Anyone running PSS9 on their e39 M5?
Discussion
Regarding the Bilstein B14's I have a few questions, you guys that are running them may chip in.
I took the car to a small M/Alpina gathering a few days ago and on the way home i decided to see how fast it would go, and before I upset anyone with top speed pulls on a public highway I will stress that it was late in the evening and no traffic, Sweden is the size of California but with a population of 10 million, so there is very little traffic at night.
Car pulled happily and sharply in 6th w/o downshift from 80 mph to a speedo indicated 177 mph, 173 on the GPS, so the car is de-limited it would appear.
However, over 130 it felt anything but rock solid in the rear, felt like it wandered a bit, it was a little un-nerving tbh. And above 160 a sharp but light vibration appeared from the right rear. Up until 120 the shocks felt nothing short of brilliant, but above that it was clear that ground frost for 6 months a year makes for bumpy roads and the B14's are just too stiff. I can live with it tho. I don't drive like a hooligan for 99.5% of the time anyway. But the loose-ness and vibrations will be hunted down.
What's your input? Subframe bushes? Something else. The front end felt very stable indeed however.
Edit: I realised that the header was all wrong, should read: Wandering rear end at very high speeds, suggestions?
I took the car to a small M/Alpina gathering a few days ago and on the way home i decided to see how fast it would go, and before I upset anyone with top speed pulls on a public highway I will stress that it was late in the evening and no traffic, Sweden is the size of California but with a population of 10 million, so there is very little traffic at night.
Car pulled happily and sharply in 6th w/o downshift from 80 mph to a speedo indicated 177 mph, 173 on the GPS, so the car is de-limited it would appear.
However, over 130 it felt anything but rock solid in the rear, felt like it wandered a bit, it was a little un-nerving tbh. And above 160 a sharp but light vibration appeared from the right rear. Up until 120 the shocks felt nothing short of brilliant, but above that it was clear that ground frost for 6 months a year makes for bumpy roads and the B14's are just too stiff. I can live with it tho. I don't drive like a hooligan for 99.5% of the time anyway. But the loose-ness and vibrations will be hunted down.
What's your input? Subframe bushes? Something else. The front end felt very stable indeed however.
Edit: I realised that the header was all wrong, should read: Wandering rear end at very high speeds, suggestions?
Edited by PowerslideSWE on Wednesday 30th August 16:23
Edited by PowerslideSWE on Monday 4th September 09:37
Edited by PowerslideSWE on Monday 4th September 09:37
Edited by PowerslideSWE on Monday 4th September 09:38
PowerslideSWE said:
Regarding the Bilstein B14's I have a few questions, you guys that are running them may chip in.
I took the car to a small M/Alpina gathering a few days ago and on the way home i decided to see how fast it would go, and before I upset anyone with top speed pulls on a public highway I will stress that it was late in the evening and no traffic, Sweden is the size of California but with a population of 10 million, so there is no traffic at night.
Car pulled happily and sharply in 6th w/o downshift from 80 mph to a speedo indicated 177 mph, 173 on the GPS, so the car is de-limited it would appear.
However, over 130 it felt anything but rock solid in the rear, felt like it wandered a bit, it was a little un-nerving tbh. And above 160 a sharp but light vibration appeared from the right rear. Up until 120 the shocks felt nothing short of brilliant, but above that it was clear that ground frost for 6 months a year makes for bumpy roads and the B14's are just too stiff. I can live with it anyway. I don't drive like a hooligan for 99.5% of the time anyway. But the loose-ness and vibrations will be hunted down.
What's your input? Subframe bushes? Something else. The front end felt very stable indeed however.
Edit: I realised that the header was all wrong, should read: Wandering rear end at very high speeds, suggestions?
RTABs in my experience. My first E39 M5 used to wander around a bit until I changed the RTABs. It made such an unbelievable difference.I took the car to a small M/Alpina gathering a few days ago and on the way home i decided to see how fast it would go, and before I upset anyone with top speed pulls on a public highway I will stress that it was late in the evening and no traffic, Sweden is the size of California but with a population of 10 million, so there is no traffic at night.
Car pulled happily and sharply in 6th w/o downshift from 80 mph to a speedo indicated 177 mph, 173 on the GPS, so the car is de-limited it would appear.
However, over 130 it felt anything but rock solid in the rear, felt like it wandered a bit, it was a little un-nerving tbh. And above 160 a sharp but light vibration appeared from the right rear. Up until 120 the shocks felt nothing short of brilliant, but above that it was clear that ground frost for 6 months a year makes for bumpy roads and the B14's are just too stiff. I can live with it anyway. I don't drive like a hooligan for 99.5% of the time anyway. But the loose-ness and vibrations will be hunted down.
What's your input? Subframe bushes? Something else. The front end felt very stable indeed however.
Edit: I realised that the header was all wrong, should read: Wandering rear end at very high speeds, suggestions?
Edited by PowerslideSWE on Wednesday 30th August 16:23
PowerslideSWE said:
Thanks a lot.
Would that be the rear trailing arm bushings?
There is a ball joint somewhere in there aswell I was told, and the big subframe ones. Will be a job (for someone else I reckon
) during the winter slumber.
Sorry, I'm getting confused again! It's the ball joint you want to do, admittedly I replaced all the bushes and arms I could in mine (apart from those for the bottom arm to the chassis, which are supposed to be lifetime of the car) and after that it was transformed. I'm pretty confident it was the lower arm ball joint that was the problem though. This one:Would that be the rear trailing arm bushings?
There is a ball joint somewhere in there aswell I was told, and the big subframe ones. Will be a job (for someone else I reckon
) during the winter slumber.
They are a bit of a pain to push out, though once I got the right tool on there it was a breeze.
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