Hay guys

Awhile back probably 2 years I got headers for my car and plugged up my egr on my manifold and haven't had it since. I was reading a thread if u remove your egr u should turn off the egr function in the ecu. Cause the egr ecu maps alters the ignition timing a fair bit and advanced quite alot when the egr valve opens?

Thankyou

I think its more of an emissions thing.

ive never herd of it doing that, its just recirculating the exhaust gas, so cant see why it would advance the timing. besides advance timing is good, more power :)

I ran the no EGR for years and it was fine. Yeah cant see how computer will advance timing over it.

http://tinypic.com/view.php?pic=1fvjug&s=6

That's a lot of advance at quite low revs too!

9 degrees at 1750 rpm at 40% load if I read that map correctly. Does this part of the map get used though? ie can you see the EGR activate and advance come on while data logging?

That's a lot of advance at quite low revs too!

9 degrees at 1750 rpm at 40% load if I read that map correctly. Does this part of the map get used though? ie can you see the EGR activate and advance come on while data logging?

That map definitely gets used. You need to know what to log. The "ignition advance" item in the standard Evoscan configuration is just the main map output, but there is another item ("corrected ignition advance") that can be enabled which logs the ignition advance that is actually used after various compensation factors (including EGR) have been applied. Unfortunately the MUT-II protocol, being proprietary unlike OBD2, isn't well documented and various people (including Evoscan) have had to infer/guess as what the loggable values actually are and what the scale ranges are. This list (http://code.google.com/p/ecurom/source/browse/trunk/documents/MUT%20requests.txt) is the best I've found but there's still a lot unknown.