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      07-06-2011, 04:56 PM   #1
gthal
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Jacking two side wheels at once?

To swap out wheels for HPDEs or winter, I have historically used the jacking points and lifted each corner independently to change the wheels one at a time. I don't particularly like the twisting action this does to the frame.

Rather than using the front/rear jack points, could you put the jack on the side of the car, in the center, and jack up the entire side of the car to lift both wheels on that side?

Alternatively, I guess you could jack up the front, put a jack stand under the side and then jack the back.

I know there are jack points in the back (some use the rear diff, others a different point) and similar things in the front but I can't reach them effectively.

Any thoughts? Thanks!!
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      07-06-2011, 05:37 PM   #2
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Never jack under the diff as you break the fins!I use the rear side jacking point to jack up the complete side of the car.Never had an issue doing it that way.You have to jack it up quite a way to get the front off the ground doing it this way.
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      07-06-2011, 05:45 PM   #3
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Quote:
Originally Posted by Gearhead999s View Post
Never jack under the diff as you break the fins!I use the rear side jacking point to jack up the complete side of the car.Never had an issue doing it that way.You have to jack it up quite a way to get the front off the ground doing it this way.
I guess the other option would be two jacks so you could lift the front and rear side jacking points at the same time. Come to think of it, I may actually invest in a second jack. I just hate seeing the car twist when only using one jacking point.
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      07-06-2011, 06:12 PM   #4
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Quote:
Originally Posted by gthal View Post
I guess the other option would be two jacks so you could lift the front and rear side jacking points at the same time. Come to think of it, I may actually invest in a second jack. I just hate seeing the car twist when only using one jacking point.
Heath, I use two floor jacks at the same time. Not sure why I started doing it this way, but it's quick and like you said, keeps the car level for each side.
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      07-06-2011, 06:32 PM   #5
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I would never lift the car from the side to lift both wheels; even lifting just one produces unpleasant creaking. For that reason, when I remove a wheel that way, I quickly lower the car to a level stance until I'm ready to reinstall the wheel. And no, no middle side jacking point; only the ones next to each wheel.

Just lift the front and the back independently. I'd never put my car in 4 jack stands for safety reasons, but some folks do it. The most I do is one end on ramps (and wheels choked) and the other on jack stands.

Oh, and I always use the differential to lift the rear and zero issues, but the trick is to place the basket right at the middle, below the brace, not the fins. And I always put the car in either ramps or jack stands right away.
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      07-06-2011, 07:29 PM   #6
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      07-07-2011, 02:09 AM   #7
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Donn't worry about any structural stress for corner jacking. You are very far from the yield strength of any part of the unibody. The engineers need to account for this along with hundreds or more subtle load conditions.
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      07-07-2011, 10:43 AM   #8
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I have started doing front and rear. Like was said above not on the diff fins but just ahead of that will be fine. For the front, drive up on some 2x10s to get access to the front central jacking point and lift from there.
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      07-07-2011, 12:07 PM   #9
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Quote:
Originally Posted by swamp2 View Post
Donn't worry about any structural stress for corner jacking. You are very far from the yield strength of any part of the unibody. The engineers need to account for this along with hundreds or more subtle load conditions.
True - whenever you drive at an angle down a driveway ramp you are effectively doing the same thing.
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      07-13-2011, 01:11 AM   #10
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Heath, I kind of chuckled a bit when you asked this question and in the same sentence said it was for a HPDE event. There is no issue in using one jack to lift both wheels off of the car on one side, there is no where close to the forces put on the unibody from jacking that there would be from the driving you will be doing at Shubie on the HPDE. If the frame of your M3 was so delicate that it suffered damage from jacking one corner you would have more serious problems!!!!

Heath, in the future just put your jack under the front lifting point on the rocker panel and jack the car until both wheels on that side of the car are off of the ground, it works really well.

*Never, Ever put the jack in the center of the car body or rocker panel since you will kink the panel, damage the paint/sealant, or both. Please only use the jack points to lift the car!!!!
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      07-15-2011, 06:51 PM   #11
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Quote:
Originally Posted by GregW / Oregon View Post
True - whenever you drive at an angle down a driveway ramp you are effectively doing the same thing.
Indeed, but that doesn't mean the car likes it . Car is definitely not going to break in half, but that's how cars 'age' over time, developing creaks/rattles/moans/etc; you're expediting the process every time you hear it creak. It'd avoid twisting a car like that, but to each his own. Have a great weekend ahead gang.

Last edited by elp_jc; 07-16-2011 at 12:56 AM.
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      07-15-2011, 11:34 PM   #12
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Can you use front (or rear) jack point and lift one whole side, put 2 jack stands under, then jack up the other side the same way to end all-up on 4 jack stands? I am going to put new brake pads on and also do a brake fluid flush at the same time. I hear you need to flush all four calipers in a reasonably quick sequence to avoid mixing of old/new fluid. Doing 1 corner at a time would be too slow. Yes? No?
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      07-15-2011, 11:53 PM   #13
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Quote:
Originally Posted by elp_jc View Post
Indeed, but that doesn't mean the car likes it . Car is definitely not going to break in half, but that's how cars 'age' over time, developing creaks/rattles/moans/etc; you're expediting the process every time you hear it creak. It'd avoid twisting a car like that, but to each his own. I'd avoid it if possible. Have a great weekend ahead gang.
Mine doesn't "creak" - which would be the suspension if anything anyway, not the unibody.

More nonsense from the worry-wart.

Last edited by Singletrack; 07-16-2011 at 12:02 AM.
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