Air Lift Rear Air Bag - Toyota Sienna Forum - siennachat.com
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post #1 of 54 (permalink) Old 08-11-2015, 07:33 AM Thread Starter
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Air Lift Rear Air Bag

Got tired of driving around with amount of rear squat and lights blinding everyone when fully loaded. The rear squat really made the handling feel very unstable.

Installed adjustable rear airbags to level out the van. Set it at about 36 psi which leveled it out pretty well (3 kids in the 2nd row, 3rd row folded down packed with camping gear... and 5 bikes). Took it on a trip to the Catskills last week and what a HUGE difference! You almost feel like you aren't carrying any load. Sway is minimized, Steering feels predictable and stable. The only indication that you have that you are carrying the weight is when you slow down... The under powered brakes in our Siennas quickly remind you that you are carrying weight!

I installed the schader valve in the jack/tool kit area and set to 5 psi with no load.

Purchased the kit here if anyone is interested...
http://www.amazon.com/gp/product/B00...ilpage_o00_s00
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2015 Toyota Sienna SE Premium Package / Predawn Gray Mica
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post #2 of 54 (permalink) Old 08-12-2015, 06:35 AM
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Re: Air Lift Rear Air Bag

Quote:
Originally Posted by JaySpec7 View Post
Got tired of driving around with amount of rear squat and lights blinding everyone when fully loaded. The rear squat really made the handling feel very unstable.

Installed adjustable rear airbags to level out the van. Set it at about 36 psi which leveled it out pretty well (3 kids in the 2nd row, 3rd row folded down packed with camping gear... and 5 bikes). Took it on a trip to the Catskills last week and what a HUGE difference! You almost feel like you aren't carrying any load. Sway is minimized, Steering feels predictable and stable. The only indication that you have that you are carrying the weight is when you slow down... The under powered brakes in our Siennas quickly remind you that you are carrying weight!

I installed the schader valve in the jack/tool kit area and set to 5 psi with no load.

Purchased the kit here if anyone is interested...
http://www.amazon.com/gp/product/B00...ilpage_o00_s00

I bought used lease return 2011 last year, did the same Air Lift install with Schrader in existing fender weld alignment hole (no drilling) and set at 20 PSI. My daughter immediately bought a 2015 and got the Air Lift for Christmas, set theirs at 25 PSI. Air Lift maximum pressure recommendation is 35 PSI, but system volume is small, so use combo fill/gauge or real small compressor. eTrailer has great 15 min install video on youtube with before/after, under side camera views. Be sure to warm plastic tube ends in hot water before connecting to tee fittings.

Air springs work like progressive wound springs, work like shock absorbers, and when linked together act like a pneumatic sway bar. I've own/modified autos for fifty years and this is the best cost/benefit install i've ever done.....HIGHLY RECOMMENDED MOD !
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post #3 of 54 (permalink) Old 08-13-2015, 08:28 PM
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Was thinking of doing this mod. My van has 20x10.5 with 275/40 on stock height and with 7 passengers it rubs on turns and bumps. You think this will help stop the rubbing? How easy was the install?
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post #4 of 54 (permalink) Old 08-17-2015, 07:37 AM Thread Starter
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Re: Air Lift Rear Air Bag

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Originally Posted by Trademark View Post
Was thinking of doing this mod. My van has 20x10.5 with 275/40 on stock height and with 7 passengers it rubs on turns and bumps. You think this will help stop the rubbing? How easy was the install?
This really keeps the rear from sagging, keeping the van level and more stable under weight. I'm not sure, but if you're not rubbing w/o the passengers... then it might.

It's really easy to install...
[video=youtube;EF4UALNJcw0]https://www.youtube.com/watch?v=EF4UALNJcw0[/video]

2015 Toyota Sienna SE Premium Package / Predawn Gray Mica
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post #5 of 54 (permalink) Old 08-19-2015, 08:24 PM
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Re: Air Lift Rear Air Bag

Bought a set over the summer but haven't got to installing it yet. Glad they work. Have you tried towing a trailer with it?
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post #6 of 54 (permalink) Old 08-19-2015, 08:34 PM Thread Starter
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Towed the Jet Boat a couple of times already. Such a big difference with the bags!
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post #7 of 54 (permalink) Old 08-21-2015, 04:40 PM
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Re: Air Lift Rear Air Bag

Quote:
Originally Posted by JaySpec7 View Post
This really keeps the rear from sagging, keeping the van level and more stable under weight. I'm not sure, but if you're not rubbing w/o the passengers... then it might.

It's really easy to install...
[video=youtube;EF4UALNJcw0]https://www.youtube.com/watch?v=EF4UALNJcw0[/video]
Watch the install video several times and remember to slip the spring clip over the hose before making a connection....

and to use CUP OF VERY HOT WATER to make expanding the tube over the fittings easy....

i located my fill valve in existing fender well alignment hole inside passenger jack storage.....

punched (not slit) hole in existing rubber drain plug to get from under van to well....

DO NOT USE HIGH VOLUME/PRESSURE FILL....do not overfill 35 psi max....enjoy !
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post #8 of 54 (permalink) Old 08-28-2015, 01:50 AM
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Quote:
Originally Posted by JaySpec7 View Post
Quote:
Originally Posted by Trademark View Post
Was thinking of doing this mod. My van has 20x10.5 with 275/40 on stock height and with 7 passengers it rubs on turns and bumps. You think this will help stop the rubbing? How easy was the install?
This really keeps the rear from sagging, keeping the van level and more stable under weight. I'm not sure, but if you're not rubbing w/o the passengers... then it might.

It's really easy to install...
[video=youtube;EF4UALNJcw0]https://www.youtube.com/watch?v=EF4UALNJcw0[/video]
Install seems simple enough. Would this help the swaying of the van on turns? I just feel like a giant boat when taking turns sometimes. Thanks for the feedbacks.
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post #9 of 54 (permalink) Old 08-31-2015, 11:19 AM
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Re: Air Lift Rear Air Bag

Yes, body roll is significantly reduced. The typical install has both bags fed by one valve, I installed two separate valves to help improve handing even more. This will prevent air moving from one side to the other during turns, which I think would cause more roll.
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post #10 of 54 (permalink) Old 08-31-2015, 05:36 PM
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Re: Air Lift Rear Air Bag

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Originally Posted by charwood77 View Post
Yes, body roll is significantly reduced. The typical install has both bags fed by one valve, I installed two separate valves to help improve handing even more. This will prevent air moving from one side to the other during turns, which I think would cause more roll.

You guessed wrong....connecting the bags with a TEE fitting and single fill valve acts like a pneumatic sway bar....

as you compress one side, it transfers pressure to the other lowering the lifted wheel....

most coil springs are linear compression, air springs are progressive compression AND dampening....
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post #11 of 54 (permalink) Old 08-31-2015, 06:03 PM
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Re: Air Lift Rear Air Bag

i recall this conversation from another thread, I'm no engineer but to me it seems like as you fill the inside bag you are increasing body roll.
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post #12 of 54 (permalink) Old 08-31-2015, 06:24 PM
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Re: Air Lift Rear Air Bag

Quote:
Originally Posted by SwaggerWagonChatter View Post
connecting the bags with a TEE fitting and single fill valve acts like a pneumatic sway bar....
as you compress one side, it transfers pressure to the other lowering the lifted wheel....
thus the transferred pressure makes the spring/wheel on the side of the vehicle that is highest put even more pressure downward, and raising that side even further. Squeeze one bag, the other gets more pressure.
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post #13 of 54 (permalink) Old 09-01-2015, 10:24 AM
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Re: Air Lift Rear Air Bag

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Originally Posted by lipster View Post
thus the transferred pressure makes the spring/wheel on the side of the vehicle that is highest put even more pressure downward, and raising that side even further. Squeeze one bag, the other gets more pressure.
thus increasing roll...

hence, 2 fill valves.
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post #14 of 54 (permalink) Old 09-01-2015, 11:25 AM
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Re: Air Lift Rear Air Bag

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Originally Posted by charwood77 View Post
thus increasing roll...

hence, 2 fill valves.
Yup, I agree.
I do however, have only one fill valve, and I still love what those pretty red bags do for the vehicle.
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post #15 of 54 (permalink) Old 09-01-2015, 05:19 PM
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Re: Air Lift Rear Air Bag

I have BC coilovers and found a smaller airlift bags 4"x4". The only thing that I have to do is cut the black spacers in half to make it thinner.
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