Will the ECU automatically adjust
February-4th-2003, 09:13 PM
#1
Super Ninja
Thread Starter
Join Date: Mar 2002
Location: Goldsboro NC
Posts: 413
Will the ECU automatically adjust
ok i was just thinking to myself that when i put my new ported and pollished head on my MP3 with the j-spec camshafts, will the ECU adjust for the extra air intake. will my car run like crap? Rich or lean on fuel. If it is going to be crapy unless i fix something what is it i need to fix or adjust????? thank you 
February-4th-2003, 10:58 PM
#3
Registered User
Join Date: Jan 2002
Location: Dallas, Texas
Posts: 1,122
Yes and no. At part throttle, the car will try to automatically adjust the mixture but will turn on the MIL if it thinks the sensor readings are too out of whack (which is possible in your situation depending on the extent of the head work). However, at full throttle the ECU ignores the sensors and runs the timing and mixture according to preset maps (this is known as "open loop" mode). Therefore, you can't adjust the timing and mixture at full throttle with the stock ECU.
The good news is that the preset full-throttle timing maps are fairly conservative and the fuel maps are kinda rich, meaning that it's unlikely that the engine will self-destruct, and a rich mixture with stock airflow often equates to a more stoich mixture with improved airflow. The bad news is that because the ECU won't self-adjust, the car won't put out as much power as it really should. This is particularly true of the ignition timing; with heavy-duty N/A mods, you typically need more ignition advance, and the stock ECU maps don't really advance the timing enough for a *stock* engine.
To adjust the timing and fuel, you need (a) an entire aftermarket ECU or (b) a piggyback ECU capable of truly overriding the stock ECU; I've heard good things about the Unichip, but the cheap sensor-override systems like a Jet won't do squat.
Good luck!
The good news is that the preset full-throttle timing maps are fairly conservative and the fuel maps are kinda rich, meaning that it's unlikely that the engine will self-destruct, and a rich mixture with stock airflow often equates to a more stoich mixture with improved airflow. The bad news is that because the ECU won't self-adjust, the car won't put out as much power as it really should. This is particularly true of the ignition timing; with heavy-duty N/A mods, you typically need more ignition advance, and the stock ECU maps don't really advance the timing enough for a *stock* engine.
To adjust the timing and fuel, you need (a) an entire aftermarket ECU or (b) a piggyback ECU capable of truly overriding the stock ECU; I've heard good things about the Unichip, but the cheap sensor-override systems like a Jet won't do squat.
Good luck!
February-7th-2003, 05:56 AM
#5
Registered User
Join Date: Jul 2002
Location: Cincinnati, OH
Posts: 1,111
This is about Porsches, but I think it should give a general idea about the UniChip. I just ran a search on Google.com and found this:
http://www.theracersgroup.com/theprogram_unichip.html
Hope this helps.
http://www.theracersgroup.com/theprogram_unichip.html
Hope this helps.
February-7th-2003, 11:28 AM
#6
Use this to install stuff
Join Date: Mar 2002
Location: State College, PA
Posts: 1,069
Originally posted by carguycw
Yes and no. At part throttle, the car will try to automatically adjust the mixture but will turn on the MIL if it thinks the sensor readings are too out of whack (which is possible in your situation depending on the extent of the head work). However, at full throttle the ECU ignores the sensors and runs the timing and mixture according to preset maps (this is known as "open loop" mode). Therefore, you can't adjust the timing and mixture at full throttle with the stock ECU.
The good news is that the preset full-throttle timing maps are fairly conservative and the fuel maps are kinda rich, meaning that it's unlikely that the engine will self-destruct, and a rich mixture with stock airflow often equates to a more stoich mixture with improved airflow. The bad news is that because the ECU won't self-adjust, the car won't put out as much power as it really should. This is particularly true of the ignition timing; with heavy-duty N/A mods, you typically need more ignition advance, and the stock ECU maps don't really advance the timing enough for a *stock* engine.
To adjust the timing and fuel, you need (a) an entire aftermarket ECU or (b) a piggyback ECU capable of truly overriding the stock ECU; I've heard good things about the Unichip, but the cheap sensor-override systems like a Jet won't do squat.
Good luck!
Yes and no. At part throttle, the car will try to automatically adjust the mixture but will turn on the MIL if it thinks the sensor readings are too out of whack (which is possible in your situation depending on the extent of the head work). However, at full throttle the ECU ignores the sensors and runs the timing and mixture according to preset maps (this is known as "open loop" mode). Therefore, you can't adjust the timing and mixture at full throttle with the stock ECU.
The good news is that the preset full-throttle timing maps are fairly conservative and the fuel maps are kinda rich, meaning that it's unlikely that the engine will self-destruct, and a rich mixture with stock airflow often equates to a more stoich mixture with improved airflow. The bad news is that because the ECU won't self-adjust, the car won't put out as much power as it really should. This is particularly true of the ignition timing; with heavy-duty N/A mods, you typically need more ignition advance, and the stock ECU maps don't really advance the timing enough for a *stock* engine.
To adjust the timing and fuel, you need (a) an entire aftermarket ECU or (b) a piggyback ECU capable of truly overriding the stock ECU; I've heard good things about the Unichip, but the cheap sensor-override systems like a Jet won't do squat.
Good luck!
February-7th-2003, 12:03 PM
#8
Protege Enthusiast
Join Date: Apr 2002
Location: PA
Posts: 379
not trying to be a dick, but you guys should really just do a search. theres been tons of info on what the differences between the different systems available for our car. greddy emanage, haltech e6k, tec2, tec3, ecu, and piggyback would probably all turn up a great amount of information on the topic.
February-7th-2003, 11:29 PM
#9
Use this to install stuff
Join Date: Mar 2002
Location: State College, PA
Posts: 1,069
Indeed you get of pages on info on these ECU upgrades, but the only dude that I can remember almost installed it, had to sell it becuase of his wife...So I was just wondering if this system is capable of overriding the stock ECU on a Protege. I know on "most" cars they are capable of it, just wanted to verify it for our cars...
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