TRD/ Magnuson 4.0 Supercharger Tips, Tricks, and Mods

I'm running a TRD cold air intake box there's only one filter in it

 

I don't know the diameter of the ARB snorkel that I'm talking about all I know is that they talk about ensuring air flow for force air induction and I also have a you URD 2.825 pulley

 

@XPOTRPR

 

Likely removed the charcoal filter.

Got to get you Houston Members to get together for the next Coffee and Cars, or another get together.

 

Sounds like a great idea

 

That's what I'm talking about! Thanks for the input!

 

Air flowing through a given tube diameter WILL have a certain amount of resistance or restriction (pressure drop). The amount of pressure drop is determined by tube diameter, length, and flow (CFM). Think of that 50ft hose you have in your front yard. It works like a champ with plenty of pressure but when you add another 50ft section of hose onto it (100ft total), you notice there is less water pressure coming out of the hose. Of course the physics of water and air are different but the principle is the same (resistance to flow increases with length). For max sc performance you want the least inlet pressure drop possible. Positive displacement superchargers DON'T like inlet restrictions.

 

Nor do turbos.

 

I completely understand what are you talking about and it makes a lot of sense but wouldn't the ram air scoop at the top of the snorkel Force the air in
https://goo.gl/images/9JLHuV

 

@jberry813

Yeah.. when I compared running the snorkel vs not.. I was up about a half pound to a pound of boost without the snorkel.. via Torque App and AEM boost gauge. Just so much restriction. I still run the snorkel over not due to the dust here in AZ.. and my intake temps were cooler compared to running no snorkel (drawing from fender/engine bay). I'll give up a little boost for cleaner, cooler air.

 

What brand and part# snorkel you running?

 

Yessir. Airflow with secondary charcoal filter cut out.. and running a K&N drop in.

That's how I did my tests too. Just unclamped the last piece of tubing and let it draw from the inlet on the box.

I'm also running a 2.6 pulley.

I fully believe my lower boost numbers are due to a combination of a few things.. a vacuum leak that's been haunting me on and off is the main factor.. plus the snorkel, belt slippage, etc. Nothing too bad to make me want to ditch it all. the setup works good for my needs .

Airflow... And that's all I know. Lol. Snagged it in a GB a while ago .

 

@jberry813 So it seems at your 6500ft altitude, 2.85 pulley, and your airflow requirement (CFM) your intake system is sufficient for your needs.
@XPOTRPR with smaller 2.6 pulley and lower altitude, obviously has a larger airflow requirement and may benefit from a larger diameter inlet.
If you ran your tests back to back and found lower boost with snorkel installed then you found the restriction.
Now there is the possibility that the restriction also causes the sc belt to slip since the sc has to draw more power to suck the air in (parasitic loss).

 

True story!

 

I'm going to go with a no on that last part. (The restriction causes the belt to slip part)

 

Of course you are entitled to your opinion but allow me to provide an example:

1. You have to fill your lungs one time in one second from full exhale to full inhale 1 second.

Test 1. no restriction....minimal effort required

Test 2. inhale through soda straw...Still doable maybe but much more effort required. This is muscular diaphragm real world effort required to pull in the same amount of air (parasitic loss). This increased effort required is directly proportional to tube diameter, length, and cfm requirement.

I have actually driven my sc with my 2200rpm corded drill while not installed on the truck. With 0 outlet restriction (boost) I slowly closed off the inlet of the sc. What do you think happened to the drill rpm as the inlet restriction increased?

 

So to sum this whole (snorkel or not to snorkel) question it could be okay to use a snorkel depending on the mods that you had done to your supercharger.
What I'm getting at is the smaller the pulley that you're using in you supercharger you will have more demand for air so you will have lost of boost and horsepower.
So maybe just maybe if you stay in the 3.00 or 2.825 pulley you could be ok according to the altitude that you live at.