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Location:
Sydney
Registered:
July 2002
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TEMS technical
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Mon, 17 January 2005 10:47
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Can someone outline EXACTLY what TEMS suspension does. I wanna be able to field some more questions more thoroughly on my suspension.
Currently I know:
It stiffens suspension by a touch of a button
Sounds like a pair of relays in the back (on the strut towers), and the strut towers at the front are larger than "normal".
What exactly happens? Does it change the shock dampening or ... ? I can't picture it.
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Location:
c'town, NSW
Registered:
May 2002
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Re: TEMS technical
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Mon, 17 January 2005 21:11
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a servo motor turns a valve in the shock that lets less or more fluid through as the shock absorber compresses.
i hazard a guess that its actively controlled via a steering sensor and also maybe something that detects body roll.
If i had my MA70 manual here at work i could tell u more.
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Location:
nelson, new zealand
Registered:
October 2004
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Re: TEMS technical
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Mon, 17 January 2005 21:21
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i think its hooked to the brakes as well, if you have it on soft and u lift of the gas and hit the brakes fast it automaticlly switches to hard.
also does it if u lift off the gas and just touch the pedal enough to set off the brake lights
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Location:
Sydney
Registered:
July 2002
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Re: TEMS technical
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Mon, 17 January 2005 22:30
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Yeah it does come on auto if you hit a corner too hard, or if you jam the brakes on.
Where does the fluid come from? Where does it go after its switched back to normal? Does it need to compress to push it back out?
I can switch it to hard mid corner and its pretty instant stiffening, but switching it back to normal it needs a couple of secconds.
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Location:
c'town, NSW
Registered:
May 2002
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Re: TEMS technical
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Mon, 17 January 2005 22:39
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all of the fluid is contained in the shock absorber.
like all shocks, the TEMS shock is just a ram that pushes fluid through a hole all self contained in a tube. the smaller the hole, the harder it is to push fluid through it, the harder the shock is.
the cool thing about the TEMS shock is that it uses a valve to adjust the size of the hole that the ram has to push the fluid through.
so the servo motor turns the valve to allow more fluid (boaty) or less fluid (hard)
check out google for a cut away diagram of a shock absorber, then picture that the channel that the fluid gets forced through during compression is adjustable, and you have your TEMS shock.
dont know if im being clear so HTH.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: TEMS technical
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Mon, 17 January 2005 23:09
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TEMS is controlled by a magic box (the tems computer) mounted in the rear of the ma70s. It takes inputs from the steering sensor (little ring that fits around the steering column), the brake lights, the TEMS controller buttons and a speed input from memory from the ECU (if the speed signal is inputted to the ECU from the back of the speedo).
Essentially depending on the position of the switch on the controller it will default to soft (Normal) or Medium (Sport).
The servos will switch the shocks to hard no matter where the Normal/Sport switch is when one the following is occurring;
Cornering above a certain degree.
Braking when above 60 km/h.
Accelerating quickly.
Braking quickly.
There's a heap of info in the TSRM about them and the diagnostics you can do all of the above is from my bodgy memory since I no longer have my factory workshop manual.
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Registered:
July 2002
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Re: TEMS technical
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Tue, 18 January 2005 00:38
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It's like Tein EDFC, only shitter. If you take a servo off the top of a strut you'll find an adjuster just like most other adjustable shocks. The shocks could then operate standalone as adjustable shocks if you like, albeit with only three settings and unless they've been rebuilt they're probably stuffed anyway.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: TEMS technical
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Tue, 18 January 2005 01:25
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The good thing is the struts are only $73.50 from toyota.  And they are made by KYB.
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Location:
Melbourne
Registered:
May 2002
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Re: TEMS technical
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Tue, 18 January 2005 03:19
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I had a play with my friends supra once whilst we were fitting some TEINs, basically we couldn't install the rears because the spring tops were assembled the wrong way.
Off we went to the testing facility, late night tuning estates 
We had the TEINs in the front, stockers in the rear. Since the rears were only temporary we didn't fit the servo motors, thus with some baby needle nose pliers we wound a half turn more into the rears.
After a few laps and a few more settings, we could get the car to oversteer on the softer settings, and it would totally rail on the harder settings.
There was a definate increase in shock stiffness with only slight adjustments.
dodgydan
oh yeah, they don't click either, so remember where the stock position is
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Location:
Melbourne
Registered:
May 2002
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Re: TEMS technical
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Tue, 18 January 2005 12:49
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| lumpy wrote on Tue, 18 January 2005 10:09 |
TEMS is controlled by a magic box (the tems computer) mounted in the rear of the ma70s. It takes inputs from the steering sensor (little ring that fits around the steering column), the brake lights, the TEMS controller buttons and a speed input from memory from the ECU (if the speed signal is inputted to the ECU from the back of the speedo).
Essentially depending on the position of the switch on the controller it will default to soft (Normal) or Medium (Sport).
The servos will switch the shocks to hard no matter where the Normal/Sport switch is when one the following is occurring;
Cornering above a certain degree.
Braking when above 60 km/h.
Accelerating quickly.
Braking quickly.
There's a heap of info in the TSRM about them and the diagnostics you can do all of the above is from my bodgy memory since I no longer have my factory workshop manual.
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will also switch from water loged raft (normal) to boat (sport) above 120kph and can be obtained for about $55 each (trade) from your nearest toyota dealer
Well worth the $200, maybe even acceptable with revised springs and anti-roll bars (yet to be tested)
Allan
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Location:
tas
Registered:
June 2002
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Re: TEMS technical
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Tue, 18 January 2005 13:03
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$55 each! now i really have no exuse to keep driving around on stuffed shocks.
I had problems getting toyota to order a set of tems in becuase my car was a jap import. Anyone able to hook me up? I'll pay ya for your trouble.
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Location:
Melbourne
Registered:
May 2002
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Re: TEMS technical
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Tue, 18 January 2005 13:22
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i'll send you the part numbers if you pester me enough to go out and have a look
Allan
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Location:
tas
Registered:
June 2002
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Re: TEMS technical
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Tue, 18 January 2005 13:49
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welcome back ole buddy ole pal, haven't seen you on toymods for awhile.
so how bout them part numbers ? 
don't spose you have part numbers for set of stock springs too?  and to really push things new upper and lower bushes for all 4 wheels? 
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Location:
Melbourne
Registered:
May 2002
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Re: TEMS technical
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Tue, 18 January 2005 14:01
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| dingaling wrote on Wed, 19 January 2005 00:49 |
welcome back ole buddy ole pal, haven't seen you on toymods for awhile.
so how bout them part numbers ?
don't spose you have part numbers for set of stock springs too? and to really push things new upper and lower bushes for all 4 wheels?
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Yes better and worse thigs todo in life besides toymods, upper bushes i suggest looking on planetsoarer.com and exploring that path (i think uzz3x and ma70 ones should inter-change) lower ones get some superpro??? poly ones, check your lower bal-joints and just make shure the subframe-body rubbers are in good condition.
as for springs just goto a spring works and get some say 20% stiffer and an inch lower perhaps? you will need to alk to them first ( probably require installed spring length and perferably samples of original springs)
Allan
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