Hi

I have a problem that I have a hard time getting around.
I am thinking if it could be something about Acceleration fuel map settings.

If anyone take a look at my logs I would really appreciate it.

I know that my fuel map is pig rich nearly all over, but I cant seem to richen it enough en the areas where I build up boost after shifting

regards
Gudmundur

 

What kind of file is that? When I unzip I get a "microsoft setup file" with a stf extension.

Never mind I see now this is in the AEM threads.

 

 

how is your boost sensor mounted? my guess that itis NOT directly onto the manifold.

the lean spike has a lot to do with the lag time from the sensor reading boost within the manifold!

any legth of line adds delay to my aem sensor.....honestly.

as your boost after shift trace looked similar to mine when i ran a hose to my sensor.

i still have a lean spike/knock issue after shifts, but by installing this device to mount my aem boost sensor onto my oem manifold, a majority went away.

look @ the difference between 12 / 19 psi!! let alone the time delay to!

same sensor, 1 is mounted with this mounting block from rre:
scroll midway down to Manifold Differential Pressure (MPD) Sensor Adapter
http://www.roadraceengineering.com/newproducts.htm

dont buy the evo unit, as they charge $40- more on the website??

& the other way was having the sensor "t" into the oem location for the fuel pressure regulator & oem boost line.!!

 

Thanks again for the help WOT

I actually have an Euro EVO VIII which doesnt have a MDP sensor.
So I connected my MAP sensor where the BOV is usually connected, and I moved my BOV on a "T" where the fuel pressure regulator is connected.

I needed to have about 30 cm of hose from the manifold to my MAP, but I am going to try to minimize that.

Thanks again for your answers

regards
Gudmundur

ps: have you by any chance done any boost compensation tuning ?

 

Off the top of my head it sounds like the throttle Inj correction map isn't being used to its full potential along with too much or too little throttle accel pump enrichment.

This would be very hard to tell from a log, you would have to post your cal to look at.

 

Hi

I would really appreciate it if you would look at my calibration.

regards
Gudmundur

 

Ok gudmundur you have some work to do. I can see several things that could use some vast improvement to your map. First is that you are running a traditional style mapping and not utilizing boost compensation to your fueling. What boost compensation will allow you to get much more granular on your fueling by lowering the MicroSec/bit. The MicroSec/bit is what sets each raw adjustment (0-255), when you use boost to correct your fueling you don't need to use your 255 points of adjustment for each map level (psi fuel level) because the "Boost Fuel Correct table" is already doing this for you. Then you can use your 255 points of adjustment to really dial in your fueling. This is what I suspect part of your problem is, the other part of your problem is that you could take much more advantage of the "Throttle Inj Correction" map, this adds or removes fuel from your base fuel map depending upon your throttle position, this will also help with your accel and decel fueling greatly. Your throttle accel pump doesn't look too bad right now but will need some fine tuning once you get everything else lined out.

You have some work ahead of you but keep at it and learn it to the best of your ability to ensure you have a complete understanding of whats going on. There are some great posts discussing boost comp mapping on the AEM fourms to get a better idea of what I am talking about.

 

Hi

Thanks for the information.
I am learning as I go along and I appreciate all the information I can get.

I have been reading about how to set up a boost compensation fuel map on AEM forums.

From what I understood there the best way to convert a normal 3d map to a boost compensated map would be to get the boost low as you can and as flat as you can .. by running on just wastegate spring pressure rate.

I did so but my boost is far from being flat on my FPGREEN 20g9-lt it rises to 13psi at 3200rpm and then again at 5000ish rpm it rises to over 20 psi so I got stuck there on how to get a good reference to copy up and down each row to be able to switch to boost compensation.

By the sound of it am I on the right track ? or is there an easier way to do it ?

Regarding when I change the MicroSec/bit is the only other parameter that I need to think about the crank time table ? I kinda got the feeling from some posts on AEM forums that there were other parameters that MicroBit/Sec would affect.

Thanks again

 

Sounds like you are on the right track but you just need a push to dive into it. Remember you can always go back to your pervious map.

The change is not as impactful as you would think becuase most tables read off your main fuel table, the Crank inj time doesn't. So once you get it lined out you will smoth other pieces of the puzzle out as well.

 

Ok

Going to work on it this weekend

 

I have a hybrid boost comp fuel map working now.
And like GTVEVO said it is not as impactful as I thought.

My lean spike getting on throttle after a gear change is still there.

I have been reading up on "Throttle inj corr table" and from what I read it is used to lean out a boost comp fuel map on partial throttle.
But I cant figure out how I can use it to richen up my lean spike.

If someone could explain this a bit better to me I would really appreciate it

regards
Gudmundur

 

There is normally no need to adjust fueling based on absolute throttle position (the factory ECU doesn't either). It's used on a strictly boost comp map because straight boost comping doesn't work well once you get into vacuum and low throttle angles. IMO, a better setup is boost comped in boost only, and 3d in vacuum.

 

Hi

I thought so to and that is why I set my map up that way

For a lean spike getting on throttle after a gear change, I think I am beginning to understand the accel fuel maps, am I on the correct path ?


regards
Gudmundur

 

Aside from something physical like what WOT mentioned about the MAP sensor pacement, the accel pump is a good place to start. When I get home from work I can take a look at the log and cal to see if I can offer any real help.