Management Systems

Toby and Daniel, in simple Afrikaans:"Ons ander ouens is rekenaar gestrem".

Onother idea, Derek, WooHaa and me, we will serve Daniel and Toby with beers and coffee. May be our chips will then be addressed too.

Sorry for the technical stuff guys, but this stuff really interests me! Of course, I am scared of blowing up my ECU (which might be a good excuse to get an aftermarket one :idea: ) but I must say that after Chip Logic (*spit* 😈 ) remapped my ECU, the car is much more driveable and I get more torque low down in the revs! I wish I knew what size injectors they put in, 'cos then I could modify my map for any other injector.

Freddie - the PIC story, yes I am still keen on it and want to get back to getting that going too! Electronics stuff - bring it on! Spanners and stuff, I can't do 😳

You can say that again Freddy, Eproms ECU EEEEE-lost thats what I am.

Bring me a nissan sx and i'll EEEE-drive it!!!! 😂
I like electronics aswell, it dosn't mean I am EEE-qualified
from the EEE=Looser 😕

You know what, i know a fair share of some teck stuff but Gees you guyes lost me there!! im more into the spanners and tuning the mechanick`s side of stuff!! like porting the head and fitting new stuff!! 😉

isn't that exactly why were a club? not to suffer alone in silence, but to swop knowledge. You can't all be perfect (like me).

I will let you know when I find some of that knowledge stuff 🙄 hehehe

The only problem is that that tree of knolage does exactly the opposite :!: 🙄 LOL 😀

Here's a simple explaination of ROM's and ROM editors and what they do:

- As you know, the engine contains many sensors all hooked up to the ECU (engine control unit). The ECU is basically a microcomputer.
- With electronic fuel injection, the ECU needs to tell the injectors when to fire, and for how long. It also needs to tell the coils when to fire the spark plug.
- The ECU does this by using a lookup table that says something like: at 500rpm, under ideal conditions, open injector for 10 milliseconds per cycle. At 3000rpm under ideal conditions, open injector for 50ms. etc, etc, etc
- This lookup table is pre-programmed into a memory chip called an EPROM (erasable programmable read-only memory), by Nissan.
- The ECU will adjust values in the lookup table depending on non-ideal conditions (for example detonation or engine too cold or air flow too low, etc.)
- The lookup table is thus important to the power delivery of the car. It can be changed for more fuel efficiency, or more power, or even both. Nissan obviously tuned it as best they can for Japanese conditions (including high octane fuel).
- The ROM editor allows you to read the contents of the memory chip, and then change the lookup table (and other things) to suit what you want. Thus, you can get more torque in the low rev range by adjusting the fuelling and ignition timing in the lower rpm, without affecting the top end, etc.
- Once you have edited the memory contents, you can then program that back into another memory chip, and replace the standard one with the new one.
- In addition to the fuelling maps (lookup table for injector), there is an ignition map (lookup table for spark plug firing) as well as a map of how the air flow meter works (so if you swop AFM, you must update this map in the ROM), and there are also rev limiters, speed limiters, etc.
- The cool thing is that you could put more than one map onto a chip, and then use a switch to switch between different maps. For example, you could make a map with a speed limit of 100km/h and rev limit of 5000rpm, and use that when you leave the car at a garage or lend the carf to a friend 😉 This kind of setup requires the building of a daughter-board though, so it's not that easy.

Hope that sheds some light on the subject. As you can see, there's lots of potential here for free power! It must be noted tho, that ROM editing is not an art - it requires lots of technical understanding of the combustion process, as well as a dyno to test your changes to make sure you're getting what you want out of the tuning process. Most of the tuning shops do this by trial-and-error.

well said toby.

Unfortunately the old arse dyno doesnt cut it.
this may be of interest to someone

A home dyno kit

Thanks for the explanation, so when are you building a daughter board, mother board or sister bourd for me, tested by you?

When you've paid me a rediculously huge sum of money 😂 hehehe.

Toby anDaniel, http://www.blazt.biz/index.html. This interested me, so I emailed Jason the Manager of Product company. And bad news this software is not working on he CA18DET. It looks to me the problem may be the connector. The one that Daniel showed for the ECU checker box.
If that is the situation, what about mods????

Iv'e looked into that before freddie, it cant be done with the CA's ECU because it doesnt support consult no matter what you do to it, its too old 🙁

Which is why, Freddie, we need to get that PIC programmer working, so that we can build our own interface to the ECU and sensors. I spent last weekend and the weekend before trying to get the programmer working again Freddie, but no luck! Neither my programmer nor yours works 😢

Toby, get rid of it. Dustbin is the right place. We rather look into other programmers from scratch again.

Well, not so fast - I tested the lines for correct voltages, etc. and it looks good - in other words, the hardware looks fine! Maybe we should meet up so we can debug this problem?

Good, any idea when. We can make a plan. Weekend or else.

I got a programmer that works for pics and EEPROMS. and programming software. I use it all the time, works 100%

George, that sounds great speak to me please. What can you teach me?
What about discussion with Toby and we get together to finalize.

Gremlin - Is that the PIC Start programmer? I had one of those, only problem with those is that you need to remove the chip from the circuit to program it. Still, would be mighty useful if I could borrow that so I can figure out what's going on with my programmer.