8000k+ redline

KLRCADI · 04-19-2009, 04:02 PM

Many G37's have 8000+ rpm tunes and I have not read of any issues yet. +500 rpm should not be that big of a variance for stock springs. The VHR's were designed for High RPM operation. Typically valve float is a precusor to spring failure, and I have never seen a dyno showing any high RPM float. I've seen Technosquare Dyno's running past 8100. They all seem to make power climbing right until 8K. I look forward to seeing this soon from tuners.

wstar · 04-19-2009, 04:20 PM

Quote:

Originally Posted by KLRCADI

Many G37's have 8000+ rpm tunes and I have not read of any issues yet. +500 rpm should not be that big of a variance for stock springs. The VHR's were designed for High RPM operation. Typically valve float is a precusor to spring failure, and I have never seen a dyno showing any high RPM float. I've seen Technosquare Dyno's running past 8100. They all seem to make power climbing right until 8K. I look forward to seeing this soon from tuners.

What does valve float look like on a dyno run?

KLRCADI · 04-19-2009, 06:12 PM

Quote:

Originally Posted by wstar

What does valve float look like on a dyno run?

Typically spikey drops in torque over a few hundred RPM and no more real power being made past the bad harmonics. Also tends to go pretty rich on the AF side. Granted smoothing options hide it some, but usually shows up if its severe enough. The way these things are making power to redline and beyond, it's definately not happening.

MightyBobo · 04-23-2009, 06:45 AM

Quote:

Originally Posted by wstar

What does valve float look like on a dyno run?

Perfect example of valve float right here, on my 2000 Camaro:

See the sudden power drop off? Note, my RPM limits went up with a simple cam and valve spring swap. Stock LS1's were good all the way up to 7K RPM really, as long as the valvesprings could handle it, although ARP rod bolts were a solid investment

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04-19-2009, 04:02 PM	#1 (permalink)
KLRCADI Base Member Join Date: Apr 2009 Location: Toronto Posts: 11 Drives: 2005 CTS-V Rep Power: 17	Many G37's have 8000+ rpm tunes and I have not read of any issues yet. +500 rpm should not be that big of a variance for stock springs. The VHR's were designed for High RPM operation. Typically valve float is a precusor to spring failure, and I have never seen a dyno showing any high RPM float. I've seen Technosquare Dyno's running past 8100. They all seem to make power climbing right until 8K. I look forward to seeing this soon from tuners.