Air intake size

[carvinbassplyr]

So I have one of the chinabay air intake systems from chrome intakes. I like it and it's worked well enough. I did notice that it tapers down quite small on the turbo inlet side though. Right now I have a 14B so air flow isn't a huge issue, but when I upgrade the turbo setup I'll probably have a turbo with a 3" inlet so could I get away with using a reducer coupler backwards (going from small to big) or do I need to fork out more cash and get a 3" dejon intake?

 

[rEclipserGST]

Why is this a real thread?

Go 4" or go home.

 

[Bud92gsx]

2.75 inlet on mhi turbo's,14b.16g.

 

[blktalon3]

You don't want the outlet from the intake bigger than the inlet to the turbo. FP has a nice 4" intake for cheap also, that way you'll probably never outgrow it.

 

[carvinbassplyr]

You don't want the outlet from the intake bigger than the inlet to the turbo. FP has a nice 4" intake for cheap also, that way you'll probably never outgrow it.

The FP intake only has the fitting for the BOV...

 

[phunny]

The FP intake only has the fitting for the BOV...

IF your BOV is on your intake you have some serious issues already...

 

[carvinbassplyr]

IF your BOV is on your intake you have some serious issues already...

I have issues because I choose not to use SD? Sorry, I want this car to "appear" as stock as possible and venting to the atmosphere is a dead give away that draws to much attention from the local 5-0. Thanx for being so helpful....

 

[rEclipserGST]

Take a look at my gallery. I have the identical pipe as you. But I upgraded the MAF adapter to a wider mouth.

EXTREME PSI : Your #1 Source for In Stock Performance Parts

Ended up getting this sense my previous filter was a bit dirty.

But I adore the shorty filter from autozone. Check my gallery for pics.

 

[boost97gst]

Im interested in this too. I have the same "chrome intakes" piece on my car and its def small. About 2" outlet. Im going to a t04E which is 3" right now. I wonder if theres a need for a 3" intake.... I mean really, not just hypothetically, has anyone ran a ebay intake on the dyno? To see if it really holds the car back

 

[Jon91TSi]

Using an intake that is much larger than your turbo inlet (IE 2.75"-4") can cause turbulence when the coupler reduces the size and it can actually hurt your performance. If you have a stock frame turbo 14b,16g,20g stick with 3", if you have a 4" inlet stick with 4". This has been beaten to death. Search and you will find what I'm talking about.

 

[carvinbassplyr]

You don't want the outlet from the intake bigger than the inlet to the turbo. FP has a nice 4" intake for cheap also, that way you'll probably never outgrow it.

I'm a little confused by this...you're saying that the intake outlet should NOT be bigger than the turbo inlet (example 2" intake outlet-3" turbo inlet), but then you tell me to get a huge 4" intake

 

[boost97gst]

No hes saying to match the outlet of the intake to the inlet of the turbo.

 

[carvinbassplyr]

Using an intake that is much larger than your turbo inlet (IE 2.75"-4") can cause turbulence when the coupler reduces the size and it can actually hurt your performance. If you have a stock frame turbo 14b,16g,20g stick with 3", if you have a 4" inlet stick with 4". This has been beaten to death. Search and you will find what I'm talking about.

I understand that....but what about going the other way? Like having a 2" intake outlet and using a reducer coupler backwards to go from 2" up to 3"

 

[Jon91TSi]

I understand that....but what about going the other way? Like having a 2" intake outlet and using a reducer coupler backwards to go from 2" up to 3"

What would be the point of that? You would be creating a bottleneck by doing that, plus you would have no room to grow. Nobody likes buying the same part twice.

 

[carvinbassplyr]

What would be the point of that? You would be creating a bottleneck by doing that, plus you would have no room to grow. Nobody likes buying the same part twice.

I was just wondering if it would cause turbulence problems. I understand how using an over-sized intake with a reducer at the end can cause problems because you're choking the airflow right before it goes into the turbo, but if the intake outlet is already small and your just using an adapter to fit it to a larger turbo would it have the same effect? I have some dejon intakes lined up to purchase used but none of them have the extra vacuum line fittings like the chrome intakes and extreme psi ones do. So it's either go with a small intake that has all the fittings you need or go with a bigger intake and figure out what to do with the vacuum hoses.

 

[Jon91TSi]

I was just wondering if it would cause turbulence problems. I understand how using an over-sized intake with a reducer at the end can cause problems because you're choking the airflow right before it goes into the turbo, but if the intake outlet is already small and your just using an adapter to fit it to a larger turbo would it have the same effect? I have some dejon intakes lined up to purchase used but none of them have the extra vacuum line fittings like the chrome intakes and extreme psi ones do. So it's either go with a small intake that has all the fittings you need or go with a bigger intake and figure out what to do with the vacuum hoses.

No, it shouldn't. The oly problem you are creating is a bottleneck pre-turbo. Also, filters compatible with a 2" intake are usually small in size and don't have much surface area (surface area being the key word), the more surface area a filter has the more potential it should have for a higher CFM rating. You can remedy the nipple by using a threaded barb and drilling the intake for the barb and using pipe dope or JB weld to seal the already threaded fitting into the hole securely. You could also have a fitting welded into the pipe, its not a big deal.

 

[99gst_racer]

It's best to match the intake diameter to the diameter of the inlet of the turbo. So, when you switch turbos, you should also install an appropriate sized intake for the new turbo.

 

[carvinbassplyr]

No, it shouldn't. The oly problem you are creating is a bottleneck pre-turbo. Also, filters compatible with a 2" intake are usually small in size and don't have much surface area (surface area being the key word), the more surface area a filter has the more potential it should have for a higher CFM rating. You can remedy the nipple by using a threaded barb and drilling the intake for the barb and using pipe dope or JB weld to seal the already threaded fitting into the hole securely. You could also have a fitting welded into the pipe, its not a big deal.

Well the intake/filter is rather large. It's just when you get to the turbo inlet it shrinks very substantially at the curve going to the turbo...even the extreme psi ones do this...don't understand why they did it that way...