I need to take a diesel course!
How much boost is too much boost?
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Thanx Kris and Clux. I got what you are saying. My point was that we will all benefit with a cooler charge waiting to be jammed into the cylinders. However that happens, less restrictive exhaust, better intercooler, more efficient turbo, whatever.
All of us can appreciate that a more efficient turbo will move more air with less restriction. To a point. The engine displaces what it displaces and will only pump so much air regardless of turbo numbers. So between intercooler and pipe sizes and efficiency numbers, there exists the ideal world.
So that brings us back to the original thought. More power with less boost. Yes it can happen. Does it require a new turbo? Maybe. But I think a better intercooler will provide most with the best results. I think if you go the other way first you're just going to superheat the air like Kris mentioned. If you can spring for both, well giddyup. JMO
All of us can appreciate that a more efficient turbo will move more air with less restriction. To a point. The engine displaces what it displaces and will only pump so much air regardless of turbo numbers. So between intercooler and pipe sizes and efficiency numbers, there exists the ideal world.
So that brings us back to the original thought. More power with less boost. Yes it can happen. Does it require a new turbo? Maybe. But I think a better intercooler will provide most with the best results. I think if you go the other way first you're just going to superheat the air like Kris mentioned. If you can spring for both, well giddyup. JMO
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
in a naturally aspirated engine, 14.7 pounds of pressure is pushing on the air that is entering the cylinders. now say if you just happen to be running 15 pounds of boost for some coincidencial reason, you have twice the amount of air pushing on the cylinder. so this SOUNDS to me like about twice as much air is being stuffed into the same place, right? and that just multiplies to three times the pressure with 30psi of boost. then you have 3Atm pushing on the cylinders. now when it's time for the air to leave the cylinders, that same air is going out of the cylinders, twice or three times as fast as a N/A engine, because there is ^2 the pressure in the cylinder. multiply this by eight, and then compound the fact that the gas pulses help spin the turbo faster, which in turn stuffs more air into the cylinders, which turns the turbo faster yet, and you can start to see one of the aspects that spool the turbocharger up. there are several other factors such as blade pitch and curve that i wont get into. 
Thread Starter
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Smokin
Joined: Jun 2006
Posts: 8,849
Likes: 0
Originally Posted by Tenn01PSD350
WTF is all that Kris? I'm currently taking pain meds for my back and it's late. I guess I better read that again in the AM. Pitch and curve eh? I'll have to get back to you.
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
uh, um, thanks. i guess i pay attention in class more than i think..
if you didnt know, the turbine wheel blades are curved. helps accelerate the turbine wheel faster as exhaust passses past them. they also have a pitch, just like the intake wheel.
that is why i didnt want to stick a screwdriver in there to do my wicked wheel.
if you didnt know, the turbine wheel blades are curved. helps accelerate the turbine wheel faster as exhaust passses past them. they also have a pitch, just like the intake wheel.
that is why i didnt want to stick a screwdriver in there to do my wicked wheel.
Last edited by PowerstrokeJunkie; Jul 23, 2006 at 10:02 AM.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Originally Posted by strokin_it7.3
uh, um, thanks. i guess i pay attention in class more than i think..
if you didnt know, the turbine wheel blades are curved. helps accelerate the turbine wheel faster as exhaust passses past them. they also have a pitch, just like the intake wheel.
that is why i didnt want to stick a screwdriver in there to do my wicked wheel.
if you didnt know, the turbine wheel blades are curved. helps accelerate the turbine wheel faster as exhaust passses past them. they also have a pitch, just like the intake wheel.
that is why i didnt want to stick a screwdriver in there to do my wicked wheel.
I understood that you were describing turbo design principles but it seems ya just trailed off at the end. I guess you were getting at the optimum design that would result in a 1:1 drive ratio. I wouldn't dare debate turbo theory with you as I am not as well versed as you. So keep paying attention in class and by all means keep sharing. Great info, as usual, and I'll cut back on the pain meds.
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