How high can a 502mpi rev limiter be adjusted?
#1
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How high can a 502mpi rev limiter be adjusted?
I have a friend that runs a procharged 502mpi and weve been talking about raising the rev limiter. I am thinking 5800-6000. The thought is to rev it higher with a smaller pitch prop and reduce stress on the drive and inprove holeshot as well as acceleration.
#4
Michigan Mad Man
Racer
I can set your Rev Limit up to 6000 Rpm on the Mefi 3. The newer Mefi 4's can go to 9000 RPM. Tyler 8103242720.
#5
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Thread Starter
Thanks Tyler,
I do have another question though. If I set the fuel pressure up to give the proper o2 reading on top end then the idle mixture will be rich? Ive heard of a resistor that "fools" the temp sensor to think the motor is warmer than say 120 degrees therefore keeps the motor out of cold start mixture. ( all of this because of the no thermostat procharger setup) can this be fixed with your programming?
Greg
I do have another question though. If I set the fuel pressure up to give the proper o2 reading on top end then the idle mixture will be rich? Ive heard of a resistor that "fools" the temp sensor to think the motor is warmer than say 120 degrees therefore keeps the motor out of cold start mixture. ( all of this because of the no thermostat procharger setup) can this be fixed with your programming?
Greg
#6
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Yes you can change the value in the ECU. Or change the pulse width on the injectors at the idle RPM and MAP.
Tyler is the man when it comes to setting them up properly!!
Mark at Precision is good too, but Tyler can do it in your boat and he's in MI
Tyler is the man when it comes to setting them up properly!!
Mark at Precision is good too, but Tyler can do it in your boat and he's in MI
#9
Michigan Mad Man
Racer
Thanks Tyler,
I do have another question though. If I set the fuel pressure up to give the proper o2 reading on top end then the idle mixture will be rich? Ive heard of a resistor that "fools" the temp sensor to think the motor is warmer than say 120 degrees therefore keeps the motor out of cold start mixture. ( all of this because of the no thermostat procharger setup) can this be fixed with your programming?
Greg
I do have another question though. If I set the fuel pressure up to give the proper o2 reading on top end then the idle mixture will be rich? Ive heard of a resistor that "fools" the temp sensor to think the motor is warmer than say 120 degrees therefore keeps the motor out of cold start mixture. ( all of this because of the no thermostat procharger setup) can this be fixed with your programming?
Greg
#10
Platinum Member
Platinum Member
Tyler,I wanted to raise my rev limiter when I dyno my motor with you again in a few months,you already have it set to 6000,can we eliminate it completely and just use my msd pills or will I need to convert to a mefi-4 to go to 6400? Smitty