Fuel Injection and Electronic Ignition for VW engines - Speeduino Style

Well well...

Stick a fork in it. Marianne and I ventured up through the clouds to the summit of Haleakala this morning and the barometric corrections kept the car happy from 0 to 10,000 ft. Outside of getting bored and fiddling with it, I think this project is done. I've attached my Speeduino tuning file to this post for the future amusement of people who figure out how to do it better. All cautions apply, don't blow up your engine!

All respect, sir. And thank you very much!

@edsnova posted:

All respect, sir. And thank you very much!

@Michael Pickett-- you sir, are the man.

@Michael Pickett posted:

Stick a fork in it. Marianne and I ventured up through the clouds to the summit of Haleakala this morning and the barometric corrections kept the car happy from 0 to 10,000 ft. Outside of getting bored and fiddling with it, I think this project is done. I've attached my Speeduino tuning file to this post for the future amusement of people who figure out how to do it better. All cautions apply, don't blow up your engine!

As they used to say, "Class dismissed!".

@Stan Galat posted:

@Michael Pickett-- you sir, are the man.

@Stan Galat, whenever you say that, I imagine someone kneeling down and getting tapped on the shoulder with a sword. Probably a Stanistan thing... Anyway, thank you!

And @Michael Pickett coins the phrase of the week thus winning the internet, "It's a Stanistan thing."

@Michael Pickett posted:

@Stan Galat, whenever you say that, I imagine someone kneeling down and getting tapped on the shoulder with a sword. Probably a Stanistan thing... Anyway, thank you!

"beloved by his people, who have no need for elections"

There's no need to be humble, Mike. You are a Hero of the Republic. The Dear Leader has decreed it.

@Stan Galat posted:

"beloved by his people, who have no need for elections"

There's no need to be humble, Mike. You are a Hero of the Republic. The Dear Leader has decreed it.

Reporting for duty, sir!

"@Stan Galat, whenever you say that, I imagine someone kneeling down and getting tapped on the shoulder with a sword. Probably a Stanistan thing"

Actually, it's not a sword.

It's a Type-4 Connecting Rod.......

@Gordon Nichols posted:

"@Stan Galat, whenever you say that, I imagine someone kneeling down and getting tapped on the shoulder with a sword. Probably a Stanistan thing"

Actually, it's not a sword.

It's a Type-4 Connecting Rod.......

I was visualizing almost exactly the same thing, Gordon.

@Michael Pickett

Great thread, just finished reading the whole thing. At one point you mentioned this, but I didn't see any follow-up info on whether it actually happened, or the results if so.:

After doing more research, I'd have been better off configuring using the throttle position sensor (TPS or the Alpha-N algorithm) as the indicator of engine load. This seems to be the recommendation for ITBs anyway so I'll get that reconfigured soon and give it a try.

As I am partway through a similar build based on an MSII controller, this is of great interest to me. I believe MSII also offers a specific blended ITB/ITF mode for our use case scenario, not sure if Speeduino does the same?

Or, did you ultimately find simple MAP based Alpha-N adequate?

Hi James, Alpha-N (MAP) has worked fine for me so far, so I haven't changed it. Speeduino has added a blended load configuration, but I'm not sure if it's as mature as the MSII setup. If I were you, I'd go blended since everyone seems to recommend it for ITBs. I'm mucking around with idle air adjustments and still looking at solutions for picking too large ITB throttle openings. I rarely get over 30% throttle opening during normal driving. Good luck, the MSII is bulletproof!

Ok, so I did just a little more fiddling with the idle air control and thought I'd add it to this thread in case anyone is foolhardy enough to take the same path. Idle air control is the fuel injection equivalent of a carburetor's choke.

It works by leaking extra air and fuel into the intake manifold at certain temperatures and for certain amounts of time after startup. It can also maintain a set idle speed. The particulars are set in setup tables. The mechanics involve a valve that can be controlled by the speeduino (or other ECU) and the setup tables.

I used the same Bosch 3 wire idle air control valve that I had used on my old Porsche turbo. In this case, it was a $28 Isumo equivalent I found on fleabay

https://www.ebay.com/itm/Idle-...&epid=1659374567

The connections are simple. One wire is connected to a fused +12v and the other two wires are selectively grounded by the Speeduino through the Idle 1 and Idle 2 connections. One opens the valve and the other closes it.

I made a small capped manifold out of PVC pipe that connected to 1/4" NPT barbed fittings placed into the intake manifolds. The other end of the valve has a small air cleaner attached.

I'm using PWM Closed + Open Loop as the idle control type. Each system is different, but if you go down this route and have questions let me know. I went this way not only to get a smooth startup, but to keep the air conditioning compressor from dragging the idle down at stops. Works great for both purposes.

Cheers!

Mike

That looks great, Mike. On my to-do list. I bought a Chrysler stepper IAC since I installed the stepper driver to my board. I bought a hunk of aluminum to drill holes into to make a housing, along with a small breather filter like you.

I ran the hoses and plugged the ends for now until it's actually running.

My last Speeduino tuning file update was 7 months ago. Here's what I'm running in July. No major changes, just tweaking the startup and some fueling cells. Again, use as a starting point, don't blow up your engine assuming that your setup and mine are identical.

Cheers!

Thanks Mike. I'm going to spend a couple hours on a chassis dyno soon. I've got it pretty good but a little rich throughout the range.

@DannyP posted:

Thanks Mike. I'm going to spend a couple hours on a chassis dyno soon. I've got it pretty good but a little rich throughout the range.

Great, I'll be interested in the tune that works for you!

Decided to clean up the wiring while installing the Speeduino in the new box under the package tray.

The first thing was to build a new rear relay and fuse box. This powers the ECU, wide band, idle air control, ignition module, fuel injectors, AC fan and compressor clutch and the oil cooler fan. It employs a hidden security switch that allows the driver to disable the whole box effectively forcing a thief to tow to steal.

I splurged and bought a cheap DYMO label printer that could make shrink wrap labels. No more scratching my head as the bomb timer ticks down - was it the red wire or the blue wire?

I also bought a bunch of Deutch waterproof connectors to allow easy removal of the various system components and to make it dead-easy to drop the engine.

My kind of fun and part of my never ending battle against entropy.

Impressive, most impressive.