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Old 10-13-2008, 10:18 PM   #1
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Here is one to spark discussion

WHat would you all prefer....

And what do you think would be more reliable over time?

1. A normally aspirated LS3, bored and stroked to 418c.i. All top of the line stuff, long tubes, goal of 600 rwhp or so.

2. A supercharged LS3, 408c.i. or stock c.i. built for boost with forged internals and crank. Build it and put say 10psi to it? Not sure what that HP would be, but maybe 750 or so...

What do you all think. I am working on a Group Purchase for a supercharger system, but could also do it for a normally aspirated set up....Just dont really know what to do!!!
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Old 10-13-2008, 10:22 PM   #2
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I've always had a preference for N/A but that's just me, it just seems more in depth to do N/A tunes. It just seems to easy to do forced induction, I mean with enough cash anything is possible with FI, but with na it's more of an art getting all that you can out of an engine.
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Old 10-13-2008, 10:25 PM   #3
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But what do you think would be the most reliable?

I would also think the N/A motor would be more fuel efficient....you are making the HP with less air since there is no forced induction.

I am considering building a motor next winter, or I would buy a blower this spring, and maybe forge the internals next winter.... Can't really decide, but I must say it would be SICK to put down over 600 at the rear all motor!!!
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Old 10-13-2008, 10:26 PM   #4
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on 10psi with a supercharger it would be real hard to get 750 hp, with a turbo maybe with amazing tuning that would be possible. I think really though there is no wrong way to go, im looking at an APS twin turbo




thats on stock internals which after a while i will replace with forged goodies. but it shows the potential of the stock motor with a "little" boost.
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Old 10-13-2008, 10:27 PM   #5
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Talk to WMholden, he's probably one of the best guys on here in regards to forced induction. Send him a private message if he doesn't see this thread he seems pretty amicable so he should be very helpful.
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Old 10-13-2008, 11:46 PM   #6
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I'm thinking I'll do the Cam swap and get the engine to 480 and be done with it. Today they shot down my dreams of a factory LS7 :( I was really hoping for a 1 off VIN.
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Old 10-13-2008, 11:50 PM   #7
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Quote:
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I'm thinking I'll do the Cam swap and get the engine to 480 and be done with it. Today they shot down my dreams of a factory LS7 :( I was really hoping for a 1 off VIN.
lol sorry bro...
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Old 10-14-2008, 12:11 AM   #8
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The beauty of forced induction is that you can usually maintain decent fuel economy. A naturally aspirated motor with big displacement and high revs will send your fuel economy to crap and most likely make it more difficult to meet emissions. I don't even know if a FI car would meet those anyway.


As far as reliability goes, a built motor like that is likely going to be decently reliable. But with high hp applications, you're always going to be pushing the limits of reliability. And as much as I like driving naturally aspirated cars because of the linear torque curves, I would say for a daily driver, FI would be the way to go. If you want a lot of hp for the track and don't mind sacrificing drivability, go all motor.

Last edited by MajorTom; 10-14-2008 at 12:22 AM.
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Old 10-14-2008, 12:16 AM   #9
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[QUOTE=ZZcamaro;157303]But what do you think would be the most reliable?

I would also think the N/A motor would be more fuel efficient....you are making the HP with less air since there is no forced induction.

I am considering building a motor next winter, or I would buy a blower this spring, and maybe forge the internals next winter.... Can't really decide, but I must say it would be SICK to put down over 600 at the rear all motor[QUOTE]

Didn't see your post til after I posted mine.

No. A NA motor with big displacement and high hp would not be more fuel efficient. The motor is having to work harder to flow the same air. Which it would still have to flow lots of air to make good power. And modern superchargers are efficient at low rpm so there wouldn't be a lot of drag forcing your engine to work hard at low RPM.

Not to mention that the cam that would be needed to make 600 hp at the wheels would be rough and make your car idle really crappy and possibly not even make great power off the line.

Trust me. For high horsepower daily driven cars, FI is the way to go.
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Old 10-14-2008, 02:12 AM   #10
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All of the above are good points... but nothing says "get out of the way" like the sound of a SC.
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Old 10-14-2008, 09:06 AM   #11
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Quote:
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All of the above are good points... but nothing says "get out of the way" like the sound of a SC.
How about a jet turbine strapped to your Camaro?
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Old 10-14-2008, 09:12 AM   #12
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So it looks like you all suggest going for the supercharger...then building a good block for it over next winter?

I woudl think that should be very doable. I would build a block with all forged internals, the best rings I can get, ported heads, some type of headers....then I would up the boost. What compression ratio should I build for? 9:1 8.5:1?? At 10pse, what do you think my RWHP numbers could be?
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Old 10-14-2008, 09:24 AM   #13
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Ever since owning the 04 cobra .. I say build the engine and put some sort of boost to it ...

Maybe not the highest HP numbers, but a built LS3 w/ a KB Sitting on top would put out some NASTY torque I'm sure .... Just plain FUN.

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Old 10-14-2008, 09:26 AM   #14
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COme on give me some legit HP numbers you think that motor could do. I want this to be the ultimate daily driveable, untouchabe (for less than a ferrari!!) street monster!!
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