QWK, you just jogged my memory. For our racing series we have to be able to idle down below 4,000. For the first heat I would use the Enya 3 as that is the only time the idle was verified. Then I would switch to the OS 8 to gain a little more top end. If it got hotter then 90 that day I would switch to an MC59. Obviously in regards to this post it was overkill.