I have a built b16 turbo (T3/T4 57trim .63 ar) I'm running 14,5 psi and it makes 320whp. I had this al done in a local shop here in the Netherlands a couple of months ago. But today i measured the size of my downpipe and it is 2,25 inch, the same as my charge pipe. And my pipe from turbo to IC is 2 inch. I know this is too small so i want to upgrade to a 3 inch downpipe and thicker IC piping. But will it make a lot of difference?




first at 10psi
second at 14,5psi

 

um yes

 

How much? 10whp or more like 50whp
Will this also be the reason that it spools real slow. Im at full boost(14,5psi) around 5500-6000rpm. What would be normal?


thanks Jose

 

yea that tiny downpipe is definantely holding you back

 

Yes,

For the exhaust (downpipe) 3" is the smallest diameter i would go with, Like they say "NO Exhaust" is the best exhaust for a turbo car...

As for the charge pipes, Most street applications use a 2.25" to a 2.5" IC piping.. I mean u can use 3" or even 4" IC piping but there are cars making 600+whp on just simple 2.5"..

Anyways, Good luck and have fun

 

10 bucks ur ss autoshit manifold cracks in under 4 months

changed to a manfiold im sure would give u a ton of more power, something with a better colletor
such as full race or love fab
but then agian they are bank to get

3 inch dp will give u a bit more power
why not just run a cutout on ur curent dp

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quad-Damge &raquo;</TD></TR><TR><TD CLASS="quote">10 bucks ur ss autoshit manifold cracks in under 4 months

changed to a manfiold im sure would give u a ton of more power, something with a better colletor
such as full race or love fab
but then agian they are bank to get

3 inch dp will give u a bit more power
why not just run a cutout on ur curent dp</TD></TR></TABLE>

LOL, I love it when people bash on a manifold because it looks like an SS Autochrome. That is NOT an SS Autochrome manifold. You can clearly tell by the collector...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Evil Empire &raquo;</TD></TR><TR><TD CLASS="quote">
Yes,

For the exhaust (downpipe) 3" is the smallest diameter i would go with, Like they say "NO Exhaust" is the best exhaust for a turbo car...

As for the charge pipes, Most street applications use a 2.25" to a 2.5" IC piping.. I mean u can use 3" or even 4" IC piping but there are cars making 600+whp on just simple 2.5"..

Anyways, Good luck and have fun </TD></TR></TABLE>

Without a downpipe, the turbo won't even spool up. On a turbo car, you definetly want to go with a 3 inch downpipe and 2.25 inch charge pipes are fine. My friend made over 650 WHP with 2.25 inch charge pipes.

 

Ok so i will get a 3 inch downpipe. But you say the charge pipe is ok. But how aboud the pipe from turbo to IC it now is 2inch????

and its no ss autocrome. It's dynamic autosports i was told

 

the 2 inch from turbo to IC is normal. People use smaller turbo to IC piping then IC to throttle because it speeds up the air flow to the IC then it slows down to the throttle body.. Leave that it's fine. Definately 3" DP though since you have no AC anyway!

 

but is that stil the case with a intercooler as big as i have????

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboSmart &raquo;</TD></TR><TR><TD CLASS="quote">

Without a downpipe, the turbo won't even spool up. </TD></TR></TABLE>

liar

 

So my intercooling piping is good??
(2" turbo-intercooler) (2,25"chargepipe)
And i only need to get a 3inch downpipe????

 

A 3" downpipe is more than enough for your situation, going bigger is only going to cause issues with bottoming out.

 

its like the difference between a .05 hooker and an 18yr old virgin.

 

your piping is fine, just change the downpipe to 3"
I dont think u will make anymore power if u go with bigger IC piping.

 

I am so coming to GA if you guys have $.05 hookers AND 18 yr old virgins to boot! ye haw!!!!

 

cool, then you can bring me my mani

 

just change the dp to 3" and u should be good unless they fucked ur ic pipping and pinched it i would check

 

ok so i will just only put on a 3 inch downpipe. What results can i aspect from going from a 2,25" downpipe to a 3"downpipe (in numbers please)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by goose21 &raquo;</TD></TR><TR><TD CLASS="quote">ok so i will just only put on a 3 inch downpipe. What results can i aspect from going from a 2,25" downpipe to a 3"downpipe (in numbers please)</TD></TR></TABLE>

Nobody can tell you for sure, but I'd expect 20-30 WHP and around 300-500 RPM's quicker spool, assuming you have a 3" catback and not a 2.25 incher to clog **** up.

 

I"m running open downpipe, so that should be ok

 

2.5in ic piping with 3in downpipe.

 

The downpipe will make a nice gain in HP, I dont think bigger IC pipes will give you over 5 hp