Intake Size For New Turbo

[Jayden.K]

im installing a 3076r on my r34 and the intake pipe i have is a 3 inch, but i have a 4 inch anti surge housing on my turbo, so question is can i get away with a 3 to 4'' silicone adaptor at the turbo or will this be to restrictive having a 3 inch pipe coming to the turbo?? this is instead getting a new custom 4'' pipe to save a bit of time and money. but then i will have the reducer and the afm with the 4'' pipe (z32 has a 3'' housing).

[JordansR32]

From what i have read/heard about this just keep to intake pipe same size as the outlet, but i guess like u said u run into drams with the afm and stuff, so i cant see why you couldnt do that, maybe if ur chasing big power down the track that could be an issue, than again u could go to a map sensor ecu, and not have to run a afm!

[R31Nismoid]

3" will be fine.

[Jayden.K]

Cool thanks I'm not worried about the Afm just the air flow up to the turbo being different maybe causing some dramas, the extra inch is pretty much the surge slots so all I was worried about was them not being utilised.

[discopotato03]

The compressors inlet diametre from memory is 57mm (2 1/4") and the only reason the compressor housings boss is 100mm (4") is for the ported shroud .

The Z32 is 80mm (3 1/8 OD) and internally is the smallest part of the inlet plumbing . I doubt its bore size is any larger than 76mm (3") so using 4" pipe wouldn't gain any flow only volume .

A .

[R31Nismoid]

Cool thanks I'm not worried about the Afm just the air flow up to the turbo being different maybe causing some dramas, the extra inch is pretty much the surge slots so all I was worried about was them not being utilised.

AFM needs to be AS FAR away as possible from the intake, and it'll be fine.

[AngryRB]

im installing a 3076r on my r34 and the intake pipe i have is a 3 inch, but i have a 4 inch anti surge housing on my turbo, so question is can i get away with a 3 to 4'' silicone adaptor at the turbo or will this be to restrictive having a 3 inch pipe coming to the turbo?? this is instead getting a new custom 4'' pipe to save a bit of time and money. but then i will have the reducer and the afm with the 4'' pipe (z32 has a 3'' housing).

I went 4inch because it looks better and hopefully lets the turbo breath better,

if the dump is bigger than the turbine, shouldnt the intake be bigger than the compressor for max hp?

Edited February 13, 2013 by AngryRBGTX

[scotty nm35]

Going 4 inch is only going to improve flow if you have no AFM, otherwise it's pointless.

If 4 inch looks better, perhaps you should have gone 6 inch, omg that would look hektic.

[Jayden.K]

I think the point is that I wont gain or improve anything buy going 4inch as the turbo doesn't need that space to do its job and the impeller itself isnt that big. The Turbo is low mount so it was going to be squishy with a 4inch. But I'll stick with my 3 inch pipe and use the reducer at the turbo. Thanks for all the input

[matt3]

Tight but can be done ?

[89CAL]

Wooooooooow

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