eliotroyano
27th May, 2016, 02:30 PM
Hi friends. I need some advice about what can cause a weird issue. This problem is from a VAG 1.8T drive by cable petrol based engine with M383 ECU. The problem is a sudden AFR step down that occurs after boost ramp finish. All hardware was checked many times without any issue or leak.
The attached pics shows you , AFR(purple), boost (blue), RPM (black), EGT (red) & oil pressure (green) of my datalog system. In these pics I have remarked a zone where AFR changes abruptly (almost -1.0 AFR) aprox. in the same area all time under boost. Also attached are some log extracts from a bigger log. In general max load barely pass 10.5ms.
Log1 --> http://i66.tinypic.com/fqu0g.jpg
Log2 --> http://i66.tinypic.com/2vxq03o.jpg
log3 --> http://i66.tinypic.com/2r5gcom.jpg
Then do you know or have seen that kind of behaviour before? What could cause it?
The attached pics shows you , AFR(purple), boost (blue), RPM (black), EGT (red) & oil pressure (green) of my datalog system. In these pics I have remarked a zone where AFR changes abruptly (almost -1.0 AFR) aprox. in the same area all time under boost. Also attached are some log extracts from a bigger log. In general max load barely pass 10.5ms.
Log1 --> http://i66.tinypic.com/fqu0g.jpg
Log2 --> http://i66.tinypic.com/2vxq03o.jpg
log3 --> http://i66.tinypic.com/2r5gcom.jpg
Then do you know or have seen that kind of behaviour before? What could cause it?