Pooh came out - Rear end loose at 80+mph acceleration
12-26-2016, 01:18 AM
#16
Burning Brakes
Before doing anything I would check your alignment. I imagine that a poor alignment combined with the Weissach rear geometry could make the handling tricky, especially upon acceleration.
I would also double check the tire pressures. As nutty as this may sound, also double check your lug nuts on the rear to make sure nothing is loose. A tire shop left one slight loose once and the symptoms were similar.
I would also double check the tire pressures. As nutty as this may sound, also double check your lug nuts on the rear to make sure nothing is loose. A tire shop left one slight loose once and the symptoms were similar.
12-26-2016, 05:08 AM
#18
Rennlist Member
Do a quick check also of torque on front lower control arms.
If these bolts happen to begin to back out and actually be loose due to having been undertorqued, then the handling will be extremely loose and can manifest itself in feeling like the rear end is the cause.
If these bolts happen to begin to back out and actually be loose due to having been undertorqued, then the handling will be extremely loose and can manifest itself in feeling like the rear end is the cause.
12-26-2016, 08:00 AM
#19
Rennlist Member
This can easily happen if an alignment was done and these bolts were eased off to help the suspension settle and then "forgotten". And one more thing, check to see if your steering rack bushings are gone. That can make for interesting handling, too.
12-26-2016, 08:52 AM
#20
Team Owner
One other bit of advice , please change the thread title so it can be found in a search later,
not many people will search for ... well you get the picture
not many people will search for ... well you get the picture
12-26-2016, 09:05 AM
#21
Rennlist Member
Pooh came out
Just curious. What does the announcement of Winnie the Pooh being gay, have to do with your 928?.....and please, don't tell me any bad news about Eeyore....
Just curious. What does the announcement of Winnie the Pooh being gay, have to do with your 928?.....and please, don't tell me any bad news about Eeyore....
12-26-2016, 10:30 AM
#22
Rennlist Member
Rennlist Site Sponsor
You have received a lot of good advice on things to check. I just wanted to add a bit of background to one of the more likely causes of your problem.
The rear uprights are controlled at the bottom by a large pin that runs from front to back, and has the rear shock strut mounted at the rear. The connection includes large washers with one spherical side that fits into a spherical recess.
If the parts are assembled in the wrong order, or if the nuts on the ends of the pins are slightly loose. the uprights can pivot slightly on the other mounting points. The results will be that, when traveling down a straight, smooth road, the rear will step slightly to one side when you accelerate, and step back when you let off the throttle.
The cure is to hold one nut stationary, and torque the other to 103 lb/ft. Then, reverse the wrenches and try torquing the nut on the other end - sometimes the pin is frozen in place.
If that doesn't cure the problem, then start carefully checking all of the other points of potential looseness as suggested - although, it is pretty difficult to inspect the car too much.
The rear uprights are controlled at the bottom by a large pin that runs from front to back, and has the rear shock strut mounted at the rear. The connection includes large washers with one spherical side that fits into a spherical recess.
If the parts are assembled in the wrong order, or if the nuts on the ends of the pins are slightly loose. the uprights can pivot slightly on the other mounting points. The results will be that, when traveling down a straight, smooth road, the rear will step slightly to one side when you accelerate, and step back when you let off the throttle.
The cure is to hold one nut stationary, and torque the other to 103 lb/ft. Then, reverse the wrenches and try torquing the nut on the other end - sometimes the pin is frozen in place.
If that doesn't cure the problem, then start carefully checking all of the other points of potential looseness as suggested - although, it is pretty difficult to inspect the car too much.
01-02-2017, 03:27 AM
#23
Rack and pinion Bushings are shot and my tire pressures were way to low come to find out, will be ordering the solid aluminum ones from 928 motorsport.
01-02-2017, 03:34 AM
#24
You have received a lot of good advice on things to check. I just wanted to add a bit of background to one of the more likely causes of your problem.
The rear uprights are controlled at the bottom by a large pin that runs from front to back, and has the rear shock strut mounted at the rear. The connection includes large washers with one spherical side that fits into a spherical recess.
If the parts are assembled in the wrong order, or if the nuts on the ends of the pins are slightly loose. the uprights can pivot slightly on the other mounting points. The results will be that, when traveling down a straight, smooth road, the rear will step slightly to one side when you accelerate, and step back when you let off the throttle.
The cure is to hold one nut stationary, and torque the other to 103 lb/ft. Then, reverse the wrenches and try torquing the nut on the other end - sometimes the pin is frozen in place.
If that doesn't cure the problem, then start carefully checking all of the other points of potential looseness as suggested - although, it is pretty difficult to inspect the car too much.
The rear uprights are controlled at the bottom by a large pin that runs from front to back, and has the rear shock strut mounted at the rear. The connection includes large washers with one spherical side that fits into a spherical recess.
If the parts are assembled in the wrong order, or if the nuts on the ends of the pins are slightly loose. the uprights can pivot slightly on the other mounting points. The results will be that, when traveling down a straight, smooth road, the rear will step slightly to one side when you accelerate, and step back when you let off the throttle.
The cure is to hold one nut stationary, and torque the other to 103 lb/ft. Then, reverse the wrenches and try torquing the nut on the other end - sometimes the pin is frozen in place.
If that doesn't cure the problem, then start carefully checking all of the other points of potential looseness as suggested - although, it is pretty difficult to inspect the car too much.
01-02-2017, 03:40 AM
#25
Wow you truly must be bored,how does this help me with my driving issue,this is what I mean no time for the BS.S.Do I really have to spell it out for you. GROW UP. TO ALL THAT HELP MANY THANKS.
01-02-2017, 10:17 AM
#26
Rennlist Member
So, since YOU don't get it, I guess I have to spell it out for you.
This is very helpful community, with a many knowledgeable members who take their time to provide expert advice. Do your part to help the next guy by titling your thread thoughtfully. It's not all about you.
Read the the New Visitor Thread.
01-02-2017, 03:11 PM
#28
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