mefi questions please help
#1
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Join Date: Feb 2009
Location: Canada
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mefi questions please help
hey guys i own a 1997 baja 272 with a 454 mpi. i am looking at buying a whipple for it and the guy has a mefi 4a ecm. what is the difference between a mefi 4a and 4b. i have looked all over and can not find any comparisions.
also will the 4a work fine for my application? oh ya my engine is completly stock.
thanks
also will the 4a work fine for my application? oh ya my engine is completly stock.
thanks
#2
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E-mail Todd peterson here:
http://www.racepak.com/Road_Racing/index.php
He has worked for the GM factory teams and knows everything there is to know about the MEFI computers.
Jeff
http://www.racepak.com/Road_Racing/index.php
He has worked for the GM factory teams and knows everything there is to know about the MEFI computers.
Jeff
Last edited by hallj; 02-16-2009 at 11:55 AM.
#7
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the mefi 1 is not horrible, however, conquest30' is correct, it is not able to do any above 1 bar tuning. You CAN re-pin your harness to handle the mefi4.... for your application the 4b vs 4a offers no advantage. There are a few more controls available in the 4b, but none that matter at your(I assume) hp and injector size level.
What do you want to know?
What do you want to know?
#8
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My 97 was a mefi 1. I bought the harness ends from AZSM and converted mine to mefi 4b. Make sure you're tuner has the capability to tune a 4. I don't think M3 software works(?)
#10
Michigan Mad Man
Racer
Mefi 4, 4a, and 4b are all pinned the same. You need to use the correct software level for each one. The 4b breaks the fuel and spark tables down to be more precise. I have new mefi 4 harnesses it is a lot of work to convert a mefi 1 harness over. Tyler