Electronic High Idle Retrofit

[sbman]

Ya I've used a funnel to pedal setup before. While I appreciate the inpu I want a permanent professional solution not a half assed bandaid.

Why not get the Toyota OEM hand throttle? It's clean, factory looking, not too expensive, I'm sure there's a vendor here that will sell you one, or you can dig up the part number and order it your self from somewhere. Thinking about it made me realize I need one too. Not sure why but because 'LandCruiser', so I ordered one off ebay as an impulse buy. I'm thinking I should stop participating in this forum, it gets expensive.

 

[sbman]

Like this one: Hand Throttle Cable Kit 80 Series [78410-60090] - $49.96 : CruiserParts.net, Toyota Landcruiser Parts

 

[landcrshr]

Of course the hand throttle is the permanent professional solution, but if you want an electronics project, how about converting the CC ECU from a speed controller into an RPM controller? Like maybe substituting the TACH signal for the SPEED signal (you may have to condition it ). Make it so it switches function only when shifted to PARK, so you don't lose the CC. And of course there are other inputs to the CC ECU you'd have to manipulate....

I thought about experimenting with this, but then I looked at my spare bike parts and came up with this "Shimano mod" idea instead:

 

[sbman]

Of course the hand throttle is the permanent professional solution, but if you want an electronics project, how about converting the CC ECU from a speed controller into an RPM controller? Like maybe substituting the TACH signal for the SPEED signal (you may have to condition it ). Make it so it switches function only when shifted to PARK, so you don't lose the CC. And of course there are other inputs to the CC ECU you'd have to manipulate....

I thought about experimenting with this, but then I looked at my spare bike parts and came up with this "Shimano mod" idea instead:
View attachment 1416508

The hand throttle could be converted to electronic probably easier than the cruise control servo. A high torque hobby servo and a custom bracket to attach the throttle cable and an off the shelf servo controller project board from sparkfun.

 

[superjuice]

Of course the hand throttle is the permanent professional solution, but if you want an electronics project, how about converting the CC ECU from a speed controller into an RPM controller? Like maybe substituting the TACH signal for the SPEED signal (you may have to condition it ). Make it so it switches function only when shifted to PARK, so you don't lose the CC. And of course there are other inputs to the CC ECU you'd have to manipulate....

I thought about experimenting with this, but then I looked at my spare bike parts and came up with this "Shimano mod" idea instead:
View attachment 1416508

I don't think that SMC fitting is supposed to be used like that

 

[mod5csi]

I have been imagining a switched relay with resistor or potentiometer to interrupt the Engine Coolant Temperature Sensor.

This would force the ECU to richen the idle mix like it would on a normal cold start/idle. With no CEL. The problem is it would run rich, burning more gas. And rich idle could allow unburned fuel to act as a solvent on the cylinder walls, affecting oil life and cylinder lubrication.

Using the throttle body plate to increase idle speed and let the ECU decide the fuel mix would be the best solution.

I am still using the hand throttle.

 

[landcrshr]

I don't think that SMC fitting is supposed to used like that

Lol, good catch!

That portion for the cable had broken off the shifter perch so I improvised.

 

[SmokingRocks]

thanks for all of the input guys, I would do the hand throttle but I would need to buy the 95-97 accelerator pedal as well since it has the tab on it for the hand throttle cable. So then it quickly turns into 100 bucks.

Plus now that I've learned so much about electronics I feel like I can handle anything! And I like to do things differently, thats why I have a land cruiser.

I'm going to test the AC idle bump theory first, I'll report back in a bit.

 

[SmokingRocks]

So the AC idle bump takes it from 650rpm to 900rpm. That may just be enough.

I'm going to tie the switch signal to my ARB air compressor to the AC idle bump. That way when the ARB is on its in high idle.

 

[landcrshr]

I'm going to tie the switch signal to my ARB air compressor to the AC idle bump. That way when the ARB is on its in high idle.

Good idea.
It would be interesting to know if there would be a measurable difference in CFM.

 

[SmokingRocks]

There may be a little bit.

I'm doing this mainly to get the alternator off idle. When I air up with it and the rig is at idle the pump bogs down, if I crack open the throttle you can hear the pump pick up again.

 

[superjuice]

You could trick the ECU into thinking the engines cold too, I think that is higher rpm than the ac.

 

[sbman]

The alternator output will increase quite a bit at 1000 RPM, but is even better around 1500. The higher voltage also is better for the compressor.

 

[SmokingRocks]

 

[SmokingRocks]

Thanks guys for the help, I'll see if this does everything I need it to do.

 

[asutherland]

Does anyone know if it is possible to temporarily input a modified signal to the IAC valve to initiate high idle?

I'm thinking this might be pretty easy on my OBD1 1fz-fe.

@SmokingRocks , does the OBD1 1fz-fe have a VSV (vacuum sensing valve) to control idle up for AC?

If there is, just tie into the 12v line going to the VSV and add your 12v to the line. Make sure to put 2 diodes in place though so the 2 systems don't interfere with eachother.

 

[Stevesnj]

How about this ... $106 Demon 1950 Street Demon Idle Kick-Up Solenoid - Holley Performance Products

Without the bracket $86
https://www.holley.com/products/fuel_systems/carburetor_components/brackets_and_linkage/parts/46-74

 

[Stevesnj]

Cheaper alternative

GUARDIAN ELECTRIC TP12X19-C-24D SOLENOID, CYLINDRICAL, PUSH, CONTINUOUS: Electronic Component Solenoids: Amazon.com: Industrial & Scientific

 

[joedm]

@SmokingRocks so you never detailed what you actually did to get the idle working?

which wire are you feeding the 12v signal to get the ECU to raise the idle?

 

[SmokingRocks]

I tied my air compressor switch into the AC ON signal wire to the ECU (AC has long since been removed). Let me see if I can dig up the wiring diagram