What do you guys think is a good size pipe before and after the IC? 2.5in throughout? 2.25before/2.5after?

 

2" charge pipe and 2.25" to TB

 

Me to

 

What would be the disadvantage of going from 2.5in after the IC and also before it.

 

a little more power from 1,000-3,000rpm's just before your turbo spool up

Because u got little more air volume to suck in right before u get psi from your turbo setup

And it can give some more lag to
but that all matter what size turbo u got

 

bigger piping = more volume
small piping = higher pressure
of course if your running real high boost then 2.25 then 2.5 might help, all depends on your setup.

 

Thx guys!

 

What about 15-18psi?

 

The piping size doesn't need to increase based on higher boost; only if you increase flow volume - larger engine, higher revs would need larger pipes.

The DOWNside to large piping is it takes a little longer to build boost because the turbo has to pressurize the whole piping system before your engine sees any boost (got to wonder about those 36x18x4" intercoolers...)

 

How about 2 inch everywhere. Is that bad????

 

2in every where is ok drag turbo kits piping is 2inch every where

 

yeah, I think 2.25" piping to IC, then 2.5" to TB is probably the better combo, that's what I'm gonna do

 

2.5 from turbo to ic... 3 from ic to tb...

-tom (im on my friends account)

 

I've got 2" form my turbo outlet <2"> to my intercooler. outlet of my intercooler is 2" and I have it step up to a 2.5" to the throttlebody <JG O/B at 64mm>

That way my pipes are all as large as the outlet/inlets for maximum unimpared flow.

Just think about it, it makes sense. PLUS, my piping is so SHORT <MAXIMUM of 24 inches> I don't have to worry aobut spool time. I hit 10 PSI at 3500 RPM in second, short shifting 1st.

 

I'm in love with SiRkid's setup. That is just way too cool.

Honda engines don't flow enough to require 3" piping in my opinion; I think 2.5 is plenty big for even the highest power turbo hondas. I ran the numbers when I was designing my turbo and found that for a GSR consuming a full load of air at 8000 rpm, that as I increased size to 2.25" diameter the pressure drop of the piping went down significantly; from 2.25 on up to 3" diameter was a negligible difference so it really didn't justify the cost and increased air volume of the 3" piping.

 

Good explanation, sounds like good logic to me.