i'm being the test bunny on blower porting, i got it setup with the shop doing the work and as soon as i pickup my beater car for the winter i will be shipping out my blower. they said it will take about 3 days or so to get the work done after i get it to them..... so if possible i'll post up some #'s if i can get it on the dyno afterwards

 

It's a sound idea, the less restriction you have, the easier it will be for the S/C to make Boost.

You will end up with.

Colder Charge Temp
More Boost

or Both!

You may end up with even better numbers if you try to polish the entire path of flow as well..

Subscribing for Results.

 

on the other blowers they do, it actually lowers the psi cause it allows more volume, but we can solve that with a smaller pulley

 

I don't understand. If it is going to lower the boost, how will it help. would it be benaficial for stock pully size, or without a piggyback?

 

how much will it cost?

 

Doesnt porting the blower increase the cfm and keep boost the same.

 

Boost is kind of like back pressure in a way. When the blower is ported it makes the inside of the blower larger so it moves more air more effeciently which will lower the boost but will also increase the power at the same time.

 

Exactly, less restriction = less PSI of boost, being that there there is less pressure when the air can flow more freely. Thats a good thing though, beause not only does power go up, but when you bump the boost back up to its previous level as it was before the mod (with a smaller pulley) you get even more power

 

OK- so correct me if I am wrong.

If you increase the volume (hance porting) in the blower boost will go down since there is less pressure. But power will go Up since it is easier to move the amount of air.


So technically you will be making more power then before the porting with less boost?

 

I would imagine ud want to do this in conjunction with a custom tune since the ecu already wigs out just by adding an intake.

 

Exactly. If you have an air compressor at home, out a small diameter chuck on the air hose, and set a certain psi..then put on a larger diameter chuck, and do the same thing. You notice a lot more air coming out...It's not psi that matters so much as volume.

 

nope, i'm doing it stock, and if there are any issues i'll be getting a stage 2 reflash when it's available

 

+Volume = +CFM = +HP

 

= -psi

 

i think

 

its not about how much psi of boost you have, its about how efficent everything flows, there are some RL's around here with ported blowers, and i have heard nothing but good things about it, so hope everything goes good!

 

Umm, No.


Pressure would not drop just becasue the Compressor is able to pump more freely...

That would be "Anti Physics"

 

Pressure builds in the manifold not in the blower. So porting the blow will not decrease the manifold pressure. In fact if the blower became more effcient then the pressure in the manifold would increase.

 

i heard rumors here and there, but haven't actually heard of the people doing it. do you know if they hang around the rl forums?

 

so Brian this is wrong?

 

Its similar to turbos, if you port the turbo on say a dsm, it will still boost the same psi but flow more air at the same psi. Which is why similar turbos or superchargers running the same psi can produce varying hp increases. Your just increasing efficency, if anything psi will go up if all other things remain the same.

 

Bite Your Tounge...

 

If one ported the head and intake manifold and upgraded the exhaust system (header, dp, cat back) AND left the blower stock you would probably see a drop in the manifold PSI. Of course thats just speculation.

 

As far as what zinner just said, hes correct. Anytime flow capability is increased after the manifold you should see a loss in PSI even though theres a gain in power. Its called "boost stacking" in w-body land. If you install headers and a full exhaust on a GTP you will usually see a loss in boost but a significant gain in power due to the increased CFM on the exhaust side. The easier the engine can pump out the exhaust, the less boost gets "stacked" in the intake waiting to be let into the chambers. Its an odd theory but understandable if you think about it for a minute.
Porting the blower on the other hand shouldnt result in a decrease of PSI. If anything it might result in a slight increase of pressure due to the increased efficiency and decreased air temperature. THe final results all depend on the port job though

 

Well porting a turbo will not change the pressure because of the wastegate.

But Porting the S/C will cause it to make more volume and because it's driven by the pulley and it hasn't changed in size and the displacement of the engine hasn't changed, the engine will get more volume being pushed into it making more HP and a backlog of pressure in the intake Manifold.

Porting The SC = More Effecient
+Volume
+Pressure
+Horsepower