Uneven intercooler piping

[KazeSupra]

I had a question on intercooler piping. I plan on using a HX35/40 Hybrid, and I'm looking for 500whp. The turbo has a 2.5" exducer, so I was going to run 2.5" to the intercooler. I haven't decided on the intercooler, but I will definitely get one for 500whp. I plan on maximizing airflow by matching up everything, piping > TB > manifold etc. I'm also planning an a 3" GM MAFT. Here are my 2 proposed solutions:

1) turbo > 2.5" piping > intercooler > 3" piping > 3" GM MAFT > ~3" TB > Port matched manifold

2) turbo > 2.5" piping > intercooler > 2.5" piping > reducer > 3" GM MAFT > ~3" TB > Port matched manifold

Would one setup provide a better airflow than the other? Am I missing anything? Any assistance would be great. Thanks.

 

[Burnett03]

I had a question on intercooler piping. I plan on using a HX35/40 Hybrid, and I'm looking for 500whp. The turbo has a 2.5" exducer, so I was going to run 2.5" to the intercooler. I haven't decided on the intercooler, but I will definitely get one for 500whp. I plan on maximizing airflow by matching up everything, piping > TB > manifold etc. I'm also planning an a 3" GM MAFT. Here are my 2 proposed solutions:

1) turbo > 2.5" piping > intercooler > 3" piping > 3" GM MAFT > ~3" TB > Port matched manifold

2) turbo > 2.5" piping > intercooler > 2.5" piping > reducer > 3" GM MAFT > ~3" TB > Port matched manifold

Would one setup provide a better airflow than the other? Am I missing anything? Any assistance would be great. Thanks.

your diagram confuses me...
personally i would keep it 2.5 piping and use reducers for the gm maft

 

[Lunch_Box]

I would just go with 2.5" piping with a couple of reducers for the GM mas.

 

[tsibryan]

Just curious, are there any downsides to using 3" pipe? Besides fitting them in there, that's a given.

 

[Coup D E'Tat]

I'd go 2.5" from turbo to intercooler, 3" from intercooler to TB, because once the air cools down, it will flow better in a larger pipe.

 

[Maglin]

Actually for better efficiency and running different size IC piping you would want 3" from the turbo to the I/C and 2.5 from the I/C to the TB. Hotter air takes up more volume and thus the need for larger piping. Once it's cooled in the IC it is denser and the same amount of air takes up less volume and thus no need for the larger piping. To go 2.5 from the turbo to IC and then 3" from the IC to the TB would not only really be pointless as the bottle neck is actually between the turbo and IC but it would also effect spool up a bit since you would have to push more air to fill up the larger 3" piping from the IC to the TB. Probably not noticable but it would be their.

If you want go 3" the whole way. Then You wouldn't have turbulence in the piping that the 3"-2.5" reducer needed for the 3" GM MAF. That turbulence probably would really be noticeable in a comparison test but it would hurt efficiency slightly.

That is my .02. The physics is their and you should be able to see the why behind it all.

 

[KazeSupra]

Actually for better efficiency and running different size IC piping you would want 3" from the turbo to the I/C and 2.5 from the I/C to the TB. Hotter air takes up more volume and thus the need for larger piping. Once it's cooled in the IC it is denser and the same amount of air takes up less volume and thus no need for the larger piping. To go 2.5 from the turbo to IC and then 3" from the IC to the TB would not only really be pointless as the bottle neck is actually between the turbo and IC but it would also effect spool up a bit since you would have to push more air to fill up the larger 3" piping from the IC to the TB. Probably not noticable but it would be their.

If you want go 3" the whole way. Then You wouldn't have turbulence in the piping that the 3"-2.5" reducer needed for the 3" GM MAF. That turbulence probably would really be noticeable in a comparison test but it would hurt efficiency slightly.

That is my .02. The physics is their and you should be able to see the why behind it all.

I would love to go 3" all the way, but the turbo has a 2.5" outlet, so I was going to go 2.5" to the IC. Hmm...I guess it would be ideal to run 3" all the way, and then I only have 1 reducer instead of 2 with the 2.5" setup.

I did have a question...wouldn't running 2.5" from the turbo speed up the air coming from the turbo, making a little bit less lag?