turbo vs. super, please input! Options

[m0dd3d1]

so what kind of power and torque differences can i expect with a supercharger instead of a turbo with my 98 gt? any input is very appreciative!

[NuclearHappineS]

I owned a custom turboed car, a stock twin turoed car, and a now a supercharged car

reliability : supercharger > turbo
reason: 1 fixed boost level, 1 level to tune at, less complex boost, simpler (or self contained) oiling system, simpler control/fueling systems (no wastegates, boost controllers...etc)

power: turbo > supercharger
reason: variable boost level, racegas+moreboost+more timing option, infinitely adjustable setup (for low end or top end)


Lag is overrated... the VR4 (stock TT) could hit FULL boost @ 2300 rpms ...
Most newer S/C cars are not allowed to boost (although they are capable of making boost) before say 3k (that's how my car is) because that improves fuel effeciency ...

the mazda speed supercharged miata was like that too ... they wanted torque delivery to be linear so boost is regulated at low rpms

here's the thing

what's the point of having a 1000-4000 rpm boost band, when you have a 3000-6500 power band (as determined by your gearing)... superchargers (blowers specifically) can make boost at idle but their effeciency drops with rising CFM, rising supercharger rpm and rising boost)

example: my eaton m45 on the benz 1.8 litre consumes 30HP at redline
The supercharger temps @ redline are 25 degrees higher than they are at low rpms, and it's limited to a 10psi output (effeciently) at those rpms otherwise the temps shoot up even higher..

a properly sized turbo on teh same motor, with a good intercooler , can be at peak effeciency at redline @ 15psi ... i'd gaing 30hp in supercharger drive, the same outlet temps, and 5 more PSI of boost which translates to some 80 hp more than i have now

that's the difference between a 200hp and a 280 hp setup on a 1.8 litre

which one is better now ?