Well I just picked up a digital gauge cluster and am going to install it soon. I don't know what the mileage on the other prelude was(it was from a salvage yard) but I am sure it will be lower than mine. So I was wondering if there was a way to roll the digital odometer up to my actual mileage? I know the mileage is stored in the gauge cluster but didn't know if there was any way to access it?!?!

I searched but only came up with failed digital odometers and rolling normal ones..

 

only way would be to find the memory portion and resolder the board with a new one or if ur very smart in electronics make ur own system solder it in and adjust it. thats what i read on some other site. seems right maybe not.

more work then you wanna do

 

the mileage is stored in the circut board usally a EEPROM like a 93C46 but unless you have the proper soldering equipment and skills you will destroy it before you get it off the board so the seafe bet is to swap out the odometer part as it's seperate .

 

I know there where places online that would adjust digital motor cycle gauges to the right mileage.

http://www.bluegauges.com/ You might want to check with them if they can do it. or like the poster before me said. switch out just the odometer part.

 

all you have to do it power, up plug your cluster in and get an adjustable signal generator, connect it to your vss wire and start rolling the miles on, I think it is 4 pulses per turn. A square wave should work, but you can adjust to whatever works if that doesnt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">all you have to do it power, up plug your cluster in and get an adjustable signal generator, connect it to your vss wire and start rolling the miles on, I think it is 4 pulses per turn. A square wave should work, but you can adjust to whatever works if that doesnt</TD></TR></TABLE>

so this is after its in the car? and where would I get an adjustable signal generator? never even heard of it..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">I know there where places online that would adjust digital motor cycle gauges to the right mileage.

http://www.bluegauges.com/ You might want to check with them if they can do it. or like the poster before me said. switch out just the odometer part.</TD></TR></TABLE>

thanks.. if i get to the point where I want to spend 40 bucks I will shoot them an email to see if they can help me.

 

or you just can sell it to me, and find one that has closer mileage to yours.

 

lol i would like to know about this signal generator any way to reverse mileage?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">all you have to do it power, up plug your cluster in and get an adjustable signal generator, connect it to your vss wire and start rolling the miles on, I think it is 4 pulses per turn. A square wave should work, but you can adjust to whatever works if that doesnt</TD></TR></TABLE>

yeah i was gonna say just get a signal generator, and crank up the frequency and hope that the odometer roles over once you reach all 9's, it may just stop, or it may roll over..

 

hmm lol someone try this. hell where can you get a signal generator? radio shack?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">

yeah i was gonna say just get a signal generator, and crank up the frequency and hope that the odometer roles over once you reach all 9's, it may just stop, or it may roll over..</TD></TR></TABLE>

bahaha.....I'm pretty sure it would roll over. I could do this in lab, but I bet one of those signal generators costs a pretty penny.

We should hook the vss output up to an oscilloscope and figure out what it actually outputs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">

bahaha.....I'm pretty sure it would roll over. I could do this in lab, but I bet one of those signal generators costs a pretty penny.

We should hook the vss output up to an oscilloscope and figure out what it actually outputs.</TD></TR></TABLE>
do it lol and let us know, id love to set mine to mileage per motor (or body) both are lower then what my el says i have.

 

you can build a signal generator, they are very simple. Here is a schematic and all the calculation you need to determine frequency and duty cycle



also here is a graph for those of you that don't want to do your own calculations

 

^^ Can anyone put that into laymans terms for me. LMAO

Sorry but I don't understand that one. --over my head

 

Its just a chip that will generate a square pulse signal, adjusting the resistors and the capacitor adjust the frequency and duty cycle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">Its just a chip that will generate a square pulse signal, adjusting the resistors and the capacitor adjust the frequency and duty cycle.</TD></TR></TABLE>
yeah so the higher the frequency the fast the odometer will rollover. don't go to high, who knows how fast a sample rate the odometer can understand.

 

I think the best way to do it would be connect the cluster to your car and tap your circuit into your VSS wire. I don't know how fast your ecu will let it read, but for the sake of time i guess the faster the better, you would have to know the factory tire diameter to be able to calculate the correct combination of resistors to equate to a desired speed. I think something in the neighborhood of 80Hz would be reasonable number to use. Using the graph I posted you can pick resistors and capacitors that would give you around that frequency. All these parts should be available at your local electronics parts store

 

Are we very sure this thing uses a square pulse?

I suppose that makes sense, but I'd like to know for sure before I send signals into my $400 ecu setup.

 

all this is slightly beyond me. but if someone tries it I will educate myself and do it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">I think the best way to do it would be connect the cluster to your car and tap your circuit into your VSS wire. I don't know how fast your ecu will let it read, but for the sake of time i guess the faster the better, you would have to know the factory tire diameter to be able to calculate the correct combination of resistors to equate to a desired speed. I think something in the neighborhood of 80Hz would be reasonable number to use. Using the graph I posted you can pick resistors and capacitors that would give you around that frequency. All these parts should be available at your local electronics parts store</TD></TR></TABLE>
factory tire size is 205/55 - 15

 

well I am not positive it sends a square wave but, im nearly 100% positive it will not break anything by sending it an incorrect wave, granted you do not send a wave above the factory voltage. Secondly even if it does not send a square wave it could probably still read one because it looks for peaks, and it would see the peak on a square wave just as it would see it on a sine wave.

 

Thats probably right, though did you ever think it could be a DC signal, its unlikely, though it could use some sort of variable resistor that adjusts with speed.....

well....probably not....
ok /that idea

does the odo get a signal from the ecu or straight from the vss?

anyways, I'd like to know what the signal is, and I bet its a 5v signal btw

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">
does the odo get a signal from the ecu or straight from the vss?
</TD></TR></TABLE>

I am willing to bet it goes throught the ECU. 4ws cars rear turning is adjusted based on speed as well is PS.

 

i say u just do wut ferris bueler did n jack up the wheels, put a rock on the gas pedal, n let her spin haha