oil starvation problem?

clintfocus

haha, first Cossie and i get in it about the VQ engine bearings and oil temps, now its him Vs Megan370z about oil starvation. Mental note, never get in a discussion with cossie about oil :P

Megan370z

no kidding , I just wanted to punch him last night.

But in the end we still proved our point which is what matter.
It can be resumed to a low probably risk but it is still a risk to run without it. and this also been supported by somebody else who has a lot more experience than me on this subject ( since I just started in 2007 on the track)

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clintfocus

historically on this forum, Cossie feels 250+ oil temp is fine for Vq37s and they will never oil starve (flame suit ENGAGED!)

Megan370z

I'm not gonna be involve in the possible war on this subject !

all I'm saying will be, there is a reason why Nissan decided to configure the ECU to reduce power starting at 220F and put a big limiter at 260F

It is relatively fine if using a good oil but not optimal.
As for oil starvation, the risk are low/very low. its far to be like those GM engine though !!!

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clintfocus

i knew about the 260+ limp mode, but didnt know about the power reduction at 220, if thats the case that sucks cause after just a warm up lap our oil is at 220 LOL even with my huge 34 row oil cooler (with shrouding) and CSF radiator LOL. im trying out another radiator next event, but i think im going to end up needed a second oil cooler core if i gotta stay under 220 for full power

cossie1600

I forgot you guys are the only ones that track seriously, how do I dare compare to my car to your superior machines. Speaking of which, I think it might be time to change oil after 4000 miles and 8 days this time. Car hasn't burnt much oil yet.

Your car must be setup differently. My car made basically the same power when it's oil at 190 or 250. Dyno and datalogs to back it up

Megan370z

not sure if serious now....


edit; wait a minute, you did say previously I was the only one that was tracking seriously my Z ...
Now , its me and Clintfocus.. that's not cool ! I will steal YOUR word and I am the only one !!!!!!!
So tomorrow you will add the next guy into the mix of seriously tracking our Z if someone want to jump in which wont necessary agree with you at 100%

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Megan370z

I was waiting for you to start arguing on me again

there it is;

I will answer to this losing power starting at 220F because this is what I found during dyno testing different stuff 2011.

this picture show 4 lines starting at 90C to 104C which is the last one (pink/purple)




soo now where is YOUR Data and facts ?????





EDIT; before you argue that my dyno sheet is false because it show over800 ft/pds wel take the number and divide it by the gear ratio

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clintfocus

did you not notice the smiley faces after my posts? HAHAH i've come to the conclusion we can agree to disagree on certain aspects of the 370z, im not trying to bash you :P

clintfocus

ive been tracking since 05 bro :P

Megan370z

its funny because im not the only one who found the Z had less power when the oil was at 240F which is below of your 250

I think it was Travisjb and pretty sure there was also another guy certifying this too.


Like you said, you car must be setup differently than ours, you might be right or Nissan gave you an awesome indestructible Z !! lucky you

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Shamu

I would like to challenge any of you who have done over 10 track events to tear down your motors and show us your rod bearings. Talking to those who build VQ race motors it's known that the lack of lead content in bearings starts to break down with oil temps above 240. We also know stock oil pan allows oil starve when cars are generating high Gs at high RPMs.

I was very easy on my motor no track events over stock redline and only ran a couple autocrosses with 8000 rpm redline and my rod bearings were shot. That's with a aM performance pan and big oil cooler. My motor felt great too but feeling great and causing real damage to rod bearings aren't too far apart.

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clintfocus

im sure my rod bearings are not in the best shape, from both tracking and the fact i have 65k miles, but i do what i can to keep things under 240. Its actually that our bearings have NO lead content since nissan stopped doing that since like 2000, the lead content helped for a more ridig bearing, the bearings we have NOW are more so soft and get even softer at 250+, my close friends (one of which is a mechanical engineer and has alot of Nissan race experience, and my other friend builds Nissan race engines) both tell me do what i can to stay under 250 oil temp. So yeah, im sure things arent all rainbows and cheese inside my motor, i think ill prolly have a rebuild done after this year, just check everything out and fresh/better engine bearings

cossie1600

You are so right. I just found the dyno sheet showed I made 3 HP less on my third run compare to the first one, except I should mention car was already over 220F oil temp from the first run since the guy had to make 4 runs prior to the official runs to get the RPM readings correct. The three runs were also done within a matter of a minute if you see the time stamp. Oh yeah, maybe the AFM has nothing to do with it. Three hard pulls in 4th gear from a stationary position must do wonder for the AFM too. As Clint said, the car is basically 220F as soon as you start driving on track. So maybe we all have a lemon that doesn't make full power on track.



I am sure my motor isn't as good as it was new. At the same time the car made enough power after 500+ autox runs (2.5 years), 25-40 track days (don't remember exactly) on the dyno. I am not going to worry or complain about it. Oh yeah it made 84% of the rated power with a bad clutch too, I will take that anyday at 29K miles. Similarly, my old 350 didn't have any noticeable power drop at 49K miles either (yes had dyno done too).

Megan370z

OHHH SORRY I MADE A MISTAKE
COSSIE 16 00 will you forgive me my dearly god !
you see I'm not afraid to mention it when I'm wrong not like some peoples ! I don't have that ego.


its not oil temp but water temp ! its been a while (3 years)I didn't talk about that subject somehow when I mentioned previously in this thread I was sure it was about the oil..... oups..... my bad

now if you want to argue on this, believe what you want !
but there was a reason why I wrote those temp on the sheet

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