better flow = less spool. is this right?

[wolvee123]

There is a vendor on here selling a set of Big Ported Heads and I am kind of at a loss. Isn't it true that when you make the flow easier on a head the boost flows more freely and less actual boost is gained? I am used to v8's and the like so when heads are ported with a SC it works more efficiantly but is this true for turbo 4's

http://www.dsmtuners.com/forums/showthread.php?p=151043946#post151043946



Mike

I want to start buying parts over the winter and am looking at all my options, thanks

 

[Dark_Horse]

When you port your head, less boost will make more HP. If you had a very, very restrictive head, you may be able to run 25psi, but the WHP would be pretty low due to restriction. When you port the head, you can achieve the same WHP with less boost.

The amt of boost you are running means nothing, it all depends on efficiency of your setup.

 

[andymoraitis]

Very nicely said. Volumetric efficiency is all about matching the right parts to the right setup. Put a great combination together (head, cams, intake, turbo, port work, FMIC, charge piping, exhaust) that works well in concert and you'll have higher VE on less boost as was correctly mentioned above.

This is the single most overlooked component of parts purchasing and makes people wonder why some tuners can make so much power on less investment. It's all about the flow.

Cheers,

Andy

 

[MyBeatGSX]

Yes its true. The turbo will now have to supply more air to hit a given boost level, this will take longer than it did before with your crappy flowing head. Of course that won't matter because you'll be making more power.

 

[wolvee123]

Cool guys thanks... Looks like I'll be doing a lot of reading over the winter try and get the best setup... Thanks


Mike

 

[Defiant]

You want to see high boost? Put a big cork over the end of the compressor's output and measure what the "boost" is.
Any boost you read is simply more than the engine can take in, even when forced.

 

[wolvee123]

Thanks for the help again.

I'm not a HP junkie or anything but if I'm going to do something, i wanna make sure it's right and gives me the best well rounded fun and reliability. If the end result is a 300 horse DD then so be it. in the end i hope it's well rounded, Good looking, Fast, and efficient... Can't wait to start diggin into it.


:dsm

Mike

 

[Rick@AP]

I think everyone has forgotten about one major componet, velocity. Make the port too large and you lose it.

Head porting is a balancing act.

 

[MyBeatGSX]

You don't lose it, you just need to flow more air to achieve it. That's why small ports make power at low rpm and larger ports make more power at high rpm.

 

[Rick@AP]

You don't lose it, you just need to flow more air to achieve it.

If it requires more air flow then you've lost velocity.

The trick is to open the port enough that velocity is retained while increasing the amount of air able to flow through the port.

That's why small ports make power at low rpm and larger ports make more power at high rpm.

Sometimes yes.

It also explains why a Polk stage 50 billionty ported head loses power on cars that do not have the mods to utilize the port work.

 

[DSMunknown]

Perhaps someone can discuss the topic of velocity stacks and how they help air flowing into the head from the intake manifold. Granted that there are quite a few threads that mention the Magnus velocity stacks, but I would like to see an in-depth discussion on why they are more effective than their old design.



http://dsmtuners.com/forums/search.php?searchid=2182609

 

[XtremeGST]

Porting is good however expensive, but worth it. Make sure if you port you get it done by a professional, send it to a machine shop its worth it (unless ## gasket matching) if you do it yourself do NOT go over a half inch (1/2") into the head on both exhaust and intake side otherwise u risk going into the water jacket and your head is ruined.

Remember
Velocity = Torque
CFM's = Horsepower
You want a 50/50 balance of this, bigger is NOT always better. make sure your Cam(lobe lift and duration) turbo, head porting, exhaust manifold(or header), intake manifold, exhaust piping, and intercooler piping all match the same diameter or very close. on the exhaust you can go abit bigger. dont waste your money do it right the first time

 

[1bad92awd]

Great info about head porting on this thread. Not much for me to add in. Porting is an expesive serivce, but definately worth the money.

 

[MyBeatGSX]

Perhaps someone can discuss the topic of velocity stacks and how they help air flowing into the head from the intake manifold. Granted that there are quite a few threads that mention the Magnus velocity stacks, but I would like to see an in-depth discussion on why they are more effective than their old design.



http://dsmtuners.com/forums/search.php?searchid=2182609

I believe it has something to do with the law that says something about a fluid increasing in velocity when forced through a smaller area. A tappered runner will have higher velocity for a given flow than a straight one, thus letting you get more air in. I don't know if they have the intake trumpets too, but those make for a smooth transition into the runner and equals more flow again.

That's about as in depth as I can get... where are the engineer guys.