I tryed search and posting in Integra forum with poor results.

I'm trying to disable the JDM 180km/h speed governor from my PR3 ecu in my DA.
Since the stock DA wireing is the same as CRX and EF civic's and OBD 0 B16 swaps are comon, I'm hoping I can find an anser her.

I found the ECU pinouts and found the speed pulser wire witch come from the cluster to tell the ECU the vehicle's speed.

I need to know if the signal coming from the cluster is a variable pulse or a variable voltage? How do I determine this? How can I duplicate to confuse the ECU into thinking I'm only going lets say 80km/h? only all the time.

Here is the ECU pinouts I found with search:
speed pulser wire 18 in conector B

 

if you mess with those pulses you risk hurting the ecu, and the main reason for that speed input wire (aside the governor) is to make sure your meeting the minimum speed for vtec engauagment.

youll need an oscilliscope (sp?) and have to modulate the pulses.

then youll have to make a piece to replicate said pulses.

there must be some other way the chipping companies remove that for people.....

i mean if your honestly going to go so insane as to bust out with some custom fab electronic to fake speed pulses, why not just desolder the EPROM and get one for 20 bucks from the many places that sell them.

OR just send out the ecu...

i respect DIY stuff though i really do, but this is a pretty advanced thing youd be tackling there, with the risk of, lets say, causing the engine not to engauge vtec which would make that trip up to 180 kmph a really lengthy affair.

just my .02

but if your really serious about it, search on here for "s2000 cluster" and look at those threads, because in order to make those clusters work there is a custom speed pulse adapter that had to be made since the pulse width is completley wrong between s2000 and civic/integras.

those you can buy now as well, but if you found the person who made it, he would have experience in this field and you might be able to persude him to help you.

 

"An OBD0 ECU with an external EPROM is very simple to chip. First, cut all 28 pins with a razor blade or utility knife. BE CAREFUL YOU DO NOT SLIP AS YOU CAN PERMANENTLY DAMAGE THE CIRCUIT BOARD. It is not absolutely necessary to do this before desoldering, but removing the chip will make it much easier, particularly if you do not have a good desoldering station. Once the original ROM is desoldered and removed and you can see through the holes in the circuit board, add a socket for an EPROM and then place the new ROM you have created into the socket."

taken from:

http://www.pgmfi.org/twiki/bin...pping