Hacking/tuning the jeep ecm

**EagleMark** · 11-30-2011

I'm telling you the piggy back tuners are what guys use in cases like this. I have personally used several from Perfect Power. They will do everything we do here with GM stuff. They also work with all the GM ECMs instead of doing the chips. They also have capabilities for tuning nitrous, turbo and superchargers. Once you find out how much they cost and the ease of installation and use compared to re-inventing the wheel you will believe me.

But if anyone would know if your Jeep ECM could be done would be Westers Garage.
http://westersgarage.eidnet.org/index2.html

As far as someone to hire to disassemble a chip, write an XDF and ADX look for Traxion or Cal Editor on:
http://www.monodax.com/forums/forums.php

**1project2many** · 11-30-2011

Imagine you want to get more power from an engine but you have no idea how it works. You don't have books, you don't have the 'net, and you don't have someone else to ask. You don't know what a cam is, you've never heard of compression ratio, and the word piston has never been spoken near you. You have some tools but they may or may not fit the engine and they may or may not work together to disassemble the engine. You know someone somewhere has modified their engine so you have faith it can be done, but you have no idea what it took them to do it. All you know is if someone did their engine, then they or you should be able to modify yours. Doesn't seem like an easy job, does it?

Making a definition file and coming up with a disassembly is a huge undertaking. Around 2001 Lyndon Wester actually hired a guy to work full time on disassembling GM code for him because it takes so much effort and time to get it done. And that's with a known processor and known examples of code from similar computers. Working with an unknown ecm can take even longer. If it were simply a matter fo finding someone and handing over cash, everything would have been hacked a long time ago. What stops these efforts is the sheer time it takes to work out the details.

You can probably read the eprom in your ecm. But what you'll get won't look like anything you recognize. Will it be code? Or calibration data? Or both? You'll need to pass it throught a disassembler to know that. And in order to know what disassembler to use you'll want to know the type of processor used in the ecm. And then the disassembler may choke multiple times forcing you to make manual modifications and restart the process.

If the ecm is a chrysler design similar to some of the cars and trucks there are a few places to go. Like the GM stuff, you'd better be prepared to do some research first.
http://www.omniglht.com/cal.html
http://www.omniglht.com/sbec.html
http://www.turbo-mopar.com/forums/fo...?36-EFI-Tuning
http://www.turbo-mopar.com/forums/kn...BEC-Tuning-FAQ

I wish you guys would stop thinking everything needs to be SFI. The 86-87 GN is sfi and it uses an older "C3" ecm. But the Syclone is batch fire and can do everything the GN does.

**JeepsAndGuns** · 11-30-2011

Looks like I have plenty of reading to do from all those links. Might take me a little while to get through them. But it looks more promising than all the rest of the info I have been able to find.

**cmaje72** · 11-30-2011

There appears to be more info out there but still no less spendy solutions since I last searched. Do some searched using JTEC.
More reading:
http://thespeedfreaks.net/showthread...l-Or-PCM-Flash
http://www.jeepsunlimited.com/forums...d.php?t=474337
http://dodgeram.org/tech/repair/Pcm_diags/Page1.htm

**JeepsAndGuns** · 12-01-2011

Well it looks like the ecm in my jeep is whats being called a "SBEC" ecm. Its used in lots of the same year range dodge and chrysler vehicles. Seems like the dodge ones have been hacked some and people can and do read the chips, make changes, and burn new chips. But the software appears to be nothing like tunerpro. I havent even found any good info about what tuning software they are using. But I'm still searching and reading.

But just to keep the conversation going, incase tuning the jep ecm doesnt work out, and since the 12200411 gm pcm is so expensive to tune. And since I know nothing about chevy engines and all the diffrent chevy engines. Are there any chevy obd1, tunerpro supported, sequencial multiport, V6 ecm/pcm's that might could be a possiable swap. I'm still gonna exhaust most options I can find to tune the jeep ecm, but like I said, jut to keep the conversation going and explore other options, what is there out there? Not sure if I want to learn another tuning sofware, it took me so long to learn what little I know about tunerpro, and I really like it. So if I it doesnt look like I will be able to fine anyone to make a tunerpro defination, then I may start exploring those other options.

**1project2many** · 12-01-2011

There are no Chevy engines which meet your criteria.

**dave w** · 12-01-2011

I'm often asked to tune Jeeps, but I always have to decline. For what it's worth, would the Moates.net Road Runner be an option for the DIY Jeep computer?

dave w