efi For The Megasquirt EFI crowd:

[finkbuilt]

Before anybody takes my bad advice and tries to use a VDO idle valve:

http://www.finkbuilt.com/blog/fuel-injection-conversion-complete/

The E30 type VDO idle valve does not really work very well with the PWM Idle circuit modification as outlined in the MSIII manual. The circuit was designed to drive a Bosch or Ford type idle valve. I will be switching to a Bosch valve soon myself.

[winstontj]

Before anybody takes my bad advice and tries to use a VDO idle valve:

http://www.finkbuilt.com/blog/fuel-injection-conversion-complete/

The E30 type VDO idle valve does not really work very well with the PWM Idle circuit modification as outlined in the MSIII manual. The circuit was designed to drive a Bosch or Ford type idle valve. I will be switching to a Bosch valve soon myself.

LOL.... Thanks! I have two that will be going on ebay soon then!

It's also a little awkward to fit down in there right?

EDIT: errr... on second thought. Why does it not work well? Air flow? compatability?

[finkbuilt]

EDIT: errr... on second thought. Why does it not work well? Air flow? compatability?

I'm not exactly sure why, But what is happening with mine (and I have tried 3 different valves), is that it sort of acts lke an on/off valve instead of following a gradual closing curve. It might have to do with the pulse frequency.

It will be open until PWM dutycycle drops below about 70%, then it will close down.

You *can* run the VDO valve and have it act like an on/off solenoid, but you'd be alot happier with a Bosch I think. (my spares VDO's are going on ebay as well)

steve

[winstontj]

EDIT: errr... on second thought. Why does it not work well? Air flow? compatability?

I'm not exactly sure why, But what is happening with mine (and I have tried 3 different valves), is that it sort of acts lke an on/off valve instead of following a gradual closing curve. It might have to do with the pulse frequency.

It will be open until PWM dutycycle drops below about 70%, then it will close down.

You *can* run the VDO valve and have it act like an on/off solenoid, but you'd be alot happier with a Bosch I think. (my spares VDO's are going on ebay as well)

steve

Hope I get mine up before you do or else mine will be worth half!

I plugged it into an E30 (the VDO one) and it worked as it should - gradual. I see how the "on/off" would be a problem - a big one. Personally I like the E21 aux. air valve because of it's simplicity but it's so darn ugly and messy. I want to have something neat, clean and out of sight.

Which bosch are you going to go with? Also is there a resistor that could be added to the wiring to lessen the on/off effect? I didn't think of it at the time but what about measuring the E30 system and matching MS to that? Is it just that the VDO is litterally more solonoid like rather than heat/bi-metallic spring like (the former being the on/off and the latter being the gradual)?

Thanks for posting this - you've saved me some trouble down the line because after seeing your post I really was planning on using the VDO.

Best,

TJW

[finkbuilt]

Thanks for posting this - you've saved me some trouble down the line because after seeing your post I really was planning on using the VDO.

Best,

TJW

Yeah, I did try a couple of differnet resistors 8ohm and 20ohm, and a few different flyback diodes as well, but nothing really helped.

I am going with a Bosch valve that came from a mecedes, but supposedly that "family" of Bosch rotary-type valves all take the same input, and are known to work.

steve