mlee76
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Cruise Control
Any suggestions as to what cruise control to fit to a 1990 SW20 turbo?
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darius
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Re: Cruise Control
2013/12/02 13:06:01
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not sure if i was factory stock, but my first MR2, ADM 91NA has cruise control fitted.
Reading Wiki it does mention that Japan stop using them on one of the updates. As i guess i'd say it does exists
Some one want to clarify?
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dennis the menace
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Re: Cruise Control
2013/12/02 19:02:51
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Yep, one of our 1990 SW's has factory cruise control.
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mlee76
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Re: Cruise Control
2013/12/03 00:09:28
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So where might I acquire one? Do you have any idea how it sensed speed?
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dennis the menace
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Re: Cruise Control
2013/12/03 01:26:27
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There is a speed controller / speed ecu up under the dash on the passenger side. Reads from the speedo, sends signal to the actuator in the engine bay.
Currently waiting on word from the insurance assessor on the fate of this SW . . .
Past-President, MR2 Owners Club Qld "There is a fine line between hobby and obsession."
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Reddtarga
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Re: Cruise Control
2013/12/03 10:10:54
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My '90 model ADM has cruise, as well as other ADM cars I know of.
I would think there would be a long list of stuff needed to retrofit it.
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mlee76
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Re: Cruise Control
2013/12/03 12:58:30
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Yes I think I would have to have a close look at my imported sw20 and see if it has the necessary gear to fit a second hand factory cruise control. I am dubious about the speed control as my sw20 speedo is cable driven. I was wondering about the after market units that use magnets on he drive shaft for speed sensing and a vacuum unit to pull the throttle. However I am unsure how the vacuum would work if their is positive pressure at time in the manifold.
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dennis the menace
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Re: Cruise Control
2013/12/03 15:00:42
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Our SW's are both cable driven, the cruise control computer gets a signal from the gauge panel itself, not the speedo cable.
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mlee76
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Re: Cruise Control
2013/12/04 00:27:20
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So what and how is the throttle pulled on the factory set up?
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Reddtarga
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Re: Cruise Control
2013/12/04 09:18:25
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mlee76
So what and how is the throttle pulled on the factory set up?
By an actuator located rear driver's side of the engine bay, and is cable interlinked to the throttle cable. Parts location in the pic shows you just how much 'stuff ' you would need to make it work. The top diagram shows for LHD cars. RHD is reversed. The bottom diagram is the same for both. 
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mlee76
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Re: Cruise Control
2013/12/05 16:10:07
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Seems like it would be easier to install one of those after market units. There should be vacuume to drive the throttle unit found at the brake booster unit although it is at the wrong end of the car. I'll have to investigate.
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Reddtarga
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Re: Cruise Control
2013/12/05 16:29:48
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The booster vacuum comes from the intake manifold.
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mlee76
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Re: Cruise Control
2013/12/05 17:33:04
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Yes normally I would understand this but when the turbo is boosting wouldn't there be posaitve pressure at that point?
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Reddtarga
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Re: Cruise Control
2013/12/05 19:46:31
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Yes, the intake manifold vacuum goes up and down depending on engine load, but there is a one way vacuum check valve that always retains vacuum in the booster circuit. Without it the brake booster wouldn't work.
Early boosters had the check valve mounted on the booster in the frunk, and later boosters had it back on the intake manifold.
Would be easy to modify the early system with an extra check valve in the engine bay to have a reliable vacuum supply there.
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mlee76
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Re: Cruise Control
2013/12/06 15:33:11
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Sound like a good plan. Thanks for the advice.
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