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Ba Mk2 Xr6T Dosn't Feel Any Faster Than Std Xr6


PLASMO

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  • Member For: 13y 4m 5d
  • Gender: Male
  • Location: Hobart, Tasmania

Just recently got my first xr6t and it dosn't feel much different to the auto rental xr6's I have driven. Should it wheel spin in second when I dump the throttle at about 3k in the wet? Do the standard xr6t feel much quicker than non turbo's? I have done the solenoid clean and checked the pipework for leaks and fixed a torn rubber going to the throttle body and it's not much better

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  • Member For: 17y 8m 16d
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What model? Auto or manual?

Yeah it should feel faster then a similar non turbo.

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  • Member For: 15y 6m 27d
  • Gender: Male
  • Location: Perth WA

maby it just needs a good service? but yes it should feel a fair bit faster if you are concerned maby do a 0-100 sprint and get someone to time it 6 seconds dead is the average with a good gear change

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  • Member For: 20y 27d

First check your car. If all is well here is an explanation as to why it may feel slow.

The fact is the XR6T Turbo variants in factory tune 'feel' slow. This is a very good thing from a performance, durability and from a comfort perspective. The reasons are:

  • 'Feel' when it comes to acceleration, colloquially the 'shove in the back', is dependant on the first and higher derivatives of acceleration with respect to time.

  • Once on boost the exceptionally smooth power delivery of XR6T Turbo variants results in a derivative of acceleration with respect to time, technically called ' jerk', of zero.

  • The human body is much more sensitive to changes in acceleration than it is to the absolute value of acceleration. Hence, on boost with a value of jerk = 0, the XR6T variants feel exceedingly slow for any given average rate of acceleration.

  • With jerk =0, the tyre contact patch also experiences the same smooth delivery of force. Hence, XR6T Turbo variants can maintain traction exceedingly well, even in the wet.

  • A NA engine, which has no turbo threshold or turbo lag, builds torque in an exceedingly short time. The NA engine therefore has a jerk values far higher than the XR6T variant. This is despite the NA engine's far lower peak and average acceleration. However people, being human tend to interpret the NA engines' high jerk values as high acceleration, but this is not the case.

In short, your perceptions are a crap way to judge acceleration over time. They will always put a premium on the value of lumpy, dramatic but useless power delivery. Breaking traction is similarly a poor way to judge acceleration as it places a premium on power delivery that is a dramatic way to go nowhere fast.

What is needed is access to a three axis accelerometer coupled to a high speed sampling processor. In the past this was only available in instruments such as the G-Tech. Today every decent mobile phone has such an accelerometer array, in addition to a GPS receiver which can provide similar data.

Regards,

aa

Edited by aiboart
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  • Member For: 22y 1m 20d
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Check if the actuator rod is still hooked up to the wastegate flapper, when I bought my F6 I had the same problem (could see it wasn't making much boost because of the factory boost gauge) got home and checked over it and found that to be the problem, was awesome after that.

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  • Member For: 13y 4m 5d
  • Gender: Male
  • Location: Hobart, Tasmania

thanks for reply's guys I have installed a dyno app on my phone and will go for a run today and see what I get :)

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  • Member For: 13y 4m 5d
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  • Location: Hobart, Tasmania

Ok so best I could get was 14.5sec 0-100kph with the car weight and drivetrain loss it's about 100kw... No wonder it feels so slow! So I will now check the acctuator rod I guess.

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14.5 second 0-100 ?????? WTF that's 2.8L non turbo diesel hilux territory

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