Aftermarket Management Fuel & Ignition Maps

[locosaki 0]

I'm at the stage of trying to get my MI 16 going, I have the car idling but I'm unsure of the fuel/ignition values I should have in the table thus far, I do intend going to the rolling road to get it mapped but would ideally like it close.

 

My fuel values start at 0 to 255 (obviously 255 being the richer end of the scale)

 

The ecu is an old Lumenition I picked from ebay, I bought the security dongle so do have full access.

 

If someone has a map for say Omex can I transfer the figures over in to my Lumenition ecu to give it a good starting point before heading for mapping and having to start from scratch.

 

To give you and idea, My ignition advance at 100% load and 7000rpm is 36 degrees, Seems a good way out going by what I have read !!

 

Any help will be appreciated

[petert 601]

36 deg. at full load is way too much. Here's a map which is reasonably well sorted, but may still not be 100% applicable for your engine. 0kPa = 100% full load in your case.

 

You also need to verify that 10 deg. in the software equals 10 deg. mechanically before using it. Either lock the software at 10 deg., or make every cell 10 deg., then verify with a timing light. This may help http://www.taylor-eng.com/xu9j4/finding_tdc.html

 

You can't transfer fuel maps as some ECU's do it by number, like yours, others by injector time, others by volumetric efficiency (VE). You'll need to verify AFR's.

 

Also attached are the wide open throttle maps of a 2 row 139 chip.

Edited May 18, 2011 by petert

[locosaki 0]

Excellent,

 

Is this for TPS ?

 

I'll need to verify the timing figures on the car as you say.

[petert 601]

Is this for TPS ?

 

no, it's MAP in kPa. But full load is full load, whether TPS or MAP. However, load is not linear in TPS. So depending on the TB size, you could have 90% full load at 40% throttle opening for example. Attached is an 8V ignition map via TPS. Notice how in the 2500 range it quickly goes to 31 deg., then quickly returns to 24 deg. for the rest of that range. So cruising at 80km/h could be as little as 6-10% at TPS, whereas with map it will be at approx -60 to -50 kPa. That's why mapping via MAP is so much better. You get a lot better resolution over more load points.