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#1
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supercharging vs turbocharging
I am interested in hearing opinions on the pros and cons of supercharging vs turbocharging with reguards to a smallblock in a 70 Challenger.
This car will be mostly street driven. Most crusies will be about 100 mi. There may be an occasional vacation run of 300 miles round trip for the weekend. Interstate driving as well as state roads. I live in North Carolina if atmosphere is of enough diff. to consider. I think I want to run a duel plane with a single carb and probably a low compression 360. A later question will be reguarding a the same stats but with a 6.1L enging (same car and useage) Total cost. Maintaince. Fueling at BP, Citgo,Sheets, or any other "side of the road anywhere gas station". Ive never done metal fabrication but I have done some screw turnning and part upgrades (transmission, intake, carb) Thanks for any input. I have missed the forum!!!!!!!!!!!!!! Chris 70 Challenger 09 SRT Challenger |
#2
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I think blowers(roots supercharger) are better because the power is constant. no spooling. Also is farely simple to detune for economy and engine life or overdrive for power. such could be good for the poster in particular for switching from touring to street/strip. blowers also don't heat the air as much as turbos do. The roots do need surfaced occasionally on newer blowers(the Teflon wears off). Also blowers weigh more but not much. There are sbm applications for single carb roots supercharger out there for 3-4 thousand $$ new not including carb.
As for turbos you pretty much need twins with diff power ranges and coolers to even be comparable. there is a lot about turbos that I don't know so look for yourself but this is as I understand it no idea on cost. John 65 barracuda sb 67 dart 270 sb 68 dart gt sb 70 dart swinger sb 70 sattelite bb 65 belvedere sb |
#3
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I Vote turbo.
I drive a PT Cruiser GT and while I understand it isn't that comparable. I do know that with a properly set up turbo system lag doesn't exist. However I'd say you'd probably be happier with fuel injection on the turbo side. Also you need to find a good shop to help whichever way you go.
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#4
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A blower will cost mileage all the time and a turbo is low losses at light throttle. You need lower compression if you run any big boost numbers. don't even think you are going to run boost numbers like the diesel guys can!
10-15 is a lot of boost for a gas engine. Diesel can run much higher. mine is set at 52 lbs.l |
#5
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5% savings on fuel consumption (on ave) with roots blower says the manufacturer. more or less on how you drive and how the blower is set up.
if your small block has a normal carb on it you can put a roots blower on it no prob. unless you have efi a turbo won't work through a normal carb without realizing the internal an external pressures (see Paxton auto web sight to see one solution to this). some demon carbs will work I have read on Paxton websight they put one on a 440 and blow into it with a belt driven turbo. Paxton sells entire kits for belt driven turbos for diff engine makes and sizes. |
#6
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Belt driven would be a supercharger.
Exhaust driven is a turbo charger. |
#7
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Actually they are both superchargers. I was refering to a centrifugal blower(supercharger ) as a belt driven turbo. Paxton is known well for many different industrial and automotive centrifugal blower allocations including BELT DRIVEN TURBOs. Check them out online or something. they're pretty cool.
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#8
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On a small block there wouldn't be that much lag, but lag depends on how big a turbo you are using too. Plus you can run a single turbo and you can use factory exhaust manifolds and just make a Y to go to the turbo. The nice thing with turbos is you can change boost without having to change a pulley, just need a manuel controller or electronic and control it from inside your car. Plus belt driven blowers use power to make power, turbos you use the engines gases just redirecting the exit. Lag is caused by size of turbo in comparison to the volume being pushed to spin the exhaust wheel. I had a srt4 neon with a 60-1 turbo and my spool time was only 3200, but my volume was lower due to smaller pistons. If you were to run a 50trim turbo, and have all 8 cylinders pushing air you'd have instant spool.
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