Please contact AK if you are going to launch a group buy first.

You are correct, a harness bar will not help crush points when "rolling your car", but its not meant to. Its about securing you in your seat from sliding back and forth, allowing you to gain FULL COMPLETE focus on the road itself vs constantly readjusting yourself in your seat. It also helps distribute the stress on your body vs having 1 belt taking all of the force, you have 2.

A harness is day and night vs an OEM seat belt. I autocross routinely almost every weekend of the summer, and when not autocrossing I'm at a road course event. I have go-pro vids of my oem belt vs my harness mounted behind me as well as on my helmet itself(went 3 years with an OEM belt before finally doing a harness w/ belt).

There's no way of getting around your knee bruises from the door/inner pillar besides knee pads, but watching your shoulders/head shift limitations from OEM to a harness isn't even funny. The amount of focus you can retain on the course is literally day and night. I knew within the first 30 seconds that my harness and bar was easily one of my top add-ons for the track.

The harness bar is the added support you need to safely/correctly mount a hardness belt. Also, the hardness bar allows you to still retain your OEM belts, making it easy to hop in and out for that quick drive around town.

Your OEM support bar in the rear is...just that, a support bar. Its not strong enough to hold a belt. Replacing the OEM bar(Robispec) is not optimal as the max you want the mount to be is 20% from the seat openings.

Did you know that that if you are wearing a 4 point harness, sitting in a racing seat and roll the car you are going to be paralized/killed? It will hold your spine straight up in the seat

Its all in the install my friend, and if you are this concerned about rolling your car, I highly suggest you do a full cage :tup:

You know that if you do a full cage it isn't safe to drive without a helmet and all the belts on (which is illegal in every state). some body hits you at 15mph and your noggen hits one of the bars and your done.

There are race safety systems, there are street safety systems, there is currently nothing in between.

don't even mention bar safety foam, because even the cockpit stuff is rated to not break a HELMET not your skull

You are literally the only one in this thread talking about rolling your car and full cages.

We are talking about the best alternative to a full all out rollcage.

I know the point of a 4 point harness, I don't know the point of a harness bar. Also the way that thin steel bar is done is just like the subie/evo bar and in an acciden the two bolts lower to the belt snap, the bar rotates on the other two where the seat belts were and the occupant goes flying out the windshield. Has happened several times on and off the track on other cars.

Also I should note that 4 point harnesses are stupid and you will be F'd up if you crash, you need to have an anti submarine belt when using rigid mounted shoulder belts.

Throwing this in for some info http://www.ogracing.com/blog/2013/02...ing-harnesses/

1. You don't understand the point of the bar? The harness bar is meant for a safe and up to standard way/location to mount a harness.
2. I personally run the Schroth Anti-Submarine 6 point
3. The bar has no way of rotating in the 370. This is not an Evo/Subie. The 370's roofline is too low, and the support bar and actual subframe would never allow the bar to rotate around as you're suggesting.
4. Thank you for all of your concerns, any other questions I can answer or arguments you would like to throw my way, happy to help :)

1. No it's not. Paper thin sheet metal the bars attached to is not up to standard! It was never engineered to be used like that. Make that bar 3" solid steel, it doesn't matter. Run a cable out your front window and pull at least 4G's on that bar, bet the sheet metal tears like paper.

yup so driver + passenger + weight of the seat back + the weight of the belts * 6 applied to the bar where the harnesses connect and watch what happens. NO ONE actually crash tests these things to know what it is going to do in an accident. The amuse bar is a F'n death trap, the robispec bar is probably the closest thing to strong enough but in an accident who knows.

This is a pretty good bar that uses the factory mounting points. I am thinking about using it for autox. For $200 bucks its worth a try.
2009-2014 Nissan 370Z Cipher Racing Black Coating Custom Harness Bar [CPA5011HB-BK] - $229.00 : Cipher Auto!, Automotive Parts Accessories & Universal Racing Seats

Definintely not bad for the price, but few things stick out immediately to me(just my opinion):

-The bar looks like its right behind your head?resisting how far the seat goes back?
-The harness anchors are off centered?
-The structure of the mounting points look kind of half a$$ed, making up for lack of engineering and fitment
-The bar itself is actually 3 connecting bars (multiple screw connection points = weaker supporting bar)

I found this great harness bar, it's called the auotpower race rollbar

Yeah its right behind the seat but I don't think it limits how far you can recline. And if you have a bar what are you doing reclining back that far? :-)

Good point about the anchors being off centered, I didn't even notice that.

The mounting points arent perfect but I think they are better than that of the robi bar. I say that because those points are designed to be load bearing points and should be safe in a crash. If the bar is safe is a whole other question.

I actually completely disagree. The bar was very well engineered for this not to happen. All of the forces being applied to the bolts are in sheer, and the steel is 350mpa CDW roll cage tubing. If the lower bolts (M8, 130mm long, grade 12) and the spacers are used, the bar physically cannot pivot downward. Also, bolts actually replace OEM mounting points of the support bar to the frame(strongest points of the car), zero drilling/modifying needed.

Here are a few photos in the raw of the actual connection points. You'll see that they do not go into the "support bar" which is very thin which is not recommended to support harnesses, rather they go into the actual supporting joints to hold in the support bar which are much thicker. Also, they bar goes back far enough to fully be prevented from rotating downward in the event of an accident, so all of this talk about it rotating around in the event of an accident, is irrelevant.



Take a peak at the difference between the bar you posted and this one in the same raw stage. The bar is solid from end to end, and comes backward with sheer connection points focused on quality and safey.

http://i18.photobucket.com/albums/b1...ps34c4c2cf.jpg