind again?

The mid engine. DCT, TT Ferrari 488 isn't faster, the Mid-engine, DCT, TT Mac 570-650 aren't faster...heck I'm not even sure the 675LT is quicker around a track. I think you are grossly over stating things here. The ZR1 will likely be the quickest thing around a race track on the market. Even faster than the hyper cars...Doesn't sound like they are 'losing' ground to their competition.

Hemi Dave

So Sean has verified that Tadge is still fibbing a little

Warp Factor

Torque is just a force which doesn't involve motion, and doesn't tell you anything about how well it will move the car.
A measurement of work that can be done (moving the car) needs to involve both force and motion (torque and rotational speed), and that's what we call horsepower.

The horsepower across the rpm spectrum (not just the peak horsepower) is really what what tells you what an engine can do, and the torque figures themselves are rather meaningless. I wonder why they even bother to include them. Tradition, I guess.

Let's say you have one engine with 200 torque, and another with 400 torque. Which will propel the car faster? There's no way to know, because we don't know how fast they are turning.
But lets say that the lower torque engine spins twice as fast as the engine which has twice as much torque. They will have equal ability to move the car, and the horsepower will be the same.
Why? Because the engine which spins twice as fast can be geared down twice as much, doubling the torque, so the usable torque and the power available to the wheels from each engine will actually end up the same.

So again, engine torque by itself is a rather meaningless number. It's the horsepower which tells you what the engine can do, when it comes to propelling the car.

skank

I totally agree with you on the typical Porsche massaged ring times. They have been doing that for a long time. Here is a very good rant article by Dale Lomas of BridgeToGantry about Porsche doing that very thing. The fact that the GT2 RS was 10 seconds faster than their own hypercar 918 and 26 seconds faster than it's sister car GT3 is absurd. The article discusses some of the tactics that Porsche and other manufacturers have used to create quicker lap times than their production counterparts.

http://www.bridgetogantry.com/rant-s...ring-laptimes/

johnglenntwo

He is the only guy that has spoke to a wings blowing off a car on track, as I recall!?

descartesfool

Power is what gets you down the straight. Engine takes fuel's potential chemical energy and converts it to thermal energy via a spark plug's spark and then to a blend of mechanical and thermal energy and then back into thermal energy and some additional chaos of molecules. The car pushes through the air and gives the air molecules kinetic energy and that goes back into thermal energy. At high speed, the air has a very high resistance to a car passing through it, and you need to dissipate a great deal of energy per second to keep it going and accelerating through the air. Energy dissipated per unit time is defined as power. You basically burn so much fuel per second of running at whatever speed. Car increases its kinetic energy due to its mass and speed increasing. The power required to keep a car going fast through the air once it is no longer accelerating is almost all due to air resistance, and the power required goes up as the cube of velocity for a given aero drag. So given a certain drag coefficient and frontal area, add rolling resistance from the tires and bearings which need to be big for high power cars, yu find that the way to go fast on track is to go fast in the straights and for that you need high power. A high power engine dissipates a lot of heat, so it needs large cooling elements and high drag producing air inlets, and high strength materials for all moving parts. That is why so many fast cars on track are heavy these days. High power means high terminal straight speeds for a given lift to drag ratio, and that means high mass unless you use a great deal of exotic materials such as Ferrari and McLaren use with their carbon fibre elements.

You don't really need to bring torque into it. Diesel road cars have high torque, but low power. Gas models of the same car with the same torque but higher power will accelerate much faster. All you really need is HP vs RPM. Peak HP determines the max velocity of the car. That is why the ZR1 which has increased power by a much higher % than it has increased it's weight will likely be much faster than the Z06.

sunsalem

That's kinda mean...

Actually, it's rated at 650lbs.

This is where something like the Lightening Lap is helpful.

rob62

I understand the guinea pig theory but your heading to the lab with the Demon aren't you?

HotHonda

Self explanatory:

rob62

that may be the cheapest yet most effective commercial ever made.

BMadden

Or, you know, maybe people just have an opinion you don't agree with. Shocking, I know, but it happens.

johnglenntwo

From launch on where you want to be!

four0nefive

Fun fact: I went to Safeway after work to pick up dish washing soap and decided to pop into the magazine aisle for a few minutes. I looked for Car and Driver and sure enough the December copy with the ZR1 was sitting there. I guess Chevy couldn't wait to reveal the car on Sunday.

Izzy1000

Why would anyone want to buy this car over a ZO6. The suspension is the same, brakes are the same, Engine has a larger supercharger for just 100 extra HP. The hood is different and so is the front grill. It also has a large wing on the back. I paid $112,000 plus tax for a fully loaded 2016 ZO7. If a loaded ZR1 will cost about $140,000-$150,000 why bother. To pay $20,000 to $40,000 more for a 100 HP is ridiculous