Fmic Piping, Does Size Matter?

[ClutchBurndout-:(]

hey guys, please note this is a question about the PIPING for the fmic, not the cooler itself. id just like to know if the piping for the fmic size matters? on a stock setup. or the bigger the cooler piping to the TB the better?

cheers

[zebra]

the standard 2.5" is fine for over 300kws, any more I would be looking at 3"

[ClutchBurndout-:(]

the standard 2.5" is fine for over 300kws, any more I would be looking at 3"

i think it might be around 2 inch :S to small?

[zebra]

r33 gtst is 2.5" well near enough being that the japanese use metric.

[mad082]

bigger piping = more flow but less repsonse, because it takes longer to fill up the piping.

[Munkyb0y]

i think standard is 2.25 till the crossover pipe, which is 2.5 to TB.

[zebra]

def 2.5"

i still have some standard piping on my car, hooked up with 2.5" silicone joiners

[ClutchBurndout-:(]

this isnt standard piping, its standard to the turbo etc, but both sides of the fmic are small.

anyway, more response for smaller piping... i can live with that haha

[Munkyb0y]

def 2.5"

i still have some standard piping on my car, hooked up with 2.5" silicone joiners

actually you might be right

i think i was getting it confused with my fmic piping, which is 2.25.

[ARTZ]

the standard 2.5" is fine for over 300kws, any more I would be looking at 3"

Is that wheel or engine ??

[TiTAN]

the biggest restriction isnt the cooler pipes but the intercooler itself.

[kylegtr]

isnt it the bigger the piping the more air needs to be in there so more lag, depending on your mortor/turbo setup of course

[zebra]

Is that wheel or engine ??

rwkw

[bubba]

No need to have piping larger than your throttlebody as the throttlebody is then going to be a restriction... i.e. stock t/b is what? 63mm? that's 2.5"..

That being said, is there any reason to have piping larger than your turbo outlet??

[r33_racer]

I think this is covered in corky bells turbocharged book. Well it must be since its covered in the supercharger book also.

Its worth grabbing since it gives you the formulas for working out this kind of stuff. Very informative!

Bubba is right though, only upgrade size if its needed and if your doing from turbo exit to tb.

[bubba]

I think I need to find me a copy of said book

[lotsalag]

think about the volume of air a turbo pumps under boost, honestly i cant see an extra half inch of piping will make a noticeable difference to response.

bigger pipes equals more (noticable)lag is a myth as far as im concerned.

ive been told by someone who should know that the bigger the better full stop!

not saying its the rule just relaying what ive been told and understand.

besides restrictions stack up/add up over distance, so yes if ur cooler piping was the size or turbo outlet u would have one hell of a restrictive system.

anyway, not starting an argument, cos i know there r plenty who will disagree with me, just my opinion.

[bubba]

I would think that having smaller piping from cooler to throttlebody than from turbo to cooler, would help maintain velocity after the small pressure drop from the cooler.. having piping larger than your throttlebody would be pointless though and having piping smaller than your throttlebody would be restrictive.

[JonnoHR31]

I think I need to find me a copy of said book

have it here somewhere if you wanna borrow it

ideally the first bit of cooler pipe off the turbo would be a conical shape and get bigger at the same rate as the compressor outlet until you reach whatever size you need.

[mickey]

what is more important for response/lag is having shorter/less piping. Keep the snake short.