CJM (Justin's) drag build

phunk

Stock Nissan bolts are TTY (torque to yield) fasteners, thus are not tightened to a torque spec. It is a different type of strategy for fasteners. After a uniform 30# is set they are tightened an additional 270 degrees (135+135).

VR fasteners are 1mm larger thread diameter than VQ fasteners. M12 vs M11.

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Spooler

Things that make you go hmm.

phunk

For what it’s worth, the stock VQ fasteners spec is 30# + 190 degrees (95 + 95).

That’s 80 degrees more rotation in the VR fastener over the VQ. They are both 1.25mm thread pitch, so that simplifies the pondering a little.

Being the same thread pitch is the only reason we could do it without going even larger then bringing it back down with thread inserts. Drilling up 1mm doesn’t clear out the original threads. But since they are the same pitch, we could carefully start the m12 tap in what was left of the original threads to oversized them just 1mm. It takes great care.

Also, the bolts are MUCH longer.

Then making them fit the heads was a whole other adventure. We made a fixture for mounting the heads into the CNC for machining programs to be run on them.

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Elmo370z

I’m over here just trying to get a twin pump

Rusty

phunk thinks on another level when it comes to the Z.

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
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gbrettin

Did someone say something about twin pump?!?!

Spooler

Justin, are we done yet. I have seen some pictures on CJ Motorsports Instagram page. It appears to be real close.

phunk

The car runs but currently cannot drive due to a clutch problem. The components are too warped to allow disengagement. The car sits awaiting clutch rebuild components from OSG.

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Rusty

Your ears must be burning. ZS and me was just talking about this car last night.

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
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Spooler

That's because I posted on Phunks Instagram account yesterday. LOL At least I was not the only one with Clutch issues.

phunk

Ya a lot of effort was wasted looking at the hydraulics since that is usually the culprit when there are clutch problems on this platform. But Justin replaced the whole system and there was zero improvement. So attention has shifted to the clutch. Since the clutch seemed fine between the last abuse it saw at the track up until he pulled the engine, nobody really even looked at it. Perhaps it was damaged during transmission removal or installation. Or maybe the warpage became more of a problem if the clocking of the disks during reassembly didn’t match their original clocking when they warped? Who knows.

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phunk

There seems to be no photos really of the build here. This is a semi-recent photo. The hood does shut, and has no holes in the hood skin. The underside has a bunch of stuff cut out though to clear the throttles and tubes. Strut bar does fit fine, just have to space it up a little bit with some washers.

Attached Images

6FB2B3AA-E4D9-4E3F-A577-11510A3D7315.jpg (171.1 KB, 111 views)

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Rusty

On the top piece that you cut out for tube clearance, where the hood latch is. You going to make a new piece to tie everything back in?

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

phunk

I havent seen the car in a couple weeks, I am not sure where he is at with the front end. I know when this pic was taken there was still more pieces to go back in, but I dont recall anything that wasnt stock going in there.

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Spooler

Waiting for the updates. LOL