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Originally Posted by Ricky Bobby
Correct! Comfort bags are needed for articulation of suspension - EHC2 models having Sport suspension (3.0 and 4.4 if equipped optionally and all 4.8iS as standard equipment) all require comfort bags -
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Quote:
Originally Posted by X53Jay4.8is
Yes the sport air bags should not be used on the 4.8is rear.
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Originally Posted by TiAgX5
From what I have come to understand, the sport air springs are for sport pkg E53s WITHOUT the height selection option (the 3 button ride height selector in the dash).
ALL other E53s take comfort air springs.
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Quote:
Originally Posted by StephenVA
deleted as I can not find the info to confirm Comfort or Sport airbags as standard on 4.8is
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Quote:
Originally Posted by Ricky Bobby
This - don't go outside the box on this one - you need the Comfort bags from Arnott
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Originally Posted by Dking078
Don't know much, but get COMFORT! The bags provide extra articulation for the adjustable suspension, so sports are no-go.
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Quote:
Originally Posted by wonkabx4.8
Curios to know also
Sent from my iPhone using Tapatalk
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For all those who didn't know or thought otherwise, pardon the late follow up. I received this direct from Robert @ Arnott (I went ahead with the sport bag install into the 4.8is):
I just received the following information from my lead engineer that you requested.
“The Comfort and Sport versions of the air springs have the exact same sleeves and travel range (stroke). The difference lies in the profile or shape of the lower piston. The rolling lobe design of these air springs allows for spring rate changes by altering the profile of the lower piston. Thus the sport models have a larger, more aggressive shaped piston to increase the spring rate of the air spring. While the comfort piston has a slightly lower, less aggressive profile for a more comfortable ride feel. Now, with any BMW, they ride sporty or stiff (my opinion) as it is “The Ultimate Driving Machine” tuned for performance. I can advise that the Sport and Comfort air springs are interchangeable on the E53 X-5 as they mount in the exact same manner. Nothing has to be altered, including ECU, sensors or compressor. As for the height selector beside the steering column, any E53 X-5 with 4WAS will have this height selector switch. If the truck was only equipped with rear air load leveling, it will not.”
This was 3k miles ago. I've since had the X through many ups and down of the suspension, many different loads for the system to auto-adjust to, and plenty of corners to test out the "sport" load- all issue free. There stays a slight and welcomed tightness at the rear.