idle up valves.. resistance/flow?

[oldcorollas]

thinking to set up an "electrical idle up" type of thing using 3 or 4 idle up valves, the likes of which are used for aircon etc

does anyone have some lying around they could measure the resistance of?

any ideas on flow? i spose enough to up engine speed a few hundred rpm.. are they significantly different flow for different size motors (ie, for 4AFE vs 1UZ)??/

[AdrianS]

Judging on hose sizes (4age blacktop), the power steering idle up has more air flow than the aircon, if that helps.
You could always put a restrictor in the line if the flow is too high.

[oldcorollas]

thanks for the suggestion!
are they an ON/OFF type valve? trying to avoid having anything more complicated than a rotary switch...

[AdrianS]

on-off usually. 2 different size valves gives you 4 settings :
both closed
small open, big closed
big open, small closed
both open

[SumKid]

There are stepper motor ones too, mitsubishi's have a lot of different types which I think are interchangable between lots of makes.

[AdrianS]

The advantage of the simple VSV's is that you can control them with an on-off switch.
The blacktop has one for a/c idle up, one for p/s idle up (bigger plumbing), and one or two more for ??? (I didn't trace them all).
My aw11 mr2 has another two for the cruise control : vac in & vac bleed to move the actuator.
Any late 80's or 90's corolla should provide you heaps to play with - the p/s one is mounted on the column, if I recall.
Stepper motors are more common as cars get newer, as they offer finer control of idle, but then you need electronics to drive them.

[MWP]

Use a ISCV off a I6 Falcon.
They are PWM controlled, so can also be used just plain on/off.
You would need to limit air flow manually some how though, as at full on, they can flow enough to rev the engine >5000RPM (on my 3SGTE anyway).

[AdrianS]

You could build a simple PWM from a 555 timer and power transistor, should be enough to drive an ISCV. Control it with a potentiometer - maybe $10 worth of parts total.
I would look for an ISCV off something smaller than a 4 litre falcon, though.

[oldcorollas]

i can have PWM control from megasquirt, and i already have a ford ISCV, along with a few other 4 pole ISCV's

what i want... is to have stepped idle control using 3 or 4 idle up valves, and want to know the typical resistance of the solenoids since i don't have any handy, and can't get to a wrecker during open hours atm.

[thechuckster]

Camira idle-up valve - simple 12V solenoid (good luck on finding one tho).

[AdrianS]

I'll try and measure one or two tonight.
edit Sorry - it's too f'ing cold to stuff around in the workshop tonight. I'll check on the weekend.

[wilbo666]

what i want... is to have stepped idle control using 3 or 4 idle up valves, and want to know the typical resistance of the solenoids since i don't have any handy, and can't get to a wrecker during open hours atm.

Have you said why yet?


If it helps the VSVs on the 2JZGTE seq turbo system are ~24ohms for the large ones and ~41ohms for the small ones.

http://www.toymods.org.au/forums/showthread.php?t=47226


Cheers
Wilbo

[oldcorollas]

Have you said why yet?


If it helps the VSVs on the 2JZGTE seq turbo system are ~24ohms for the large ones and ~41ohms for the small ones.

http://www.toymods.org.au/forums/showthread.php?t=47226


Cheers
Wilbo

oh, becasue the typical large idle up valve is no good for a cammed 1.3L motor... and i want to be able to adjust idle speed with relatively fine steps for the morning drive in winter (sometimes neg temps), and summer (stupid hot temps)...
I wan tto use a rotary switch to just turn up the idle speed basically.

previously it had mechanical activation of the dead ISCV, and also an air bleed valve (noisy)...

so i wanna try this instead.

so around 1/4 to 1/2 an amp each to run? = need rotary switch good for a couple of amps, or a couple of solid state relays?

[DrNick]

I think I might have one in a crate full of 5s celica engine bits, will try and remember to have a hunt for it

[MWP]

Oh... a rotary switch from Jaycar would handle the current no problems.

Get this one:
http://www.jaycar.com.au/productView...T&SUBCATID=410

Then parallel up the poles, so it then has 450mA switching ability.
That should be plenty. Even if the solenoids do pull more than 450mA, the switch will still last quite a long time.