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View Full Version : Intercooler piping question.



tunerb5
04-10-2007, 05:20 PM
Im in the middle of building my intercooler kit right now. The intercooler has 2.5" inlet/outlet so what I though about doing is using 2.25 piping on the turbo side and 2.5 on the throttle body side. Has anone tried this? I am also relocating my forge 004 to sit right before the throttle body. the bigger piping on the TB side should provife better flow and not drop the pressure as much. Wonder what every one else thinks. Also, is the TB inlet 2.5"?

ct1.8t4me
04-10-2007, 05:25 PM
Honestly, I would think that larger pipes would increase the pressure drop ever so slightly because it is a larger volume that needs to be filled.

I am still K03, but when I did my FMIC a couple weeks back, I used 2" all the way around and I did not notice ANY pressure drop at all.

ct1.8t4me
04-10-2007, 05:26 PM
TB inlet is 2.5"

pipe7284
04-10-2007, 05:34 PM
^^^^ show us a pic of your set up.

ct1.8t4me
04-10-2007, 05:47 PM
^^^^ show us a pic of your set up.

Me?

1 ate T
04-10-2007, 05:58 PM
Honestly, I would think that larger pipes would increase the pressure drop ever so slightly because it is a larger volume that needs to be filled.

I am still K03, but when I did my FMIC a couple weeks back, I used 2" all the way around and I did not notice ANY pressure drop at all.

False. I have 2 1/2" with 2" inlet/outlets and had no drop.

ct1.8t4me
04-10-2007, 06:10 PM
False. I have 2 1/2" with 2" inlet/outlets and had no drop.

I stated an opinion - are you stating a fact?

Anyway - I'm just sharing my experience.

europshhrc279
04-10-2007, 06:14 PM
i did 2.25 inch piping and got barely any pressure drop but did see a bit maybe about 1 psi...but then i just went to my local shop i had the revo installed and had them update it to to run about 2 psi more..so im good

1 ate T
04-10-2007, 06:19 PM
I stated an opinion - are you stating a fact?

Anyway - I'm just sharing my experience.

lol didn't mean it like I was shouting at you. [:D]

Just stating my experience as well.[up]

ct1.8t4me
04-10-2007, 06:42 PM
lol didn't mean it like I was shouting at you. [:D]

Just stating my experience as well.[up]

I just finished reading that TighTT Mike 2.0 fight club thread...

Hahahaha!

pipe7284
04-10-2007, 07:23 PM
Me?

yeah man. you!!!!! cant really see it in the avatar.

ct1.8t4me
04-10-2007, 07:28 PM
yeah man. you!!!!! cant really see it in the avatar.

I'll try and get some up tomorrow.

dualaudi
04-10-2007, 08:04 PM
TB inlet is 2.5"

i thought it was 2". Well i'm using the stock hose from the TB to the Cold end pipe, so is it reduced from 2.5 down to 2" with that hose on mine?

Side Note:
Do you think you could run some 004 vag com logs before the install, and then after? Let us know the difference the FMIC makes?

mike-2ptzero
04-10-2007, 10:31 PM
lol didn't mean it like I was shouting at you. [:D]

Just stating my experience as well.[up]

Exactly what is that "experience"?

Hard data to back that up?



2.5" IC pipes should be used on a BT setup since it will have a higher CFM. It is a waste of time on a K03 since the CFM will not max even a 2". Going larger just decreases velocity and increases lag.

2" on hot side and 2.25" on cold side would most likely be the best setup.

tunerb5
04-10-2007, 11:33 PM
Exactly what is that "experience"?

Hard data to back that up?



2.5" IC pipes should be used on a BT setup since it will have a higher CFM. It is a waste of time on a K03 since the CFM will not max even a 2". Going larger just decreases velocity and increases lag.

2" on hot side and 2.25" on cold side would most likely be the best setup.


well, I don't have a k03....I'm running a K04 pc16 with pretty much every bolt on. I am building the motor and going 2871r or bigger over the winter.....but then I wil lprobably need a bigger intercooler anyways. For pc16 i was going to stick with all 2.25but though it may benefit from 2.5" piping on the cold side

mike-2ptzero
04-10-2007, 11:59 PM
well, I don't have a k03....I'm running a K04 pc16 with pretty much every bolt on. I am building the motor and going 2871r or bigger over the winter.....but then I wil lprobably need a bigger intercooler anyways. For pc16 i was going to stick with all 2.25but though it may benefit from 2.5" piping on the cold side

Well you could use the 2.25 on the hot side and 2.5" on the cold side for both the K04 and BT setup, this way you could just then swap in a larger fmic when you go BT. You just dont want to make the hot side smaller then the turbo outlet and larger then the TB on the cold side since these will add flow restrictions(bottle neck).

ct1.8t4me
04-11-2007, 06:46 AM
i thought it was 2". Well i'm using the stock hose from the TB to the Cold end pipe, so is it reduced from 2.5 down to 2" with that hose on mine?

The TB is definitely 2.5" - at least on the AEB engine. The stock turbo outlet tubing is 2" - that's personally why I used 2" - because I am still K03, and the 2" tubing was plug and play with the stock outlet tube which I retained. I needed 3 2-2.5" reducers - one for the TB and 2 for the inlet/outlet of the intercooler that I ended up using.

UN-PIMP-Z-A4
04-13-2007, 09:31 AM
Im in the middle of building my intercooler kit right now. The intercooler has 2.5" inlet/outlet so what I though about doing is using 2.25 piping on the turbo side and 2.5 on the throttle body side. Has anone tried this? I am also relocating my forge 004 to sit right before the throttle body. the bigger piping on the TB side should provife better flow and not drop the pressure as much. Wonder what every one else thinks. Also, is the TB inlet 2.5"?

What did you finally decide to purchase and did you buy reducers?

tunerb5
04-13-2007, 11:17 AM
got all 2.25, thought it would look odd with different size piping on both sides of the intercooler. So no I have the intercooler, the piping, clamps, couplers, reducers, a flange to relocate the forge 004 next to the throttle body. Also bought a power steering cooler, lines, etc. Should be a fun project next week when the piping comes in.

UN-PIMP-Z-A4
04-13-2007, 11:58 AM
Style over function especially since no one would see that the piping was not the same diameter... [:p]

tunerb5
04-13-2007, 12:08 PM
Style over function especially since no one would see that the piping was not the same diameter... [:p]

with my setup i don't think I would gain anything with the 2.5" piping ont he cold side......when I do BT then i will see, as I will need a bigger core anyways.