My jeep had one in it when I bought it, but I recently put the original back in to troubleshoot a problem I was having. I didn't notice any difference really, except now I use 87 octane. I've thought about selling the Mopar one.
need to clarify, the mopar performance computers and reflashed computers do improve performance over the long term, the stock computer eventually learns to "overcome" piggyback chips so that it's running stock parameters after a couple months/thousand miles or so.
'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.
Hence the reason I have the stock and the performance computers.
00 4.7 Laredo...KYB gas shocks, ADDCO rear sway bar and Firestone Destination tires.
08 Z71 Suburban
94 5.9 Laredo 6.5 RE lift with 35 Maxxis Bighorns
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Ok thanks, I was just wondering for when I get my ZJ, what some common mods are for performance. I work on vehicles all the time and I understand what does and does not work on engines, so Im not a total beginer asking about stuff I dont know about. Just let me know or lead me to a forum about performance. thanks
1996 Dodge Intrepid, 3.3 V6
1993 Jeep Grand Cherokee Laredo 5.2-SOLD :(
1999 Chrysler 300M
they help for a little while, but then the computer in the jeep re-learns and adjusts it back to stock setup.
I had heard this in a passing conversation with a couple of MOPAR wrenches at a bar. Thanks for the confirmation. Hardly worth it if the brain box has to be replaced, too. I thought about this awhile ago and came to the same conclusion. In my mind, the only reason to do this is in conjunction with a serious hi-perf rebuild. No thanks. I know I am going to have to go into my driveline sometime soon but the $$$ involved with that AND a rebuild? Nah.
98 ZJ 5.2 Auto with "one [COLOR="DarkOrange"][SIZE="5"]million[/SIZE][/COLOR]" miles on it. Camoclad exterior means you never have to wax it! The journey continues......Jeep On, baby!
Last edited by 98ZJ_USMC; 04-28-2008 at 08:53 AM..
there are two kinds of chipping: performance box and an actual chip in your ECU.
Box is the worst way, it's just "lying" to your ECU about different conditions that provoke engine to work hard/give more performance.
Box is a crappy way to go if your vehicle is still under warranty and you need a plug'n'play solution without messing with your ECU hardware/software
Now the actual chipping in the ECU (custom job) or remapping your existing ECU is the way to go.
As far as your 5.2 goes, you won't get much out the ECU tweaking unless you go turbo, that's when real gains will show.
Are we talking OBD2 ECU's here or does this same 'worthlessness' relearning process occur in the OBD1 on boards as well. i didnt know the mopar ecu upgrade was just a 'piggyback" thats a shame the computer learns to ignore the performance chip upgrade... :/ seems like a waste of 300 bucks
The Mopar performance ecu is a replacement ecu that has been aggressively tuned and requires premium fuel. It makes a big difference. I had one on my 95 ZJ. I bought it from firstname.lastname@example.org and sent in my original ecu as a core and got 100 bucks back. Email him and ask if they still make them. I have a feeling they are out of production. At the very least Kolak can have your ecu reflashed for performance if you send it out I think.