Quote:
Originally Posted by juld0zer
I need to get a windows laptop or netbook to do some extended datalogging to see what exactly happens when the lag hits.
It does feel like the timing is being pulled because the sensation is the same as when i used to get extreme heatsoak.
I am running 5w40 oil at the moment. Here in Australia, Nissan sells their own oil and i've used it for most of the time I've had my car (about 3 oil changes). I've used Castrol Edge 5w30 (with titanium fluid strength tech - we don't have any other Castrol Edge on the retail shelves here) and i noticed the oil temps were generally cooler by 6*c compared to the Nissan oil.
My most recent change i used Nulon 5w40 and it actually takes effort to get the oil temps up to 90 and beyond. Oil temps are cooler than with Castrol Edge. Most of you guys haven't heard of Nulon before as it's an Australian brand but i'm unsure if they export it.
I dont have any datalogs to prove a difference but i was getting hesitation around 3500-4000rpm (felt unwilling to go beyond unless the pedal was pressed further). Now i get a seamless pull all the way to redline. It felt like the CVTC system wasnt getting enough oil pressure with the Nissan oil so it wasn't functioning properly. Below 3500rpm the car ran fine. I'm very happy with the Nulon oil. I might try their Euro formula 5w30 to see if running the correct viscosity oil will still keep it happy. It does amaze me that Nissan specs 5w30 worldwide. I feel for all those folks who live in the hotter regions of the world like the UAE etc.
Thanks for all your replies guys  Really appreciate your input! I wonder if there is any function in Uprev to disable the oil temp related lag...... |
One other thing to consider: There is actually a coating on the valves that appears to work especially well with Ester based oils -- strictly from a mechanical standpoint, we've seen no clear evidence of better power or less wear using non-ester oils, though the system does tend to be a good bit more chattery with non-ester oils. Arguably, less chatter could be indicative of better lubrication (allegedly the coating reduces friction by being more slippery at the molecular level when lubed with Ester based oil).
All of this is a bit controversial, hotly debated, etc., but if nothing else, the system is clearly tuned to err on the side of self-preservation, so little things like that might manifest in small hiccups like that here and there.
Beyond that -- the OEM throttle maps are notorious for being rather laggy -- check out the smooth throttle for uprev thread for discussion on this issue.
As a final note, I ran a (0 weight) Castrol oil at one point and thought temps tended to run a bit cooler -- buuut much more chattery and some evidence of extra engine wear in UOA's relative to what I found using Redline 5W30 (an Ester blend, BTW), which what I have switched to and stuck with (see further the "Oil Nerd's thread").