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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

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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??

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.

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. :)

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.

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.

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