Stepping down to 4 inch intake on s400

fordcummins1992

fordcummins1992

boost guy
Joined
Jul 25, 2009
Messages
305
Is there any downside to stepping down a section of pipe to 4 inch for an intake on a 351/s475 compound setup I'm limited clearance

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fordcummins1992 said:
Is there any downside to stepping down a section of pipe to 4 inch for an intake on a 351/s475 compound setup I'm limited clearance

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Click to expand...

On my compounds I feed my 472sxe with a 488sxe using 3.5" tube for interstage pipe. No problems at all.
 
Vincejax said:
On my compounds I feed my 472sxe with a 488sxe using 3.5" tube for interstage pipe. No problems at all.
Click to expand...

What sized filter?

From my experience with a FI 488 ETR with V2 as my primary it needs minimal restriction. Running a 5.5"-6" elbow to a 6" tube with an AFE pro dry 6b x 8w x 12l filter I saw a 12-15si gain just by removing a prefilter sleeve.

I couldn't imagine reducing to a 3.5.
 
blackmega3500 said:
What sized filter?

From my experience with a FI 488 ETR with V2 as my primary it needs minimal restriction. Running a 5.5"-6" elbow to a 6" tube with an AFE pro dry 6b x 8w x 12l filter I saw a 12-15si gain just by removing a prefilter sleeve.

I couldn't imagine reducing to a 3.5.
Click to expand...
10" Velocity stack on primary compressor inlet. 488sxe only has a 3.5" compressor outlet, I run 3.5" interstage pipe then step up to 5.5" compressor inlet on my 472 manifold turbo with a 4" long concentric reducer. The 3.5" interstage pipe isn't a restriction because the 488 compressor outlet is only 3.5".
 
Vincejax said:
10" Velocity stack on primary compressor inlet. 488sxe only has a 3.5" compressor outlet, I run 3.5" interstage pipe then step up to 5.5" compressor inlet on my 472 manifold turbo with a 4" long concentric reducer. The 3.5" interstage pipe isn't a restriction because the 488 compressor outlet is only 3.5".
Click to expand...

He's talking about the inlet piping going into the primary, that the air filter is on.
 
Let's not reinvent the wheel. It is a pretty simple setup making normal power. Nothing exotic. You are fine OP.
 
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