Are ALL GM Engines ok for all GM Model Cars?

[Nate_ERC]

Ty,

I don't claim to be an engine genius, but here's my thoughts.

The turbo is only going to make boost when under a load, so it only works at WOT. It's almost like it's either on or off. So if I'm running down the 1/4 that doesn't matter, because I'm going all out. But on the street or on the track, you will probably prefer some more partial throttle power. Another thing to consider is that on most setups the response seems a little sluggish. From my understanding this is because of all of the plumbing between the turbo and the intake. I'm not talking about turbo lag (because on a really dialed in setup it doesn't have to be there), this is actually an issue of how quickly the system responds to your input.

So I guess I'm just trying to say that your V6 idea would probably create more problems than it's worth. For something different it's kind of cool, but I don't think you could justify it performance wise. And like we all know, its SO EASY to make 500-700hp with an LSx, I don't know why any one would consider anything else.


I don't know the answers to your exhaust questions. I think V2s are usually so friggin' loud and deep because they have practically no exhaust. I don't think that piston size would be the biggest contributor to the "rumble" you are after. I've heard a lot of ford 300's with little to no exhaust, and they just don't have it.

You're probably aware of this already, but you won't be able to get your V6 to sound like a V8. Even if it's throaty, people will think it must have lost two cylinders.

[tyoneal]

Nate:

"You're probably aware of this already, but you won't be able to get your V6 to sound like a V8. Even if it's throaty, people will think it must have lost two cylinders."

I understand this, for the most part, but I'd bet $100 that a properly designed V6 could be made to have a throaty sound if a Two Cylinder V Twin Harley Can.

I bet it's the Size and Shape of the Piston, Cylinder and Cylinder head. I heard that Harley Patented the Harley, "Sound" several years ago when Jap bikes started going after the Harley Market Share.

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On another thought as far as Road Racing Engines go, there have been plenty six cylinder Turbo Road Racing Engines built and used successfully to win in Road Racing Application.

Didn't the "Can Am", some of the Lola's and the old, "GTU",(Grand Touring Under 2.5 Liters) racing class used turbo's. (I used to think the Pontiac GTO had something to do with the, "GTO", Grand Touring Over 2.5 liters) It may have been in name only. Who knows?

Let's not forget F1, last time I followed it you could either run a 3.0 N/A Engine or a 1.5 Turbo. Each one could put out 8-900 HP.

Anyway, thanks for the dialogue,

Ty

[trapin]

I work with a guy in my department that drag races a '69 Camaro utilizing a small block Ford. 8 seconds N/A.

[Nate_ERC]

Hey run whatever you want. A V6 turbo would definitely stand out in a crowd.

There's no doubt that it could be made as good as an LSx with the right amount of time and money. I would just stick to an LSx because are so damn easy (and light)!

If you mount an LSx down low and as far back as you can, you should be able to get real close to 50/50, and keep your CG low.

[ArisESQ]

if i'm not mistaken, there is a guy over at pro-touring.com who is building a 67 or 68 firebird with a twin turboed 3.8. i thought it was a pretty cool idea.

[DDY RCKT]

Much of the sound has to do way more with the firing order and the crank degree separation than with the size or number of cylinders. Most V6, I believe, have the rods separated on the crank in 60 degree steps, as opposed to american V8's that have them at 90 degrees. V12's, and some Foreigh V8's, run single plane cranks, putting the rods at 180 degree separation. Much of the burble and gutteral grunt is not the sound pulse as much as it is constructive and destructive sound wave interference patterns.

[DDY RCKT]

As for the turbo's, it's always a trade-off. The spool time is controlled by the size. So you can size a turbo to spool up really fast, not just at WOT, and get a decent amount of low end power. But the turbo will end up being the choke point up top, and you'll run out of power quickly.

Conversly you can size them larger, and the lag will be horrid, but up top you'll have gobs of power that you probably would be scared to use.

A third option is to go sequential turbo's, a smaller one for low end and to keep lag down, and a larger one to build that top end power. Think Supra TT.


On another note, consider what may be the ultimate production pro-touring car, the M3, and the fact that now they went with a V8, rather than their own twin turbo straight six...

[Nate_ERC]

If I was building a supercar, I'd use a variable inlet turbo. You can size it big, but it will spool similar to a smaller turbo. That's one of the I said that on a well dialed in setup, there is virtually no lag.

But no matter what kind of turbo you are running on a street setup, it's not going to make boost at idle, and it's going to make very little boost at part-throttle. It's only spooling when the engine is under a load.