m20 RHD ITBs idle

[e30davie]

On the megasquirt using a 2 wire is so easy, just 1 output. So i dont see any reason not to have. I used a ford one on my m20b23, but any will work really - just gotta plumb it up.

I put a small modern sanden AC compressor on my m20b23 and it doesnt seem to effect the idle much at all, the old R12 unit certainly did though.

Even the most basic idle strategy will be very beneficial but PID is nice though, but does take a bit of playing around to get it right.

[varg]

There are known cold start issues on regular single throttle body cars without an ICV... I've tuned a few of those over the years. The more aggressive the engine the worse it will generally be, high compression engine with an overlap happy cam for example. If the engine is aggressive enough to warrant ITBs you're going to want an ICV for cold weather driveability, if the car has AC I'd consider the ICV non-negotiable unless you want a high hot idle. Especially if you have a lightweight flywheel.

[digger]

You will want icv on a street car it’s much nicer for cold starts and running A/C. You seem like the kind of person that doesn’t want compromises

[zaq123]

there are a plenty of ITBs that just run on Alpha-N and no ICV....wonder if there were any known cold idle issues with that setup

[Luke758]

In order to properly use an Idle air control valve, you will need to completely close the ITB's and in most cases ITB's are not designed to be closed, as in they remain open just a touch to allow for normal idle airflow. If the RHD ITBs have a fully closed position, then there is no harm in a properly installed ICV setup. If they do not, you can still run them but you will have to balance the airflow between the ITBs and ICV to maintain your desired parameters, and using another method such as an adjustable high idle cable may be simpler. Assuming a properly installed setup, you should not have issues with or without an ICV.

For more info on running ICVs with ITBs, watch this video on my YouTube Channel- https://www.youtube.com/watch?v=xvFZjo5PgG0

[hoveringuy]

You're going to want to have an ICV. The idle air requirements between cold and hot are way different and you'll find it extremely annoying otherwise.

[zaq123]

Alright, should I use ICV or not? I got it all setup for ICV already (vac lines) and MS is pretty simple to set so it runs ICV....my concern is potential vacuum leaks down the road, would like to keep the setup as simple as possible. Anyone in cold climates have any starting issues with ITBs and no ICV? Another alternative is to install some sort of high idle cable but I just want to finish this project already (has been way to long) and at the same time don't want to take any shortcuts