Spohn's Journal

wstar

Arguably, a harness bar is always a bad safety idea.

In stock configuration, the safety design with regular seatbelts is that in the event of a rollover, your body can fall to the side a bit as the roof crushes in on you. Once you strap into a 4+ point harness, you're immobilized from falling to the side, and in a rollover without a rollbar your head will take the weight of the car and your spine/neck gets compressed/crushed.

Combining that with what I said above, it seems like the only combined options that don't seriously compromise safety in some situation are:

1) Stock everything
2) 4-pt rollbar + harnesses: still streetable w/o a helmet, can choose harness-vs-seatbelt usage regardless of helmet status (or completely remove seatbelts and go full-time harness).
3) >4-pt cage: not streetable, always requires a helmet + harness.

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7AT Track Car!
Journal thread / Car setup details

sig11

I realize this but it's a matter of gambling over the likelyhood of a rollover and how much one extra hoop will protect you in that rollover. :P I've gone back and forth on it and it mostly comes down to how serious I want to get in this car!

Unique_Z

wow 4 point

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My Z Build
UniqueZ

SPOHN

Here's a pic taken at Forged last week. I know some of you guys are awaitng pics of my roll cage. They will be posted tomorrow after I pick up the car.

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onzedge

Nice shot. ^^^

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Koni|Swift|Michelin|Motordyne|Berk|RJM Performance|Gates|SPL|Motul|Technafit|Ate Super Blue|Hawk
Tommy Kaira|Momo|Optima|Hella|Hotchkis|Red Line|ZSpeed|Stillen|B&M|H&R

Baer383

Looks good stig!!!

Can't wait to see those seats,cage in person

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2013 ZL1

754 rwhp 747 rwtq

Ron

I love ur wheels...AME is back in business right? Any idea how much a set like those run for?

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2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread
[ GTM GTX Stg2 TT || HKS EVC6 || Custom CarPC || F.I 3'' TDX CBE || SB 6puck clutch/ZSpeed CSC || BC BR Coilovers || SPC camber arms || Work VSS-X || Custom Headlights || PW:JDM CF Covers || Seibon CF Engine Cover ]

SPOHN

I didn't really know they were out of business. I got mine from SpeedElement. They might have a set in stock still. Mine were about $2600. They used to be offered cheaper but the Yen keeps going up in Japan.

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Ron

Good price, thanks man

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2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread
[ GTM GTX Stg2 TT || HKS EVC6 || Custom CarPC || F.I 3'' TDX CBE || SB 6puck clutch/ZSpeed CSC || BC BR Coilovers || SPC camber arms || Work VSS-X || Custom Headlights || PW:JDM CF Covers || Seibon CF Engine Cover ]

SPOHN

Link to my roll cage install

Forged Performance: SPOHN's Custom FP Spec 4-Point Cage

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simota1

i GOTTA get a welding jacket like that guy MILLER FTW... i got the same helmet lol btw the cage looks... sooo freaking pure sex man pure sex

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onzedge

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Koni|Swift|Michelin|Motordyne|Berk|RJM Performance|Gates|SPL|Motul|Technafit|Ate Super Blue|Hawk
Tommy Kaira|Momo|Optima|Hella|Hotchkis|Red Line|ZSpeed|Stillen|B&M|H&R

Baer383

Looks great Chris now if we can only get you to drive correctly.

Just having fun with the STIG

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2013 ZL1

754 rwhp 747 rwtq

wstar

The 4-point Forged put together turned out pretty awesome.

I'm getting closer, I've stripped down my car from the backs of the seats on back and all of the side-plastics in that area, but not the headliner. Been staring at it for a couple of days and reading up on various rules and regs and safety issues so that I at least have some idea in my head what the right design should be. Then I'll head to a local shop or two and see if I can find someone I'm comfortable with to do the work (Forged is a bit far heh).

Got a couple random Qs:

1) What was the idea behind standing the harness bar off to the rear like that? Most I've seen keep it in-line with the main hoop? Just to avoid the X-shaped intersection with the diagonal and inherent weakness that comes with chopping one of the bars for that intersection?

2) Where you put the bottom mounts of the hoop makes a lot of sense, and seemed like the best option to me when I'm looking at mine as well. But, was there any argument though, for moving the legs forward a few inches and going to the lower floor (level with the bottom of the seat rails, in other words)?

Seems like it would possibly cut into your seating space (moving the seat forward another inch or two) to try that, but on the other hand the spot you've chosen makes me wonder about adding lower door bars later, or directly mounting seat rails to square-tube floor extensions from the cage (both seem easier with the main hoop going all the way to the lower level).

3) Also, what was the factors that went into settling on 1.75x.095? I've been waffling between a few different dimensions of DOM looking at different regs and things and hoping I don't have to rip out my 4-pt a year or two down the road just because I end up trying out some event/series or other with different rules than I expected.

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7AT Track Car!
Journal thread / Car setup details

travisjb

Excited to see you guys caging your Z's! (:

I'd likely to strongly recommend that whoever you hire - pick them from among the guys that routinely build cages for the sanctioning body you will run with. Consider calling up your regional NASA and SCCA directors and ask each of them for the names of three guys. Pick from that group. Just going to any old fab guy that tells you they can do it is asking for rework or worse.

I'm sure WSTAR you were planning to do this anyways, and you are always meticulous- so my input is as much for everyone else.

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2009 370Z #104
*For Sale*