Lets see your aftermarket seats!

CarbonFZ

any other options? that might be a bit easier to do?

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Wiggins3377

Amuse makes a strut bar replacement that also serves as a harness bar. You're looking at about $1,000 for that version, but it's very pretty and its JDM (if you like that kind of thing). Check out Simota1's build thread. Contact Bo at 370ztune if you want one.

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CarbonFZ

i meant to get rid of the seatbelt/aierbag lights haha

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IGoFast1589

I would be hesitant to do a fixed back bucket seat and a set of harnesses at the same time. In a sudden impact where you're slowed down instantly the only thing that will move is your head and you'll definitely break your neck. I would only consider a seat retaining the factory belts. Race car safety equipment is designed as a system. Roll cage, seats, harnesses, HANS device... It's like those guys that get roll cages on a street car and just leave open, exposed metal tubes without wrapping them in foam. Without a helmet, HANS device and harnesses you'll end up cracking your head open like an egg.

wstar

Unfortunately, the simple truth (which we could have pages and pages and pages of in-depth discussion about, but...) is that safety system conversions are best thought of as a binary proposition. Either you leave it all stock, or you go straight to stripping out the stock airbags/belts/seats, installing a full 6-point cage, 6-point harnesses, and fixed racing buckets (and always wearing a helmet, and maybe a neck device as well).

I wish it weren't the case, I fought a lot with wanting various halfway options as my car progressed, but there's always a big safety downside to any halfway solution that tries to mix the stock and racing configs. The only halfway option I did before I went all out was using some reclinable semi-racing seats with high bolsters (tradeoff was loss of side airbag, not huge), while still using the stock belts.

Not really true. It will be rougher than stock on you, but even racing harnesses do flex and stretch under impact loads (I've seen figures as high as 12" of stretch movement quoted somewhere, in a direct high-speed frontal hit). Almost everything flexes and stretches to some degree in an impact, even sheet metal and "fixed" seats. The notable exception is the rollcage itself (or anything else equally stout, but on a lightweight race car there won't be much else).

Just keep in mind that even wrapping in foam doesn't protect your bare head from a cage. The right kind of foam for cages is high-density stuff, which is designed to make your helmet less likely to crack, but still feels pretty much hard as a rock and will still damage your head pretty badly without a helmet. The wrong kind of foam (the soft stuff like a pool noodle that you see people use on Jeeps and whatnot) will protect your bare head when you accidentally bang into the bar getting in and out of the car, but may as well be a sheet of paper if you impact the bar with your head in a wreck.

Even the lower bars of the cage near the footwell are dangerous - your legs flopping around in a wreck can break a lower legbone against one if you don't at least pad them. On real race cars I've seen them just line the outside of the footwell with a big solid sheet of aluminum and/or a big fat high-density pad to prevent that. Cage bars simply don't give at all, so whatever hits them has to break.

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7AT Track Car!
Journal thread / Car setup details

sig11

I run BGTV8's harness bar. I think he bought the tooling from the shop that built them but I doubt it would be very cheap to get another made. It's safety calculation you should make yourself though. As an FYI I had no problem with NASA inspections for HPDE and I doubt there would be any issue with it in TT either.

synolimit

Still disagree. The cheap thin sheet metal the bars bolted to is not meant to withstand your body at 2-3-4-5-6-7 etc G force pulling on it when you smash into a wall. The bar can be tough as **** but the sheet metal will be no different than paper at high speed. You're going to break your face on the steering wheel.

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13 370z-

GaleForce

The harness bar I'm talking about bolts to the upper seat belt bolts and anchors at the rear strut tower area. Or are you talking about the Robispec type bar that replaces the factory bar in the hatch?

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synolimit

Pics?

I thought sig11 was talking about a robispec type.

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13 370z-

GaleForce

Check this thread to see the harness bar I'm talking about. 370Z Harness Bar

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TerribleONE

Here's a picture of mine I took the other day. stradia II Reims edition

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1slow370

There were also isues with proper mounting of the lap belt and drivers seat there too. lap belts and seat mounting are supposed to be strong enough to prevent windshield ejection in the event of the upper harness failing. that or his lap belt wasnt tight.

Edit: the upper harnes is to keep you from eating wheel/dash and hold you back in the cage incase the roof colapses

Edit: also the bar in your pic is legal per scca solo rules not in higher classes though it is a C-type with 2 bolted frame connections and 2 supports.

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sig11

Yeah. BGTV8's bar is mounted in the upper seatbelt holes without a secondary bar. I also have properly mounted lap/sub belts. They're still legal for NASA HPDE/TT either way.

1slow370

actually straight bars are solo legal with two connections, c type sedans require 4 points so his bar is probably legal

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wstar

For a normal 5/6-point, you can use the stock outer-lower seat belt mounting holes for the outer lap belt mount, but you need to weld in reinforced threaded mounting plates for the other 2-3 (inner lap belt + anti-sub strap(s) below the seat). Some mfgs make alternate belt setups that make some compromises in the name of being safer and more stock-compatible without all the welding, e.g. Schroth.

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