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Old 11-21-2006, 02:22 PM   #1
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Perform. characteris. b/w Turbo & S/C??

Hi All,

I'm a new member here and relatively new to Canada as well (from Australia).

I want to pose the question to those running either turbo'd or S/C'd E30's.

Im well aware of the mechanical diffferences between the Turbo and S/C concept but wanted to find out first hand, what difference in performance characteristics are they?

E.g S/C running 7psi compared to a Turbo running 7psi, are we talking same/similar output?

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Old 11-22-2006, 08:30 AM   #2
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Look up supercharger then look up Turbo.
"They say ignorance is bliss..... I don't know what the Fu*k that means but I'm pretty happy". Ricky Trailer Park Boys.

Current Mods....X-Brace, Stromung Cat Back Exhaust, 17/225/45 M3 Replicas, HotBits Adjustable Coil Overs, 40% LSD 3:91 Diff, E30 Gearbox, Boosted.
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Old 11-22-2006, 08:50 PM   #3
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both will put out around the same numbers in terms of HP, the turbo may have a bit more than the SC but in terms of torque the turbo should have a substancial amount more than the SC only because the SC uses engine energy to drive the unit itself. the turbo system is more efficient this way.
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Old 11-23-2006, 11:07 AM   #4
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The main difference will be the power made under the area of the curve which can be seen on a dyno chart; Turbo's generally have a broader area if you are comparing this to a vortech s/c. Turbo sizing is also a variable that will effect the power characteristics @ 7psi.

I've rode in both setups. The power delivery on a vortech s/c setup feels more linearly while in the turbo setup, it has a nice 'torquey' feeling once boost kicks in. I have yet to ride in a Positive Displacement (or twin screw) s/c setup, however it will probably feel like the turbo setup but with no lag.
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Old 12-01-2006, 09:40 AM   #5
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Originally Posted by 328DTM
I have yet to ride in a Positive Displacement (or twin screw) s/c setup, however it will probably feel like the turbo setup but with no lag.
A PD setup doesn't feel like it's supercharged, it just feels like a larger naturally aspirated engine. That's why I like them so much
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Old 12-01-2006, 04:17 PM   #6
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The supercharger feels like a bigger displacement motor. Which means there is no lag.

I have raced an Turbo M3 with my Supercharged M3 a few years back. From a roll I got a 1/2 lead by the time we hit end of 3rd he almost made up the loss.
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