Strange Issue...
 

So this is the weekend i decided to use to convert over to map... there will probably be a few more questions... but this is what i have for now.


So I have converted to a motorola 2.5 bar map, and corrected it to resemble the baro pressure since there is no wizard (offset is in the range of 25.xx). When i view parameters i get a linear change in voltage and it shows a difference in load.

i am also running a GM IAT sensor which i setup through the wizards.

currently running on stock injectors to eliminate variables in troubleshooting it being hardware vs software.


ok, so now that you have the background... i have the car up and running but when anything more than idle is tried, the load on the y axis (e.g. fuel map) doesnt change, but in the parameter window you can see it change.
i have checked the speed/density box so im not exactly sure why i dont see the change in the maps.


Might be basic, might not.

thanks,

Matt

Use a MAP sensor wizard, then replace the calibration numbers with yours (for the Motorola sensor)

thanks, i will try that.

I also called AEM customer support and was told to try reloading with the newest AEM software (even though im on the new release)


i will report back with my findings/issues that i still have.

The deal with the wizard is that beyond the numbers for the specific MAP sensor in the table it will also set all other flags needed to switch from MAF to MAP based calculations, so you won't have to manually chase option by option until you find them all. Then you put your numbers for your sensor and you're all set.

Thanks, it makes sense. i was just under the impression that was the "speed density" checkbox.

I have made the edits as your suggestion, and it now works. Thanks! i have retuned for the new breakpoints, but there is a dead spot with TPS or something. no matter what revs besides idle, the car surges RPM. with delta tps = 0. its 100% in the tune and im going to correct it but if you have suggestions with regards to that, feel free to give your 2 cents.


Also, the RC440's (SL9-440 with 13 ohm resistance) that i have dont physically fit into the injector holes in the intake manifold, so im calling up all my friends to find something that will work for me, but thats a completely different issue.


thanks for your help Jman.

What year is your miata? If you're a 1.6L you'll want to convert to a variable TPS. Makes a world of difference.

i am 1.6 and i have followed the nissan TPS mod.

Right now if i hold the throttle still, the car runs ~13.5:1 and then will surge to ~21:1 in free load revving which is my main issue. this obviously causes the revs to surge.

my setup is: motorola 2.5 bar map sensor, GM open element IAT, nissan tps sensor (tuned to read min 1.5% max 95% to keep the throttle based corrections in check), innovate LC-1 wideband, and i have a boost control solinoid, but its not hooked up.


Dustin, i actually have a copy of (probably an old) calibration of yours that i am using for a reference. it was one of the only ones that i could find of a miata on map sensor.

edit: here is a pic of my setup for those of you who want to see it.
Attachment 198796
The manifold and turbo were picked up here from splitime.

Hmmm, I have changed my map quite a bit since I last had it. My timing chart was junk, and my fueling was pretty bad too. It's still not great, but you might want to try it. It's currently set up for the AEM 2 bar sensor.

Honestly, I'd probably go and buy a gm 3 bar sensor and use the preset settings in the AEM sensor.

If you want me to send you my map just PM your email.

Cool, thanks dude. i will PM in a moment.

Im having some super messed issues with map conversion. The car has ran perfectly with maf, then i changed to map, changed the fuel map and i managed to get it to run. but it pretty much decides on its own when it wants to run properly, and it likes to jump around alot. not descriptive, im sorry...just venting.

One of your main problems might be that your fuel/ignition cells have all shifted. When you change to a MAP sensor it will adjust the Y axis of the chart with the appropriate intervals for the map sensor. So like if you went to a 3 or 5 bar map sensor, there would be much larger gaps because the table is only 16x16. I'm guessing that when you did the change to MAP, it's changed your tables so much that the car won't run right.

yeah, i know it changes the load breakpoints. maybe i will hook the maf back up and load the previous tune i have for that and datalog that with the map sensor as well.

will help me get an idea for the map load vs fueling.


Exactly what maps change when converting my maf tune over to a map? obviously there is the primary ignition and fuel maps, but are there any modifiers, idle, or engine starts that need to be changed? most of the modifiers are just % change... but im not sure what im missing.


I am thinking that my issue is my sensor.... i have a honda sensor here from an old project so i will wire it in and see if it works from the wizard...

I think the only other section it would affect is the boost control section, because it's also load based.

i dont have that hooked up yet.

Btw, i pm'd you my email dustin. anyone else who wouldnt mind sending their cal's and setup... that would be appreciated.

my email is m.moore13@hotmail.com

the issue is now gone. i swapped map sensors to one that was in the wizard, retuned for new breakpoints and it runs like a new car.

im sure i will have more questions, but for the time being i just want to say thanks to everyone that has helped me this far.


edit: just set up my fuel map with dustins numbers up to 0psi guage and then used linear interpolation for fueling above that.
Car runs very well now, and i can actually drive it again. im a happy boy.

Have many people converted their 90-93 from batch fire to sequential?

Looking at the ECU pinout, the non cali versions are batch fire fuel. i would think that this would be nice to do.

i will compare the calibration from CA to non CA versions to see calibration differences to run it but im just curious for the time being since im wiring in my new injectors now.

ok so answering my own question... inject tooth numbers change, and you turn on Injector 3+4 plus change some wiring.

How far off will my fuel map be, and does everyone run the inject tooth that is given for the CA versions on non CA cars (i.e. is my CAS going to give the proper output for those settings to work?)

Sorry for the questions... but i feel they are partially educated at least.

Search is your friend noob: https://www.miataturbo.net/aem-59/aem-ems-sequential-cop-issue-28029/

And here: https://www.miataturbo.net/showthrea...028#post318707

for some reason i didnt see your new posts Rafa. thanks.


I forgot to insert the word FUEL. 90-93 non CA is different and uses batch FUEL.

That being said, there is a little info on the second thread about injector phasing.
Is my 90-93 Eunos (JDM) going to have the same CAS to read the same values?

When i compare the 90-93 non CA calibration to the 93 CA version, the inject tooth values read the following:
#01 2.04
#02 1.04
#03 3.04
#04 0.04

Thats all fine and dandy, i just want to make sure my CAS is going to read the proper values when i convert to that (before i convert to that). i.e. is the Cali CAS different?


Thanks

The CAS signal is the same for all '90-'97 cars. With that pattern the startup AEM EMS calibration for '90-'97 Miatas reset the tooth counter at cylinder 4 TDCC