no its not. Turbos increase VE by huge margins. a bit more displacement and a second set of valves does, but not to that degree.
Look at the BMW V12 in the McLaren F1. Supercar, a million Pounds Sterling, totally hawt car!! Its a 6.1 liter engine and tuned to the ultimate degree by BMW for McLaren. 627 hp and 480lbs/feet(Claimed crank hp, not wheel hp)
Now do the math on that with hp per liter.
now look at Lowells Laser engine. nearly 500 to ALL 4 WHEELS. That is the 627 CRANK hp of the BMW mill. And that is tuned by a very good professional tuner, yes, but NOT a BMW factory motorsport team of engineers and with all that comes with it.
Then do the math again, for hp and torque per liter. Why the HUGE difference? Hint: its shiny and snail shaped
It happens ALL the time.
Another simple example. BMW 328i cars in the E36 variety, mid-late 90s. Making a claimed 200ish hp over the variations. Dyno at about 175 or so. Put on header, chip, intake, full exhaust. Maybe break 200 wheel hp.
Add a turbo. Run ONLY 5-6 PSI. Yes, thats it. Torque jumps over 100lbs/feet and hp jumps 60-80 wheel hp! There is a great BMW tuner in Abbotsford that has a dyno and fabs thier own stuff, does thier own ECU tuning etc and its VERY common to see these numbers. I did a bunch of research on this subject as I amost bought one.
With the Suzuki example, yes the 1.3l twincam is a great engine and has more potential airflow vs the 1liter single cam 2v head engine NORMALLY ASPIRATED. And yes, with a few tweaks to the twincam, you will get more power, but the torque hardly will change.
Whereas with the forced induction wee 1.0 2v engine, you do exhaust, intake, bigger turbo(hell anything is bigger than the factory one), up the boost and fuel(if needed) and move the intercooler up front, and your torque would double. Maybe more. And the power would surpass the twincam car.
its like a Honda Vtec motor. Tons of power per liter, very well built etc. But look at the torque curve and torque numbers as well as area under the curve.
Look at a stock S2000(the early 2 liter car). Then look at JUST A BONE STOCK DSM engine. A bit down on power(simple and cheap to fix) 15 years older, lower tech. But way better area under the curve. Or look at an early WRX. Same displacement, similar power, but loads more torque. And huge area under the curve.
or a Mini Cooper and Cooper S(either supercharged or turbo) Not even comparable. One is a total slug, economy car feeling, gutless as hell. The other, far from it.
