Torque curves/HP peaks with boost
Thread Starter
Teching In
Joined: Sep 2014
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From: Floral city, Florida
Torque curves/HP peaks with boost Got into a discussion with with a friend recently to do with turbos vs superchargers on LS series engines. I'm looking to see dnyo sheets of turbo AND pro/supercharged LS engines out there. Trying to compare the power curves the two produce.
Also PROFESSIONAL / PERSONAL experience, with which route is more friendly to lower 1/4 mile times.
Also PROFESSIONAL / PERSONAL experience, with which route is more friendly to lower 1/4 mile times.
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Joined: Mar 2014
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From: Ohio
Depending on the setup and type of supercharger, the curves can look identical. The curves only begin to look different when you get people slapping together builds that might not be optimum.
Like the guys on here that buy a 2500 dollar 88mm turbo and barely run 9s lol
Like the guys on here that buy a 2500 dollar 88mm turbo and barely run 9s lol
I have no dyno sheets to show but I have been involved in quite a few turbo and procharged cars. one main difference is procharged/supercharged cars build boost with rpm. when there is no belt slip they will build more and more boost up to the shift point. the beauty of a turbo is the ability to get full boost at lower rpm making more torque down low in the rpm than a mechanically driven blower/supercharger. this is why you see turbo cars with highway type gears running good.
im sure there will be some dyno sheets coming .
im sure there will be some dyno sheets coming .
Thread Starter
Teching In
Joined: Sep 2014
Posts: 10
Likes: 0
From: Floral city, Florida
I have no dyno sheets to show but I have been involved in quite a few turbo and procharged cars. one main difference is procharged/supercharged cars build boost with rpm. when there is no belt slip they will build more and more boost up to the shift point. the beauty of a turbo is the ability to get full boost at lower rpm making more torque down low in the rpm than a mechanically driven blower/supercharger. this is why you see turbo cars with highway type gears running good.
im sure there will be some dyno sheets coming .
im sure there will be some dyno sheets coming .
A procharger curve is gonna look very similar to an N/A curve because of the progressive nature of boost production.
A turbocharger curve can vary with set up (as mentioned above). It will greatly depend on how the boost curve is shaped. Saying that, a typical turbocharger curve that spools the turbo good is going to be a lot flatter.
A turbocharger curve can vary with set up (as mentioned above). It will greatly depend on how the boost curve is shaped. Saying that, a typical turbocharger curve that spools the turbo good is going to be a lot flatter.
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Restricted User
Joined: Mar 2014
Posts: 7,192
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From: Ohio
That doesn't always hold true.
-A small displacement engine with a big turbo will look more like a centrifugal blower curve.
-A centrifugal blower with a small pully and a wastegate will look like a properly sized turbo curve.
-An undersized turbo curve will look similar to a roots and sometimes twin screw curve. It will build boost very early and have a flat torque curve before falling off like an average roots on a small cam.
And then you have to start factoring in camshafts which can play a huge role in the shape of the curves of any of these, causing power to climb high and peak late or peak early and fall off.
Long story short, any type of forced induction can be designed to mimic the power curves of another. Even nitrous on a multi-stage controller can confuse most amateurs.
A proper sized turbo should build boost much sooner than a centri blower and produce more mid-range, when compared to a normal centri blower setup at similar boost levels. The curves typically look different, but to say they always do/will is a mistake.
-A small displacement engine with a big turbo will look more like a centrifugal blower curve.
-A centrifugal blower with a small pully and a wastegate will look like a properly sized turbo curve.
-An undersized turbo curve will look similar to a roots and sometimes twin screw curve. It will build boost very early and have a flat torque curve before falling off like an average roots on a small cam.
And then you have to start factoring in camshafts which can play a huge role in the shape of the curves of any of these, causing power to climb high and peak late or peak early and fall off.
Long story short, any type of forced induction can be designed to mimic the power curves of another. Even nitrous on a multi-stage controller can confuse most amateurs.
A proper sized turbo should build boost much sooner than a centri blower and produce more mid-range, when compared to a normal centri blower setup at similar boost levels. The curves typically look different, but to say they always do/will is a mistake.
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