[MR2] 5 point harness
BARRY S DAVIES
bsdavies at q.com
Tue Jan 25 11:07:54 EST 2011
Thanks David, that is the sort of info I was looking for.
Thanks too, to everyone else. I didnt mean this to get into a discussion of safety. If it were that, then obviously the best choice would be either a) full roll cage, Hans device, 5 point harness, window netting, fire extinguisher system, or
b) stay at home and watch TV.
As I said, this is HPDE, and standard OEM 3 point harness system and seats is considered perfectly adequate. I just want to be more physically stable in the car. I am aware it is not without risk. Last session a driver turned his BMW into a BM after doing something the instructors warned him not to.
He walked away fine though.
> Date: Tue, 25 Jan 2011 09:59:35 -0500
> From: hillman at planet-torque.com
> To: bsdavies at q.com
> CC: mr2 at mr2.com
> Subject: RE: [MR2] 5 point harness
> On Mon, 24 Jan 2011, BARRY S DAVIES wrote:
> > unless I missed a couple of posts, I've not seen anyone suggest a stock
> > seat is safer than a 5 point harness. Anyway, it sounds like you have
> > solved the problem I am looking to solve. My thought initially was to
> > use the firewall for the anchor points, but that I would need to
> > reinforce it with a steel bar behind, so as not to pull through it. The
> > problem is, there is a lot of "stuff" running along the engine side of
> > the firewall that pretty much precluded that. Are you saying that in
> > your experience just the metal of the firewall, perhaps with some
> > pretty large washers, is strong enough? I would appreciate any details
> > you could offer of your set up.
> For years I used a 3-point harness ( make and model escape me at the
> moment ) with a single tail-strap bolted to the infamous 'coat-hook' hole
> under the window in my mk2. Now on the mk2 chassis, at least, that area
> gets a bad rap. I cut up my old mk2 parts car with a sawzall, and the top
> edge of the firewall is pretty stout... not surprising since it's a
> structural element of the car. Don't simply stick a bolt through the skin
> of the firewall itself, that's not much more than sheet metal in places.
> Or if you do, a large backing plate is required.
> On my current mk1 iceracer, both shoulder straps are attached to a
> large grade 8 bolt sunk through the drilled-out 'coat-hook' hole and
> secured with a washer on the underside ( much easier since the battery has
> been relocated ). That install has been through about 175 races now, and
> some pretty decent collisions over the past couple weeks. I've never had
> the opportunity to plow it into a concrete wall to test ( well, I did run
> this car at Blackhawk Farms once, but I didn't hit anything ). Would that
> mounting withstand 120mph into a wall? Probably not, but since I don't
> wear a HANS device, that'd be likely to break my neck anyway and I'd
> rather it fail and take my chances ( not mention soaking up some energy in
> the process ). It will withstand 70 mph into a snowbank that stops the
> car in a few feet, because I've done that a few times, and there aren't
> even cracks in the paint around the mounting. The whole chassis
> is, in fact, bent after some recent hits we've taken, but the harness
> mounting looks brand new.
> David Hillman
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