[rburke76]

need an answer:

the 4cyclinder engine (275hp) is a turbo and takes premium gas. I get that.
the V6 (335hp) is naturally aspirated and takes regular gas. I get that.
The V8 takes premium gas, but is the 455hp engine in the V8, is that a naturally aspirated engine or a turbo engine? If the V8 is naturally aspirated, why does it require premium gas?

anyone help me with this answer?

[HCI2000SS]

The V8 is naturally aspirated, and requires premium fuel to run it's best due to its high output of power and compression

[95 imp]

Originally Posted by rburke76

need an answer:

the 4cyclinder engine (275hp) is a turbo and takes premium gas. I get that.
the V6 (335hp) is naturally aspirated and takes regular gas. I get that.
The V8 takes premium gas, but is the 455hp engine in the V8, is that a naturally aspirated engine or a turbo engine? If the V8 is naturally aspirated, why does it require premium gas?

anyone help me with this answer?

11.5/1 compression. It actually like more than octane than 91/93

[Gunkk]

Originally Posted by rburke76

need an answer:

the 4cyclinder engine (275hp) is a turbo and takes premium gas. I get that.
the V6 (335hp) is naturally aspirated and takes regular gas. I get that.
The V8 takes premium gas, but is the 455hp engine in the V8, is that a naturally aspirated engine or a turbo engine? If the V8 is naturally aspirated, why does it require premium gas?

anyone help me with this answer?

Because GDI. High octane avoids predetonation, which is a concern in high performance direct injected engines.

It matters even more in boosted applications like the turbo 4 where the heated compressed air further risks pre detonation.


It also apparently matters quite a bit for fuel economy ratings, so Chevy saves on their CAFE while you pay. Or you save on gas guzzler tax up front but pay forever.... take your pick.

[rburke76]

Thanks for your answers!

[6sigma]

Originally Posted by 95 imp

11.5/1 compression. It actually like more than octane than 91/93

Agree. But it is interesting that the 3.6 V6 also has 11.5:1 compression and does not require premium fuel. The 3.6 has a higher specific output than the V8 too.

[Deputy Dog]

Originally Posted by rburke76

need an answer:

the 4cyclinder engine (275hp) is a turbo and takes premium gas. I get that.
the V6 (335hp) is naturally aspirated and takes regular gas. I get that.
The V8 takes premium gas, but is the 455hp engine in the V8, is that a naturally aspirated engine or a turbo engine? If the V8 is naturally aspirated, why does it require premium gas?

anyone help me with this answer?

Its because the V8 is a high performance, high compression, high speed race car engine.

[JT58]

I always wondered why so many, actually almost all "performance" cars these require premium fuel. It's really nice to know that the V6 takes regular fuel- and is one of the MAIN reasons I got a V6 Camaro over the V8. You get a lot of performance out of "cheap" gas. And I have a long 80 mile a day round trip commute. My 2011 SS guzzled premium. My 2016 gets more than double MPG of the 2011. Premium is at least .60 more a gallon and not always available. Some stations charge 1.00 more for it. I remember the old days- my high performance Bronco with a 302 V8 and my dad's and friend's cars with powerful V8's- always took plain ole regular gas. Even the Civic SI and my previous Fiesta ST require or "suggest" premium. I tired running 89 octane in the ST and it ran like crap. It needed 93 premium but it at least got 35-39 MPG when I did not get on it. So I do love the V6 in the Camaro. Thinking about it there are not many or maybe even no other engines in a performance car that produce the power of the V6 in the Camaro on regular gas.