Quick Question

i have talked to a few local tuners about this and they didn't know. is it possible to have a supercharger and a turbo on the same engine, running at the same time. i had a thought while reading a magazine, i notised that turbos seem to raise the cars horsepower, and superchargers raise it's torque. so if you have a supercharger and a turbocharger you can keep the torque-horsepower equal. plus, wouldn't that end basicaly all lag because of the supercharger? then when the supercharger gets winded the turbo will have kicked in by then, right? i feel like a genieus, but for some reason i feel it won't work, i don't know much about cars so i'm hoping it's possible. it seems to be the only logical solution to FI. and if it is possible--can it be done on a porsche engine?

Yes, twincharging is possible. Back in the day, HKS offered a turbo kit that could be used on the 1st gen AW11 Toyota MR2, which already had a supercharged 4A-GZE engine.

By Porsche engine, are you referring to a Porsche car as well? The most recent Porsche turbos are twin turbocharged, and there probably isn't enough room in the engine bay with all that piping.

There was a picture on overboost.com which had both on it. The supercharger bolted on where the A/C was located.

yeah it is possible, have seen a few cars with it, but not woth it. The supercharger is a restriction to the turbo and thus if u are looking for high power then the supercharger will stop u from gaining it.
Turbos give huge torque too, not just superchargers.
They are basically the same thing, just spooled up differently.

phatdex,

I disagree, turbos wll not come anywhere near the torque of a supercharger, or I should say a ROOTS supercharger.

A roots and turbos would be the only set up that might work, since a centrifugal is basically a turbo being spun by the crank.

A small shot of N2O would be a better set-up, install a window switch for the low end, and cut it off as soon as your in full boost from the Turbos.

I dunno much about superchargers, but all the new luxury cars etc that are coming out turbo have like 900-1000Nm of torque with turbo setups.
Not saying turbos give more, just saying they significantly increase torque.

the basis of the question is can you use both b/c one does one thing, etc.

both will increase your hp and tq. you can't increase one without increasing the other, as they are directly related to each other.

the mr2 with the s/c and turbo had a bypass on the s/c at a certain rpm that let the turbo take over.

all in all, it's not efficient to run both. not worth it.

if you wanna up the power in your car, turn up the boost on your turbos. no need to run some wild setup.

The power you make with a turbo is almost always a trade-off. The more power you want to make, the longer it takes for the power to appear. Charger would be there from the beginning but it doesn't provide as much power potential as a turbo, so I think that is what people are thinking of when they say a charger increases torque and turbo increases horsepower. A charger increases torque (and thus power as, like said, they are directly related) on the low range, a turbo increases torque on the high range (depending on turbo size).

With both, or one small turbo and one big, you could increase torque on whole rpm range. The problem would be the complexity of a such system. For example the two turbo system, when the airflow would get to the maximum capacity on that small turbo, you would need to switch to the other. How are you going to direct the airflow as you can't flow it past the small turbo anyone. All kind of switches, valves, clutches to make it work. The simpler it is, the less problems you're going to encounter, a very complex system is hard to get reliable and most importantly efficient.

The latest thing now is an electrically assisted turbo. While there isn't enough exhaust gas to make the turbo spin, electric motor would spin the turbo wheels. When you reach the point where there is enough gas to overcome the electric motor, a clutch would disengage the motor and let gas do the work. Also a complex system, much more than it might sound, but we engineers can make anything work... ;)

thanks guys for all your info. you guys seem to understand what i was saying, the charger would help with no lag and then when the turbo is spooled it will take over. can't you just get a computer chip reprogrammed to operate the new system? would that new kind of turbo do basicaly the same thing? just instead of useing the crank it's a small motor? thats kinda like a supercharger/turbo just with out the crank being used. is that possible to do with a crank and have some kinda of clutch to disengage it so the exhaust can do the rest? hey, i have another question. i was telling my friend that awd is better than rwd, he said he likes awd more also, but on his gran turismo game on ps2 he always gets better lap times with rwd cars then with awd cars on every course. is there a method to this madness? logic would prove the awd a more worthy track car because of the grip it has. i was just about to call the prosche dealer and order the turbo but i called my friend so he could come over and we could burn out the tires for the hell of it on my gt2, then he told me "if you're looking for a better track car rwd seems to be better" and then he told me about his rwd sucsess. whats up with that?

I am not an Engineer, but I could make it work. I would have to overcome my lack of intelligence first though.:p

then he told me about his rwd sucsess. whats up with that? Its a game;)

in reality -for example- if there were a rwd and awd with the same engine and same wiegh and power. who would win? awd does have killer grip but rwd has less understeer. another question, how do you put those pictures buy your name on the left? and, with the pictures below your post, do you just attatch those every time you post?

Originally posted by RyNoSeRuS
in reality -for example- if there were a rwd and awd with the same engine and same wiegh and power. who would win? awd does have killer grip but rwd has less understeer.
It all depends...

Not all AWD setups understeer, my R32 with modified suspension tend to slightly oversteer. On a large track where you have very little turns or they are high speed loose turns, RWD is at advantage because it weights less (but this was nicked by your definition) and has less powerloss.

On high speed tight turns AWD has advantage because you can oversteer the car without losing speed like oversteer with RWD would cause. And when it rains of course.