3" intercooler piping too big?

[2bar4g63t]

whats up guys, just changed intercoolers and this one has 3"inlets and i have a bunch of mandrel bent 3" pipes in my garage, wanting to see if you guys thought this would be to big? My turbo is a 57 trim turbonetics t3t4. Would this piping decrease air velocity too much or somthing? i ono but i wwannt to use it cuz its free. thanks!

 

[1fast97gsx]

I was considering 3" as well since my intercooler inlet/outlets are 3" however it seems overkill. The problem is the throttle body is not 3" so a lot of the air will loose velocity as it hits the side of the throttle body. 3" would be nice though since the gm maf is available in 3".

oh and I'm running a pte 56 trim ...

 

[BISHILVR]

actually, velocity will INCREASE as the air goes from the 3" pipe to the smaller throttle body......for what its worth..............

 

[Royalty]

actually, velocity will INCREASE as the air goes from the 3" pipe to the smaller throttle body......for what its worth..............

personally i think the same size pipeing would be best

 

[leet]

actually, velocity will INCREASE as the air goes from the 3" pipe to the smaller throttle body......for what its worth..............

Bernoulli's principle states that air is sped up through a venturi it will lose pressure.

However, I doubt it will affect anything.

 

[Mirage2LTurbo]

3inch upper IC pipe and 3.5inch side pipe

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[2bar4g63t]

ok so i wont loose much if any performance from this then correct?

 

[Mirage2LTurbo]

ok so i wont loose much if any performance from this then correct?

No, you'll be fine.

 

[Eclipsei95cl]

No, you'll be fine.

Can u even fit a full 3in ic piping through a 2g? I have heard thats too big to fit in a 2g, also never ever heard it done on a 2g before nethier, and plus frankly 2.5in is plenty already.

 

[2bar4g63t]

Can u even fit a full 3in ic piping through a 2g? I have heard thats too big to fit in a 2g, also never ever heard it done on a 2g before nethier, and plus frankly 2.5in is plenty already.

okay, ide like to think maybe you didnt hear me but its right there in black and white, i already have this in my garage, if i had 2.5 ide use it, just wanted to confer with a couple knowledgeable people to see if i should use the free stuff i have or go out and buy 2.5inch. just to be frank

 

[2bar4g63t]

No, you'll be fine.

alright cool. car looks good by the way, hardcore

 

[Eclipsei95cl]

okay, ide like to think maybe you didnt hear me but its right there in black and white, i already have this in my garage, if i had 2.5 ide use it, just wanted to confer with a couple knowledgeable people to see if i should use the free stuff i have or go out and buy 2.5inch. just to be frank

oh i heard u but i was just saying would it fit in ur car, ok...Like you said its not in the car its sitting in your garage. So what if it doesnt fit...? I just hear of some people not going 3in because it wouldnt bolt up or fit quite well in 2gs.

 

[2bar4g63t]

i test fit it to see if i even had the right peices and it fits not prob, i could fit 5" if i wanted.

 

[Eclipsei95cl]

well then it shouldnt be a problem...

 

[Defiant]

That makes for a helluva lot of volume to pump air into, all of which has to be pressurized to get any to the plenum.

 

[DSMJim]

I go 12.1@115mph with a 2.25" upper intercooler pipe, what the hell would you want 3" for? You got a hemi in that thing? I'm considering going to 2.5" but only because I may go with a maf translator and nobody makes 2.25 - 3" maf piping upgrade.

 

[2bar4g63t]

guess i better go buy some 2.5 then

 

[BigLGST]

I go 12.1@115mph with a 2.25" upper intercooler pipe, what the hell would you want 3" for? You got a hemi in that thing? I'm considering going to 2.5" but only because I may go with a maf translator and nobody makes 2.25 - 3" maf piping upgrade.

Dejon Tool does. I have a HRC FMIC kit and it rocks 2.25" piping. I am running Dejon Tool 3" MAFT Blow Through setup and they provided me with the piping. Only thing is that my piping routes back to stock location. I am not sure if yours does, but if it does their kit would work, or I am sure they will be able to make something for you.

 

[2bar4g63t]

ok just read a post by the other "dsmtuner wiseman" and he said that the stock t25 makes enough air to fill the 2litre engine 1500 times per minute, so 3" piping shouldnt make any noticeable difference what so ever, right?

 

[99gst_racer]

ok just read a post by the other "dsmtuner wiseman" and he said that the stock t25 makes enough air to fill the 2litre engine 1500 times per minute, so 3" piping shouldnt make any noticeable difference what so ever, right?

3" should be OK. If I had a choice, it would be 2.5", but you might as well use what's free. It shouldn't make a difference. If anything, maybe a slightly slower spool-up. Not much of a noticeable difference though. Show us pics when you get it all installed.

 

[Mirage2LTurbo]

3" should be OK. If I had a choice, it would be 2.5", but you might as well use what's free. It shouldn't make a difference. If anything, maybe a slightly slower spool-up. Not much of a noticeable difference though. Show us pics when you get it all installed.

Spoolup would be damn near the same.. that is if you measure boost at the compressor housing. If you measure manifold pressure, there might be a slight delay over smaller piping, but I couldn't imagine it being anything even noticeable. I'm running a 2.5in lower IC pipe, then 3in upper.

 

[Defiant]

Spoolup would be damn near the same.. that is if you measure boost at the compressor housing. If you measure manifold pressure, there might be a slight delay over smaller piping, but I couldn't imagine it being anything even noticeable. I'm running a 2.5in lower IC pipe, then 3in upper.

I'm sure that's backward. Smaller piping should build boost more quickly. You have forced induction- you're not counting on the atmosphere's stack of pressure to find its way through a pipe and into the tops of your pistons. You shouldn't have flow issues at 2", it's forced in. And the damned intercooler and all the corners will ruin hopes for a "smooth path" anyway. You're just pressurizing a volume, and the smaller the volume is -to a reasonable point- the more quickly it'll attain a given pressure.

 

[Mirage2LTurbo]

I'm sure that's backward. Smaller piping should build boost more quickly. You have forced induction- you're not counting on the atmosphere's stack of pressure to find its way through a pipe and into the tops of your pistons. You shouldn't have flow issues at 2", it's forced in. And the damned intercooler and all the corners will ruin hopes for a "smooth path" anyway. You're just pressurizing a volume, and the smaller the volume is -to a reasonable point- the more quickly it'll attain a given pressure.

We're on the same page, I phrased it wrong. Smaller piping will fill faster over larger piping, but the differences are nill.

 

[2bar4g63t]

well ive got some 2" too but i heard everyone say to get at least 2.25...

 

[DSMJim]

well ive got some 2" too but i heard everyone say to get at least 2.25...

Still ain't buying it. I have 2" from the turbo to intercooler and 2.25" from the intercooler to throttle body. It doens't seem to be hurting me at all.