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Help with building your Speeduino, installing it, getting it to run etc.
By theonewithin
#40699
You can run with just a VR. It's not an issue. The Speedy can't see any difference between a Hall or a conditioned VR signal. Both produce a square waveform.

It will be a couple of issues.

1. Conditioner is dead.

2. Jumpers wrong.

3. VR sensor faulty.

4. Mega faulty.

5. Incorrect setup of Speedy (post your tune and a copy of log while cranking).

6. Wiring issues so signal doesn't get to Speedy

7. Faulty PCB soldering/components etc.
By Bmwe21m50turbo
#40749
Thanks it was all due an incorrect jumper. Rpm works fine. :oops:

So today i decided to setup my ignition system but i got a little confused about the going high and low.

Tunerstudio says the correct setting is usually the opposite of megasquirt and i use a 4 channel ignition trigger like the bosch 211. These modules need the setting inverted again? Or is this only depending by the transistors in the speeduino/megasquirt?

I guess the 4channel ignition controller ignites when no signal and charges the coil when it sees the 5v from speeduino? I had it set like this.

Anyway i had spark and the engine fired but fried the ignition control module when i tried to set the base timing. It got quite hot and now there is no spark anymore.

Speeduino signal looks fine so i think only the module is damaged but i how can i fix this problem. Maybe it’s the dwell timing in my tune?

I use a bosch 90492255 coil with about 3 ms dwell timing if I remember correctly.
User avatar
By PSIG
#40774
Bmwe21m50turbo wrote:
Wed Feb 05, 2020 12:33 am
… i use a 4 channel ignition trigger like the bosch 211. …

I guess the 4channel ignition controller ignites when no signal and charges the coil when it sees the 5v from speeduino?
Correct. The 211 needs a high signal (5V) to turn the internal driver transistors on, allowing power to flow from the coil to ground. Low signal (0V) turns the transistor off, stopping power flow. High signal from the ECM to the 211 in order to dwell the coil, and signal going low in order fire it.

You are also correct that it is the ECM circuit that determines whether the setting is going high or low, and MS inverts their signals, requiring you to invert the settings. MS has some good info for EFI, but setup info is different, and can be very confusing. I would try to avoid MS info for setup. Also, the modules can become very warm, but should not burn if the settings are correct for your coil type and voltage, and the coil driver module is mounted on a good heat sink surface.

David
By Bmwe21m50turbo
#40858
Thanks for your reply, got it running quite ok and no more burning ignition modules. 😅

But now my next problem. I use a 60-2 and bosch vr sensor and this gives me a signal to about 3300 rpm. After that the rpm gauge goes to zero.

I started searching and found quite a few problems with this setup so now I’m wondering if I should remove c24 (0.1uf capaciror i think) on the board as suggested by someone. And I think my Ua4c board layout is different than his v0.4 or are these all the same?

I rather not use my solder skills on the tiny smd components on the board.

I think I’m going to try a few 10k resistors at first in series and paralel as shunt.

Idle tooth data logging looks ok 1 long bar but with higher rpm multiple bars appear.

To be honest this is a bit over my head and I really need a scope to determine the problem but I don’t have one.
By Bmwe21m50turbo
#40927
I soldered a 10k ohm resistor in series on the vr+, seems to rev fine now. Engine runs good with a little fiddling around.

Now it’s time to start tuning, I tried to set my base timing as accurate as possible but it’s hard to see how the marks on my engine with my 60-2 wheel and I think it is still a little off because the engine seems to like quite some advance. So apart from that and that it still runs quite rich it seems to have some power and the turbo spools nice :twisted:

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