Harnesses in stock seats?
#3
Registered Tracker
Thread Starter
Join Date: Feb 2004
Location: Chicago
Posts: 3,295
Likes: 0
Received 0 Likes
on
0 Posts
Thats the thing, I rode in an EVO that was running harnesses thru the inserts on the stock seats, I don't mind buying race buckets, but I would like to explore my options first.
#8
Registered
Join Date: Oct 2004
Location: Florence, KY
Posts: 329
Likes: 0
Received 0 Likes
on
0 Posts
I've already investigated this. Harnesses will be UNSAFE with our stock seats. Running them through the holes in the seats will not work for obvious reasons and running the belts over the shoulders of the seats puts them to far out. In a crash, they would slip down and not provide any upper body support at all.
In addition, it was determined that harnesses are unsafe to use if your car does not have a rollbar. In the case of a crash with stock 3-point belts, if you land upside down and the roof comes in, your body can bend away. With a 4 or 5-point belt, you are held rigidly upright and your spine would be compressed. That would be bad.
I really wanted to get a set of harnesses, but I sought advice from experts (DE instructors, racers, harness distributors), which I have just summarized. My recommendation, and what I have been doing, is to back your seat up a few notches. Grab your belt and (with it already latched) draw it in as tightly to your body as possible. Then snap it out to lock the retractor. It may take a few tries, but you'll get it. Then lean forward so you keep pressure against it while you either push the power seat forward, or pull it forward with one hand on the wheel or door and the other releasing the lever. You'll be amazed how tightly you can draw yourself in. This is a million times better than that crappy CG Lock, which gives you no upper body support. You'll probably need to get a set of those ricer shoulder pads to use when you do this. I got a set of MAZDASPEED pads that were given to me. Schroth makes some really nice ones, though.
In addition, it was determined that harnesses are unsafe to use if your car does not have a rollbar. In the case of a crash with stock 3-point belts, if you land upside down and the roof comes in, your body can bend away. With a 4 or 5-point belt, you are held rigidly upright and your spine would be compressed. That would be bad.
I really wanted to get a set of harnesses, but I sought advice from experts (DE instructors, racers, harness distributors), which I have just summarized. My recommendation, and what I have been doing, is to back your seat up a few notches. Grab your belt and (with it already latched) draw it in as tightly to your body as possible. Then snap it out to lock the retractor. It may take a few tries, but you'll get it. Then lean forward so you keep pressure against it while you either push the power seat forward, or pull it forward with one hand on the wheel or door and the other releasing the lever. You'll be amazed how tightly you can draw yourself in. This is a million times better than that crappy CG Lock, which gives you no upper body support. You'll probably need to get a set of those ricer shoulder pads to use when you do this. I got a set of MAZDASPEED pads that were given to me. Schroth makes some really nice ones, though.
#9
cry me a river...
Join Date: Dec 2003
Location: Syd / Melb
Posts: 4,475
Likes: 0
Received 0 Likes
on
0 Posts
https://www.rx8club.com/series-i-interior-audio-electronics-24/modifying-stock-seats-72611/
if it was a real EVO, then it must have the recaros, which means there are already two openings towards the top of the seat for the harness to go through.... provided it is fixed behind the front seats on either a approved roll cage or rear chassis floor (engineering required)
if it was a real EVO, then it must have the recaros, which means there are already two openings towards the top of the seat for the harness to go through.... provided it is fixed behind the front seats on either a approved roll cage or rear chassis floor (engineering required)
#10
He's as bad as Can
Originally Posted by RX8SpdDmn
In addition, it was determined that harnesses are unsafe to use if your car does not have a rollbar. In the case of a crash with stock 3-point belts, if you land upside down and the roof comes in, your body can bend away. With a 4 or 5-point belt, you are held rigidly upright and your spine would be compressed. That would be bad.
#11
Registered
Join Date: Oct 2004
Location: Florence, KY
Posts: 329
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by expo1
Are you also saying that a 4 / 5 point mounted to a harness bar would also be unsafe if use also used aftermarket seats with the proper cutouts for the belts? I was thinking about getting a harness bar made that would bolt to exsiting seatbelt mount points.
#12
Modulated Moderator
iTrader: (3)
Originally Posted by RX8SpdDmn
Yes, that's what I'm saying. If that harness bar is not also a roll bar, then you're actually endangering yourself if you flip over. If you just want to use it for autocross, then you're fine, but it is not advisable for the track without a full bar.
I would use a harness to hold me in my seat....something the stock seatbelt does not do. If I was racing...I would not do it without a full roll cage, and the appropriate harnesses.
SO at 9/10ths...in a HDPE...I will try the harness as discussed above
#13
Registered
Join Date: Oct 2004
Location: Florence, KY
Posts: 329
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by dannobre
I guess you have to decide what your chances of a rollover in the type of track driving that you do. From my point of view...the odds of me having a rollover type accident in a HPDE in my 8 is close to zero....
#14
Registered
Join Date: Dec 2004
Location: Lake Forest, IL
Posts: 978
Likes: 0
Received 0 Likes
on
0 Posts
I'm skeptical that the seatbelt trick would work for an entire 35 minute session. I've tried it during autocross runs in other cars and sometimes it wouldn't even last for a one minute run. I tend to drive with my seat almost all of the way back so it's hard to keep the tension on the belt.
A follow-up question, if you had a rollbar, could you mount harnesses and keep the stock seats?
Another nice thing about harnesses is you can use a Hans device with them. I don't think the Hans device works without harnesses.
A follow-up question, if you had a rollbar, could you mount harnesses and keep the stock seats?
Another nice thing about harnesses is you can use a Hans device with them. I don't think the Hans device works without harnesses.
#15
Registered
Join Date: Oct 2004
Location: Florence, KY
Posts: 329
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Machan
I'm skeptical that the seatbelt trick would work for an entire 35 minute session. I've tried it during autocross runs in other cars and sometimes it wouldn't even last for a one minute run. I tend to drive with my seat almost all of the way back so it's hard to keep the tension on the belt.
A follow-up question, if you had a rollbar, could you mount harnesses and keep the stock seats?
Another nice thing about harnesses is you can use a Hans device with them. I don't think the Hans device works without harnesses.
A follow-up question, if you had a rollbar, could you mount harnesses and keep the stock seats?
Another nice thing about harnesses is you can use a Hans device with them. I don't think the Hans device works without harnesses.
If you have a roll bar, you STILL need to change your seats to accomodate a harness. As I said before, you can't go through the hole because it's in the middle of your neck, and you can't go around the outside because they're a little too wide and would slip right down in an accident, doing less to protect you than your stock 3-point belt would.
It sucks!! I really wanted harnesses, but can't justify all the money, especially the roll bar!
#16
Registered
Join Date: Dec 2004
Location: Lake Forest, IL
Posts: 978
Likes: 0
Received 0 Likes
on
0 Posts
http://www.ioportracing.com/Merchant...ory_Code=AP593
These are some of the roll bars that I was looking at.
Having ridden in BlueRenesis82's car on the track, I suggest he get a rollbar
These are some of the roll bars that I was looking at.
Having ridden in BlueRenesis82's car on the track, I suggest he get a rollbar
#18
Registered User
https://www.rx8club.com/showthread.p...hlight=harness
I use the Harness for AutoX. At AutoX speeds they are sufficient. I do not use them for track days, however, as they are very dangerous without a roll bar. Do a search for G-Force lap belt. It will hold you in for those "higer speeds" found at time trials/HPDE.
I am also looking into getting the Autopower roll bar for our car and a new seat. This would also mean new 3" belts.
I will repeat. You SHOULD NOT USE A HARNESS ON A CAR THAT IS NOT EQUIPPED WITH A ROLL CAGE.
I use the Harness for AutoX. At AutoX speeds they are sufficient. I do not use them for track days, however, as they are very dangerous without a roll bar. Do a search for G-Force lap belt. It will hold you in for those "higer speeds" found at time trials/HPDE.
I am also looking into getting the Autopower roll bar for our car and a new seat. This would also mean new 3" belts.
I will repeat. You SHOULD NOT USE A HARNESS ON A CAR THAT IS NOT EQUIPPED WITH A ROLL CAGE.
#19
The "move the seat back, yank the belt to lock it, and move the set forward" method can work out pretty good, but it can also be very uncomfortable.
Another approach is to only install the lap belt portion of a racing harness. I've autocrossed another guy's Miata with a good wide lap belt under the stock 3 point, and I found it made a big difference in holding me into the drivers seat. He simply mounted a Crow racing belt to the two rear bolts that hold the seat into the car! Cheep and easy! And when you roll your Miata, you can simply lie down across the passanger seat, safe and sound!
It's a lot easier to think about the course when you're not bracing yourself into the car with your knees!
Another approach is to only install the lap belt portion of a racing harness. I've autocrossed another guy's Miata with a good wide lap belt under the stock 3 point, and I found it made a big difference in holding me into the drivers seat. He simply mounted a Crow racing belt to the two rear bolts that hold the seat into the car! Cheep and easy! And when you roll your Miata, you can simply lie down across the passanger seat, safe and sound!
It's a lot easier to think about the course when you're not bracing yourself into the car with your knees!
#20
Registered User
Join Date: Aug 2002
Location: Denver, CO, USA
Posts: 2,045
Likes: 0
Received 0 Likes
on
0 Posts
In addition to a rollbar/cage when considering a 4, 5, or 6 point harness, you also have to think about the height at which you attach the shoulder belts. The rule of thumb is that the belt should be no more than 45 degrees from horizontal. Otherwise, in a frontal impact (even a slight one, or under hard braking), the force of your body going forward will cause the belts to pull down on your shoulders hard enough to cause back injuries, or even snap a collarbone.
But once you get all of the safety considerations taken care of, having a 5/6 point belt really makes a difference in how the car "communicates" with you. And once you have the belts on on course, you'll realize how much effort you put into simply bracing yourself, and how much smoother you can drive with them.
---jps
But once you get all of the safety considerations taken care of, having a 5/6 point belt really makes a difference in how the car "communicates" with you. And once you have the belts on on course, you'll realize how much effort you put into simply bracing yourself, and how much smoother you can drive with them.
---jps
Thread
Thread Starter
Forum
Replies
Last Post
05rx8mazda
RX-8 Parts For Sale/Wanted
18
11-28-2015 09:42 AM
garethleeds
Europe For Sale/Wanted
6
11-19-2015 06:32 AM
Tsurugi
New Member Forum
0
09-07-2015 08:27 PM