Theres a second of shift delay when i upshift on my 2012 g37 ipl. I put it on ds mode but response is slow. Lets say if i rev it up to 7k rpm nd upshift the car will red line before it shifts gear and stalls out then shifts. I drove my friends 2010 infiniti g37s and use his paddle shifters, they responded better then mine. Why would that be? ECU issue?

 

your trans may need an update that maybe your friends has had done...more likely its just adapted to his driving vs yours has adapted to your driving...you could try resetting your ECU and driving it differently

 

I actually did that and it helped abit but is still there, i drove more aggressive. My friend with the g37s don’t really do anything for his car to perform better so he wouldn’t know about this update. Where would i be able get this ecu update?

 

IIRC its a TCU and not an ECU update but I'm not sure...go to the dealer...if your friend goes to the dealer for service it may have been done then or it may have been done by a previous owner vs on your car...for the learning after a reset it may take a while....depending on the mileage and maintenance history you may want to do a drain and fill of the transmission as well

 

FWIW adding some additional ground wires in the engine bay can sometimes help with shift response. You can buy a ground wire set which is fairly expensive compared to following the DIY's on this forum. I added them to my G a couple years ago and while the improvement was marginal, when talking about 1 second any help is positive. I think I ordered 25ft of 8g wire, braided sleeving, copper terminals, and heat shrink from Amazon all for about $30. Its easy to pay $100+ from companies to pre-make them for you.

 

Grounding kit. Plenty of members here that have had great results on the auto from installing one.

 

Thank you thats real helpfull i will take it to my tune shop in my area👍🏼. So i can understand it better why would adding grounding kit would help with response?

 

It's probably best summed up this way from this DIY thread https://www.myg37.com/forums/d-i-y-i...-your-own.html as debate erupted over its efficacy Team STILLEN responded this way:

 

Will i be straight with HKS brand grounding kit? Which cost only $20?
i seen stillen sells them also for $100
https://www.vividracing.com/-p-151103986.html

 

Built my own grounding kit with 25ft of 6g wire and some connectors. The response was marginally better, my car will take it’s sweet time shifting up close to redline (happened yesterday, scared the hell outa me when it stalled!!)

 

i wonder if just cleaning the oem points and sanding the terminals and bolt area would yeild the same results as a grounding kit

 

I think this is a good point and one thats often overlooked as people tend to install the grounding kit on these cars once they have been driven for a while and these grounds are in need of maintenance. that being said, one issue I found was that he OEM gorunds in a lot of places are made of such small gauge wire (eye balling them, they look like 22 gauge or something in that range) some of them just break off and even if they don't brake they could probably benefit from a heavier gauge wire. Also in a few instances (say the throttle bodies, theres just no OEM ground so it benefits that way too.

 

It won't help my car since it's been this way since day one. Never asked for ECU updates because I didn't want to lose the strong engine braking.

 

ANYONE can post link if grounding kit that would work i seen on amazon for around $20-30. Who ever bought from amazon or ebay or other page please post here. Nothing more the $40