LS1 with two GT2871s
#1
Instructor
Thread Starter
LS1 with two GT2871s
Thought I would post some pics for reference. Running a Silverado manifold on the left side, made my own adapter. Looked at putting it high behind the wheel, but too much tube and bracing from the engine.
#2
Instructor
Thread Starter
LS1 twin gt2871s
Here's the right side, waste gate is not installed yet. Using an F-body double wall steel manifold.
The L bracket is just there to hold it up. Will require bracing from the engine.
The L bracket is just there to hold it up. Will require bracing from the engine.
Last edited by squared; 09-28-2019 at 05:54 PM. Reason: autocorrect
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Metalhead140 (09-29-2019)
#3
Burning Brakes
get your tube of Vaseline and shoehorn out. C3 is a tight platform. Been there.
You'll need a scavenge pump for the lower turbo.
Looking forward to progress.
You'll need a scavenge pump for the lower turbo.
Looking forward to progress.
#4
Instructor
Thread Starter
updated mounting
Turbos were hanging too low, so I cut the flange off the truck manifold on the left side. Welded a T25 flange on, which raises it significantly, and puts it above the oil level in the pan.
#5
Burning Brakes
I like that alot better.
I'm confused. I see an external wastegate in one photo and an internal in another. what's the story?
I'm confused. I see an external wastegate in one photo and an internal in another. what's the story?
Last edited by DblTrbl; 10-27-2019 at 01:03 PM.
#6
Instructor
Thread Starter
waste gate
The turbo has an internal waste gate, was planning using externals.
I'm debating whether to drill a hole in the manifold and weld in a sched 40 pipe for an external, or just run it with the internal and see what the pressure inside the manifold is and if I get boost creep.
I'm debating whether to drill a hole in the manifold and weld in a sched 40 pipe for an external, or just run it with the internal and see what the pressure inside the manifold is and if I get boost creep.
#8
Race Director
0% chance of using these, but the layout may provide food for thought... https://www.mniboats.com/exhaust-man...iABEgIDTPD_BwE
Last edited by derekderek; 10-28-2019 at 06:13 AM.
#9
Instructor
Thread Starter
That's funny.... I've got a set of these in my storage shed from the 4.8 I put in my Wellcraft a few years back. They're cheap, much cheaper than any marine manifold that fits an LS. I opted to go with aluminum manifolds and risers from Marine Power at $1400.
I had the same thought... "why don't I just try to adapt those pleasurecraft marine manifolds?" They're cast iron and weigh a ton, easily twice what a cast manifold from a Silverado weighs. They do look like they would flow well. I'm not sure how the heat from a Turbo installation would affect them, since they're designed for cooling water. You might be able to vent them somehow. They're made to sit with the exhaust pointing up and mounting them upside down would be an issue.
I had the same thought... "why don't I just try to adapt those pleasurecraft marine manifolds?" They're cast iron and weigh a ton, easily twice what a cast manifold from a Silverado weighs. They do look like they would flow well. I'm not sure how the heat from a Turbo installation would affect them, since they're designed for cooling water. You might be able to vent them somehow. They're made to sit with the exhaust pointing up and mounting them upside down would be an issue.