Tricking stock ECU

[se7en]

Can anyone think of a way of tricking the stock ECU into not adding extra timing?

or taking timing out?

can I hack into the knock sensor to trick the ecu into retarding the timing?

cheers

7

[Stablo87]

I heard some one doing this with an ecu for a tiburon. Might wanna search that.

[mx3autozam]

Do what honda guys do..unplug the knock sensor.

[se7en]

I already unplugged it....

the reason is:

I am tricking the computer to add fuel by adding resistance to the CLT sensor to make the engine think it has to warm up(add more fuel)

unfortunately, it also adds timing.

I was thinking that I could simulate the knock sensor, and trick the ecu into removing timing under boost.....

any thought on this John?

7

[RS_OBD'oh_2]

you might be looking at a piggy back. I know it's a four letter word here, but it's also your answer. At the very least, I'd just check out it. (AEM Fuel / Ignition controller)

[Custommx3]

Do not unplug your knock sensor. Engine knock = bad!

[se7en]

I didn't, the knock sensor is bad though

[shameem]

Well, i would stop messing with the CLT and do what real tuners do - mess with the O2 sensor values directly to change AFR. I think i recommended O2 clamp to somebody before - you can probably look it up.....

If you do want to manage timing manually without engine management - look into MSD modules -
http://www.msdignition.com/tc_2.htm" onclick="window.open(this.href);return false;
Of course you will need an MSD ignition for that to work.

Megasquirt might work out to be a better option.....

[se7en]

ya, I am thinking that megasquirt will be the way to go

sounds like it will be the easiest way lol.

7

[wytbishop]

MAP ECU2 piggy back. I have already been in contact with them and a company that makes patch harnesses for them. I have the wiring diagrams for the 93 ECU which I could sent to you. Not sure on the differences in the pinout from 92 to 93.(EDIT: you could not use the same diagram as I have because I am not boosted yet, but they did the diagrams for me and I'm sure they would do the same for you.) The MAP ECU2 will cost you about $900 and the patch harness is something like $130. IT controls fuel and timing and has outputs for other functions like boost control etc.

I plan on doing most of the things you're doing and when I researched the MSnS it just seemed really tricky. Thats why I started looking for a good piggyback. I think this one is the best. They tell me they have had good success with Miata's on boost and the technology on that car is very similar to ours.

http://www.mapecu.com/map2.html" onclick="window.open(this.href);return false;

I'm not sure why everyone is so down on the piggyback around here. I have one on my bike and it's awesome. I can add or remove fuel at any rpm in 2 minutes.