redline/peak H.P/ & H.P curve-When to shift?? :) intresting???

Rusty · 09-05-2013, 10:42 PM

Quote:

Originally Posted by Sh0velMan

Can you post ANY relevant information on this, or is this more "Lightweight Pulleys are the debil" hearsay?

And by relevant, I mean at least two VQ37VHR's with lightweight pulleys and oil pump failures at 'Normal' RPMs (ie, not revved to 9K where they blew up... revved to 7500-8000 where they blew up).

It's just my opinion. Connecting the dots more or less.

From some things that I have read. Seen first hand. Experienced myself. Like breaking a forged crankshaft in a Chevy LT1 I had some years ago. Having some friends who broke the oil pumps on their Hemi's.

Elmo370z · 03-09-2016, 03:23 PM

Got a reply back from.onpoint dyno about the 370z crank on his 9,000 rpms 350z

Elijah Morris Yes in endurance racing the 370z crank can not withstand extended 8700+ RPM use. However, for how little we run this engine the OEM crank is fine for 9000rpm. We generally don't leave the engine alone for more than 20-30 hours of run time, so it's not of much concern to us. However, real endurance racing teams have since switched to a forged crank for extended use, and most significantly the durability to withstand some driver-error enduced over-revs to 10,000+ rpm."

Chuck33079 · 03-09-2016, 03:36 PM

Ah, an old Andre thread. He was so entertaining.

His post history is quite a read.

03-09-2016, 03:36 PM	#3 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Ah, an old Andre thread. He was so entertaining. His post history is quite a read. 2011 Nismo#91 likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

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03-09-2016, 03:23 PM	#2 (permalink)
Elmo370z A True Z Fanatic Join Date: Apr 2013 Location: st. petersburg Posts: 5,725 Drives: 09 nissan 370z Sp M6 Rep Power: 295379	Got a reply back from.onpoint dyno about the 370z crank on his 9,000 rpms 350z Elijah Morris Yes in endurance racing the 370z crank can not withstand extended 8700+ RPM use. However, for how little we run this engine the OEM crank is fine for 9000rpm. We generally don't leave the engine alone for more than 20-30 hours of run time, so it's not of much concern to us. However, real endurance racing teams have since switched to a forged crank for extended use, and most significantly the durability to withstand some driver-error enduced over-revs to 10,000+ rpm."