2wd or 4wd for dyno tuning?

TadasTadas Wagonist
in General Civic Wagon Discussion
I have heard mixed opinions on turning off the 4wd system to save viscous couplier for dyno tuning. What have you guys done? Also would keeping it in 2wd mode still incur more drivetrain losses than regular 2wd car? I mean is the driveshaft not spinning while in 2wd?

Any info is appreciated.

Comments

  • PoozMcgueePoozMcguee New Wagonist
    I've been running 4WD Last few months, Just had to change to 2wd over the last week and notice the engine is much happier to rev, Takes off from the lights quicker. I'd run FWD as the less drive train drag makes sense. Calculate the transmission loss from a common honda fwd figure... unsure how much % loss is in the 4wd box.
  • TadasTadas Wagonist
    See that is exactly what I am trying to figure out! Anyone done dyno tests 4wd vs 2wd?
  • PopPopsGaragePopPopsGarage Council Member
    http://www.superstreetonline.com/how-to/engine/modp-1005-drivetrain-power-loss/
  • beauregaardhooliganbeauregaardhooligan New Wagonist
    I ran mine for awhile without the propeller shaft until I got the new uJoints and it definitely had more jump, but the torque steer was strong.
    Keep in mind that unless the prop shaft is removed it will turn with the rear wheels.
  • LowFlyin'LowFlyin' Moderator
    Tadas wrote: »
    I have heard mixed opinions on turning off the 4wd system to save viscous couplier for dyno tuning. What have you guys done? Also would keeping it in 2wd mode still incur more drivetrain losses than regular 2wd car? I mean is the driveshaft not spinning while in 2wd?

    Any info is appreciated.

    I'm unsure of what you are trying to ask. Are you wanting to dyno tune on a 2WD dyno with 4WD still engaged or are you wanting to know if it would be better tune the car in 2WD or 4WD?

    Since you are wanting to tune the car, all you need to do is put the engine under a simulated load. The Dyno can do it in either 2WD or 4WD.
  • TadasTadas Wagonist
    It's all good Lowflyin' I got it tuned in 2wd mode and then switched it to 4wd mode for street driving. It had less stress that way on the viscous coupler.
  • LowFlyin'LowFlyin' Moderator
    Tadas wrote: »
    It's all good Lowflyin' I got it tuned in 2wd mode and then switched it to 4wd mode for street driving. It had less stress that way on the viscous coupler.

    Most 4WD dynos have the two drums connected, so the only way you'd put stress on the VC is if they front had traction issues. Otherwise, it wouldn't have made a difference other than showing a lower power number.
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