How do I make my stock BG astina tachometer work after swapping a BP engine? - Page 2

derb · 20-10-2011, 08:50 AM

What Project.R said. My speedo is 10k lower than the actual speed I'm doing, but the tacho is fine, just has the 6000rpm redline on the gauge when really I can go to 7000rpm.

TheMAN · 20-10-2011, 09:08 AM

Quote:

Originally Posted by ElvenMishi

TheMAN,

I don't have any internal mods but my bp is on turbo so I will need the MS ECU.
Is there a way to make the tach compatible? Any work around?

you could use the BP26 GTX ECU also if you're running a turbo

TheMAN · 20-10-2011, 09:10 AM

Quote:

Originally Posted by derb

What Project.R said. My speedo is 10k lower than the actual speed I'm doing, but the tacho is fine, just has the 6000rpm redline on the gauge when really I can go to 7000rpm.

that can be corrected with the correct speedometer gear, if available

otherwise, a cable corrector box can be purchased

ElvenMishi · 21-10-2011, 09:34 PM

It seems like aftermarket is the way to go since a gtx ecu is hard to find in our area.

Speaking of aftermaket, 360 infinite usa heads up display seems like a very interesting option for me.
How would I know that the aftermarket tach and speedo I'm getting is compatible?

project.r.racing · 22-10-2011, 10:15 AM

ask the manufacturer or supplier of the product.

ElvenMishi · 05-04-2012, 10:29 AM

Quote:

Originally Posted by project.r.racing

install aftermarket tacho

I attempted to have an aftermarket tach installed but it didn't work. The installer said that the DEFI tach doesn't seem to pick up the signal from the coil.

Help!?!

ElvenMishi · 07-04-2012, 02:22 PM

Is there some kind of tach adapter that can convert mazda coil signals to make the stock tach or afterket tachs work?

project.r.racing · 07-04-2012, 04:12 PM

why not take it from the ecu?

derb · 07-04-2012, 04:23 PM

As I found out when installing my SAFC, there is no loom wire for RPM. There are a ton of places you can take that signal from though. I'm running my tach signal off the negative pole of my coil. You can also take it from the diagnostic plug which is back in the engine bay and leaves less wiring to be seen.

ElvenMishi · 07-04-2012, 04:26 PM

We attempted to get it from the Megasquirt 3 ECU but never figured it out. I'm looking for a more convenient option. I've been winning races with it but I keep breaking my axles during first gear launches.

Any ideas?

ElvenMishi · 07-04-2012, 04:30 PM

Quote:

Originally Posted by derb

As I found out when installing my SAFC, there is no loom wire for RPM. There are a ton of places you can take that signal from though. I'm running my tach signal off the negative pole of my coil. You can also take it from the diagnostic plug which is back in the engine bay and leaves less wiring to be seen.

Thanks Derb! I'll check with my electrician if they tried that and keep you posted.

323f Rock · 22-04-2012, 05:38 AM

We have this issue too!
It's because the stock tach is expecting a high level input and the new aftermarket ecu only gives a low level output. The stock tach should be able to be modified to accept a low level signal input but im yet to work out which resistor needs to be bypassed! Or as other members have suggested, take the signal from else where such as the coil

ElvenMishi · 22-04-2012, 11:46 AM

We tried getting it from the coil and it didn't work. I'll look forward to the resistor resolution.
Any other ideas?

TheMAN · 22-04-2012, 11:48 AM

you need to use the correct BP dissy and coil, that's your problem

ElvenMishi · 22-04-2012, 01:41 PM

If I may, how do I do it?

323f Rock · 10-05-2012, 06:12 PM

We sorted ours by running a wire from the negative side of the coil to the tachometer

21-10-2011, 09:34 PM	#24
ElvenMishi Junior Member Join Date: Oct 2011 Location: Cebu City Car: Astina Posts: 45	It seems like aftermarket is the way to go since a gtx ecu is hard to find in our area. Speaking of aftermaket, 360 infinite usa heads up display seems like a very interesting option for me. How would I know that the aftermarket tach and speedo I'm getting is compatible? Last edited by ElvenMishi; 21-10-2011 at 09:39 PM.

22-04-2012, 11:48 AM	#34
TheMAN Senior Member Join Date: Feb 2010 Location: USA Car: . Posts: 2,623	you need to use the correct BP dissy and coil, that's your problem __________________ Protege FAQ, the best 323/Protege/Mazda3 resource enjoyed worldwide for 10 years

20-10-2011, 08:50 AM	#21
derb Senior Member Join Date: Oct 2008 Location: Brisbane Car: 1993 BG Astina GT-X Posts: 1,822 View Photos By: derb	What Project.R said. My speedo is 10k lower than the actual speed I'm doing, but the tacho is fine, just has the 6000rpm redline on the gauge when really I can go to 7000rpm.

22-10-2011, 10:15 AM	#25
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	ask the manufacturer or supplier of the product.

07-04-2012, 02:22 PM	#27
ElvenMishi Junior Member Join Date: Oct 2011 Location: Cebu City Car: Astina Posts: 45	Is there some kind of tach adapter that can convert mazda coil signals to make the stock tach or afterket tachs work?

07-04-2012, 04:12 PM	#28
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	why not take it from the ecu?

07-04-2012, 04:23 PM	#29
derb Senior Member Join Date: Oct 2008 Location: Brisbane Car: 1993 BG Astina GT-X Posts: 1,822 View Photos By: derb	As I found out when installing my SAFC, there is no loom wire for RPM. There are a ton of places you can take that signal from though. I'm running my tach signal off the negative pole of my coil. You can also take it from the diagnostic plug which is back in the engine bay and leaves less wiring to be seen.

07-04-2012, 04:26 PM	#30
ElvenMishi Junior Member Join Date: Oct 2011 Location: Cebu City Car: Astina Posts: 45	We attempted to get it from the Megasquirt 3 ECU but never figured it out. I'm looking for a more convenient option. I've been winning races with it but I keep breaking my axles during first gear launches. Any ideas?

22-04-2012, 05:38 AM	#32
323f Rock Junior Member Join Date: May 2007 Location: Birmingham, UK Car: Mazda 323F BA GTR Posts: 22 View Photos By: 323f Rock	We have this issue too! It's because the stock tach is expecting a high level input and the new aftermarket ecu only gives a low level output. The stock tach should be able to be modified to accept a low level signal input but im yet to work out which resistor needs to be bypassed! Or as other members have suggested, take the signal from else where such as the coil

22-04-2012, 11:46 AM	#33
ElvenMishi Junior Member Join Date: Oct 2011 Location: Cebu City Car: Astina Posts: 45	We tried getting it from the coil and it didn't work. I'll look forward to the resistor resolution. Any other ideas?

22-04-2012, 01:41 PM	#35
ElvenMishi Junior Member Join Date: Oct 2011 Location: Cebu City Car: Astina Posts: 45	If I may, how do I do it?

10-05-2012, 06:12 PM	#36
323f Rock Junior Member Join Date: May 2007 Location: Birmingham, UK Car: Mazda 323F BA GTR Posts: 22 View Photos By: 323f Rock	We sorted ours by running a wire from the negative side of the coil to the tachometer