MEFI4b Computer

Discuss General Motors (GMC, Chevy, Pontiac, Hummer, Cadillac, etc) tuning topics here. Request definitions, discuss parameters, etc.

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Joined: Thu Oct 26, 2017 7:19 pm

MEFI4b Computer

Post by rwilson2510 »

I bought Mefiburn scan and tune software. I got it all working and communicating. I found Chevy performance locked the tune in the mefi 4b controller i have. It looks like i will need mefi-4b10.xdf where can i get this file. I tried going to the obddiagnostics website and cant find this file. also it looks like i will need LT1perfect65105-4b. I installed this computer on a Chevy 350 with a ramjet 350 manifold. The Cam the engine is basically a 327 corvette. The heads are vortec heads with 175cc intake runners. I got everything running but i want to get the computer dialed in and running 100%.

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Joined: Fri Apr 18, 2008 5:19 am

Post by cbernhardt »

Contact Bob at OBD Diagnostics. If you purchased their software they may furnish the files you need. If your MEFI4b computer is from a GM RamJet 350, Bob may be able to furnish you with the password.


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