SwedeSpeed - Volvo Performance Forum banner

1 - 20 of 28 Posts

·
Registered
Joined
·
145 Posts
Discussion Starter · #1 ·
Battary reset - now car feels different

I disconnected my battary over the weekend while installing folding mirror switch. <br>Interestingly I notice the car to be quite different this week according to my butt dyno<br>1. It's running faster than before, especially picking up from standing still.<br>2. Suspension in Comfort mode seems to be a lot firmer than before, sport mode is about the same, and advnace mode seem to be a little less firm.<p>I understand that I had erased all ECU data so it has to go through its learning mode again. But does anyone know more specifically why this is? Has anyone seem similar things after resetting ECU? The car didn't feel the same when I picked it up with 20 miles, and does 4C also have a learning period?
 

·
Super Moderator
Joined
·
14,831 Posts
Re: Battary reset - now car feels different (mister2cool)

most people report the same situation when resetting the ECU. it allows the computer to essentially start over with its learning process. your ECU is self-learning so if you drove it like a woman, its going to respond that way on a daily basis. if you beat the crap out of it day in day out, its going to respond aggressively. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

·
Registered
Joined
·
4,478 Posts
i've reset the ECU on my car a lot. car will run a lot better afterward...<p>the car detects stuff that will lower performance...bad gas, heat, - anything that can bring on pinging...it will retard timing...<p>that's probably waht you're feeling. the timing is now advanced back to the stock setting...so it runs awesome. <p>over time, you may notice the performance drop off a bit...the car just reacts to things it senses and drops off the performance to a level where it stops seeing things that it thinks are potential problems...<p>running good high octane gas really helps avoid the ECU retarding timing.<p>
 

·
Super Moderator
Joined
·
14,831 Posts
so if you are more focused on performance rather than fuel economy, re-route the ECU fuse to only supply power with ignition, so it gets reset everytime the car is shut off.
 

·
Registered
Joined
·
21,340 Posts
Re: Battary reset - now car feels different (mister2cool)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mister2cool</b> »</i></TD></TR><TR><TD CLASS="quote">, and does 4C also have a learning period?</TD></TR></TABLE><p>First I have heard of this. Anyone know?
 

·
Super Moderator
Joined
·
14,831 Posts
Re: Battary reset - now car feels different (needsdecaf)

my guess would be no. the software was already written and it is designed to react per the code. i would think only a software download could change the response pattern of the 4C.
 

·
Registered
Joined
·
233 Posts
Re: (phuz)

Phuz,<br>Sounds like a slick idea for heavy foot guy/baloon foot wife combo. Humor me, please. How exactly do make the reroute?<p>Jer
 

·
Super Moderator
Joined
·
14,831 Posts
Re: (senilesurfer)

while i don't recommend doing it, it is possible, but not someting i would be comfortable discussing over a forum <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <p>if you really are seriously interested, i suggest buying a service manual that has wiring schematics, and just relocating the two ECU powers to ignition circuits. that's all i will say <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0">
 

·
Registered
Joined
·
2,351 Posts
Re: (phuz)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>phuz</b> »</i></TD></TR><TR><TD CLASS="quote">while i don't recommend doing it, it is possible, but not someting i would be comfortable discussing over a forum <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <p>if you really are seriously interested, i suggest buying a service manual that has wiring schematics, and just relocating the two ECU powers to ignition circuits. that's all i will say <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"></TD></TR></TABLE><p>Why not install a switch in-line with the fuse? Then one could open and close the circuit at their discretion. <br>
 

·
Registered
Joined
·
145 Posts
Discussion Starter · #10 ·
Re: (TexasV70R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>TexasV70R</b> »</i></TD></TR><TR><TD CLASS="quote">Why not install a switch in-line with the fuse? Then one could open and close the circuit at their discretion. </TD></TR></TABLE><p>what if you kicked the switch while driving? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0">
 

·
Registered
Joined
·
63,543 Posts
Re: (mister2cool)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mister2cool</b> »</i></TD></TR><TR><TD CLASS="quote"><p>what if you kicked the switch while driving? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> </TD></TR></TABLE><br>Probably not the best of ideas
 

·
Registered
Joined
·
21,340 Posts
Re: (mister2cool)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mister2cool</b> »</i></TD></TR><TR><TD CLASS="quote"><p>what if you kicked the switch while driving? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> </TD></TR></TABLE><p>Exactly what I was thinking. Yikes, dead car. <p>Also, as neat as the idea of a relay to reset the ECU every time you start the car, I would be worried about hot wiring anything to do with the ECU. What if the connection goes bad while you're driving. Doh!<p>Total thread hijack, but I was looking at the fuse list (ok, so not a total thread hijack) and noticed this fuse under the hood ('04):<p>#8 A/C compressor, accelerator pedal position sensor, E-box fan 10A<p>What the hell is the E-Box fan? I'm assuming that it's one of those random fan noises that I hear under the hood when I turn the car to ignition position 2 but don't start?
 

·
Super Moderator
Joined
·
9,305 Posts
Re: (needsdecaf)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote">What the hell is the E-Box fan? </TD></TR></TABLE><br>There's a small fan in the "electronics box" under the hood. The kind of thing you find in your PC.<p>Tom.
 

·
Registered
Joined
·
145 Posts
Discussion Starter · #14 ·
Re: (tmtalpey)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>tmtalpey</b> »</i></TD></TR><TR><TD CLASS="quote">There's a small fan in the "electronics box" under the hood. The kind of thing you find in your PC.<p>Tom.</TD></TR></TABLE><p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/sly.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/sly.gif" BORDER="0"> Think I'll get any better performance if I upgraded that fan? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> just kidding.
 

·
Registered
Joined
·
55 Posts
Re: Battary reset - now car feels different (mister2cool)

So you are saying these cars have a form of Artificial Intelligence? They learn to respond and adapt through various external inputs? <p>Can this really be the case - I'd be quite surprised by this in a $70000 CAD vehicle .... but then I had absolutely no idea what this car was capable of when I bought it - apparently neither did my dealer .......
 

·
Super Moderator
Joined
·
14,831 Posts
this concept is nothing new. my 1996 saab 900 had the same kind of learning ability, although a bit more primative <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

·
Super Moderator
Joined
·
9,305 Posts
Re: Battary reset - now car feels different (Joerg)

The ECM doesn't really "learn", it "adapts". This includes using the oxygen sensors to tune the fuel injector pulse rates (mechanical variations), learning the levels to which timing can be advanced without knocking (octane and fuel brand variations), the driving style (response to accelerator input) and interaction with other components such as 4C, ABS/brake and transmission.<p>Personally, I think the "gains" after a reset are illusory, they vanish rather quickly (within minutes). And, I think they're potentially harmful if you try to take advantage of them - the mixture is way off for a little while, if you hammer it that can cause extra detonation, wash cylinder walls, etc.<p>If you want more power, tune the ECU. A reset button will just break something.<p>MHO.<p>Tom.
 

·
Super Moderator
Joined
·
14,831 Posts
Re: Battary reset - now car feels different (tmtalpey)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>tmtalpey</b> »</i></TD></TR><TR><TD CLASS="quote">The ECM doesn't really "learn", it "adapts". </TD></TR></TABLE><p>relatively speaking, its the same thing.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>tmtalpey</b> »</i></TD></TR><TR><TD CLASS="quote"><br>Personally, I think the "gains" after a reset are illusory, they vanish rather quickly (within minutes). </TD></TR></TABLE><p>i agree. i dont think that the gains would be noticeable enough anyway that it would be worth it.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>tmtalpey</b> »</i></TD></TR><TR><TD CLASS="quote"><br>And, I think they're potentially harmful if you try to take advantage of them - the mixture is way off for a little while, if you hammer it that can cause extra detonation, wash cylinder walls, etc.</TD></TR></TABLE><p>yup. run too lean and you will destroy the engine real quick. run too rich and you will foul-out components and ruin the longevity of the engine.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>tmtalpey</b> »</i></TD></TR><TR><TD CLASS="quote"><br>If you want more power, tune the ECU. A reset button will just break something.<br></TD></TR></TABLE><p>there we go! <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

·
Registered
Joined
·
1,877 Posts
Re: Battary reset - now car feels different (phuz)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>phuz</b> »</i></TD></TR><TR><TD CLASS="quote">most people report the same situation when resetting the ECU. it allows the computer to essentially start over with its learning process. your ECU is self-learning so if you drove it like a woman, its going to respond that way on a daily basis. if you beat the crap out of it day in day out, its going to respond aggressively. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"></TD></TR></TABLE><p>can't say I would ever want to beat the crap out of my women, but if she would respond the same way as my R maybe I'd just.......... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0">
 

·
Super Moderator
Joined
·
14,831 Posts
Re: Battary reset - now car feels different (stevectsai)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>stevectsai</b> »</i></TD></TR><TR><TD CLASS="quote">can't say I would ever want to beat the crap out of my women, but if she would respond the same way as my R maybe I'd just.......... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> </TD></TR></TABLE><p><br>....what, reset her? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0">
 
1 - 20 of 28 Posts
Top