Single or twin entry intercooler - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Raiju · 3rd August 2008, 06:56 PM

I am just about to upgrade to a twin 3037 setup in place of my T78 for dragging. Have any of you who run large twin kits used a single entry intercooler or have you all gone twin entry? The intercooler i have is perfect for my needs but only single entry and i'm not sure what kind of restriction i'm going to get if i join the pipes pre-intercooler.

Any advice would be greatly appreciated.

Cheers

fabianGTR34 · 3rd August 2008, 07:49 PM

as long as the section where the 2 hotpipes go over to 1 pipe is smooth and not much restricted then single entry should do just as well. Just make sure the 2 air flows of the hotpipes don't interfere one another.

The twin entry intercooler is one way to make a smooth transition between the 2 airflows of the hotpipes. The same can be done before the intercooler, by making smooth pipework.

cheers

Raiju · 3rd August 2008, 08:07 PM

That's interesting thanks, that's simple enough. Is it advisable to ensure the two hot-pipes from the turbos are the same length before they meet so as to ensure equal, balanced airflowbetween the two?

Many thanks.

fabianGTR34 · 4th August 2008, 06:17 PM

Idealy yes, but if the construction of the equal length would lead to worse piping for one of the other turbo's then maybe a little consession could be made. And I think that a little difference in length is not as bad as unsmooth pipework. Because the volume flow rate of the hotpipes is more than the volume flow of the engine in overboost situations, so if there is a minor delay in the air arriving to the plenum to be presurized due to a little longer pipework would not realy have a bad influence. Because the higher volume flow of the hotpipes will make the air catch up in te plenum. Where the Volume flow is lower. (Don't mistake volume flow for the mass folw because the mass stays the same) That's why I would find that not as bad as pressure loss due to sharp bends and other bad pipework.

And to keep the turbo's in balance you could make a balance pipe between the intake pipes of both turbo's to the pressure difference between them is dampened out a bit..

3rd August 2008, 06:56 PM	#1 (permalink)
Raiju GTR Register Member Join Date: May 2008 Posts: 102	Single or twin entry intercooler I am just about to upgrade to a twin 3037 setup in place of my T78 for dragging. Have any of you who run large twin kits used a single entry intercooler or have you all gone twin entry? The intercooler i have is perfect for my needs but only single entry and i'm not sure what kind of restriction i'm going to get if i join the pipes pre-intercooler. Any advice would be greatly appreciated. Cheers

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3rd August 2008, 07:49 PM	#2 (permalink)
fabianGTR34 GTR Register Member Join Date: Aug 2006 Location: Netherlands Posts: 225	as long as the section where the 2 hotpipes go over to 1 pipe is smooth and not much restricted then single entry should do just as well. Just make sure the 2 air flows of the hotpipes don't interfere one another. The twin entry intercooler is one way to make a smooth transition between the 2 airflows of the hotpipes. The same can be done before the intercooler, by making smooth pipework. cheers

3rd August 2008, 08:07 PM	#3 (permalink)
Raiju GTR Register Member Join Date: May 2008 Posts: 102	That's interesting thanks, that's simple enough. Is it advisable to ensure the two hot-pipes from the turbos are the same length before they meet so as to ensure equal, balanced airflowbetween the two? Many thanks.

4th August 2008, 06:17 PM	#4 (permalink)
fabianGTR34 GTR Register Member Join Date: Aug 2006 Location: Netherlands Posts: 225	Idealy yes, but if the construction of the equal length would lead to worse piping for one of the other turbo's then maybe a little consession could be made. And I think that a little difference in length is not as bad as unsmooth pipework. Because the volume flow rate of the hotpipes is more than the volume flow of the engine in overboost situations, so if there is a minor delay in the air arriving to the plenum to be presurized due to a little longer pipework would not realy have a bad influence. Because the higher volume flow of the hotpipes will make the air catch up in te plenum. Where the Volume flow is lower. (Don't mistake volume flow for the mass folw because the mass stays the same) That's why I would find that not as bad as pressure loss due to sharp bends and other bad pipework. And to keep the turbo's in balance you could make a balance pipe between the intake pipes of both turbo's to the pressure difference between them is dampened out a bit..