What size Charge pipes?
 

I know this has been covered, but the search isn't helpful. I am planning on running a Saab T3 48.42. with DSM450's on Uberdata. I currently have a D16Y7 with a Y8 intake. What size piping would be good at 6-7psi? I was planning on 2 inch.

Re:What size Charge pipes?
 

whatever your heart desires!

Re:What size Charge pipes?
 

im doing 2.5 inch but then again im shooting for 350-400 hp :-\

Re:What size Charge pipes?
 

2 is fine. 7psi sucks. :P

Re:What size Charge pipes?
 

Ok RENR, would 2 inch be good for 10 psi as well?

Re:What size Charge pipes?
 

a solid 2 inch setup will work fine for you, you're not going to any crazy level. I would have the exhaust at 2.5" cause there is no need for an overkill there either.

Keep in mind my figures are considering that you are using all mandrel bent piping (so the radius stays at 2 inches)

Re:What size Charge pipes?
 

I used 2.5" all the way, including the intercooler inlet/outlets. Seems to work fine for me.

Stan

Re:What size Charge pipes?
 

Also use the slightest bends possible.To many bends,especially if they are all 90's will cause resistance in flow.So if you can use 2 45's in place of a 90 it helps.Also the bigger the charge pipe and the longer the run,the more area has to be pressurized.This has to do with the size of your intercooler too.To big a chargepipe and intercooler will take longer to pressurize and equates to some lag in boost.

Re:What size Charge pipes?
 

I don't see how 2 45's will work better than a 90. Wouldn't 2 45's equal a 90? ???
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Re:What size Charge pipes?
 

I'm going to be running 2in from turbo to fmic then 2.5 in from fmic to tb running 9-10 psi. Don't know why i decided to do this. :P

Re:What size Charge pipes?
 

I just followed what my IC dimensions were. 2.25" in, 2.5" out. No point in running 3" to the IC, then have it pinched to 2.25".....

Re:What size Charge pipes?
 

True, that's why most people ( including myself recently) modify starion ICs b/c the inlets and outlets are only 1.5'' in and out.

Re:What size Charge pipes?
 

thats what i was thinking to

Re:What size Charge pipes?
 

If I were you, I would run 2" from turbo to IC, 2.25" from IC to throttle. Period. You don't need 2.50" or over for that low boost.

Re:What size Charge pipes?
 

Because the bend radius is larger with 2 45's than a 90.The idea is to make any bend as gradual as possible.You guys are thinking geometry,not so in pre bent piping.The over all radius is the key.

Re:What size Charge pipes?
 

If I were smarter I'd understand that. :o I guess that makes more sense to me now. I don't know how much that would really affect air flow or performance though. :-\ Mayeb if we were pushing like 400whp and every little tiny bit helped? ???
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Re:What size Charge pipes?
 

yeah but the air is gonna have to go throught two bends if its 2 45's,but if its one 90 it only has to go through one ;D

J/K ur probably right for sum reason that i cant comprehend yet...

Re:What size Charge pipes?
 

Mandrel bent piping.

Why would you use a flat 90 degree bend? I'm trying to understand.

Re:What size Charge pipes?
 

It is a universal effect.Doesn't matter what horsepower u have.Its like turboingyour car and leaving on the stock exhaust.Restriction is restriction.All this info comes out of Corky Bell's book"Maximum Boost".It's all about efficiency.Why make the turbo work harder than it has to.If you do then you just get more heat not power

Re:What size Charge pipes?
 

Ok, but how much loss would you really be getting from that? Not enough to even think about. :-\
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Re:What size Charge pipes?
 

True it is alittle ----,but the losses will depend on your set up(how many bends total).Its the small things like getting the intercooler and chargepipe size and stuff like the bends that in the end are going to make your set up more efficient and responsive.All that stuff is free.Its the same as getting to big or to small a turbo for your ride.Yeah it works but if you would have put more thought into it you would be alittle happier with the results :)