Turbo log manifold for a silverado - LS1TECH - Camaro and Firebird Forum Discussion



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Turbo log manifold for a silverado

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Old 12-05-2017, 10:57 PM   #1
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Default Turbo log manifold for a silverado

Hey I am thinking of building a diff setup for my truck. I currently have a fully divided 2.5" truck manifold forward hotside. Spool time currently is not the best. Underhood temps are pretty bad, and I'm tired of fighting piping etc. when reinstalling the kit.

So, my next step is to try my luck at building a turbo log manifold setup. I am planning on ordering all the parts in sch40 mild steel.

As for the header primary tube size I'm thinking of 1.5"
Log manifold main body 2.5"
Crossover 2" or 2.25"

This will all be going into a t6 s480 turbo. My questions are do u think the the sizes for the manifold will work ok? will 2.5" main log body work or should that be 3"? Maybe a lil bigger for crossover size?
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Old 12-06-2017, 07:32 AM   #2
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I would get the new Holley log set up.

https://images.holley.com/8510hkr_v1.jpg
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Old 12-06-2017, 07:41 AM   #3
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listed sizes are good. i wouldnt go bigger.
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Old 12-06-2017, 09:42 AM   #4
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I’m interested in how much you’d have in it compared to a kbracing manifold.
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Old 12-06-2017, 11:47 AM   #5
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Well i priced it out and its around $200 in parts to build. Crossover another $120. Doesnt cost much. I got a mig welder and plasma cutter so shouldnt be to hard lol. Besides i like fab work.
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Old 12-06-2017, 11:51 AM   #6
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Quote:
Originally Posted by svslow View Post
I would get the new Holley log set up.

https://images.holley.com/8510hkr_v1.jpg
Not to big a fan of the holley setup. Want something simple tht works. Besides i dont run ac so i have plenty room to work with.
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Old 12-06-2017, 11:59 AM   #7
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How could it be more simple than the Holley log?
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Old 12-06-2017, 12:10 PM   #8
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I've build 100's of those logs. 2 1/2" crossover works well, 2 1/4" will give a tad faster spool time.
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Old 12-06-2017, 01:57 PM   #9
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Damn, that’s not bad. I’d build one for that price too. 1 exhaust manifold flange, 1 2.25 vband assembly, T4 flange, 2 2.5” 90’s,2.5” straight and 4 1.5” 45’s?
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Old 12-06-2017, 03:28 PM   #10
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KB log and make your own 2.25 crossover...
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Old 12-06-2017, 06:10 PM   #11
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well I'm shooting for the fastest spool time possible. This big s480 is crazy laggy with the 5.3, with the 6.0 it wasn't near as bad.

What about a 2" crossover? any hp to be sacrificed with it being that small? Just curious.

And I'm guessing the 2.5" is fine for the main body of the log manifold?
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Old 12-06-2017, 06:11 PM   #12
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Quote:
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KB log and make your own 2.25 crossover...
I would go that route but I just like fabbing stuff and making things work. I built my complete front mount setup 2 yrs ago.
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Old 12-06-2017, 06:14 PM   #13
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Originally Posted by 4EyedTurd1 View Post
Damn, thats not bad. Id build one for that price too. 1 exhaust manifold flange, 1 2.25 vband assembly, T4 flange, 2 2.5 90s,2.5 straight and 4 1.5 45s?
Yea that seems to be about right. Same parts list I came up with.
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Old 12-06-2017, 08:58 PM   #14
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At what rpm do you start making boost Brandon?
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Old 12-06-2017, 10:34 PM   #15
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I wanna say around 3600-3800 rpm. Don't have a log to look over.
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Old 12-07-2017, 12:34 AM   #16
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The kit I am currently running used primary tubes with ID of 1.5" and the manifold outlets are 1.875 (yup 1 7/8"). That's how the kit came. Spools lighthtning fast with a 7675 and 6.2L (0-8psi in 0.7 sec according to my logs), I have made 818rwhp @16psi with burnt plug wires. Should be close to 900rwhp if I could keep spark.

if I were building a new kit the primary tubes would be be 1.75" and 2.25 or 2.5" log based on my cubes and turbo.

for you, I think 1.5" and 2" is a good compromise.
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Old 12-07-2017, 03:43 AM   #17
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Where are you sourcing your material? I might build one for that orice
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Old 12-07-2017, 09:32 AM   #18
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Ace race parts and columbia mandrel bends.

I got to thinking last night for what it costs and the time involved to make these, kbracing is pretty decent on price. Not a bad idea to just buy one.
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Old 12-07-2017, 09:51 AM   #19
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Has anyone tried using a 3" sch. 40 for the log.
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Old 12-07-2017, 12:14 PM   #20
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Quote:
Originally Posted by Hammerhead77 View Post
Has anyone tried using a 3" sch. 40 for the log.
I built a couple back in the day for some big horsepower guys and T6. I really don't think it's necessary or helpful for anything less than 1200hp
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