slippi84

iTrader: (4)

I'm doing my homework in preparation for turbo setup for my LSX 454 setup. Couple things I know that are against me. The LSX 454 crate motor has 11:1 compression and not a good reputation for big boost. The guy that is all over the net trashing GM and the block saying his motor only lasted minutes on the dyno is of course at the front of my mind, but if you go to his original build thread on the camaro forum he had a whole dyno session at 16psi then tried to up the wick after upgrading his fuel setup and the motor went. I think that this motor like any other stock motor with higher compression not designed for boost at a conservative 6-8psi can make 100-150 more whp given the right turbo. Which brings me to my question how big of a turbo and hotside would I need to run to increase the flow for a motor this big at only 8psi. My thoughts were a S475 with a t6 1.01 hotside at 8psi would be a great setup and still spool fast enough to enjoy.

TheLS1Lover

Why not just buy the LSX block, have a good shop (VA Speed, AES, LME, etc.) build it for you? And go with less than a 4.185" bore? Say a 440CI?

WheelsUp84z

iTrader: (14)

better off having someone build you a motor instead of the crate motor, its not nearly optimized for boost. And that s400 will be kind of small for that many cubes esp with a 1.01 A/R. Its only 75mm.

89ROC-Z

iTrader: (11)

I've heard that block has too thin of walls for any kind of boost. And BTW, people run that s475 on 5.3's all the time

123quattro

I wouldn't put boost on that engine, ever.

1fast bird

iTrader: (22)

Not positive, but I think he already has the 454 by what he said?

My advice would be to sell it and get a purpose built boost motor. Just not worth hurting a good N/A crate motor that costs as much as they do. Only takes a bad tank of fuel or a bad tune to detonate and ruin a perfectly fine block. Even with only 8 psi it could happen easily..... Plus don't limit yourself to that little of boost, because you will eventually want more.....That's part of this disease we all have to go faster.

slippi84

iTrader: (4)

Motor is already purchasef and installed so the sell it idea throw that out the window. My questiin again is will a S475 flow enough at only 8psi max to make atleast another 100whp on a lsx 454 motor? If not which turbo would? Only other optiin boost wise I could think of would be a whipple 3.3 or 3.8 but they are a tad tall.

123quattro

Maybe something like a GT4708? 8 psi on something that big is going to make a lot of power, way more than 100whp extra. 6psi on a LS3 can add 200whp.

I would definitely run it on E85.

LS6427

iTrader: (2)

Why would you want 454 cubes for forced induction anyway........way too much.

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BOBS99SS

iTrader: (2)

You have the wrong motor, didn't you plan for future mods, if your going to drop that much on a motor you think you would plan ahead a lil, I would love a 454lsx but if I had boost on my mind that's the last motor I would pick, but hey if you hell bent on boost see what happens,

BOBS99SS

iTrader: (2)

Yeah I just see starting with something built to handle boost would be a much better route, unless you want close to a 10grand paper weight

Hank Peabody

iTrader: (2)

I had a standard S400 75mm on a 454ho big block and it worked pretty good on the street, added alot of power with only 10psi, but that is a low rpm engine. Put an S480 on it and run low boost and you'll like the added power.

slippi84

iTrader: (4)

Hell if I can get a turbo that will make 100-150whpat only 6psi that's would be great but I think that 8psi is where I'll need to be at. As of now I'm leaning toward a s475 with big t4 hotside.

1fast bird

iTrader: (22)

T4? Might want a t6 with a 1.32 turbine housing with that motor.

slippi84

iTrader: (4)

That's what I was thinking but not sure if I can fit something that big in my engine bay this is in a AWD trailblazer SS. My downpipe size is limited so I have to check for spacing to see what I can get away with.

1fast bird

iTrader: (22)

Get a reducer to fit the downpipe you need. Just don't want to go from 5" down to 3". Just don't use a t4 flange turbo to fit a downpipe, especially with your cubes. Probably be better off using a s480 or even a GT88-91 turbo with that motor.

slippi84

iTrader: (4)

Those are some big *** turbos though my goal isn't just peak hp that's for dyno queens I want useable everyday power. This TBSS isn't really even gonna be a big track car but I just want a little more and to be able to run 10's if I do go to the track

1fast bird

iTrader: (22)

You mentioned the s475. Though I never compared them, I'm pretty sure the s475 and s480 are physically the same size.

93formto98T/A

iTrader: (28)

Way too much? Nah, I went 463ci but did it the right way with a Tall deck block to keep specs within safe parameters. This is on a 106mm. Street car.

slippi84

iTrader: (4)

I understand that you had a boost built motor but that doesnt make boosting this motor the wrong way. There are tons of companys that make turbo kits for high compression non turbo friendly stock setups with weak internals. The key is knowing your limit. Not to mention my internals are all forged and I can use alky as a saftey net.