RPM on a digital dash

[Lewis Cobley]

You may need to set the scope so that you can see just one pulse and voltage so you get a full screen. The transient is very fast so may appear a faint trace.

Thanks. I'll take a look at the scope settings.

 

[Lewis Cobley]

Sorry, my point was you can't doc things like that with all this digital stuff!

I'm not trying to clock anything. This is a brand new kit car so the digital dash starts from 0 miles anyway. My problem is the rev counter no longer works.

 

[plugsandsparks]

Like it. I too have a motorsport hobby. Built Megasquirt ECU on a 6 cyl BMW, one with wasted spark one using a single coil. I too had to derive a decent tacho feed for the existing BMW dash. As mentioned high level always refers to a signal off the ignition coils, whereas low level is a clear signal derived from the ECU using the crank sensor. Unless you use the correct one, you wont get a reliable signal. Looks like you are nearly there, cheers P&S

 

[Lewis Cobley]

Well I tapped the dash into a wire running from one of the coils to the ECU and it picks up the RPM fine now! On the scope it was reading around a 4v pulse so I connected this to the low RPM feed.

Like it. I too have a motorsport hobby. Built Megasquirt ECU on a 6 cyl BMW, one with wasted spark one using a single coil. I too had to derive a decent tacho feed for the existing BMW dash. As mentioned high level always refers to a signal off the ignition coils, whereas low level is a clear signal derived from the ECU using the crank sensor. Unless you use the correct one, you wont get a reliable signal. Looks like you are nearly there, cheers P&S

How do you get on with the MegaSquirt? I've seen Mazdas with them on but the Westfield factory recommend Omex instead.

Maybe I should add a MegaSquirt to my E46 330

 

[plugsandsparks]

It was over 5 years ago I built the MS2, I know they have brought more out and its getting cleverer and harder to build yourself. For a N/A simple car like the BMW E30 I have its more than adequate. My main reason for going down the MS2 route was cost. Its dirt cheap and a great way to get into ECU builds and mapping. The great thing about MS2 is there is an awful lot of it about its totally open source with a great backup. The realtime output screen of the engine parameters is really useful and well laid out.

 

[shanky887614]

It was over 5 years ago I built the MS2, I know they have brought more out and its getting cleverer and harder to build yourself. For a N/A simple car like the BMW E30 I have its more than adequate. My main reason for going down the MS2 route was cost. Its dirt cheap and a great way to get into ECU builds and mapping. The great thing about MS2 is there is an awful lot of it about its totally open source with a great backup. The realtime output screen of the engine parameters is really useful and well laid out.

do you have any links? im quite curious i do like watching programs etc on car's and mechanics etc

 

[plugsandsparks]

do you have any links? im quite curious i do like watching programs etc on car's and mechanics etc

Try this: Megasquirt Kits / Assembled Engine Management Systems, Wideband o2 Sensor Systems and tuning products - DIYAutoTune.com


I built MS II from kit, cheap as chips.. lol