Pics of stock intake elbow restriction

[JDiepstra]

I hope I was able to load the pictures properly, it was my first time...



I was surprised to see the amount of restriction from the stock intake elbow so I thought I'd share a couple pictures. As you can see, the elbow is about 2/3 blocked by a stick of gum. With huge filters, torque tubes, and 4 or 5" inch exhausts, this must be the choking point.



With an AFE Blade Runner installed I feel I may have quicker turbo spool up and a little better MPG's but no data to back it up cause I don't have time for that! I do think I can feel it in the seat of the pants o'meter at low to mid RPM's.

 

[Forrest Nearing]

try fitting that stick of gum through an open intake valve!



That is not your main restriction point, but I'm sure replacing it with a better flowing unit won't hurt

 

[Walcott]

what is the main restriction point??

 

[Forrest Nearing]

the cylinder head

 

[ScottLauer]

try fitting that stick of gum through an open intake valve!

How about through 12 Intake valves at the same time? or 6. I think the collective area of all the intake valves open would probably be enough to fit the gum through.

 

[Forrest Nearing]

How about through 12 Intake valves at the same time? or 6. I think the collective area of all the intake valves open would probably be enough to fit the gum through.

how many intake valves are taking in air at once? two... they're very small, and they don't open very much... and the ports leading up to the valves don't flow as much as the valves are capable of flowing

 

[BHolm]

The replacement intake horns all show hp and tq improvements on an independant dyno, mostly in the mid range. There is no doubt that removing that restriction makes a difference. I have had my CFM+ on, off, then on again. I can feel a huge difference in response, especially with the box turned up a little. It improved flow enough to lower egts by 150-200 degrees. I think you will like the Bladerunner.

 

[CToney]

Check out what a 2nd gen 24v intake horn looks like. I believe they are not as restrictive. Smooth laminar flow is better than restricted, turbulent flow. How come the significant gains at 1900-2100 rpm? There has to be something to it or somebody sure is flinging around a lot of BS to make a buck.

 

[DerekW]

what is the main restriction point??

the cylinder head

I think most will find that the biggest restriction in the cylinder heads is the 5 grand and a few months waiting time ray-mac qoutes for cylinder head work. Not many of us have that kind of pocket change especially when twins (cp3 and turbos) are the only way to go these days.



government: "empty your pockets or pay rediculous interest and possibly go to jail"

 

[klenger]

This is the high-pressure side of life, right? At 30+ PSI, I'll bet you can push a lot of air through that opening.

 

[BHolm]

This is the high-pressure side of life, right? At 30+ PSI, I'll bet you can push a lot of air through that opening.

No doubt about it. In fact we know over 500 hp can be made with that stock horn on there.



However, the gains off boost and at low boost are obvious and substantial with a high flow horn. People spend $3-500 on cold air intakes that do nothing more than make noise. The new horn actually increases low end power and drivability for the same money. It is my favortite bomb.

 

[JWash1]

This is the high-pressure side of life, right? At 30+ PSI, I'll bet you can push a lot of air through that opening.

Then it stands to reason that at 30+ PSI you can push a LOT more air through a larger, less restricted intake horn on the high pressure side of life, Right? Yeah, I Thought so!

 

[USMCBay]

Guys - I think the only true test here would be to use the stock vs. an aftermarket and see which one blows the bigger bubble out of the tailpipe... but you would have to use something high performance - like Big League Chewing gum. :-laf



Just a thought to solve this thread. :-{}



:-laf:-laf

 

[Forrest Nearing]

I think most will find that the biggest restriction in the cylinder heads is the 5 grand and a few months waiting time ray-mac qoutes for cylinder head work. Not many of us have that kind of pocket change especially when twins (cp3 and turbos) are the only way to go these days.



government: "empty your pockets or pay rediculous interest and possibly go to jail"

well... any decent machine shop and head porter can port the head... even mild bowl work will make a nice improvement. I disagree that twin pumps and turbos are the only way to go.

 

[NIsaacs]

Then it stands to reason that at 30+ PSI you can push a LOT more air through a larger, less restricted intake horn on the high pressure side of life, Right? Yeah, I Thought so!

I can see under no boost/vacuum conditions, a larger opening would be a nice benefit, however my guess is the small horn will flow as much as the engine can swallow at high boost.





"NICK"

 

[BHolm]

There are independant dyno results for several of these intakes posted on this site. The proof is in the pudding, you may "think" whatever you want, ALL of the aftermarket intakes made more hp and torque than the stocker. The improvements are better lower in the rev range but they still made more peak power as well.