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Acceleration problem i have a jeep liberty 04 3.7l V6 and a honda pilot 3.5L V6. now i admit the honda engine is more powerfull than the jeep but when you calculate the power to weight ratio per ton its like .5 bhp of difference, so in a straight line their shouldn't be a problem but the honda is like a bugatti compared to the jeep. why is that?!

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Ytabaja97. Those transmission can be modified to do what you want or need. Well at least the Jeep. Honda, not so much. Change gear ratios and put in heavy duty clutches, bore out some lines in the valve body, replace the torque converter to a bigger stall. Yes you can get a better torque to engine ratio and the Jeep will take off faster. You also have to modify the PCM. There are programs out there to do this, but they are pricey. if you want power, you loose gas mileage. And jeeps aren't known for good gas mileage to start with. And doing the work yourself will cost around $1000+ for parts. Pus the PCM programming.

Posted on Apr 19, 2015

  • ytabaja97
    ytabaja97 Apr 19, 2015

    Ok one other thing i can't understand is when i bought the jeep when i reved it up it used to make a sound like a roar, but now it sounds like there is a sort of racking sound and when you turn it on it sounds as if its not really happy (dead simpler) and there is a small sound when shifting like a small hit in a component in the rear end possibly.

  • Randy Ohler Apr 19, 2015

    The first could be just an oil change. Valves are lifted by hydraulics. If the oils looses viscosity(worn out) the hydraulics don't work as good. It's like pouring out syrup and water. One is slow( thicker viscosity) and one is fast. the more you heat it up and use it, the viscosity goes away. This has nothing to do with the transmission. The noise in back could be a transmission mount or differential problem. You would have to isolate the noise and repost before I would give you some sort of recourse.

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Ray is right about the apples and oranges being impossible to compare and you are right about the power to weight ratio but the reasons are much more involved than merely transmissions and the ratios they are fitted with.

It is not just the way the engine electronics are mapped or the state of tune of the engines that make the difference in matters of acceleration, though clearly these are major factors; there is also the matter of inertia that must be overcome and the law of diminishing gains to be considered.
Acceleration isn't just about providing enough power to overcome the inertia of the vehicle as a whole but also the inertia of each and every engine, transmission and driveline component which needs a different way of looking at.

Lighten the flywheel by a pound or two and because of the reduction gear through the transmission and driveline it can increase acceleration by the same amount as lightening the body by twenty or more times that couple of pounds.

Make an engine more powerful to haul around a bigger and heavier body and all those rotating and reciprocating components also must be made stronger which usually means bigger and heavier. That means more inertia to be overcome which means even more power is needed which means bigger and heavier components which means more power is needed to maintain performance. This is the law of diminishing gains

Think about it too much and insanity will be the result...

Posted on Apr 19, 2015

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Different transmissions of course apples and oranges

Posted on Apr 19, 2015

  • 3 more comments 
  • ytabaja97
    ytabaja97 Apr 19, 2015

    Well your right but this is a 0-60 and in both SUVs 1st gear 0-40 2nd 40-60

  • ray gallant Apr 19, 2015

    so!! neither are hi preformance vehicles

  • ytabaja97
    ytabaja97 Apr 19, 2015

    Ray i get you there not supercars but a g63 6x6 AMG isn't and yet its 0-60 is less than 6 seconds, okay how can you modify the transmition?

  • ray gallant Apr 19, 2015

    you can't

  • ytabaja97
    ytabaja97 Apr 19, 2015

    What about gesr ratios and that stuff

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