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SU performance tuning... 1800

posted by  someone claiming to be Rhys on  Fri Mar 4 19:01 CST 2005 [RELATED]

Beyond around 3000 RPM the need for increasing ignition advance is reduced by the increased turbulence caused by piston movement. However modern engine management systems do show an ignition map that varies dependant on load and RPM beyond 3000 all the way to redline. It's just that the mechanical systems that do not feedback need to be limited to prevent engine damage.
Remember the Chrysler Lean Burn systems of the early 70's? They achieved up to 60 BTDC at light load cruise. And that with a carburetor. Talk about tip-in ping and surge......
If the engine is not expected to do much below 3000, then don't worry about the advance curve to maximum. Just set the maximum and see what happens beyond that RPM. Remember to be kind to your pistons though...





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