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Horsepower numbers are nice ways to compare modifications, but not necessarily essential for the driver's use. Much depends on your goal. If you want to radically modify the motor (e.g., you're planning to race the car), you'll need repeated access to a dyno plus lots of discretionary money. But many of us are more interested in moderate modifications that noticably increase the available power and responsiveness without seriously compromising road-worthiness and reliability. If this latter target is your goal, tweaking is a fine second step - - after a thorough tune-up/timing job/general condition check (check/replace those vacuum hoses!!).
Before you start soldering on the circuit boards, I strongly suggest you start with Kevin K's posted guidelines. He's established a reputation on this board as thoroughly familiar with handling and modifications for the 900. This approach does not substitute any components but simply allows some adjustment of the performance parameters.
Dave New's site has pictures and general info:
http://www.geocities.com/Baja/Cliffs/2661/apc/apcboxadjust2.html
It also contains this link to Kevin K's theory of APC tuning:
http://www.geocities.com/Baja/Cliffs/2661/apc/kevinapc.html
This is one tweak that will work. Oh Lordy, does it work! But BE WARNED: Speed can become addictive. This mod will give you a taste of the possibilities. Odds are, this won't be the last performance modification you make, only the cheapest.
Good luck. Have fun. And worry less about the numbers than the results. You'll like the results.
Jim Watts
87 SPG: The Stealthbomber
Kevin-K tweaked Red box APC, K&N, sport exhaust, SPG9 AID, 3.0 bar fpr and braided steel brake lines: estimating 190 - 200 hp and drooling over the next steps....
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