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.
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Originally Posted by 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 |
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).
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Originally Posted by 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 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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Quote:
Originally Posted by 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
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