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Discussion Starter · #1 ·
I've been lurking on the forum for a couple months. Been following a lot of the build threads closely and decided I'll make one of my own. I'm just finishing up the build now but I've got a lot of tuning/testing to do still and I have pics documenting most of it along the way.

2012 CTS-V
Summit Pro LS piston/rods with stock crank
BTR stage 2 twin turbo cam
Huron Speed twin 6467s
VS Racing wastegates and BOV
Creative Steel motor mounts
DSX aux pump with fuel injector clinic 1300s
DSX flex fuel sensor
Lots of other small things I'm forgetting

Hoping to make around 900 on E (5 second 60-130 range)

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Beginning of August, car was still together with a pump gas/upper pulley only LSA set up. Fun for what it was but I took it out and got bullied by turbo coyotes and boosted vettes and decided the next day it was coming apart.

August 2nd 2021 I started tearing down the lsa set up
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Sent the rotating assembly to the machine shop to have it balanced and then slowly put the motor together in the garage. There was some more clean up done on the motor before assembly but I dont have pictures of that



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October 2nd motor was back in the car, went to Las Vegas for a week after that though so it sat until I got back.


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October 30th fired it up for the first time. Not sure how to post videos on here though??


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900 on E isn't very aggressive for turbos. I think you'll hit that easily!

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What are you going to do for traction?
 
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Traction?

Pssshhhh!

Traction is for pussies!

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Yeah I hope so. I see a lot of you guys making almost 20 lbs of boost on 427s, I'm not trying to make big power like that. Atleast for now lol
So after admiring your build photos, I realize you're still on the LSA block. Because those cylinder walls look soooo thin.

You might want to stay on the conservative side for sure. 750-800 rwhp max seems to be a good rule of thumb for any kind of durability with aluminum 4 bolt blocks- and that's assuming it's mostly a street car.



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Discussion Starter · #14 ·
So after admiring your build photos, I realize you're still on the LSA block. Because those cylinder walls look soooo thin.

You might want to stay on the conservative side for sure. 750-800 rwhp max seems to be a good rule of thumb for any kind of durability with aluminum 4 bolt blocks- and that's assuming it's mostly a street car.



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I am hoping the occasional night of racing on the 900ish hp level will hold up for awhile. Day to day I will keep it around 12 lbs of boost which would probably be 650 ish?? I know there is a risk for sure with a 4 bolt block (aluminum block at that), but I think it will be okay. LS3 corvette guys make pretty big power on stock blocks.
 

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Build looks sick! From what I’ve read the lsa is cast differently and built better for boost vs the ls3. The limit from what I’ve seen on 4 bolt heads is between 25-30psi. Some get away with more and some with less. Our sleeves are probably the weak point in the block. I just finished my twin turbo build myself and am going to start on testing and tuning this week hopefully if I can find the time. I believe a guy I know is running 15* of timing and like 12psi on the mostly stock fuel system and made like 900
 

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I don't think 25+ psi boost and 4-bolt heads are used in the same sentence... for very long.

Couple of guys would lift heads around 900 rwhp from what I remember - but always variables depending on power adders, timing, etc.

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