nonsense. Pretendingtofgt is about to disprove the whole 1.8>1.6 myth
you guyths need to embrace da future |
Originally Posted by Braineack
(Post 1342314)
timing breaks rods.\
he didn't need all that horsepower to beat a c6. |
VVT.
you're welcome. |
Originally Posted by Braineack
(Post 1342346)
VVT.
you're welcome. |
As an aside, overboost protection won't cause a total loss in oil pressure. The oil pump is still spinning at ~6000rpm regardless of whether the injectors are on or not. You will lose some pressure briefly, but that's just because the bearings aren't as heavily loaded as they were a split-second beforehand. IOW, hitting overboost didn't break the rod, but ~300whp on a stock bottom end did :party:
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Originally Posted by Savington
(Post 1342355)
As an aside, overboost protection won't cause a total loss in oil pressure. The oil pump is still spinning at ~6000rpm regardless of whether the injectors are on or not. You will lose some pressure briefly, but that's just because the bearings aren't as heavily loaded as they were a split-second beforehand. IOW, hitting overboost didn't break the rod, but ~300whp on a stock bottom end did :party:
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Originally Posted by 1993z32
(Post 1342354)
But is it realllllyyyy worth it over a standard BP4W??
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Originally Posted by Braineack
(Post 1342383)
A standard BP4W isn't going to give you 150rwhp as a base...
it will make same power there is nothing wrong with starting with a 4w |
nothing wrong except that's it's missing out on a bucket full of mid-range and no extra top end (especially once you bolt up a square top) -- out of the box.
If youre going to do a motor swap, do it right. |
It really does make a huge, huge difference between 3000 and 4000rpm. I've posted charts comparing them before, since I had the same 2871R setup on a BP4W and a BP6D head. Especially with larger turbos, the difference is dramatic.
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Originally Posted by Braineack
(Post 1342417)
nothing wrong except that's it's missing out on a bucket full of mid-range and no extra top end (especially once you bolt up a square top) -- out of the box.
If youre going to do a motor swap, do it right. topend same. get your NB knowledge straight, old timer :giggle: |
Originally Posted by Savington
(Post 1342421)
It really does make a huge, huge difference between 3000 and 4000rpm. I've posted charts comparing them before, since I had the same 2871R setup on a BP4W and a BP6D head. Especially with larger turbos, the difference is dramatic.
Dann |
more? probably not. but having 300tq when running good tires and 3.6 final drive is pretty cool
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Originally Posted by 1993z32
(Post 1342361)
Yeah I'm not thinking the oil pressure had anything to do with the rod failure, I was thinking going from 235wtq into a full power cut and then back on boost was probably pretty stressful for the rods (rapid changes in torque?)
--Ian |
I think the boost cut was just coincidence. And it was doomed anyways.
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Originally Posted by aidandj
(Post 1342448)
I think the boost cut was just coincidence. And it was doomed anyways.
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Like most of the members on this site, they likely aren't straight ;)
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Originally Posted by 18psi
(Post 1342596)
Like most of the members on this site, they likely aren't straight ;)
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Originally Posted by 1993z32
(Post 1342593)
Just odd that it's been putting down roughly 240wtq for a year, and it was only making 230-235 all day, and after a very abrupt OBP limit it was game over. But it's anyone's guess really. I'm interested to see what the other 3 rods look like.
AIUI, most rods fail in tension (that's where they're weakest), usually at high-RPM with vacuum in the intake manifold (maximum tensile load), and it's not unusual for something that weakens a rod to result in it a seemingly random failure days or weeks later. FWIW, my stock motor had arrow-striaght rods when I took it apart, with 50K boosted miles on it, much of those at 250-260 rwtq. --Ian |
Originally Posted by codrus
(Post 1342598)
Where did you have the redline set? Did you rev it higher when upping the boost? Ever miss a shift and hit 2nd instead of 4th?
AIUI, most rods fail in tension (that's where they're weakest), usually at high-RPM with vacuum in the intake manifold (maximum tensile load), and it's not unusual for something that weakens a rod to result in it a seemingly random failure days or weeks later. FWIW, my stock motor had arrow-striaght rods when I took it apart, with 50K boosted miles on it, much of those at 250-260 rwtq. --Ian |
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