Reprogramming ECU for bigger wheels??
Posted: Sat Nov 09, 2013 11:42 pm
Sorry if this has been discussed before, but my search was fruitless. Anyway, I had bigger wheels fitted when I purchased my Pathy. As most others did when putting bigger wheels on, I fitted 265/70/17 BFG A/Ts. What I did not realize back then was that the bigger tyres influenced the auto gearbox. I was never happy with the way the gearbox operated, but learned to live with it. What irritated me was the fact that it would never lock up in 5th when cruising. That all changed about 3 months ago and I could not figure out why it started to lock up in 5th. I kept quiet as I did not want to jinx this bit of luck.
I started Googling for an answer and stumbled upon this article: http://www.4wdaction.com.au/articles/2012/pathmaker What caught my eye was this:
Well, I chatted with some people about this and some mentioned that the ECU of certain vehicles can be reprogrammed so as to calculate torque converter settings for larger tyres. Does this sound plausible or am I barking up the wrong tree?
I have not gone to my local Nissan dealer to hear if this can be done for the Pathfinder as I would like to go there armed with the appropriate info. Have any of you guys asked your local Nissan dealer if the ECU can be adjusted for larger tyres?
TIA
I started Googling for an answer and stumbled upon this article: http://www.4wdaction.com.au/articles/2012/pathmaker What caught my eye was this:
So now I had the possible reason for the gearbox not wanting to lock up before and the tyres wearing down to almost standard size (That is after 3 years of driving and 70 000km) made the gearbox locking up again."I did get a bit too excited fitting KM2s in 285/65 (32in) sizing, Brendan explains. These seem to put a bit of strain on the car and its attraction to service stations.
Brendan also found that the five-speed auto started to hunt through the gears and didn't want to lock up in fifth"
Well, I chatted with some people about this and some mentioned that the ECU of certain vehicles can be reprogrammed so as to calculate torque converter settings for larger tyres. Does this sound plausible or am I barking up the wrong tree?
I have not gone to my local Nissan dealer to hear if this can be done for the Pathfinder as I would like to go there armed with the appropriate info. Have any of you guys asked your local Nissan dealer if the ECU can be adjusted for larger tyres?
TIA