Hummer H2 air filter for big a$$ turbos FC3S S4
05-29-08, 06:21 PM
#26
restrictive airbox at temp...
bigger turbo woooooo!
stock intercooler
probably not the most efficient use of the turbo??
Call up K&N tech support they will help you determine what cone air filter would be best.. there are calculations when choosing the right air filter *length height x base* etc.. which gives you the cubic air reading.
Maybe use some more hose to feed air into the airbox?
bigger turbo woooooo!
stock intercooler
probably not the most efficient use of the turbo??
Call up K&N tech support they will help you determine what cone air filter would be best.. there are calculations when choosing the right air filter *length height x base* etc.. which gives you the cubic air reading.
Maybe use some more hose to feed air into the airbox?
05-29-08, 06:29 PM
#27
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Equation:
(Change in Temp) = (Absolute Intake Temp) * ((Pressure Ratio)^(.238) -1) / (Compressor Efficiency)
Absolute Intake Temp is on the Rankine Scale, so intake temp is *F +460
(Pressure Ratio) = (Boost + 14.7psi) / (14.7psi)
So, let's work through an example:
Let's say we have an 80% efficient turbo, boosting at 14.7 psi (just to make things easy). That gives us a Pressure Ratio of 2.
Let's compare a cold air intake of 70*F (530*R) and a hot air intake of 120*F (580*R)
Pluging the numbers into the equation, we get a temperature rise of
CAI: 119*F
HAI: 130*F
So, in fact, the warmer the air your turbo is ingesting, the greater the rise in temperature of that air.
On the topic of intercooling, yes, the greater the temperature difference between the ambient air and the air flowing through the intercooler the more the air is cooled, but once again it is not a linear relationship. To get the coolest intake temps to the engine, at a set boost pressure, compressor efficiency, and with or without intercooling, you must get the coldest possible air into the turbo.
(Change in Temp) = (Absolute Intake Temp) * ((Pressure Ratio)^(.238) -1) / (Compressor Efficiency)
Absolute Intake Temp is on the Rankine Scale, so intake temp is *F +460
(Pressure Ratio) = (Boost + 14.7psi) / (14.7psi)
So, let's work through an example:
Let's say we have an 80% efficient turbo, boosting at 14.7 psi (just to make things easy). That gives us a Pressure Ratio of 2.
Let's compare a cold air intake of 70*F (530*R) and a hot air intake of 120*F (580*R)
Pluging the numbers into the equation, we get a temperature rise of
CAI: 119*F
HAI: 130*F
So, in fact, the warmer the air your turbo is ingesting, the greater the rise in temperature of that air.
On the topic of intercooling, yes, the greater the temperature difference between the ambient air and the air flowing through the intercooler the more the air is cooled, but once again it is not a linear relationship. To get the coolest intake temps to the engine, at a set boost pressure, compressor efficiency, and with or without intercooling, you must get the coldest possible air into the turbo.
05-29-08, 07:27 PM
#28
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alright guys ive got a question, would it be possible to rig up an intake filter/cone/ whatever to where the stock intercooler sits? i mean to me it makes sense cause of the air coming in from the scoop, no?
05-29-08, 10:54 PM
#30
The problem is you would need to fab up a large rectagular tubing section to clear the hood and the top of the throttle body/manifold. Then getting it to neck down to the 3" round opening on the AFM would require some creativity in the limited space. I thought about trying it on my car (NA with a TII hood), but the whole "ram air" effect is worthless anyway.
05-29-08, 11:17 PM
#31
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Here's why, 100% efficient gas compressors raise the temperature a set amount. Because there's no such thing as a 100% efficient gas compressor in the real world, that doesn't happen. Compressors that have less than 100% adiabatic efficiency heat the air on a curve, the warmer the intake air, the greater the rise in temperature.
05-29-08, 11:25 PM
#32
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Because there's no such thing as a 100% efficient gas compressor in the real world, that doesn't happen.
Compressors that have less than 100% adiabatic efficiency heat the air on a curve, the warmer the intake air, the greater the rise in temperature.
BTW, do you have the actual curve plotted, or are you ASSUMING this is the case?
-Ted
05-30-08, 03:27 AM
#38
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look at this mock up...
GM hummer H2 air filter going to a 4" opening for my turbo!
pretty sick, screw those cheap cone filters or Greddy or HKS little filter elements this thing is huge so its got a ton of filtering area. I doubt anybody has thought of this one.
just thought I share this, I didn't have anything else to do today
anyhow that is not how its going to end up, I decided to keep the paper element box but put it next to the turbo with a small elbow, that stuff of having it go over the hose and over the fan was just a test.
GM hummer H2 air filter going to a 4" opening for my turbo!
pretty sick, screw those cheap cone filters or Greddy or HKS little filter elements this thing is huge so its got a ton of filtering area. I doubt anybody has thought of this one.
just thought I share this, I didn't have anything else to do today
anyhow that is not how its going to end up, I decided to keep the paper element box but put it next to the turbo with a small elbow, that stuff of having it go over the hose and over the fan was just a test.
01-03-10, 05:01 PM
#43
Rotary Enthusiast
Thread Starter
87 t-66 old thread it is... nanaimorotard Geez I never installed that thing... what a way to revive an old crappy post...
BTW car is running great. Just uploaded BDCs timing maps.
BTW car is running great. Just uploaded BDCs timing maps.
01-04-10, 08:59 PM
#47
Rotary Enthusiast
Thread Starter
I guess you cant hide old posts in this forum.. hahahhaa
BTW bumper melted with the engine fire right after it grenaded itself while boosting 43.4 psi according to the megasquirt logs. H2 hummer filters tend to do that yo!
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