2013 Trailblazer 4x4 AT vs 2012 Mazda CX9 4x2 AT -amazingly similar cost of ownership

[d_mac]

I can't say I can argue with your math hehe.

All I know ( from having owned and driven these ) is that a cx9 will win in a drag race vs the Tbz or Santa fe. The forester turbo is in a different league altogether in terms of speed.

My personal preference is turbo direct injected gas > high reving high output NA gas > turbo crdi diesel > normal aspirated normal output gas .

But for practicallity the crdi wins. Its a different story if you're talking about a 535d. But then that's also a whole lot more of money.

That's my personal preference.

Chief, we're not arguing naman po in reality, we're just discussing on things like this, which i personally only think it's also for the betterment of those who really want to know more about the TBz 2.8 Duramax over the others....

As to the discussion on speed and power, we may go back to our high school Physics. And for simplicity's sake, say in general vector form nalang:

Power = force x velocity
Force = mass x acceleration

Therefore:
Power = mass x acceleration x velocity

Granting:
Power = watts
Mass = kilogram
Acceleration = metre/sec²
Velocity = metre/sec

In the case of the TBz 2.8 Duramax:

watts = kg_weight x m²/sec³

To get how many seconds the TBz will cover say a 1/4 mile (400 metres) at different rev-range, say 2000 rpm, 2800 rpm, 3800 rpm

sec = [(kg_weight x m²)/watts]^1/3

Power in watts at an assigned rev-range as exampled above can be derived from brake-hp, where bhp = (lb_force-ft x rpm)/5252

And rpm, kilometre per hour, and the gear you're at can be had from calculating the engine-rev with the gearing ratios and tire specs, which gives an estimate on the following as a summary on the TBz 2.8:



For simplicity's sake, assuming a linear relationship of torque vs. rpm, estimates are:



Doing the same procedure on say the Forester 2.5XT and CX-9 3.8 V6, we can surely make a comparison at 2000 rpm, 2800 rpm, 3800 rpm, 4250 rpm granting that the auto-trannies are to shift up at these rev points. With the manual-tranny no doubt we can short-shift and rev up to the redline at any one-time we want to. There is no doubt of course chief if these gasoline-fed CX-9's and Forester 2.5XT are to rev-out anywhere between 5000 rpm and up, and the TBz only able to rev-out between 3800 to 4250 rpm, arguably, they would eat the TBz at any point in the gears....

You may provide me the gross vehicle weight, peak power, peak torque, gear ratios and tyre specs of the CX-9 to have the same type of estimate and we can then compare, chief.

The gross vehicle weight by the way of the TBz 2.8 Duramax 4x4 is 2750 kilograms.

There might be some wrong values specifically on the conversion from English to metric system, or even perhaps, the whole analogy itself ---- just bear with me chief.

Cheers!