Originally Posted by
Chris Peralta
I have a question for you guys.... Does anyone in here run these GO engines at an altitude of 5,000 feet or above? I am curious what your doing to get power out of them as I have seen several GO's run up here and one was in the hands of a team driver from Texas, and I have not seen the power you all are speaking of with these mills.
Are people pulling out headshims on engines at sea level at all?
the general formula for power loss with increases in altitude is 3% every 1000 ft above sea level if you race in colorado at 5000 ft instead of california at sea level you can expect to loose 15% power output out of your engine if the engine is tuned proper, running at higher altitude requires a leaner mixture setting than running at sea level, tune accordingly for good performance.