I am posting under this name as my sn doesnt yet work for whatever reason.

I am looking for a solution to an ems on an MKIV, i talked to jeff @hpf earlier today and he was a great help, however, now we cannot get my car to run with anything other than 10.8:1 at idle, no matter the mapping. There is a solid miss in the car now, and it will not respond well to throttle, the response itself is crisp, however, the car stumbles even with a leaned out map that is on there, based on the load situation. The car has an FJO wideband, MSD 96lb hr injectors, titan rail, twin denso pumps, AEM 5 bar map, and AEM/GM IAT, as well as an HKS DLI. The wideband voltages we entered off of the table that comes with them doesnt seem to be working as we are getting different readings from the aem to the FJO display itself. Im not quite sure where to go with this now, as we are kind of stuck with the maps we have. We arent quite sure what settings modify others and we cannot track down what to do. I was looking for the automapping as it may compensate for the problems we cannot track down, as we are not very familiar with the aem itself anyhow... i have a bunch of diff. maps now, but the best so far has been the one that jeff@hpf walked me through on the phone, thanks a bunch for that man, i would be stuck without you helping me out with that!

aside from that, i think i have mentioned everything i have and if not please let me know.

thanks
Mark

(again, pretending i am chris as he is too busy with MY car haha)

btw, the car is a 6 sp if that makes any difference with the settings themselves, as i think it doesnt, but im not too sure!

Hello Chris

Have you sorted out your initial problems, if not shoot me the CAL file at khorn@mail.dk and I will take a look - sometimes 4 eyes see more than two :)

Sounds like your car is not entering the idle condition. I'm sure you did this, but make sure your throttle position is between 0 and 3% at idle, but not zero or 3. Also make sure that your idle parameters are set at these #'s. Then set up your o2 feedback to lean out in this area.

Chris.

Karsten, ill have to get the .cal file for you after mark gets back from his cruise, probably around monday. monday will have to be a busy day as the car is going back under the wrench too. ill pass word to mark to send out the file.

I set up the entire idle option table and map, specifically the idle target vs coolant temp (lower right table) and the Idle% vs rpm correction table (top left), from 1700rpm down to 500. all my learned Idle % is between -3% and 2%. it doesnt stall out like it used to, so the idle maps seem to be completed.

chris, the TPS % are exactly as the User guide specifies, above 0 but below 3%, they are closer to 1% realisitcally.

thanks guys

Hello

You properly have done this as well but make sure that you have synched the ignition value in the EMS with actual values. Next, make sure that you see the same AFR value on the FJO gauge as in the EMS. If not, adjust the O2 gain to get the correct value indicated in the EMS. I guess that you have entered the correct calibration curve for the FJO WB you are using. Also, make sure that all other car specific sensors are setup correctly, I'm thinking about the MAP sensor, IAT sensor etc., you can use the wizards for all of that - nice and easy. Remember to select the correct injector in the wizards as well, it is important as it connect correspondingly with the correct "battery offset table" for your MSD injectors. If the table is not correct you might experience poor idle and the tip-in will be poor as well.

My personal experience (not much:) ) is that it is always easier in the long run to start up with the supplied base map and work it out from there, there are so many parameters one can play with and if you are using a CAL file from somebody else you never know what have been messed with.

As you have rather large injectors it could be a problem to get the car to idle at 14.7, you might have to run it a little richer in order to stabilize it - especially if you don't have the new AEM injector driver. It is, as you properly already know, a problem to run big injectors at a very low duty cycle due to hysteresis etc.

Regarding your problems with the idle it could be a resolution problem in your fuel map, try to right-click at it and select "RAW" presentation - if it show values close to or 255 you need to "rescale" the fuel map (changing the microsec/bit) in order to obtain max resolution.

Bottom line, I think that there is a problem with sensor setup as well as with your WB information, especially the MAP sensor is paramount in order to tune correctly. Make sure that the read-out of the MAP sensor is valid, you can check that by watching the parameter for "engine load" with ignition on but no running engine - it should be indicating atmosphere pressure, i.e. 100 Kpa or 0 Psi - If not, you have to fix it (you can adjust the "offset") before any tuning starts.

It seems like many people prefer to leave the "O2feedback" off until the fuel map is dialled in but I hate driving a car with too lean/rich AFR so I do it the other way around :)

Before I'm taking the first drive I will setup "O2feedback" so it can adjust fuel +/- to max values, I then drive around with my laptop and by looking at the "O2feedback value" I will adjust fuel cell by cell with the +/- buttons until it sits around 0%. By this way, the mixture will always stay at the values you have entered in the "O2 FB target map".
You don't have to do all the cells as the AEM can calculate in between. If you go the "BOOST COMP" route that cannot be done this way obviously :)