5" inlet on S400, use 4" or 5" intake?

G

getblown5.9

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How much will it affect the performance of my turbo if I use a 4" inlet on the air shut off and then use a reducer to go to 5"?

I have to make a 5" mitered elbow to make the tight turn off the front of the compressor to clear my alternator, then i was gonna put a reducers down to 4" so i can use my air shut off I built last year that uses 4" pipe.
 
i think the filter will be the biggest limit, the 4" tubing will out flow pretty much any filter you can find. i have 4" tubing stepped up to a 6" filter, its the only filter i found that will flow 1000+cfm with out a stupid amount of resistance.
 
Rollin Coal said:
i think the filter will be the biggest limit, the 4" tubing will out flow pretty much any filter you can find. i have 4" tubing stepped up to a 6" filter, its the only filter i found that will flow 1000+cfm with out a stupid amount of resistance.
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what brand filter?
 
its one of the new amsoil ones, im going by what they said for the flow rating's..... i should be taking the truck out for a spin tomorrow with the twins, well see if it works out any better than the "other" filter did.
 
i could prolly use all 5" piping and make it work on my shut off, but the filter is still just an AFE big cone style with 5" opening.
 
i have 4" tubing stepped up to a 6" filter, its the only filter i found that will flow 1000+cfm with out a stupid amount of resistance.
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did you calculate some equivalent surface area of the filter, or was there just some factory spec for flow? the question I pose is, why not a 4" filter flange with the same amount of surface area as the 6" (more or less I would bet). What are your base/top/length dimensions?
 
Hurley said:
did you calculate some equivalent surface area of the filter, or was there just some factory spec for flow? the question I pose is, why not a 4" filter flange with the same amount of surface area as the 6" (more or less I would bet). What are your base/top/length dimensions?
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it just happened to be the outlet size on the filter they said flowed that much.

the spec was 910cfm with 10in h2o compared to the filter i had which was 750cfm with 10.5in h20

if i remember the filter is 7.5/5/8 for the b/t/l measurements. seems small to me, but they said theyd send me a refund if i had any issues w/ it.

i ran it for a day or two w/ the single turbo, and it seems better, atleast it hasnt changed shape yet :hehe::hehe:
 
I run the AFE Mega Cannon or whatever the hell it's called...4" base with 4" tubing to my S400....no issues I can see...the fiter hasn't collapsed even with a sock over it for daily driving.

I haven't noticed any difference in boost at all with or without the filter sock.
 
I know the 4" inlet amsoil filters will try and suck themselves inside out.
 
amsoil makes about 30 different cone filters this one is supposedly something new..... time will tell.
 
I usea 4" inlet, but I use an odd shape filter. worksgreat, aem dry flo. huge amount of surface area, most I have found
its 9" long I think6.5tall and 10.5 wide
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it will be made so the filter can clamp to my air shut-off, and is easily removable.
 
I have seen some Amsoil filters suck in and kill hp on the dyno with willyb's truck I forget what size or type it was but it was def collapsing it.
 
I had an 8psi drop of boost with my 4510 amsoil filter. I would not recommend them especially on a large charger!
 
same with my 4510. I put a prefilter on to, even worse. Works good on small turbos though.
 
AFE and K&N have some fairly long filters... like 14-20"....although all I could think of was some twisted form of phallic symbol.



It would be good to find the pressure drop per square inch (equivalent or actual, whichever) of these filters and do a comparo test....but when it is all said and done, the biggest filter that can be crammed in will always be the best case
 
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