RE: New 'vette V8

[RichardD]

E38Ross said:

I've had infinite mpg from my car and that's not a lie

Over how many miles ?

http://www.pistonheads.com/Gassing/topic.asp?h=0&a...

About 3/4 of the way down

JenkinsComp said:

7 litre V8 C6 Z06

- averaged 40mpg on round trip from Devon to Donington Park and back
- averaged 34mpg on round trip from Buckinghamshire to Switzerland and back

[Bob_Defly]

The Obeast said:

regarding the C7 itll have to look really good to stop me drooling over the C6 zr1. I'm no american car fanboy, but the C6 ZR1 is one of my favourite looking cars of all time.

Time to re-live a great day indeed...

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[elvisburger]

How do you only get 450bhp from 6.2l, when the E90/92/93 M3 is 4l and produces 420bhp?

[RichardD]

elvisburger said:

How do you only get 420bhp from the E90/92/93 M3 when a RadicalV8 gets 500bhp from a 3.2l?

EFA .

( Oh and welcome to PH, Mr Lurker !! )

Edited by RichardD on Friday 26th October 13:50

[PascalBuyens]

BarbaricAvatar said:

I'm sure they did the 26mpg at idle rolling down a hill 5 or 6 times.

I get 20mpg average out of a 602hp supercharged LS3, and I don't really hold back going for it whenever I can. Why would it be so difficult to get 26mp with AFM in a lighter car?

[c6pete]

doogz said:

elvisburger said:

How do you only get 450bhp from 6.2l, when the E90/92/93 M3 is 4l and produces 420bhp?

IIRC, these are rather understressed, and as a result, immensely reliable. If they set out with a power target, what difference does it make what size the V8 that produces it is? Surely it deserves a bonus point for being so reliable. Didn't the previous incarnation of this engine require basic oil changes every 15k, and a belt change at 100k?

Can't remember exactly but it's pretty much oil and maybe filter change for the majority of the annual services. The oil change never costs more than a couple of hundred (and a lot of owners do it themselves) and the engines just keep on going and going. Even the older engines keep on going - cousin in the States has an '84 C4 that still only needs an oil change on most occasions.

They make a slightly nicer noise than the 4L BMW lump as well...!!

[PascalBuyens]

doogz said:

elvisburger said:

How do you only get 450bhp from 6.2l, when the E90/92/93 M3 is 4l and produces 420bhp?

IIRC, these are rather understressed, and as a result, immensely reliable. If they set out with a power target, what difference does it make what size the V8 that produces it is? Surely it deserves a bonus point for being so reliable. Didn't the previous incarnation of this engine require basic oil changes every 15k, and a belt change at 100k?

They also have 2 valves less per cylinder, don't need to rev to 8k rpm to get the claimed hp, a lot smoother/relaxed to drive due to the low down torque, and yes, are a lot more reliable than the BMWs.

[Luca Brasi]

Nice to see some manufacturers still release new high performance n/a engines. Take note BMW!

[Mr E]

lewisf182 said:

£31,000!!! that is just unbeleivable value...

Plus tax, one assumes?

[ecs0set]

elvisburger said:

How do you only get 450bhp from 6.2l, when the E90/92/93 M3 is 4l and produces 420bhp?

TORQUE:
Corvette - 450lb/ft
E90 M3 - 295lb/ft
Radical V8 - 320lb/ft

[lewisf182]

Mr E said:

Plus tax, one assumes?

Ahhh, still for a car that'l hit 0-60 in under 4 seconds I cant see anything in the same segment that comes close?

[Mr E]

lewisf182 said:

Ahhh, still for a car that'l hit 0-60 in under 4 seconds I cant see anything in the same segment that comes close?

For sure, but I think it's closer to 45K than 30K.

[DonkeyApple]

Interesting.

VVT has been used since 07 in the L92 in Escalades, Suburbans etc.

DoD/AFM in the L99 in Camarros with auto boxes.

Both deliver a little less output than the LS3.

I suspect that most of the gains in the Gen V will be coming from the new direct injection.

Re the 2v versus 4v arguement. These engines are built for torque and not power at high rpm as such, 2v is fundamentally superior to 4v.

[E38Ross]

ecs0set said:

elvisburger said:

How do you only get 450bhp from 6.2l, when the E90/92/93 M3 is 4l and produces 420bhp?

TORQUE:
Corvette - 450lb/ft
E90 M3 - 295lb/ft
Radical V8 - 320lb/ft

Now do torque per litre and see any difference.

M3 as 6.2/4=457lb ft and over 640bhp

[papercup]

Bear in mind that 450bhp is a starting figure. This is a standard 6.2 LS3 with a cam in it:



Thats 100bhp increase from a cam. Then you can start on the intake and the heads.

[foxonfirehere]

All this "not stressed" and "how do they only get so little power out of 6.2 litres..."

People need to understand power/torque relationship, specific torque is a good measure either in Nm/litre or Brake mean effective pressure. for a naturally aspirated engine, 100 Nm/litre is good going, to get 9nm/litre from a 2v/cyl. power comes from revs...

[RichardD]

papercup said:

...Then you can start on the intake and the heads.

and maybe finish with a stroker kit to get more grunt!

(Which costs about the same in the US as a few gallons of oil does from a certain three letter German car dealer here )

[V8Bart]

for all the stick we give the Yanks they know how to build an engine!

Though 450bhp 450fpt aint amazing, was with a TVR Griff running those figures on an LS3, and it was a little to smooth for my taste.

[DJRC]

E38Ross said:

ecs0set said:

elvisburger said:

How do you only get 450bhp from 6.2l, when the E90/92/93 M3 is 4l and produces 420bhp?

TORQUE:
Corvette - 450lb/ft
E90 M3 - 295lb/ft
Radical V8 - 320lb/ft

Now do torque per litre and see any difference.

M3 as 6.2/4=457lb ft and over 640bhp

And good luck trying to make that happen.

Once again with...its unstressed. Thats the whole point. The engine isnt wound tighter than Jimmy Savile in a playground on the Vette unlike on the BMW. Which is just the way I like it.

[E38Ross]

Strange isn't it though. Sticking to high revving engines in Bmws just quickly

High revving engine - ph say it's too stressed, needs revving to get the best etc

BMW put a high torque turbo engine in M5 - ph say the high revving engine is better as it's more enjoyable when you want to hoon etc which is how it should be in a sports car

Corvette make a low down torque engine - ph say low down torque in a sports car is just what I want