Will I notice a difference between 3" and 4" intercooler piping?
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Will I notice a difference between 3" and 4" intercooler piping? Like the title says, I want to run 4" charge piping from the intercooler to the intake. My intercooler is 4" in/out and I was jsut going to Vband the connections. the 4" will look alot better than the smaller 3". I was planning on just running the 3" stuff the very short distance from the turbo to the intercooler. What would going 4" over 3" do to me if anything?
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heres a question for a noob if your throttle body is 90mm which is 3.5" why would you go piping larger than throttle body and why would you go bigger piping then the intercooler inlet and outlet?
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From: Norn Iron
All fitting an excessively large TB will do, is reduce throttle resolution.
thank you thats a no brainer hell 6 and seven second cars arent running but 3.5 - 4" pipe right? i am going with a 105mm which is right at 4" i am doing a twin set up i will run 3 - 3.5" from cold of turbo then Y into 4" to cooler 4" to TB
On my setup, the turbo is 3" OD on the charge side. The intercooler is 3.5" in and out. The TB is a 4" (90mm). I decided to go 3" tubing to the intercooler with a 3" to 3.5" coupler. Then do 3.5" tubing to the TB with a 3.5" to 4" coupler.
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From: Savannah, TN
A 90 mm is 4 inch on the od not the id and a 105 is closer to the 4 inch ID . If you run a 4 inch up to a 90mm a 4 inch hose works perfect for a conection but the tb is smaller . I think that a larger pipe makes the car respond off boost better. I would run it if there is room.
I would go with 4" piping. It shouldn't hurt anything. I just dont like using too many reducer couplers. My chassis guy made my entire intercooler setup in 4" piping. It might be a little overkill for my baby F1C blower, but if I ever upgrade to a F2 it will be perfect.
correct 105mm is 4.13385.. with my kit (twin....to come) hot side 3.5 cold 4" and 5"DP all v banded, 1 7/8 primaries up and forward manifolds with individual egt bungs per cylinder big ATW intercooler with LSX 4xx pics and build in progress will update soon
This is a loaded question answer cant really be given. cause length of pipe/number of bends/ shape of bends/ the way the coupling fit to meet the pipe. All change the the flow amount.
In theory 3 inch pipe will flow the same cbf of air at 5 psi that it will at 20 psi the change is the density of the air flowing thought the pipe. Now the base atmospheric air cbf numbers are no long on the same plane as the 20 psi number unless you let the pipe fill a space (like a big room so it not compressed anymore )
But at this point it has nothing to do with building hp or a engine's air flow manners anymore
In theory 3 inch pipe will flow the same cbf of air at 5 psi that it will at 20 psi the change is the density of the air flowing thought the pipe. Now the base atmospheric air cbf numbers are no long on the same plane as the 20 psi number unless you let the pipe fill a space (like a big room so it not compressed anymore )
But at this point it has nothing to do with building hp or a engine's air flow manners anymore
Last edited by BigRich954RR; Mar 31, 2009 at 08:45 AM.
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This is a loaded question answer cant really be given. cause length of pipe/number of bends/ shape of bends/ the way the coupling fit to meet the pipe. All change the the flow amount.
In theory 3 inch pipe will flow the same cbf of air at 5 psi that it will at 20 psi the change is the density of the air flowing thought the pipe. Now the base atmospheric air cbf numbers are no long on the same plane as the 20 psi number unless you let the pipe fill a space (like a big room so it not compressed anymore )
But at this point it has nothing to do with building hp or a engine's air flow manners anymore
In theory 3 inch pipe will flow the same cbf of air at 5 psi that it will at 20 psi the change is the density of the air flowing thought the pipe. Now the base atmospheric air cbf numbers are no long on the same plane as the 20 psi number unless you let the pipe fill a space (like a big room so it not compressed anymore )
But at this point it has nothing to do with building hp or a engine's air flow manners anymore
sorry if i didn't make that clear.
the reason i ask is i know STS guys have problems with the piping they run once they push past about 700rwhp. now if we know that a 3.0inch pipe can support say 125lbs of air per min then you know you can run a 3.0 inch pipe on a 1000bhp setup.
basically just trying to understand at what point, BHP wise, you need to run bigger piping.
Cheers
Chris.