Originally Posted by Chris Peralta

Sorry but ALL engines are different, you can't tell me that every engine runs the same deck height, the same compression, and the same heat of glow plug. All of those actually make a difference on engines at altitude. You can be the best tuner in the world and if your way over shimmed at altitude your gona run hot, have no power, and chase a tune all day. There were a good number of pro drivers this year that really struggled with their engines at Nationals here and the altitude at that track is 6,500 feet. It's not like any of those pros are bad tuners, so it's not as easy as just tuning it to make good power.

I was asking because I was hoping someone in here has actually been running a GO engine at altitude, and has tested different things. I mean it could be as simple as running 40-50% nitro or it could be pulling a head shim, running a cooler plug and going to 20%.