Ecu tuning

[myk]

I get the p13 as part of my complete swap, I plan to have some kind of data logging/monitering. Question is if I chip that ecu how do you install a serial port to the ecu / what wires/connections need to be sauder. lol im thinking to far ahead AGAIN!!!. Please dont hurt me

[deevergote]

Chipping the P13 is uncommon... which means it's not a smart thing to do. Look for a P28 or P72. In addition to that, you'll need to get a wideband o2 sensor and link hardware (I've see Zeitronix stuff in action on my own car... I liked what it did). An emulator is also very useful (the ostrich is what Midnite Racer X used on my car)... with that you can upload the map you're writing without having to burn a chip each time you want to test it... You'll also need a good laptop running a program such as Uberdata or Crome.

Finally, you'll need to learn a hell of a lot! People fly Midnite Racer X all over the country to tune their cars because he knows how to do it... it's not all that simple to do properly!

Check out www.pgmfi.org for some info. Also read up on the board here (anything by MRX is good stuff). www.homemadeturbo.com also has some good tuning info.

[92ex]

Finally, you'll need to learn a hell of a lot! People fly Midnite Racer X all over the country to tune their cars because he knows how to do it... it's not all that simple to do properly!

That's only because people do not take the time to understand all the variables that affects tuning. Midnite is one of the few that fully understand it, which makes him so good.

[Accord R33]

Chipping the P13 is uncommon...

not just uncommon...damn near impossible.

[deevergote]

That's only because people do not take the time to understand all the variables that affects tuning. Midnite is one of the few that fully understand it, which makes him so good.

Right. It's really just a matter of studying, and understanding what it is you're studying. I could understand it if I took the time... I just haven't had the time or focus to do it properly. It's something that requires a good deal of dedication.

And Eric, I figured that was the case. I've had people argue with me numerous times (accordinglynice being one of the main ones) that said the P13 WAS chippable... I never saw it done, but I won't discount the possibility. It's certainly not a beginner task, if at all possible. The P28 is a well traveled path.

[MRX]

the p13 is chippable...BUT the trick is finding a rom editor/program to burn to an external eprom that the ecu can actually understand. After u get a migraine trying to make the p13 work you'll end up getting a p28 or some variant of the sort.

Also why i say that the p13, p14, pt3, and so on are not chippable by conventional methods

[myk]

well looks like the p13 isnt the way to go, kinda explains why I couldnt find much on chipping it lol. I'll probably run with it for a while until I can get a p28 or somethin and a wideband o2 sensor. I am slaving over various automotive forums and information sites to learn more. Also I know quite a few honda gearheads one of which is an actual tech that I can ask for info. MRX ive read quite a lot of ur posts already, man do u eat and sleep in ur cord?


BTW I already built a pc for my car and im starting to make the mounts for the touch screen lcd. I'll get some pics up soon, but i gotta hit the 30 post mark for a members ride thread , It will run uberdata in the future and store all my songs

[ACCLUDE91]

You can remove the old ROM, copy it, chip the ECU and burn the factory ROM info onto a new chip and it will run fine. If you understand hexadecimal and how to locate the fuel/ingnition curves then you can use the chipped P13 to tune. Of course you'd have to know what you're looking for and you'd have to know what to change it to. The problem is that almost no one does. Currently no bin editors support the Accord/Prelude ECU platform. They run "funky" if they even run at all when trying to use Uberdata/Crome/etc. Everything you need to change is in the hex code but it's trickey figuring it out and very time consuming. That's why it's not commonly done yet.


Even though it may not be realistic to chip it (for now at least), you mentioned that you mainly just wanted to datalog with it. It won't let you make any changes to anything but at least you could view pertinent information on your laptop. The P13 does have the CN2 datalogging header. You could use that and then use a piggyback unit to tune. It's not the most accurate method but it gets the job done. Otherwise for affordable standalone management you're stuck using a P28 or something equivalent.

[MRX]

You can remove the old ROM, copy it, chip the ECU and burn the factory ROM info onto a new chip and it will run fine. If you understand hexadecimal and how to locate the fuel/ingnition curves then you can use the chipped P13 to tune. Of course you'd have to know what you're looking for and you'd have to know what to change it to. The problem is that almost no one does. Currently no bin editors support the Accord/Prelude ECU platform. They run "funky" if they even run at all when trying to use Uberdata/Crome/etc. Everything you need to change is in the hex code but it's trickey figuring it out and very time consuming. That's why it's not commonly done yet.


Even though it may not be realistic to chip it (for now at least), you mentioned that you mainly just wanted to datalog with it. It won't let you make any changes to anything but at least you could view pertinent information on your laptop. The P13 does have the CN2 datalogging header. You could use that and then use a piggyback unit to tune. It's not the most accurate method but it gets the job done. Otherwise for affordable standalone management you're stuck using a P28 or something equivalent.

the ecu has to have an external eprom to enable datalogging tho. The rom editors have to have it enabled.

[ACCLUDE91]

Giving me more hexadecimal work I see

I could have sworn I've seen successfull P13 datalogging......I'll try to dig up the link I'm thinking of but it has been a while.

[accord93racer]

you cant chip a p13? i bought a chipped p13 off of ebay. did i get had or can someone actually chip it?

[myk]

Ya I was gonna data log for a while see how everything ran with various setups, and also have a gtech on the side. Eventually I want to do some tuning but for now I just want to learn how everything works together. A dyno would be better than the gtech but there isnt one near here. Im new to a lot of stuff just figured monitoring/data logging and learning how everything works together is good step in learning more about your engine.

[ACCLUDE91]

Get a wideband O2 for serious tuning. That's the info you need to datalog to tune properly. The ECU datalogging is pretty basic info like RPM, SPeed, Coolant temp., and other stuff. You can modify the ECU to datalog other things as well, but it isn't the best info to tune by.


Yes, it it possible that you bought a chipped P13. Only issue is that you probably won't be able to find anyone that can tune it for you yet. You're stuck with buying generic "spoon" and "mugen" chips with no real tuning done to them yet.


BTW, To datalog with the P13:

Location 0043h - Interrupt Start Which jumps to either 004bh or 00dbh... When writing your datalogging code put your code at 000dbh as that's the main section that's called... or use the vector pointer at 0020h to specify a new interrupt location...

SRBUF: 07dh STBUF: 07ch

It's in the PGMFI wiki

[MRX]

cool, so u can datalog it without an eprom. They figure new stuff out all the time.