what engine should the G6 GXP have?

- Concpet G6 had a 285HP/272tq Supercharged 3.5L pushrod V6
- a 3 valve 3.9L HV V6 is said to be coming out making 270HP
- SEMA G6 GXP concept has a DOHC HF 3.6L V6 form the CTS putting out 275HP
- platformmate Saab 9-3 is said to be getting a Turbo DOHC 2.8L HF V6 ~275HP

 

2.8 Dohc Turbo.

Ahh, i like blowers and pushrods on v8's, but not on v6's. "turbo" just has a higher performance ring to it too. Not to mention, turbo's are easier to play with come mods. Better gains too. If GM wants to push/market this car to the enthusiasts (especially the import crowd), turbo and Dohc are the only ways to go.

Oh and AWD is a must have. Go EVO, Mazdaspeed6, Sti hunting. Don't bother offering a 275-285hp high performance version of the G6 if you're going to shackle it with FWD. Toss in a 6spd as well, and a sticker price south of 30k.

 

Yeah, what he said

 

if the monte carlo is super charged, then wouldn't eat be easier to use that?

 

300+HP 3V Turbo 3.9L

 

The 3.6 VVT HFV6. Its already out, and we dont have to wait 5 more years for development of a supercharged version of an engine that isnt even in production yet.
A turbo 2.8 would be good, but Id rather take a 3.6. 275hp would put it far ahead of the Altima, Accord, Camry,...hell, anything.
GM NA has shown very little love for the turbo recently. A 3.6 would be just fine and be perfect mated to a 6spd manual or auto with manumatic option. That with a few tweeks would make the G6 the best car in its class.

 

The Turbo 2.8 with a 6 speed manual and AWD would be the choice for me . I would be absolutely shocked to the ground if GM actually did that though . What GM will most likely use is the 3.6 VVT engine though , and for what its probably gonna sticker for thats a wise choice . A $30K(assuming) G6 is gonna need it to be taken seriously as well as the 6-speed manual , and 5/6 speed auto .

 

The more I think about it, I think the Turbo 2.8L would be the best choice. S/C 3.5L 2nd choice. Forced induction is a must, as is AWD and a sub $30K price.

Since the turbo 2.8L is already going into the Saab 9-3 all the R&D on the engine and fitting that engein in that platform is already done.

If GM wants the G6 GXP to be a smash hit it is going to either need AWD or come in at $5,000 under the AWD Mazda 6 MazdaSpeed & SVT Ford Fusion.

 

I'd like to see GM throw some turbos at the market, besides Saab.

 

That would be too go to be true. I did vote for the turbo 2.8L, but GM probably won't do something that would generate a little more excitement about an already really neat car. I expect another half-a$$ effort from the General once more. The turbo Colorado SS needs to happen too.

 

Id say in this just use the high output NA motor to keep costs down. Because most of the people that have one of these cars arent going to be modding them anyway. If its peppy factory thats fine.

For the record, I would LOVE to see GM put out a similaly proportioned car with a turbo V6. However I dont want to waste a turbo motor on a FWD car. If the G6 were RWD or AWD then I would have definetely voted for the turbo motor.

 

Pontiac (and GM too) really needs to get out of this "pushrods are good enough for the masses" mentality. Like it or not, the end does not justify the means when it comes to consumer perception and regardless of how smooth and powerful GM makes its OHV engines, it's going to be derided by the press and wannabe enthusiasts alike. Even if Joe Paycheque doesn't know the difference between OHV and OHC, he's going to read reports where supposed experts say OHV is old and low tech, and that's going to influence his purchase.

So my vote is 2.8 turbocharged. Such an engine can easily net enough power to blow away the competition, and can be easily tuned to make more power which is vital to gaining an aftermarket following.

 

OHV are as smooth as OHC engines. If you want to read about how great OHC engines are, go ahead.
I know that OHV engines are smaller and lighter, more fuel efficent, and can make equal power to a similar OHC engine.

But I do think that the 3.6 VVT V6 making 275 will make its way under the hood, and we will see it this year at SEMA.

 

I don't know. Is there a streetable pushrod 2.0L 4cyl that'll make 240 horses or anything over 200 for that matter? I'm no tech-head, but as far as power, OHC has to have some sort of advantage with them supposedly flowing better in the upper rpm’s. When talking of smaller displacement engines making big (well relatively speaking) power, they're almost always high strung and that's probably why OHC might be better suited for them since high hp N/A smaller displacement engines are naturally peaky. On a 5.7+ v8 engine, that usually isn't an issue, because high output can be realized without having some outrageous redline.

I personally think a high performance N/A 4 or 6 is best matched with OHC as far as maximizing hp potential. But i agree with you on the size, low end tq, weight, and fuel efficiency.

 

That's because of more valves, not because of overhead cam.