Originally Posted by dhoom9
This is great eye opener when selecting the best power car. But can you explain this in detail?
See sirji, I won't go deep into it but a simple line says it all: "There is no replacement of displacement"
Turbocharger is nothing but a gas turbine affixed with a compressor(centrifugal one) whose work is to feed compressed/denser air into the cylinders. Now until the turbine is running at enough speed for the compressor to start feeding the good compressed air to the cylinders till that time we face the lack of power/torque - turbo lag to be precise.
Now maybe after the turbo is running at its best the small displacement engine may produce bagfuls of torque but during the lag period, smaller the engine weaker the power delivery is.
It is the N/A(Natural aspiration) zone(say under 1500-2000 rpm on most turbo diesel cars) where the forced induction isn't strong enough to make some serious torque and this is where the high displacement engines shine. They do produce more power than their small displacement counterparts during this lag zone and hence the cars with higher displacement engines do make the big kill at the end.
Its not for no reason I always say "take that Ertiga, Ciaz etc on hills and then see how driveable it is left". Here is one thread that may help: Is There Any 'True' Replacement Of Displacement?
Originally Posted by AMG
The rear, in RWD to grip the surface, has to have some weight.
Imagine having a RWD car, with a lot of its weight upfront. That means the rear axle is very light, therefore it becomes easy for it to lose traction.
And the reason behind this limit is the fact that the front wheels have to do steering as well as supply the power.
Upto 250 BHP they can cope well, but beyond that the power begins to dominate the steering and as such you do end up with a very unpredictably handling car.
Sirji I have just four terms:
1) Longitudinal Load Transfer
2) Lateral Load Transfer
3) Squat and Dive
4) Drive shafts.
There are many front heavy RWD cars but with the electronics like TCS etc, the issue you mentioned is nearly gone. I agree it does exist BTW
There are vehicles like pickup trucks which are very much front heavy and equally rear light(BTW
Mercedes Benz SLS AMG is somethign you will like) but if you apply the above mentioned 4 terms then the story changes. No wheels lose traction, in fact during hard acceleration, the wheel of a FWD car loose traction as well as give torque steer too.
A front wheel drive can take even 2500 bhp of power and turning is not that big issue(the wheels do pull the car after all in the direction they are turned into) but issue arises with the above mentioned 4 terms. So much power when going to front wheels becomes a bit tough to control and that is where the issue lies.