Mefi tuners - Lateral-g Forums

transam · #1 10-28-2012, 11:05 AM

Does anyone know of any good mefi tuners in washington state or even vancouver bc canada? I am stuck with a mefi equipped turn key engine with no way of tuning it. I really dont want to take the car to california if i can avoid it. Also how safe is a mefi system? Without a mass air or o2 sensors how does the ecm know if the motor is about to melt down? I know it has a knock sensor but simce it has a kenne bell supercharger im sure its sensitivity is programmed on the lower end as ive heard the harmonics of the blower can set a knock sensor off. Any help would be appreciated

**camcojb** · #2 10-28-2012, 12:55 PM

If you're talking MEFI 4 I sympathize with you. I did some tuning on a car with that system, and it's very clunky to tune in my opinion.

transam · #3 10-28-2012, 03:33 PM

I am contemplating going fast or have a custom harness made and go oem gm ecm. Im not sure which way is the better way to go at this point ,i dont know a lot about this system other then it is gm marine delphi system. Judging from the headache i have im assuming its not a desirable set up

**camcojb** · #4 10-28-2012, 04:55 PM

Quote:

Originally Posted by transam

I am contemplating going fast or have a custom harness made and go oem gm ecm. Im not sure which way is the better way to go at this point ,i dont know a lot about this system other then it is gm marine delphi system. Judging from the headache i have im assuming its not a desirable set up

I would say it is not a desirable system. The standard GM ecm's work great with either EFI Live or HP Tuners software to do the tuning.

**Sieg** · #5 10-28-2012, 05:43 PM

Jody is the MEFI system "handcuffed" due to marine designation and environmental issues?

James OLC · #6 10-28-2012, 06:50 PM

The MEFI system is handcuffed not because of its marine roots... It's just old and simple and not too many tuners are any good at tuning it (or want to learn). You can get it to work and you can run it with O2 sensors but it takes patience and a good tuner. Hunt around and try to find a tuner who can maybe come to you (ie. Mike Norris)...