Wednesday, March 29, 2023

Why More Boost Doesn't Always Mean More Power

Main Why More Boost Doesn't Always Mean More Power

Viewing 37 posts - 1 through 37 (of 37 total)
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    Why Do Two Engines With Equal Turbo Boost Make Different Power? How does elevation affect a car’s performance? NA vs Turbo Subscribe for new videos …

    Engineering Explained

    Additional comment about humidity! I spoke with a Ford engineer about how humidity affects horsepower. He stated that humidity acts like EGR. For example, combustion with 1% water by mass (not to be confused with relative humidity percentage) is equivalent to using about 1.7% EGR. As humidity increases, you increase your mass flow rate, which increases heat capacity, which causes cooler combustion and reduces combustion pressures.


    It's called dynamic seating. It's an awesome AMG option. Been around for decades.

    Dai Bennett

    Bit like having a bigger manhood doesn’t really mean better lol


    WOW smart cookie BUT silly driver waving his hands around …………….keep both hands on the wheel .ALWAYS !!!!

    The Hundredth Monkey

    As someone who drives and even rides a motorcycle in Oregon, I can confirm most Oregon drivers are terrible, just as bad as Cali and Wash drivers.

    Commenter Person

    4:30 Hey hey hey! Take it easy on Oregonians. 🙂

    Ben SMITH

    i stopped when he said noone in oregon knows how to drive…. i assume he didnt include himself despite also being in oregon…?


    Fun fact: the first person to drive a car, did not use turn signals

    Ded Beet

    Great video, but why is the light on above the rear door the whole time? OCD on overdrive….

    Gary Moore

    Where are your videos filmed? Nice scenery!

    richard bohm

    your explanation is excessively complex. remember that boost pressure is also known as back pressure. two engines of equal displacement will make the same power if all parameters are equal, ie same port flows, exhaust efficiency, cam timing, intake efficiency, etc. however if one engine has less efficient port flow, then you lose power due to higher back pressure in the intake system.

    Spencer Evans

    that car is not going to hold up over time AT ALL!

    Jake S

    so there is no replacement for displacement

    Macht Schnell

    So are the turbos dual scroll like the BMW?

    Sean Porter

    Came back to Oregon for this one, eh?


    The assumption was 100% VE to start with, which is a theoretical target for max power. Maximizing the VE would be another step in increasing mass flow rate for same boost and displacement, increasing power. Includes porting, chamber shape, exhaust & intake systems, etc. If you have 1 psi pressure drop in an intake system (some stock systems), your ambient pressure in this EE case would be 13.7 psi, a 7% power loss w/o turbo. !


    The GT Four Door is beautiful! Love those monoblock style wheels too.

    J. Geshua

    Car looks good wheels are hideous and just confirmed that bigger it's better… bigger engine crams more air in and bigger turbo makes sure the air goin in its cooler air more o2 particles. Good stuff bro

    Bigtruckseriesreview Motorsports



    Turbo system is bullshyte!! Superior system is Supercharged engine!

    gavin nall

    Pressure across the engine is also a factor with a turbo that is to small


    Those are the ugliest rims I've ever seen


    I am sitting in a '94 Toyota Celica with a 2JZ engine that can blow the doors off of your "BITURBO"


    Yuck @ those wheels.


    Thats not quite how I remember the beating my Turbo Buick Grand National took

    Jarrod Hill

    My only takeaway from this video is that I need a bigger turbo😎

    Nicholas Chriss

    I was wondering about longevity of the turbos in this "hot V" layout. Would that be detrimental to their service life of the bearings etc?

    Terry Myers

    For a given engine size and boost (pressure) the air can be a different temperatures due to engine designs affecting the molar percentage of oxygen which is ultimately required for more combustion and thus more power. There, saved you 12minutes.
    The bit about humidity and elevation is irrelevant because the problem is still understood as identical size engines with identical boost breathing the same air at the same temperature and the same elevation..etc


    Rather simple concept; 'boost' as in pressure is the measure of restriction just like impedance for electricity, ohms, ideally you want low boost high volume meaning lbs/cuft or g/s. More volume of air more volume of fuel = more power (typically).

    Matthew Mohri

    I am going to go out on a limb and I am far from an engineer but if the combustion engine(which is essentially is a vacuum mixed with air, fuel, and fire/spark)doesn't have proper flow through the entire intake and exhaust system(cat back, turbo back, down pipe, etc. you know what I mean)then it's going to make less power despite tons of boost. Like for example one of my favorite engines b/c though its(head 15 degree 12v)not the best flowing engine, if you do a proper P&P, BVH and Cams, you can run 12lbs. of boost on the engine and make anywhere from a conservative 30+whp to 60+whp on a 12v VR6 that had the same turbo or S/C set up but didn't have the higher flow. However do people who d boost applications ever go this extra mile with head work and cams? Usually not but when you're from the 12v VR6 15degree angle head family most try to do at the very least a P&P with cams.(Expensive as hell b/c you literally have to look at head work in an entirely new way)Isn't this why people port Super Chargers so they can get more air flow? Plus if you can't keep the proper cooler to the engine you're not going to make as much power.

    When you talk about the air going into the engine do you speak of its temp as well? I am guessing that in a N/A Engine the temp of the air isn't as big of a factor(still a big factor)as a turbo/supercharger application. So heat obviously has a factor on air density hence why people use intercoolers but you can have too big of an intercooler so it's important to fit the right intercooler to the right turbo?

    EnEm Gee

    why? cuz vtec


    on 5:47 you mean same volume, not the same mass. Right?

    Volvo Brad

    0:39 Damn son that's clean


    Any chance of reviewing a 1L turbo engine?


    Unless it's F-Zero, then YOU'VE GOT BOOST POWAH!!!

    Adrian Joshua

    PV = nRT !!!

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