Mefi tuners - Lateral-g Forums

transam · #1 10-28-2012, 01:05 PM

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, 02:55 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, 05:33 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, 06:55 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, 07:43 PM

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

**James OLC** · #6 10-28-2012, 08:50 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)...

**camcojb** · #7 10-28-2012, 09:29 PM

Quote:

Originally Posted by Sieg

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

Quote:

Originally Posted by James OLC

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)...

yeah, it just doesn't have the software or tuning resolution of the modern systems or normal GM ecu's. I got some help from a GM engineer to get it to at least a point where I could tune from, and the car ran pretty good by the time I was done. I just would not recommend it based on my experience with it.

It's like most systems, if tuned properly it's capable, but this one just is a lot tougher than it needs to be to get right.

Sparks67 · #8 10-28-2012, 09:47 PM

You might be able to contact Rich Gala of UCS Tuning. http://www.ucstuning.com/ Former W2W. He can give you advice on who to contact, but on supercharged engine you want a good tuner. My Harrop TVS 2300 LS3 418 uses LS1 ECU and Speartech Harness, but it was tuned with HP tuners software.

The problem that I ran into was finding a person that can use HP tuning software, that had experience tuning a Supercharged engine, so Kurt Urban hooked me up with Rich Gala. Also, you need to find a tuner that is willing to travel to your location.

Jeff

supremeefi · #9 10-29-2012, 07:03 AM

Yes that system is dated, batch fire (all 8 at once), and further tuning is limited. Watch my video where we replaced one with an aftermarket ECM. Went from having to use 93 and getting 10mpg to using regular and getting 15+.

With a blown application especially, I'd opt for an aftermarket system.The safeguards alone would make it worth it.

At the end of the day you'll be glad you went in another direction.

64duece · #10 10-29-2012, 07:18 AM

I'd also agree that going to an aftermarket system is probably money and time well spent edpecially with the limited capability of that ECU. I used to tune them for years, they are a PITA. Don't bother anymore as the reults are just not worth the time invested. Check into Holley HP ECU & Harness Kit. I think you'll find the price and tunability a nice option.