Cruise Control

Re: Cruise Control (mlee76)

Fri, 06 Dec 2013 15:33:11 GMT

Sound like a good plan. Thanks for the advice.

Re: Cruise Control (Reddtarga)

Thu, 05 Dec 2013 19:46:31 GMT

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.

Re: Cruise Control (mlee76)

Thu, 05 Dec 2013 17:33:04 GMT

Yes normally I would understand this but when the turbo is boosting wouldn't there be posaitve pressure at that point?

Re: Cruise Control (Reddtarga)

Thu, 05 Dec 2013 16:29:48 GMT

The booster vacuum comes from the intake manifold.

Re: Cruise Control (mlee76)

Thu, 05 Dec 2013 16:10:07 GMT

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.

Re: Cruise Control (Reddtarga)

Wed, 04 Dec 2013 09:18:25 GMT

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.

Re: Cruise Control (mlee76)

Wed, 04 Dec 2013 00:27:20 GMT

So what and how is the throttle pulled on the factory set up?

Re: Cruise Control (dennis the menace)

Tue, 03 Dec 2013 15:00:42 GMT

Our SW's are both cable driven, the cruise control computer gets a signal from the gauge panel itself, not the speedo cable.

Re: Cruise Control (mlee76)

Tue, 03 Dec 2013 12:58:30 GMT

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.

Re: Cruise Control (Reddtarga)

Tue, 03 Dec 2013 10:10:54 GMT

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.

Re: Cruise Control (dennis the menace)

Tue, 03 Dec 2013 01:26:27 GMT

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 . . .

Re: Cruise Control (mlee76)

Tue, 03 Dec 2013 00:09:28 GMT

So where might I acquire one? Do you have any idea how it sensed speed?

Re: Cruise Control (dennis the menace)

Mon, 02 Dec 2013 19:02:51 GMT

Yep, one of our 1990 SW's has factory cruise control.

Re: Cruise Control (darius)

Mon, 02 Dec 2013 13:06:01 GMT

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?

Cruise Control (mlee76)

Mon, 02 Dec 2013 12:27:08 GMT

Any suggestions as to what cruise control to fit to a 1990 SW20 turbo?