Platinum_Jay Posted September 27, 2011 Share Posted September 27, 2011 Has anyone retuned their cars after changing their exhaust ? I've got a Greddy exhaust and it sounded great however got a little bit drony when it hits 4th gear. I found it had a loads of torque in 1st and 2nd, but tends to lose momentum when in 4th. I pretty much got used to it. Then recently I sent my car to Lexus of Chatswood to replace the disc brakes and they apparently reset my engine / ECU and as a result , no more drone and power is even all through the gears ! I immediately felt the difference and couldn't be happier. Enquired with Lexus and apparently the engine had to re-learn ? (maybe someone can help explain) My engine was too used to just my F-Sport filter and after 100,000km+ it needed a reset to adapt to the new exhaust. (Didn't know there was such thing??) Anyway, thought I'd share this with those who have modified their exhaust or planning to do so. Bring it to Lexus to get it reset ! Quote Link to comment Share on other sites More sharing options...
Atlantis Posted September 27, 2011 Share Posted September 27, 2011 Just disconnect the battery for 15 minutes and don't worry about the dealer. We used to do this in the Soarer club all the time. Not sure if this will work on the IS, but in the Soarer you could just pull the DOME fuse for 15 mins instead of disconnecting the battery, and you wouldn't have to reset all of the crazy features which hate power failures. Quote Link to comment Share on other sites More sharing options...
LEX51S Posted September 28, 2011 Share Posted September 28, 2011 Thats really cool if what your saying is true platinum Jay, But if battery reset is the same thing . . . . not as interesting and its being talked up at the dealer.. an ECU reset is achieved by battery disconnect yes . . .BUT is that what they did or did they initiate some other "reset" Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted September 28, 2011 Share Posted September 28, 2011 battery d/c is a common trick used by most Lexus tuners in the US for our cars as we dont have a proven standalone or piggyback ecu available for our cars the reset does not have to be performed by a dealer it maybe done at home by disconecting the battery for a X amount of time this allows the ecu to reset it's previous map settings and relearn the mods that you have performed on your car ie. adding an intake will increase the amount of air going into the engine. it will take around 3 full drive cycles with a few WOT sessions (wide open throttle) you will find that once you have reset the battery your car will run different to how it was previously. most of the time it will be running rich. once you have driven a certain amount of km's the car will have learned the new mods and adapt a new fuel and air mixture. hope this helps Quote Link to comment Share on other sites More sharing options...
Platinum_Jay Posted September 28, 2011 Author Share Posted September 28, 2011 Thanks guys for your input. I didn't really ask in detail how they performed the reset. Most probably like what Atlantis and ilv1004s said, via battery disc. Perhaps a good habit to disc the battery each time we perform a mod? If anyone else tries this, do confirm the results. Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted September 28, 2011 Share Posted September 28, 2011 unless you do back to back dyno sessions it's hard to prove though your bum dyno may feel the difference Quote Link to comment Share on other sites More sharing options...
Platinum_Jay Posted September 30, 2011 Author Share Posted September 30, 2011 lol. Yea, pretty impressed with my bum dyno. Quote Link to comment Share on other sites More sharing options...
st87 Posted November 29, 2011 Share Posted November 29, 2011 In response to what Atlantis said about his Soarer, does anyone know which is the corresponding relay for an IS250? I can't seem to find one that explicitly says 'ECU' or similar. Also, which one would be for the front cigarette socket? I'm not getting a voltage across it so it might be a blown fuse there =S Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted November 29, 2011 Share Posted November 29, 2011 are you trying to reset your ecu? or trying to locate a blown fuse? Quote Link to comment Share on other sites More sharing options...
st87 Posted November 29, 2011 Share Posted November 29, 2011 Both. Reset ecu and replace blown fuse for front cigarette lighter =) Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted November 29, 2011 Share Posted November 29, 2011 ecu reset is simply done by pulling the negative terminal off the battery for 10-15 mins or so i think the fuse box for the cig lighter is located in the engine bay passenger side Quote Link to comment Share on other sites More sharing options...
st87 Posted November 29, 2011 Share Posted November 29, 2011 I was hoping for names. How many fuse boxes are there? I see the one in engine bay passenger side but there aren't that many fuses in there. I want to only reset the ecu and nothing else (from memory, I had to manually reset each window after the last time I pulled the battery) Quote Link to comment Share on other sites More sharing options...
LEX51S Posted November 29, 2011 Share Posted November 29, 2011 Ecu reset is as ilv1004s said. ( or positive terminal safer) There are four fuse boxes. Engine bay has two. One non serviceable (by driver / owner) and one accessible. One in passenger foot well and one in drivers footwell. See your manual for these details and the details of the fuse ur looking for. Quote Link to comment Share on other sites More sharing options...
st87 Posted November 29, 2011 Share Posted November 29, 2011 Oh wow. It's probably in one of them footwell ones then. I have seen a few posts suggesting reset via fuse instead of battery, but mainly in gs forums. Was rather hoping that I can do something similar on an is. Thanks lex51s Quote Link to comment Share on other sites More sharing options...
manny Posted November 29, 2011 Share Posted November 29, 2011 On prior Toyota and Lexus ECUs (like the Z30 Soarers) all that was required was removing the EFI fuse for 30+ seconds to reset the ECU. The benefit to this method over disconnecting the battery was that stuff like radio, mirror, seats etc memory presets are retained and you avoid having to reset power window limits etc. Being able to reset it quickly without any tools was another bonus as it was something that was performed by some on a weekly basis.... Quote Link to comment Share on other sites More sharing options...
st87 Posted November 29, 2011 Share Posted November 29, 2011 Yeah well I just got around to doing it (by disconnecting battery) with only half an hr towards bedtime. I think I got it disconnected for approximately 15 minutes. Hopefully it's enough to fully discharge any memory modules on the chip. The radio didn't reset (surprisingly) but I did get the power windows problem and had to initialize each one of them. Do you think the ecu has been reset? Is there any obvious way to tell that the ecu has reset? I think the time was still correct. Quote Link to comment Share on other sites More sharing options...
Atlantis Posted November 29, 2011 Share Posted November 29, 2011 Power windows need to be reset on every battery disconnect, so that's not a "problem" as such. Quote Link to comment Share on other sites More sharing options...
st87 Posted November 30, 2011 Share Posted November 30, 2011 But nevertheless annoying. I was wrong. Clock was reset. Do you guys think it worked? Didn't notice much difference with performance. Perhaps my driving is too consistent? Lol Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted November 30, 2011 Share Posted November 30, 2011 only way you can tell that it made a difference is when you put it on the dyno on our Last dyno run a member with a is250 made power gains every run untill the 10th run this was after a intake was installed and the battery was d/c for 10 mins or so he took out the highest IS250 class! Quote Link to comment Share on other sites More sharing options...
st87 Posted November 30, 2011 Share Posted November 30, 2011 Uh I hope I didn't read incorrectly, but you mean he did a reset between each dyno run and had power gains each time?? Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted November 30, 2011 Share Posted November 30, 2011 no battery was d/c'd while the intake was being installed then after that dyno run each WOT (wide open throttle) the car responded better we actually saw the fuel curve changing every run when it was making power from 107kwatw it made it self up to 120+ kw Quote Link to comment Share on other sites More sharing options...
st87 Posted November 30, 2011 Share Posted November 30, 2011 Hmm I really need to make time for the next dyno run event. Quote Link to comment Share on other sites More sharing options...
PRV Posted April 3, 2012 Share Posted April 3, 2012 Hi, I have just purchased a Greddy Exhaust. Can I ask whether you needed a new gasket to connect to the front exhaust system? Did you have any trouble fitting it? Any advice? Thanks. Quote Link to comment Share on other sites More sharing options...
Platinum_Jay Posted April 3, 2012 Author Share Posted April 3, 2012 Hi PRV, fortunately for me, LEX51S fitted mine. We used the same gasket and did not have any problems. Did you get the new Greddy SE with or without blue tips? Quote Link to comment Share on other sites More sharing options...
PRV Posted April 4, 2012 Share Posted April 4, 2012 Hi, thanks for that. I have downloaded some instructions from the US forum which should assist. I do not have blue tips as I believe that is now discontinued. I think the polished tips are more to my liking though (personal). Thanks for the reply. Quote Link to comment Share on other sites More sharing options...
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