Is it true that when you lowered your car you make it more faster stable and also saves fuel ?

lower to the ground the more air-o-Dominik it is so yes true not faster but can get through the force of wind ease fuel saved less air slowing Ur car down.

to a certain degree.

it lowers the centre of gravity of the car which therefore stabilizes it.

and it is also more aerodynamic because of the increased down force of the car which makes it faster.

It would only save a marginal amount of fuel.

No, lowering your car will only assist with lowering the center of gravity. There is no aerodynamic increase in downforce as the shape of the vehicle remains the same as when at the factory height; to increase downforce you would need wings and spoilers. As for reducing fuel consumption, again this is a no, since the drag coefficient of the automobile remains the same. One other point, while the center of gravity will be reduced, the ride will suffer. There will be less range of travel for the suspension and this will result in more harsh impacts even over moderate bumps. Be prepared to bottom out your suspension more frequently and depending on the wheel/tire combo and their offset, you might rub your fenderwells to boot.

It will go round corners a lot more sure footed without so much
lean so faster.
Only if your wheels and tyres will let you though.
Fuel saving? Doubtfull your going faster so using more.

Steve S pretty much hit the nail on the head. And depending on how you drop it, you my have nothing but a maintenance nightmare.

This is more of a “trade off” to look different than about anything else! And it all depends on the means used to lower car! Any suspension modifications can make a difference in stability as well as handling! Cutting off the coil springs to make car lower is not a good choice.- Although buying special designed “lowering suspension” components may not change things too much! Also when lowering suspension you generqally have to chang efront end alignment setttings from origional to get suspension to work right! And on independent rear suspension units there may be changes required also, as lowering it will probably make changes in the camber of axles! Camber is the relation of top to bottomn (angle) — as properly set up suspension is always a little wider separation at bottom than at top! Actually both ends are set up this way, — it helps prevent car from flipping over on hard turns!….. And true — if done right stability is increased because of lower center of gravity! When vehicles ar “jacked way up” (so that people need a ladder to get in), – the center of gravity is dramatically raised, which makes it more easy to tip over——–ever watch those “monster trucks” running over other vehicles on tv, — they bounce around like a basketball, and easily turn over!

Now about the tires (and tire size)– smaller wheels and tires will bring the car closer to the ground also, but this is also another “can of worms”. Unless the ring and pionion gears in differential, are changed to compensate for change in tire circumferences, – the engine is going to be running a whole lot faster to make the car go a set speed (for instance if 13″ wheels put on car that uses 15″ stock wheels), —-the speedometer is registering 60mph, but the car might only be going 40! This may give you breath taking accelerration, but your mileage is going to be way off (down) on gas! Now if you have a new enough car with electronic speedometer coming from computer, — it might be possible to re-program computer/speedomerter so that it reads right — but this won’t change speed of engine, — so now it is registering 60mph, – the car is going 60mph, – but the engine is running closer to 90mph– this obviously is going to give you the same mpg as driving in next lowest gear from drive (or o.d. if so eqipped) all the time!

Lowering the profile of vehicle does not nescessarily decrease drag, — drag is more closely related to shape of car body! As a matter of fact an apron underneath front end to eliminate air from eddying around suspension parts, and backflowing underneath lower part of firewall may decrease drag more than lowering car! This is the main reason for “air-dam” on racing cars! Changing airflow under car will make more difference than getting closer to ground, — in fact in some cases, it actually increases drag depending on how front end is shaped, – as too much air going underneath can be pressurized, and actually be making more drag underneath,– while at same time raising car up, which throws stability off!

I worked for airplane manufacturer for some time, and we did all sorts of “drag tests” (and airflow angles) using tufts of yarn, and recording videos of what they did at different angles speeds and propxiomity to the ground (as on landing gear)! It is very interesting what changing airflow of items close to ground willl actually do!