Supercharge Or Turbo Lt1
Well the problem is that a lot of people come on and "Guess" at how things should work. The ones that actually have the setup's are the ones to talk to..I will still have people call BS on certain things that they have never had...
Boost hits harder with a turbo setup because it is all in at once.
Supercharger appears to hit harder because you are in boost as soon as the pedal goes down. Example
S/C car boost curve with 12 psi pulley
2000rpm ... 4psi
3000rpm ... 6psi
4000rpm ... 8psi
5000rpm ... 10psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you instantly have 10psi
Turbo car boost curve w/wastegate @ 12psi
2000rpm ... 4psi
3000rpm ... 12psi
4000rpm ... 12psi
5000rpm ... 12psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you will not have any boost until the turbo is spooled (could take a second or two - known as lag), but then all 12psi rushes in fast.
Obviously this is just a generic example exaggerated to help show the difference. In summary:
Turbo's boost hits harder and the full amount of boost comes in quicker. The S/C is driven by a belt, so full boost doesnt come in until you reach the max rpm. However, the boost is instant and linear, so whatever rpm you romp on at, that equivalent boost is instantly available (thus appearing to hit harder on the street).
Supercharger appears to hit harder because you are in boost as soon as the pedal goes down. Example
S/C car boost curve with 12 psi pulley
2000rpm ... 4psi
3000rpm ... 6psi
4000rpm ... 8psi
5000rpm ... 10psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you instantly have 10psi
Turbo car boost curve w/wastegate @ 12psi
2000rpm ... 4psi
3000rpm ... 12psi
4000rpm ... 12psi
5000rpm ... 12psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you will not have any boost until the turbo is spooled (could take a second or two - known as lag), but then all 12psi rushes in fast.
Obviously this is just a generic example exaggerated to help show the difference. In summary:
Turbo's boost hits harder and the full amount of boost comes in quicker. The S/C is driven by a belt, so full boost doesnt come in until you reach the max rpm. However, the boost is instant and linear, so whatever rpm you romp on at, that equivalent boost is instantly available (thus appearing to hit harder on the street).
TECH Resident
Joined: Jul 2007
Posts: 749
Likes: 1
From: Spokane, WA
Boost hits harder with a turbo setup because it is all in at once.
Supercharger appears to hit harder because you are in boost as soon as the pedal goes down. Example
S/C car boost curve with 12 psi pulley
2000rpm ... 4psi
3000rpm ... 6psi
4000rpm ... 8psi
5000rpm ... 10psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you instantly have 10psi
Turbo car boost curve w/wastegate @ 12psi
2000rpm ... 4psi
3000rpm ... 12psi
4000rpm ... 12psi
5000rpm ... 12psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you will not have any boost until the turbo is spooled (could take a second or two - known as lag), but then all 12psi rushes in fast.
Obviously this is just a generic example exaggerated to help show the difference. In summary:
Turbo's boost hits harder and the full amount of boost comes in quicker. The S/C is driven by a belt, so full boost doesnt come in until you reach the max rpm. However, the boost is instant and linear, so whatever rpm you romp on at, that equivalent boost is instantly available (thus appearing to hit harder on the street).
Supercharger appears to hit harder because you are in boost as soon as the pedal goes down. Example
S/C car boost curve with 12 psi pulley
2000rpm ... 4psi
3000rpm ... 6psi
4000rpm ... 8psi
5000rpm ... 10psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you instantly have 10psi
Turbo car boost curve w/wastegate @ 12psi
2000rpm ... 4psi
3000rpm ... 12psi
4000rpm ... 12psi
5000rpm ... 12psi
6000rpm ... 12psi
So if you are rolling in 2nd and romp it at 4krpm, you will not have any boost until the turbo is spooled (could take a second or two - known as lag), but then all 12psi rushes in fast.
Obviously this is just a generic example exaggerated to help show the difference. In summary:
Turbo's boost hits harder and the full amount of boost comes in quicker. The S/C is driven by a belt, so full boost doesnt come in until you reach the max rpm. However, the boost is instant and linear, so whatever rpm you romp on at, that equivalent boost is instantly available (thus appearing to hit harder on the street).
). So the s/c really is more like an n/a engine on roids, it just has a different result than a lot of peoples (me included) impressions from dyno graph would lead one to believe without really thinking of the mechanics of the two. Yeah, boost definitely doesn't seem to be as cut and dryed of a mod as a lot of others. I know I want one of the two setups eventually. Just gotta decide which one
Ok that definitely makes sense. I forgot about that even at a certain RPM you wouldn't necessarily have the turbo fully spooled without nailing the throttle (correct me if I'm wrong. I'm in this thread for the same reason as the OP). So the s/c really is more like an n/a engine on roids, it just has a different result than a lot of peoples (me included) impressions from dyno graph would lead one to believe without really thinking of the mechanics of the two.
Ok that definitely makes sense. I forgot about that even at a certain RPM you wouldn't necessarily have the turbo fully spooled without nailing the throttle (correct me if I'm wrong. I'm in this thread for the same reason as the OP
). So the s/c really is more like an n/a engine on roids, it just has a different result than a lot of peoples (me included) impressions from dyno graph would lead one to believe without really thinking of the mechanics of the two. TECH Resident
Joined: Jul 2007
Posts: 749
Likes: 1
From: Spokane, WA
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How much boost are you seeing? Bob
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E-mail: brutespeed@gmail.comob@brutespeed.com
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ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
Pulley combo sizes are your friend, I pullied mine so the boost came on fast, at the track though I had to run 28" tall slicks so not to be past my desired redline. with a turbo you can control this with a BOV. I was supercharged and am now going Turbo, I will see all of the differences for daily driving and at the track, HP numbers since even though the engine has had a complete rebuild, I kept the same compression, heads, ect, Just switched to a turbo friendly cam..
Launching!
Joined: Jun 2008
Posts: 242
Likes: 0
From: Glen Rock, PA
A turbos boost pressure is controlled by the wastegate, not the blow off valve. The bov is used to relieve pressure from the lines during throttle transitions so the pressure doesn't go the opposite way against the turbo causing the compressor to slow down or stop.
Yup, You are correct, I was backwards...
