I did a search for this, but didnt find the thread I was looking for. Sometime back, I read that there is a dealer installed ECU upgrade to bring the 2003.5 to the 2004 code. Apparrently this will improve shiftpoints and eliminate the dreaded hesitations the 5AT is known for. I'm tired of hitting the rev limiter in Manumatic waiting for this turd to shift. Anybody know what I'm talking about or was I just smoking crack?

 

The upgrade is on the Infiniti Asist program .They have to load it into your ECU with Consult .Tell your dealer that its shifting slow and you know they have an upgrade in Asist . # 31036-AL013 . Tell them to open Asist program , click on the Info, tool box icon , then click on Consult Utilities , then click on ECM/TCM Data icon , then choose G35 and model year 2003 , the Al004 software will appear with other revisions for the ECM , both coupe and sedan .Just load the software on Consult and in to your ECU , tell them just like they do with the I30's...take about 20 minutes for the whole thing .Telling them it shifting slow at heavy throttle should get it done under warranty.....It did help the car shift alittle faster and harder...good luck.....OH...the #.....31036-AL013 is for the coupe....dont know the # for the sedan...but its there

Couldnt afford it when young...gonna play when Im old

 

U da man. Thanks. Taking it in Thurs. for LOF and 30K brake warrantee deal. We'll see if they can figure out the tranny. Great mechanical unit, just buggered up code.

 

Wow, old thread, but AWESOME! I'm doing this ASAP!