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The mkiv Supra Owners Club

Toyota REAS suspension???


SilverSoop
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Frame numbers over 1000849 (with build date post Sept 1997) should have it fitted, so yours should fit the bill.

 

Heres a little info:

 

REAS (Relative Absorber System) for comfortable ride and high handlings stability.

The REAS features an entirely new mechanism that functions not only to achieve a comfortable ride with a relatively small amount of damping force in cases like when both tires hit a gap in the road, but also functions to stabilize the body of the automobile against lateral "rolling" motion by adding a suitable amount of extra damping force and absorb the force acting in the lateral roll direction, as when cornering, when the pattern of depressions and protrusions in the road surface are different on the left and right wheel sides or when subjected to cross winds. Three main points of the REAS structure are as follows

1. The left and right shock absorbers have separate oil chambers with a REAS valve positioned on the connection flow passage.

2A single gas chamber is shared by the left and right.

3. Using the separate actions of hydraulic fluid and gas, a separating piston is activated by the coupled movements from the right and left.

 

Regards,

 

Gaz.

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Does it noticably improve the Supra's ride/handling?

 

What is does really is improve the ride comfort whilst retaining good flat cornering........

 

The shocks and springs can be softer than usual as the setup assists the loaded side in corners. eg on a REAS equipped TT, it gives uk ride comfort with say jap spec in corner stiffness/low roll.......

 

I remove my front setup as one shock was weeping...... i couldn't find any real info on the system as regards repairing/removal so decided to replace temporarily with some bilsteins and repair refit............i have stuck with the bilsteins so far as its performing well.

 

I personally didn't see an adjustment, there certainly wasn't a height adjustment on mine.

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What is does really is improve the ride comfort whilst retaining good flat cornering........

 

The shocks and springs can be softer than usual as the setup assists the loaded side in corners. eg on a REAS equipped TT, it gives uk ride comfort with say jap spec in corner stiffness/low roll.......

 

I remove my front setup as one shock was weeping...... i couldn't find any real info on the system as regards repairing/removal so decided to replace temporarily with some bilsteins and repair refit............i have stuck with the bilsteins so far as its performing well.

 

I personally didn't see an adjustment, there certainly wasn't a height adjustment on mine.

 

Oh right, i was told that there was...i couldnt find anything either.

My supe must have been lowered by different springs then,

as its quite low at the front :D

I just thought it may have been the reas suspension which was / is adjustable...:rolleyes:

 

Thanks for all your help...:D ;)

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mmm... mine 1999 and although I didn't buy it standard i could not see any fittings for it.

 

If you look at wipekedia they mention yaw control;

"The Supra was also lighter than the Mitsubishi 3000GT VR4 and the Nissan 300ZX Turbo. Despite its curb weight, in 1994 the MKIV managed a remarkable skidpad rating of 0.98 lateral g's [1] due in part to a four-sensor four-channel track tuned ABS system with yaw control whereby each caliper is sensored and the brakes are controlled individually according to the speed, angle, and pitch of the approaching corner."

 

http://en.wikipedia.org/wiki/Toyota_Supra

 

All I know is that CW waved his magic wand at mine, fuelled by my chequebook, and all the handling gremlins vanished :)

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The spring rates on REAS cars are near as damn it the same as none REAS models, and you cannot change the ride height. I personally can't feel and difference in how well a REAS car handles, but on broken surfaces the low speed ride is better than a "normal" J-Spec suspension. They are VERY expensive when they go wrong, and they are prone to fluid leaks from the damper seals. You can replace the units with normal dampers, and use the existing springs. You need to modify the top mounts though. I can do this if anyone needs it.

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You need to modify the top mounts though.

 

 

why's that Chris? I'm trying to remember if i used the Bilstein top mounts or the REAS ones, when i put on the replacement Bilsteins and old REAS springs.......i didn't notice a difference but then i wasn't looking or expecting there to be one?

 

........i remember changing the bump stops as these were a good bit longer on the REAS shocks......

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The spring rates on REAS cars are near as damn it the same as none REAS models, and you cannot change the ride height. I personally can't feel and difference in how well a REAS car handles, but on broken surfaces the low speed ride is better than a "normal" J-Spec suspension. They are VERY expensive when they go wrong, and they are prone to fluid leaks from the damper seals. You can replace the units with normal dampers, and use the existing springs. You need to modify the top mounts though. I can do this if anyone needs it.

 

Oh ok chris...how much do you charge??

Just incase something goes wrong lol! :D

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  • 3 weeks later...
Guest kaspa_lee

Hi guys, on this forums from Australia, I've got REAS suspension fitted as well and I'm looking to replace it with a full set of toyota bilsteins and I'm wondering if anybody knows if I can replace just the shocks and use the REAS fitted top mounts and other gear? Not looking to do this myself as I'm not mechanically minded enough to do so, just want to know what I need to purchase before handing it over to a suspension specialist.

 

Furthermore, what exactly is the problem with replacing the REAS fitted suspension with coilovers, so many jap sites I've gone through specify that the coilovers are not to be fitted on REAS vehicles...

 

The information on this is really limited out there so any answers are much appreciated!

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mmm... mine 1999 and although I didn't buy it standard i could not see any fittings for it.

 

If you look at wipekedia they mention yaw control;

"The Supra was also lighter than the Mitsubishi 3000GT VR4 and the Nissan 300ZX Turbo. Despite its curb weight, in 1994 the MKIV managed a remarkable skidpad rating of 0.98 lateral g's [1] due in part to a four-sensor four-channel track tuned ABS system with yaw control whereby each caliper is sensored and the brakes are controlled individually according to the speed, angle, and pitch of the approaching corner."

 

http://en.wikipedia.org/wiki/Toyota_Supra

 

All I know is that CW waved his magic wand at mine, fuelled by my chequebook, and all the handling gremlins vanished :)

 

 

REAS was only available factory fitted as standard on the last generation RZ and SZ-R models; it wasn't even an option on other models.

 

The REAS system was actually developed by Yamaha (see old news article here) but has since been evolved by Toyota ('X-REAS').

 

The "yaw control" quoted is not, I believe, a reference to the REAS system but to the "Sports ABS" system that included a G-sensor: standard on the last generation RZ model only but a factory option on all other models (and possibly goes hand-in-hand with bigger brake/wheel combination factory option).

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