[FourDoorV]

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)

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

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

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.

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

 

[loweredd]

Nice! Did your Sniper fit OK? I haven't put my hood in yet, but it looks close.

Hurry and get us some #s.

 

[FourDoorV]

Nice! Did your Sniper fit OK? I haven't put my hood in yet, but it looks close.

Hurry and get us some #s.

Yeah it fit great. Miles of clearence between the Intake and the factory strut bar

 

[loweredd]

Good deal. I was worried about up at the throttle body. It's pretty high above the fenders.

 

[FourDoorV]

Pretty much everything is a very tight fit in these cars. Makes me miss my old truck a little lol

 

[random84]

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

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[FourDoorV]

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

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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

 

[Blades1_99]

What are you going to do for traction?

 

[FourDoorV]

28 inch ET street SS's in the rear on forgestar f14s. Switched back to stock rear springs. That's pretty much it. I think just being turbo will make traction much better on the street compared to the lsa blower where boost came in immediately

 

[random84]

Traction?

Pssshhhh!

Traction is for pussies!

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[CTS_Kenny]

WOW! I don’t know shit about rebuilding engines, but that looks like a bad ass MFr!! Nice work and impressive!

 

[random84]

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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[Vwlove56]

Dang Son!! That’s sweet.

Just curious- what pistons, and ring gap? Total seal rings?

Definitely capable of 900 but longevity?


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[FourDoorV]

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.

 

[FourDoorV]

Dang Son!! That’s sweet.

Just curious- what pistons, and ring gap? Total seal rings?

Definitely capable of 900 but longevity?


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Off the shelf summit Pro LS piston/rod combo with their rings. End gap is .028 top .030 bottom. I'd rather too loose then too tight.

 

[BigwormV]

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

 

[random84]

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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[FourDoorV]

Started street tuning the car this past weekend. Only on around 8 lbs (and way too rich on this pull) but definently making some power

 

[random84]

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[FourDoorV]

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Your car has a 2650 right? How do you like it?