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Originally Posted by 67ragtp
I will call FAST, I have to admit if I didnt have Dave Page from FAST talking me through the initial start up It would have been frustrating. The engine didnt idle upon turning the key, it was like 9.0:1(blinding pig rich) and the timing table had like 30 deg in it at idle, after he showed me how to make corrections to the base fuel map and spark map it really smoothed out. In 20 min. on the phone with him it was quite a learning experiance, cant thank him enough. One of the biggest problems I have is trying to understand how kilopascals in the base map correlates to load and engine vacuum in inches of mercury. I guess Im still thinking standard inches from carb tuning.
Thanks Rich
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Yeah, you'll get used to it for sure. KP is opposite of vacuum, so for the smoothest idle with highest vacuum you're looking for the lowest KPA. When tuning the idle initially I like to get a whole block of numbers highlighted on the fuel map, say 6 or 9 that surround the cursor on the screen; however many it takes that the cursor isn't moving out of this area at idle, and then go up/down depending on the a/f and how the engine sounds.
One other tip I use when tuning is to give the engine what it wants. Some combos aren't "happy" at 14.7:1 or similar A/F at idle for example, and you can hear it by how they run. Don't be afraid to try a slightly richer A/F there and see if the engine smooths out and sounds better. Don't get hung up on a certain number.
Jody