tachometer
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02-06-2009, 09:53 AM
#10
Safety Car
lol wow talk about tacky...... you cant tap into any cables on the inside of the cars ecu but u can tap into one of the cables from the resistor packs off the sparkplugs. i dont know how the unit u bought gets its tach info but the acura is totally digital.
02-08-2009, 11:19 PM
#17
Former Whyner
Do you have the tach already? Its pretty easy to wire up. 4 wires + the loop wire to specify the 4 6 or 8 cylinder. I do recall tapping into a green wire to get the rpm signal. Then there is power ground and lighting wires.
Btw this is from what I remember when i hooked up my 5" autometer in my gsr back in 2000.
I would really just look into the shift light and get the rpm chips 6.0-7.0
Btw this is from what I remember when i hooked up my 5" autometer in my gsr back in 2000.
I would really just look into the shift light and get the rpm chips 6.0-7.0
02-09-2009, 01:47 PM
#19
Safety Car
other than tapping into a sparkplug coil pack which i dont recommend... u have to get a an alarm module that breaks down the pulsing dc current form the computer that sends it to the cluster....then u may have a chance at making it work but other than that goodluck....i went through every wire in the book from the ECM/PCM and bcm and nothing contains the rpm signal wire in anything other than pulsed dc.....which i dont recommend playing with.
02-10-2009, 09:02 AM
#23
Racer
I've had very good results using fuel injectors to provide the signal for the KPtechnologies shift lights. You just need to have a shift light that can work with a 1/2 ppr signal.
tripnbeats - almost all rpm signals are pulsed dc - why do you not recomend messing with them?
tripnbeats - almost all rpm signals are pulsed dc - why do you not recomend messing with them?
02-10-2009, 09:32 AM
#25
Safety Car
pulsed dc means its monitored by the computer through the CAN system its a digital signal until it enters the modules that decode them and show the info...like the stock tach on this car....the cluster is what decodes the whole "digital mystery" and gives you your info.....if u hook up an aftermarket tach to the digital line all your gonna get is a series of ups n downs in voltage from .1-5volts.
if you hook up to one of the plugs or injectors....thats not pulsed signal. thats just raw electricity going to the computer to be read compared and given to the tach in a digital manner. unless you have a module that reads and decodes the signal and its specific to give you tach reading....like an alarm/remote start bypass module for example...otherwise i wouldnt play games with it.
if you hook up to one of the plugs or injectors....thats not pulsed signal. thats just raw electricity going to the computer to be read compared and given to the tach in a digital manner. unless you have a module that reads and decodes the signal and its specific to give you tach reading....like an alarm/remote start bypass module for example...otherwise i wouldnt play games with it.
Last edited by Tripnbeats; 02-10-2009 at 09:36 AM.
02-11-2009, 12:51 PM
#27
Racer
pulsed dc means its monitored by the computer through the CAN system its a digital signal until it enters the modules that decode them and show the info...like the stock tach on this car....the cluster is what decodes the whole "digital mystery" and gives you your info.....if u hook up an aftermarket tach to the digital line all your gonna get is a series of ups n downs in voltage from .1-5volts.
if you hook up to one of the plugs or injectors....thats not pulsed signal. thats just raw electricity going to the computer to be read compared and given to the tach in a digital manner. unless you have a module that reads and decodes the signal and its specific to give you tach reading....like an alarm/remote start bypass module for example...otherwise i wouldnt play games with it.
if you hook up to one of the plugs or injectors....thats not pulsed signal. thats just raw electricity going to the computer to be read compared and given to the tach in a digital manner. unless you have a module that reads and decodes the signal and its specific to give you tach reading....like an alarm/remote start bypass module for example...otherwise i wouldnt play games with it.
Of course you can't hook a traditional tach up to a CAN bus - you would need an interface module that can decode the CAN signal and pull out the tach information for that to work.
Plugs and injectors ARE pulsed voltages as they turn on and off as needed to control the motor. When using these signals as a tach reference (for remote start, tach, shift light, etc) you are measuring time, not "raw voltage". By measuring the period of the signal you can calculate engine RPM. If the signal needs to be doubled (tach is reading half of what it should read) then you can diode isolate seperate fuel injectors (180 degrees from each other).
I guess what I'm trying to say is as long as you have the right pulsed signal (one that directly references RPM) there should be no problems using it. I've even successfully used a crank angle sensor to drive a shift light with no issues. The shift light was capable of ignoring inconsistent periods so that the "keys" of the reluctor wheel didn't mess the shift light up.
02-11-2009, 01:37 PM
#28
Safety Car
KP you are correct..... i didnt think of that when i was flappin. now that u said that...i can hear my teacher in the back of my head when we were learning isolation methods for alarms n starters and issues we would come across and how to resolve them if we werent using bypass modules. 
but its still not something id tell suggest to someone to put in the TL
but its still not something id tell suggest to someone to put in the TL
02-11-2009, 03:11 PM
#29
Racer
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dre271
1G CL Problems & Fixes
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03-28-2008 11:13 PM
2003, 2009, 350z, aftermarket, apec, bus, canbus, euro, hook, nissan, ppr, suspension, tach, tachometer, tsx
