Fitting S4 NA fuel rail on S5 NA intake manifold?
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Joined: Jul 2002
Posts: 3,219
Likes: 8
From: Washington State
Fitting S4 NA fuel rail on S5 NA intake manifold?
I'm building up an NA-EFI setup and wanted to avoid turning my awesome new build into a barbeque pit, so I got some uber sweet polished S4 fuel rails with the pulsation dampeners removed. The trick here is I've got an S5 intake that they're going on.
The mounting points for the S5 rail are lower and further apart than the S4, but injector spacing seems identical. Seems like with a bracket this should work.
Has anyone fabbed up a bracket for this, or know of a source for one? The rest of the setup is super clean, would like to keep in that tradition with a nice bracket versus something ghetto-rigged on.

pic of fuel rails, S5 on bottom, S4 on top. (Note: it looks like the injector holes are diff, but you can lay them directly over each other and they align perfectly)
The mounting points for the S5 rail are lower and further apart than the S4, but injector spacing seems identical. Seems like with a bracket this should work.
Has anyone fabbed up a bracket for this, or know of a source for one? The rest of the setup is super clean, would like to keep in that tradition with a nice bracket versus something ghetto-rigged on.

pic of fuel rails, S5 on bottom, S4 on top. (Note: it looks like the injector holes are diff, but you can lay them directly over each other and they align perfectly)
FFE makes the cleanest rails that I have seen.
Full Function Engineering | FFE Store
Full Function Engineering | FFE Store
Joined: Sep 2005
Posts: 25,581
Likes: 136
From: Smiths Falls.(near Ottawa!.Mapquest IT!)
go to FB and ask ERIC on his page.
Rising RPM - Home if he has Rails.I think you need to ask,as you are dealing with N/A and not TII rails.
Rising RPM - Home if he has Rails.I think you need to ask,as you are dealing with N/A and not TII rails.
Thread Starter
Joined: Jul 2002
Posts: 3,219
Likes: 8
From: Washington State
go to FB and ask ERIC on his page.
Rising RPM - Home if he has Rails.I think you need to ask,as you are dealing with N/A and not TII rails.
Rising RPM - Home if he has Rails.I think you need to ask,as you are dealing with N/A and not TII rails.
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