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Oh, I see. Interesting. I have a 2 post lift and a 4 post lift, which both lift straight up so the CG of the car relative to the jack never changes.
But I see how it does via the lever action of the QJ. That's certainly something all QJ owners should know.
Years ago I read about someone having an Elise on a 2 post lift. When he removed the front wheels it was enough weight change that the car did a wheelie and toppled backwards.
Everyone should be aware of that possibility with a rear weight biased car.
I lift my front- heavy golf R up the opposite of this and it works just dandy. Solid as a rock. It's more dependent on the lift points than anything else, the lift point at the front is too close to the front wheel to use any other way.
When I first started using QJ’s I never even thought about the orientation. I just happened to get lucky the first 2 times. Third time I happened to lift as shown in the picture I realized in a terrifying manner the car would easily tip backwards. Figured out what was happening and realized orientation is important.
Quickjack is not unstable depending which way the car is facing. In fact, it does not matter which way you have your car on the lift, as long as the designated outside of the lifts are facing out, and not towards the inside of your car. I confirmed this with them via telephone. As an added safety precaution, you can use standard jack stands under the front and back of the lifts, been using a 7000 for years without issue.
OP, what kind of response are you looking for here? This feels like when someone asks if it is okay to use a patched tire on track. Some say it’s okay, others say it isn’t. In this case, QJ phone support says make sure the designated outside of the lifts are facing outside. QJ is sold at Costco, Home Depot, Pelican, and others. Resellers likely default to the manufacturers’ support. When product is used in expensive applications with possibility of user injury involved, resellers will likely defer to manufacturer support, offering nothing more, noting less. I assume the majority of QJ users are likely lifting vehicles with weight biased towards the front. QJ’s website does not make mention of F/R weight differences, and doesn’t make recommendations regarding which way the vehicle should face. QJ only deals with total vehicle weight and measurements involving the lift points when helping customers choose their lift. On purpose, they don’t have a table of cars with a corresponding QJ model.
On the QJ website, there are pictures of multiple vehicles lifted on QJs, including 911s, that match the Pelican advertisement. There are also photos in the “Uses” section, of an SQ5 and a WRX, where it looks like the cars are 180 from the Pelican advert (and opposite of all the cars on the QJ homepage)…
So like the patched-tire-on-track example, do what you’re comfortable with. Ultimately it’s your car on the lift, maybe with you underneath it. The Pelican advert looks like a photoshopped marketing picture; I wouldn’t use that as a recommendation of use.
Since rennlist is a community of folks who deal in physics based facts, it would seem reasonable for us/me to be interested in the facts about which direction the devices should be oriented given our particular vehicles - in this case, the 991 series of 911s.
Let me know if I am not fully understanding your rant ...?
Crude sketch of why orientation matters with the rearward CG of 911’s and the pivoting lifting platform of QJs. You want the CG fully supported. The CG outside the footprint of the base is not good.
Crude sketch of why orientation matters with the rearward CG of 911’s and the pivoting lifting platform of QJs. You want the CG fully supported. The CG outside the footprint of the base is not good.
Sometimes a quick drawing gets the point across. This is the case here. Just install the QJ as recommended with the locks on the outside of each lift.
12-07-2022, 01:28 PM
?? Quick Jack advertisement from Pelican Parts shows incorrect orientation??
The long hood evokes memories of the SLR McLaren 
with 14 inch wheels.
