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Nis-ho
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Discussion Starter #1
Can anything be done to the intake manifold to improve flow for FI applications? you can polish and port it right?
 

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Nis-ho
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Discussion Starter #3
oh yeah, anything else???

btw, isnt extrude honing a bit costly?
 

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Nis-ho
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Discussion Starter #5
how long do the effects actually last?
 

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you can also switch to a bigger throttle body... and have the inlet port matched to the new tb... opens it up quite a lot... if you go with a 70 mm tb you gain 10 mm in area...

you can have the manifold gasket matched to the intake gasket... it helps with the flow a lot... that along with the bigger tb and you have corrected about 40 percent of the bad air flow paterns in the intake...

next thing that can be done is remove the secondairy butterflies in your intake... pull the intake and remove just the little metal plates... 2 philips head screws per plate... this in itself fixes most of the breathing problems in the intake manifold... with this mod expect harder starts in cold weather... less choke but it is worth it in the flow department... if you are good with a tig welder or know someone who is then remove the rod that runs the butterflys and have the holes welded shut... then the bar is not in there to cause turbulance in the air paths...
 

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Nis-ho
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556 Posts
Discussion Starter #8
somethingwicked said:
you can also switch to a bigger throttle body... and have the inlet port matched to the new tb... opens it up quite a lot... if you go with a 70 mm tb you gain 10 mm in area...

you can have the manifold gasket matched to the intake gasket... it helps with the flow a lot... that along with the bigger tb and you have corrected about 40 percent of the bad air flow paterns in the intake...

next thing that can be done is remove the secondairy butterflies in your intake... pull the intake and remove just the little metal plates... 2 philips head screws per plate... this in itself fixes most of the breathing problems in the intake manifold... with this mod expect harder starts in cold weather... less choke but it is worth it in the flow department... if you are good with a tig welder or know someone who is then remove the rod that runs the butterflys and have the holes welded shut... then the bar is not in there to cause turbulance in the air paths...
i'm definitely gonna have my friend bore out the tb, i dont know about the removal of the butterflies bc we do get nasty winters here in jersey, but definitely worth a look :thumbup:
 

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Nis-ho
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556 Posts
Discussion Starter #10
crappolla, that costs a shit load of $$$$$$$$$$ $600 :jawdrop:
 

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Nis-ho
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556 Posts
Discussion Starter #12
screw that, theres other ways to play
 

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Powered By hopes & dreams
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8,328 Posts
choose 2 of the 3:
fast, cheap, reliable.

you can be fast and reliable, but not cheap
fast and cheap, but not reliable
cheap and reliable, but not fast
 

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Nis-ho
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556 Posts
Discussion Starter #14
or i can just port the damn manifold, it would be hella cheaper, still reliable, and still quick
 

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Wise Cracker
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5,730 Posts
himbo said:
i'm definitely gonna have my friend bore out the tb, i dont know about the removal of the butterflies bc we do get nasty winters here in jersey, but definitely worth a look :thumbup:
There ARE NO secondary butterflies in our intake manifold. You can not worry about it and turbo the car first.... Honestly the turbo will more than tide you over, you won't miss the bored TB honest ;)
 

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Powered By hopes & dreams
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8,328 Posts
you can only port so much of the manifold due to restrictions of tool reach man. you'd only be porting the inlet/outlet but they have to be matched to the head and tb....so it's not gonna gain as much as you think.
 

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with the porting of the mainfold, youll gain a tiny bit of hp maybe 3-4 hp maybe. its more worth it with ported head and cams.
 

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Nis-ho
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Discussion Starter #18
thanks a bunch, i have come to expect that answer. :thumbup:
 
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