Supercharger vs Turbocharger - Hemi Truck Club
 
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Old 10-06-2018, 09:59 AM   #1
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Supercharger vs Turbocharger

This is what everyone wants to talk about when it gets right down to it. A quick check on the internet will tell you that the turbo is more efficient than the supercharger. And we all know if you read it on the internet it has to be true. With the main argument being the supercharger is driven off the crank robbing horsepower while the turbo uses spent exhaust gases to spin the turbo costing nothing. I disagree with the conception that the work the exhaust gases is free. Being a old guy I learned a long time ago nothing is free and putting that exhaust to work changes the exhaust flow characteristics all the way back through the engine including the intake manifold, charge tube IC and turbo. With the main difference being the camshaft design with minimal overlap in attempt to prevent intake contamination while maintaining smooth high velocity flow through the engine. Some other things are the higher temperature intake charge and boost lag. Obviously boost works, and with a supercharger the engine is built to enhance the characteristics of the supercharger which is given boost at a certain rpm. The supercharger camshaft has a higher exhaust duration allowing gases to flow for a longer time and overlap promoting cleaner fill. Exhaust gases are not subjected to constant pressure changes. And even though tuning a street exhaust system is a bit of a reach it isn't unnecessarily restricted by having a turbo blocking it. A supercharger will build boost in the charge pipe at partial throttle allowing boost to be present instantly with the opening of the throttle body. A supercharged engine runs unrestricted utilizing boost to make maximum HP with good manners. A turbo has a cool whistle... Bring it on...
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Old 10-06-2018, 10:48 AM   #2
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Old 10-06-2018, 11:36 AM   #3
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Turbo for the WIN, Look at all those top fuel and Funny cars that run twin turbos...….Wait, I'm being corrected , ...hold on......My bad apparently the last successfully turbo top fuel car was never....

Seriously, As much as I love a raging G2 based 526CI with a BDS on top making just shy of 3500hp on C16, and 4900on Nitro (try that with a turbo...the nitro part)
for the street driven crowd turbo's are the deal for bang for the buck, easier drivability....and with the computer control and CO2 operated waste gates , they react quicker to running changes than the blown application setups, with the Procharger and Vortex type set ups you can get close, but because the Turbo is running off of spent gas, you can remove the "power sourer" quicker.A roots style system, it's full steam ahead, only control is timing and fuel map....but the PSI boost is still happening,
If we look at it this way, the Turbo can bleed off more HP/TQ to react to track conditions, which is why they do so well at some of these "outlaw events. you can tune a NOS car just as easily, but you can't aply the power adder as softly as you can with a turbo....I guess the point I'm trying to make here is a turbo set up because of it nature can add and remove power in slower,faster and smoother increments than a blown application can, hits the tires softer, less disruptive to the whole package, reacts faster to throttle input at speed

With the Procharge/Vortex set up you can pull timing and fuel map and use a BOV , but it's more like a bull in a china shop because the boost comes from a mechanical(engine speed) source instead of a pressure source.


Give me Roots type for Power, but if the track conditions suck , it's easier to go A-B with a turbo....
For me I'd rather be blown than use a hair dryer
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Old 10-06-2018, 11:40 AM   #4
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Quote:
Originally Posted by Redtruck-VA View Post
A turbo has a cool whistle... Bring it on...
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Old 10-06-2018, 12:01 PM   #5
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Quote:
Originally Posted by ric3xrt View Post
Turbo for the WIN!

for the street driven crowd turbo's are the deal for bang for the buck, easier drive-ability.... because the Turbo is running off of spent gas, the Turbo can bleed off more HP/TQ to react to track conditions, you can't aply the power adder as softly as you can with a turbo....I guess the point I'm trying to make here is a turbo set up because of it nature can add and remove power in slower, faster and smoother increments than a blown application can, hits the tires softer, less disruptive to the whole package, reacts faster to throttle input at speed

100%!!! Turbo setups usually get better gas mileage too as long as you keep your foot out of it. Sometimes that's hard to do....


It does boil down to what that persons preference is for his truck. Either way, it's awesome to have boost.
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Old 10-06-2018, 12:34 PM   #6
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I like the control I have with the supercharger. Using the cog drive is a different animal then when it was driven with the serpentine belt. The serpentine belt slipped while accelerating or any relatively quick engine speed charge. This cost redline boost and made partial throttle changes inconsistent. This varying inconsistencies I "think" has the feel of a turbo system. The cog drive for me is all good. As low as 2500 rpm I have boost being built in the charge pipe controlled by the TB opening. I can vary the throttle opening and control boost. Go wot and roll up the rpm to 15psi and then backout a little and roll down rpm and boost as long as it doesn't create 8psi vacuum. Any more than 8psi vacuum and the bov will dump. I can cruise at 2500+rpm going up and down hills and the bov can be heard venting the charge pipe. Supercharger is simple to install, but with that said really comes into it's own with cog drive.
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Old 10-06-2018, 02:35 PM   #7
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I 100% agree with everybody....... For a street ride I think it's more personal preference with the ease of making more HP the easiest way. Even if somebody decided to throw nitrous oxide in the mix that's a pretty good alternative to..... I think you need to decide whether you want a street car or a track car..... Boost is Boost no matter how you look at it.... To be perfectly honest I think a blower sitting on top of the engine beats all for bad *** looks...
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Old 10-06-2018, 10:53 PM   #8
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The way I look at it superchargers roots or centri are great for low end grunt and light to light fun for sure. Turbo has some lag but when it hits hold on and on the street it is tons of fun much like my blower setup was bit with 80% better boost control. Now this control also comes from the exhaust housing you run to small and the thing will be boosting all the time to big and you get a lag monster. I have a turbo now and like it a little better than my blower setup but one thing I do miss a little is that instant bottom end now I have a wot wait ok hold on lol.
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Old 10-07-2018, 04:59 AM   #9
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With a turbo, you can adjust the boost pressure to what you want with a spring change or boost controller. Lower boost for the street. Raise up the boost for the track. You can adjust when and how your turbo spools up by the exhaust/boost piping size or length. A turbo setup can be fine tuned to exactly the way you want it to boost. I call it the "compressor tank affect". Spooling too fast. Install more exhaust/boost piping. Want the turbo to spool up a little sooner. Reduce the exhaust/boost piping length. Example, my 03 qc. She's a heavy old girl (5752lbs) with a mild 348 engine. Needed the boost to come in quick as possible to get her moving.

But, you must have the correct size turbo first to what your building.
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Old 10-07-2018, 07:22 AM   #10
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The supercharger makes for an easy install with no need to modify the exhaust. It runs in a direct relation to engine speed. Yo pick the engine tq peak and select the pulley combination that will spin the sc at it's optimal speed at that rpm. The only hardware necessary is a BOV. The blow off valve opens when the throttle blade closes preventing a pressure shock wave from damaging the sc. The BOV operates using a spring that's rated to vacuum pressure ie 8, 10 12 psi vacuum. It will remain closed until vacuum exceeds the spring rating and then open dumping boost from the charge pipe. On redtruck it idles pulling 8-10psi. Using a 10psi spring holds the BOV closed until the throttle blade closes drawing a vacuum higher than 10psi when being driven. It does make a swish noise as it releases the held boost in the charge pipe.. Nothing else is really needed until you exceed 8-10psi boost. Then you can add a intercooler and water methanol injection to reduce inlet charge temperature allowing a more aggressive tune better utilizing boost. Turbo's have much higher underhood inlet charge temperatures requiring IC, water/meth at lower boost levels that also often requires timing to be pulled..
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