Quote:
Originally Posted by parmas
YOUR COMPRESSION IS LOW, SO YOU HAVE A CLEAR RANGE TO PLAY WITH ON BOOST. DO A WIDE OPEN THROTTLE RUN AND SWITCH OVER EXACTLY AFTER. CHECK PLUGS AND IF IT IS BLACK YOU ARE EITHER RUNNING RICH OR IGNITION TIMING IS FAR TOO RETARDED. IF YOUR FUEL RATIO WHILE ON BOOST IS 0.85, THAN TIMING IS THE PROBLEM. IF YOU DECIDE TO INCREASE TIMING, FIRST ENRICH THE MIXTURE TO 0.75 THEN INCREASE TIMING ONLY THE LOADS WHERE WI IS TURNED ON. YOU MUST REALIZE THAT WHEN INCREASING TIMING ENGINE SHOULD RUN LEANER ALTHOUGH YOU INCREASED FUEL
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No, no and no. Do not follow parmas "tuning" method. This is clear evidence he needs to get the straight fact. This is old school "tuning".
mrx79, you are not really losing HP with WI and 21-22?BTDC@16psi should be plenty enough timing. With you current power level, you may not need WI if the fuel octane number is good where you live but the set up is getting close to use it.
If you need more power then raise boost to about 20psi, run that 350ccm nozzle and start with low ignition like 12?BTDC and raise it on the dyno run after run until you get to a plateau (while making sure the engine does not detonate) then back up 1-2? to have a super safe tune. Also, make sure you set up and test the WI failsafe properly. This is the most important thing to do unless you do not mind rebuilding.