Okay, kind of a odd question about FI, but please step inside to add your 2 cents...

What would be the advantages/disadvantages of running a Supercharger AND a Turbo on the same car? Has this been done before? What would the boost look like if the one was forcing air in, and the other was pulling air out? There's probably a lot of reasons this would not be doable, but I thought I would throw up the question to see what you guys had to say.

ummm k il throw in my 2 cents. we have HUGE 2 stroke diesels on these 10 ton trucks that we use and they have a roots supercharger and a turbo too. in my experiances i have seen both supercharger and turbo go bad at differnt times and also once both went to the gutter at pretty much the same time. what the supercharger does is make up for what the turbo cannot do at very low RPM therefore keeping low range torque, the turbo makes up for what the supercharger cant do at the upper RPMs to keep the torque and power up. i know it works like this b/c i have test drove these trucks when the operator has said "truck is a dog untill the engie revs kinda high" or " i have plenty of power when im cruising around but when i give it full throttle it goes until a certin point and seems to lose power". you can clearly feel when the supercharger is taking a crap b/c the engine will either have crapy lower power/tq and the engine seems to run crapy until you give it throttle, when the turbo goes out the engine seems fine until you give it some power and it seems to not wanna rev fast and has no nuts over 1/2 way through the RPM range.

for a normal car this has been done before and works pretty good BUT its kinda pointless unless you plan to make like a bazillion HP at like 1k-7k.

Does anyone know if this has been done to a 4th gen?

this is stupid
thats my .02 cents

The P-38 fighter planes in WW2 used a supercharger and a turbocharger very effectively. They beat the pants off the German Luftwaffe.:)

VW is coming out with a twincharger engine next year, so it's obviously doable on a normal gas engine. Now, this is on a very small car the will benefit greatly from both methods. With a 4th gen though, the engine is potentially so strong that you aren't really left with a hole in your powerband if the engine is designed with that particular FI method in the first place.

twincharging is doable, but its kind of pointless when youre using both centrifugal superchargers and turbos. if you could somehow mock up a magnacharger or eaton roots, then itd be more beneficial

twincharging is doable, but its kind of pointless when youre using both centrifugal superchargers and turbos. if you could somehow mock up a magnacharger or eaton roots, then itd be more beneficial
What he said.:)

The P-38 fighter planes in WW2 used a supercharger and a turbocharger very effectively. They beat the pants off the German Luftwaffe.:)

Actually they just used Turbochargers on the P-38's. I recently did research on them.

Actually they just used Turbochargers on the P-38's. I recently did research on them.

no..

http://rwebs.net/avhistory/images/_geturbo/ge_fig9.JPG

yes..I know thats not a -1710-143/145(G6R/L) ....but thats how it was setup, we sold the britsh a bunch of P38s sans the turbocharges and the the counterrotating engine..

Looks like the TurboSupercharger, is pretty much a Turbo though in the pic. :) If you want I can reference the site where it gave the info I found about having just a Turbocharger, but it looks like they are calling the Turbo a TurboSupercharger, when it is doing the work of a Turbo.

Looks like the TurboSupercharger, is pretty much a Turbo though in the pic. :) If you want I can reference the site where it gave the info I found about having just a Turbocharger, but it looks like they are calling the Turbo a TurboSupercharger, when it is doing the work of a Turbo.

The turbo is driven off the exhaust gases and the internal supercharger is driven off the crank.:)