Dakota Digital tacho signal modifier
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- Skylinefreak
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Dakota Digital tacho signal modifier
Anyone have a working one that I can buy?
Re: Dakota Digital tacho signal modifier
What are you trying to do ? What management and what tacho ?
All else fails you can get a trigger from the neg side coils via a circuit into tacho..
All else fails you can get a trigger from the neg side coils via a circuit into tacho..
- Skylinefreak
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Re: Dakota Digital tacho signal modifier
At this stage OEM RB25 signal into R31 tacho (not yet sure exactly what the tach needs to work...) but I should probably get the Link wired in first and see if the 12v signal on that will drive the tacho. Else I'll need something that can put out more voltage (if its a high drive tacho)
Re: Dakota Digital tacho signal modifier
R31 tacho is a back emf type trigger tacho. RB25 ECU tacho out is totally different.
Id would use a coil neg back emf circuit to drive the tach.
I have a r33 instrument display, can you use it at all ? May be the easiest to make work..
http://www.haltech.com/wp-content/uploa ... utput1.pdf
Id would use a coil neg back emf circuit to drive the tach.
I have a r33 instrument display, can you use it at all ? May be the easiest to make work..
http://www.haltech.com/wp-content/uploa ... utput1.pdf
- Skylinefreak
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Re: Dakota Digital tacho signal modifier
Ok, little bit more information after fiddling around last night.
The RB25 ecu rpm output signal is ground (0v) pulses. Not 5v like some forums say - measured it last night. In other words GND - open - GND - open etc.
I tried the 5-pole relay circuit that you posted Barry but it didn't work.
The R31 revcounter signal originally came from the ECU as well from what I can figure out, but I don't know what that signal was...
I'll try my best to make the stock one work, if that fails then I'll appreciate the R33 cluster option, swop the revcounter internals over into my cluster. Thanks Barry!
The RB25 ecu rpm output signal is ground (0v) pulses. Not 5v like some forums say - measured it last night. In other words GND - open - GND - open etc.
I tried the 5-pole relay circuit that you posted Barry but it didn't work.
The R31 revcounter signal originally came from the ECU as well from what I can figure out, but I don't know what that signal was...
I'll try my best to make the stock one work, if that fails then I'll appreciate the R33 cluster option, swop the revcounter internals over into my cluster. Thanks Barry!
- Skylinefreak
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Re: Dakota Digital tacho signal modifier
Not needed anymore, got my rev counter working!
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Re: Dakota Digital tacho signal modifier
How?
"I'd rather lose by a mile because I built my own car, than win by an inch because someone else built it for me"
- Skylinefreak
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Re: Dakota Digital tacho signal modifier
Built the 'wasted spark tacho booster' from the Dicktator website using a VW TCI unit (TP100) from Goldwagen and a 5-pole relay without the internal switch.
This won't work for a RB25 in a S chassis as the rev counter in that is set up for a 4-cyl.
This won't work for a RB25 in a S chassis as the rev counter in that is set up for a 4-cyl.
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Re: Dakota Digital tacho signal modifier
nice dude out of the box thinking right there
"I'd rather lose by a mile because I built my own car, than win by an inch because someone else built it for me"
- Skylinefreak
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Re: Dakota Digital tacho signal modifier
Yup good friend of mine who is a whole lot more electronically minded advised me to try this. Also, R320 worth of solution vs R1900 for the signal modifier is a winning situation!SonOfAnarchy ZA wrote:nice dude out of the box thinking right there