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Forced Induction - V8 V8 Supercharger, turbo, nitrous discussions

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Old 09-23-2009, 12:21 AM   #1
BumbleDs
 
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LS3 vs LS9

I was told that the LS3 and the LS9 (minus the supercharger) are almost the same. I was told I wouldnt have to change anything (even injectors) by adding a supercharger. True, not true? Anyone know about this? Could I get the GM LS9 supercharger, drop her on and get a tune? Headers or cam differnace??
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Old 09-23-2009, 12:22 AM   #2
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No..its not as simple as getting the LS9 supercharger and dropping it in it..Look up both engine specs and compare them...lol..im not going to do the work for ya..lol
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Old 09-23-2009, 12:49 AM   #3
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Simply - I think the easiest way to put this is about the only thing that's similar is the block casting. Shoot, even that's different (LS9 uses, what, 12mm bolts instead of the standard 11mm, or something.) There's probably one or two shared components, like the cam retainer and lifter retainers, lol; okay, maybe the oil pan gasket... Different heads, dry-sump oil, different flywheel, the whole reciprocating assembly is forged on an LS9, I think the plug wires are shorter even, more layers in the head gaskets, LS9 has forged main bearing caps, is pretty much blue-printed (well, maybe not balanced, but the block is assembled special), dual-mode fuel system, dual-disc clutch, Ti intake valves, cam is different, and way more.

It's really a different animal altogether There's no comparison, really.
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Old 09-23-2009, 12:55 AM   #4
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hm. that sucks. but all in all, would a GM supercharger for the 6.2 LS9 be complable with the 6.2 LS3?
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Old 09-23-2009, 01:20 AM   #5
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Yes and no. The LS9 can handle a lot more boost and horses due to it's forged internals. You could run about the same horses but one can handle the stresses much better. The LS9 is a very special motor.
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Old 09-23-2009, 01:27 AM   #6
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agreed, I researched it a little bit and the LS3 was just a based platform for it i guess. In reality, what supercharger would perform close or exceed that of an LS9, for around the same quality and price? Im assuming thats a bit much to ask.
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Old 09-23-2009, 01:29 AM   #7
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It's not the supercharger but building the rest of the engine up to support that level of boost from the supercharger. No matter what parts you use adding more than 200+ reliable horsepower is going to be serious work and expense. You might look at doing something closer the LSA, you'll be around 550 instead of 650 horses but the cost and effort will be more in line with what you were wanting.
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Old 09-23-2009, 01:37 AM   #8
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So either way the plant HAS to be removed-so rebuild it for the numbers matching aspect in the future, or wait untill I find a wreched V series Caddy or ZR1?
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Old 10-02-2009, 09:12 AM   #9
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No, you would not have to tear down to make numbers similar to the LSA motor. There have been a few folks out knocking down mid 500RWHP with the Magnacharger on the stock short block. Do some more research and you will see that it can be done. Picking up an LSA or LS9 mill through the salvage markets will still be pretty costly and you can accomplish what you are shooting for now and for less $.
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Old 10-02-2009, 10:27 AM   #10
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Quote:
Originally Posted by BumbleDs View Post
agreed, I researched it a little bit and the LS3 was just a based platform for it i guess. In reality, what supercharger would perform close or exceed that of an LS9, for around the same quality and price? Im assuming thats a bit much to ask.
You could put a blower on your stock LS3 and be ok and make very good numbers. However, the LS9 is has forged internals and is ready for you to turn the boost up, you won't be able to do that on the LS3 (at least not for too long). The LSA isn't much better, a little lower compression and a few other tidbits, but again, I'm not sure how much boost it could handle.

For 6 - 7 lbs, you should be just fine for a stock LS3 and make great numbers. If you are looking to put in a lot of boost and make some BIG numbers, go fully forged and low compression .. skys the limit then

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