I'm gaining skills in tuning newer cars through some training, and I want to apply it towards my daily - my 1991 F150, 5.0L E4OD, RWD. I've tried a lot of independent research to find the best way to dig into the PCM and do some minor tuning, and I've only found two good options - the TwEECer or a JET module.

I like the idea of the TwEECer but I can't find any information about its compatibility with 1991 models. I emailed the support on the site but no reply ... Have any of you guys tried one of these programmers on a like vehicle, and if so, how effective can it be if used correctly?

 

All ford OBD1 PCMs are physically compatible with modules, the J1 port is where these devices are installed and all PCMs have one. The issue of compatibility begins when you get into the software end of it, somebody has to map the memory locations inside the PCM for all the different functions and generally this has not been done for pedestrian car and truck models... only for the performance models. The good news is the Lightning was one of these performance models so you could use that PCM and gain access to all engine management processes while not compromising transmission functionality or have to make any other wiring or hard parts changes.

 

You don't want to buy a tweecer, it works but it's crap, I have used one. The only advantage to it is you can change tunes with the flip of a switch. I would not suggest that

You also shouldn't buy a pre-made tune for a gas motor, it is really best to have any tuning done for a gas motor using s dyno.

I have gone through the change you asked about.

Conanski is right in that you can get an ECU with E4OD to tune but sometimes you end up paying a lot for the software. So if you go that route or use a trans controller like me will really just depend on your needs. I think it is good to have a trans controller, I can monitor activity on that like logging with the ECU

 

What makes you say that, I have worked with both the Tweecer and the Quarterhorse an there wasn't much difference IMO.

 

I was being a bit general, but, I've had problems with hardware, software, and the support.

My hardware issue was where the chip came off the PCB (was soldered on).

I am not a fan of his software, you are at his mercy if something isn't right with the strategy, he is just one person, not a community.

I've not had one problem with the quarterhorse.