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Prepared All Wheel Drive Build for 2005 STI

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  • #16
    Originally posted by So Close View Post
    Power tuning.

    The previously mentioned MS3 was tuned to launch off of a rev-limiter, in 2nd gear. Not very feasible in AWD, but it brings up the topic of using what the car has. My Escort and FR-s can't do that type of start, especially with their light weight flywheels. You could try extending the rev-limiter in your tune. The STi is intended to operate best at the high end of it's RPMs. But you can't extend the rev range too far without modifications that are not legal for the Prepared class. Would 500-700 extra rpms do it for you Mark?
    I installed the Perin turbo inlet tube and believe the car has better response and turbo comes in a little sooner which helps. I have extend the RPM to 7200 but do not want to go any further as I agree going higher RPM in the Subie without rotating assembly mods will be a time bomb for the motor. I launch in first at about 5,000 which is plenty. If it is slick it will spin the tires but will launch hard on a good surface.

    Mark

    Mark Macoubrie
    RXB
    Kansas City Region
    2005 STI 41 PA

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    • #17
      Your steering inputs can definitely affect how your car handles. If you turn in too aggressively, the back of the car will be upset and start sliding. So that's for corner entry.

      You mentioned corner exit though. Maybe that's your center diff setting causing that? My Subaru doesn't have the power to slide the back on corner exit and my Evo was FWD biased so if the fronts had traction, it was going wherever they were pointed.
      Charles
      MA 1995 Subaru Impreza
      SEDiv RallyCross Steward

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      • #18
        Given the conditions, I wonder if you would have been better off on soft winter tires instead. I bet you'd have had more grip through the powder.
        2016 KCR RallyCross Chair
        Assoc Editor/Photographer Formula1Blog.com
        Photographer/Co-Owner Patterson Prints, LLP

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        • #19
          I agree it was a combination of probably not having the best tires on the car for the condition and getting on the throttle a little too hard too early. I have the stock center and rear diff in the car so I have made no adjustment to the rear or center diff. I actually leave the DCCD in Auto as I figure it probably know better than me how to adjust it. I have played with setting it at different settings and found I am faster if I just leave it in Auto.

          Mark
          Mark Macoubrie
          RXB
          Kansas City Region
          2005 STI 41 PA

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          • #20
            Nice setup!

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            • #21
              Nice setup!

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              • #22
                Thanks. I think it has been working well.
                Mark Macoubrie
                RXB
                Kansas City Region
                2005 STI 41 PA

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                • #23
                  I'm also coming to realize that full throttle is almost never needed. For me, going full throttle effects my mind set and alters my decision process. Most modern cars are going to give full throttle acceleration at roughly 75% throttle application. So, driving with the pedal at only 80% makes it easier to modulate your engine

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