X - Reas Suspension
- Thread starter kwhit
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"Standard on the Sport Edition and optional on the Limited is a new diagonal-linked shock system developed by Yamaha, dubbed X-REAS. The system was developed and implemented earlier on Supras and has been updated and redesigned specifically for the 4Runner. X-REAS essentially cross-links front and rear shock reservoirs on opposite sides of the vehicle. A central control absorber contains a free piston that pushes against a low-pressure nitrogen charge. An orifice senses motion across the vehicle and varies dampening to the appropriate shocks.
Think of it this way. As the truck rounds a curve to the left, the rear, driver side shock is relieved while the front, passenger side is increased. This helps to keep the truck more level and in control, instead of diving to the front, passenger side. We got the chance to wail on the 4Runner through some nice country road twisties and we can tell you that they got it right. The new 4Runner handles great."
Think of it this way. As the truck rounds a curve to the left, the rear, driver side shock is relieved while the front, passenger side is increased. This helps to keep the truck more level and in control, instead of diving to the front, passenger side. We got the chance to wail on the 4Runner through some nice country road twisties and we can tell you that they got it right. The new 4Runner handles great."
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Shabetta said:
If he doesn't know whether or not he has it, there is a good chance he might not know how it works either. Plus, the diagrams should help him identify things if he gets under the vehicle.
Are you his official spokesperson? Why respond if you aren't you going to add something positive to the discussion? Nevermind, I don't care to know your answer.
AmbideXtrous
New member
The way to tell is to look for the pumps. They are attached midway between the front and rear tire on the outside of each frame rail on either side. The pumps look like black cylinders about 1-1/2" wide. If you have running boards then it will be hidden behind them. One of R32's pictures shows the placement pretty well.
AmbideXtrous
New member
Here's a pic of one of the pumps.
Shabetta
New member
All he asked was how to know if he has it, why give him an essay??? I did add something positive, i put the thread back on track where it was supposed to be, that ok with you??? Dont be mad because you cant read and wasted your time with information he didnt need.r32 said:
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jeremysoca
New member
I think the diagram r32 included would help in identifying if you have the system or not (hence the picture of the pumps). This forum is around to help educate people which I think r32's post accomplished.
jeremysoca
New member
What other way can it be confirmed? If you want to know if you bot a v6 or v8 youll have to lift the hood. I guess if the window sticker is in the glove box he will be able to tell.
I think its a good idea to get under your truck to familiarize yourself with whats under there ie clearance issues while offroading, wear and tear items.
I really do appreciate it when other forums members take the time to reply to posts (esp mine).
I think its a good idea to get under your truck to familiarize yourself with whats under there ie clearance issues while offroading, wear and tear items.
I really do appreciate it when other forums members take the time to reply to posts (esp mine).
Uneek
Super Moderator
jeremysoca said:
Without getting underneath, if you look at the rear shock, near the top (don't need to have the wheels removed), you will be able to see a brake line like tube coming out of it if it has X-REAS.
On the off-topic, here's some other ways to tell:
For the V6 or V8, late 2003 and newer, from the rear you can look at the tow hitch. V6 you can only see the receiver opening, or 2006+ V6 might not even have one (it's an option on 2006+). V8 the hitch is tubular, and the tube is visible under the rear bumper. From the inside on a V8 4WD, the 4WD dial only has two positions, 4H and 4L; 2H is missing and only present on V6 4WD.
AmbideXtrous
New member
Uneek said:
Why is this the case? You're saying if you have a Limited with the air suspension then you automatically have XREAS. Do you HAVE to have XREAS for the air suspension to work or do they just come packaged together? I thought they were separate systems entirely.
Uneek
Super Moderator
AmbideXtrous said:
Why? I don't know... it'll be something only Toyota and/or its designers can answer. My guess, fewer model variations and Toyota can charge more for the option since it includes all the doo das. Much like how it has to be a Limited to have factory leather.
Yes, having rear air suspension means there's X-REAS. You cannot get the rear air suspension as a stand alone option, it automatically includes X-REAS.
If your question is can X-REAS be removed for a better lift than spacers, probably. AFAIK, X-REAS is a closed system that operates mechanically and there isn't a computer or any electronics that control its operation. The rear air suspension is air bags instead of having the rear coil springs. It's similar to if an Air Ride Technologies system. The springs are replaced by airbags (for ART's system so are any strut assembly).
Yes they are packaged together from the factory, but AFAIK, they are seperate from each other. I don't believe you need rear air suspension for X-REAS to function or vice versa, i.e. independent systems.
AmbideXtrous
New member
Uneek said:
That was more my question. I thought you might be saying that for the air suspension you needed XREAS and that was why they come together. Thanks for the clarification.
I know for a fact you can do better and higher lifts with XREAS taken off. I wanted to keep mine so I went with a spacer lift. But I can already see that the time will come when I want to rip out the XREAS and go with a full coilover replacement setup.
