fixx
 

i make my own!!!...DIY.....

Are you taking about the cmd units?

I thought about it, but two possible problems with the system for my application

1. Requires a permanent O2 sensor, because it constantly monitors. O2s do not like water, and are not exactly cheap to replace.

2. If the system fails it will revert back to what ever you have, stock tune, which may not be safe for my new mods

FYI. The mefi burn software for mefi 1-4 is only $595, and the software also serves as a data logging scan tool that allows you to see many sensors and parameters at once. The rinda scan tool alone is 395, and really isn't any good for an over all picture.

I'm still goin for it!

You don't need to leave the sensor in. It's a much more user friendly tuning platform then Mefi burn. I don't know if they have a system that will work with the TBI though. Might be worth a call to Keith @Dynojet. If they have a system that will work it would save you a lot of time. Tuning a Mefi 3 with mefi burn is very tedious.

Running an O2 sensor all the time is not a problem if mounted correctly. I'm going on three seasons plus a tuning session and its not an issue.

I tossed around the idea of using the CMD system but it only tackles fuel issues. With MEFIBurn I can tweak all the parameters, timing, coolant temp vs bpw etc.

The most difficult part to tune with MEFI are the transients (heavy accel/heavy decel).

4bus, not sure how I missed this thread. I kinda thought you would have to go a different route after a cam change. What route did you go to select your new cams? My motor is being pulled down for rings and inspection...I am afraid I will end up with a different cam like you.

I was going to go with a "Canned tune" but I didn't go with a "canned cam" :D

Knowing so much about automotive diagnostics, but have little experience in custom ECU tuning has been eating away at me for years....now is the time. I can always try a canned tune afterwards. The guy you sent me to was great and very supportive, and honest! But, he wanted me to have an afr meter, I needed a scan tool, and he said I will prob have a trouble around the docks with my cam choice but keep sending it back with new readings until we get it right.....um, or just tune myself?

These are my came specs

612/637 lift, 242/248 duration on 114 CL +2 advance

I can't imagine trying to solve a hard acceleration issue, or dock stall issue by sending an ecu back and forth through the mail.

the mega squirt is the cheapest deal I think...but you need to come up with your own wiring harness...not a huge deal...building mine right now...will post some pics as soon as I get it back together...you only need the MSII box which will run the EFI and the ignition/timing curve..less than $500

I've spoke with him, they could work my connector but he told me wide band o2 using auto tune is the only way to go, which means live 02 sensors all the time

Cheapest? Not really worried about cheapest, however I think the MEFIburn price is hard to beat, and I won't be making harnesses...and it will still scan with a merc tool when I am done, which is valuable come resale time....I think. Not to mention I am tweaking my stock file. Als keep in mind that I have twins, which doubles the cost for your application...mine stays the same

You guys really hate the merc computers huh? We have a few locals that have failed at tuning that also seem to hate the merc computers. I will either be joining you all for a drink about why computers suck, or I will be the new resident expert

Here is the cost break down for you

Innovate wideband AFR $155.00
SS bungs and plugs $40
Welding to tails $100
MEFIburn, tunerpro, scanner pro $595.00