Semi air suspension

[Jinx57]

Hi all, a question about Semi air suspension on the rear of our motorhome, with a compressor how high will it lift the rear end to get up a steep driveway, as without it, it will bottom out, or any other ideas, thanks

 

[1967bowesj]

Hi all, a question about Semi air suspension on the rear of our motorhome, with a compressor how high will it lift the rear end to get up a steep driveway, as without it, it will bottom out, or any other ideas, thanks

Depends on a few things but if you have enough overhang behind rear wheels that you already ground out it should help. But it depends on vehicle type also, some transits havent seen much lift when fitted. Also the design of the actual bag will determin the amout of lift.
Type of van for starters would help.

 

[BouncyBoatFolk]

Hi all, a question about Semi air suspension on the rear of our motorhome, with a compressor how high will it lift the rear end to get up a steep driveway, as without it, it will bottom out, or any other ideas, thanks

Our coachbuilt, but slightly longer [6.90mt] gives us about 70mm lift under the back end. Your's being slightly shorter [6.4Mt] will probably still give you in excess of 50mm fully inflated [ 5 Bar, or so]. Better softened off for normal use though[ between 2 - 3 bar].
Mike.

 

[oldiesontour]

Depends where you suspension is without air my 2020 boxer pvc sat almost on the bumpstops air adds a good 80mm at the axle,from this I would assume had it started 60 mm off bumpstops then lift would only be 20mm

 

[Bill-H]

By semi air suspension, are we talking the air bags which replace the bumpstops?
Very much depends (as mentioned above) on how far off the bumpstops your vehicle sits when loaded, plus how much overhang you have behind the rear axle.
How much lift do you need to clear the road?
I might be inclined to put the vehicle on your drive at the point just before it grounds out, measure distance from axle to body, then jack the body up from a jacking point and see how higher it needs to go up to clear. If you could wedge some wood between bumpstop and axle while jacked up thenvremove the jack to see if it gives you a clear run up the drive. You'll then know how much extra lift the bags will need from their normal position - takes the guess work out of it.

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[IRHP]

About 50mm at the rear.

 

[pandas]

From memory our then 7.3m gave us around 60mm. Enough for the issue we always had of grounding particularly getting in and off Italian ferries.