orginal yaris 2005 1,5 turbo 150hk

[CASTREX]

Originally Posted by mrloseth

yesturday i did messure my wideband..the results: started att 1500rpm on 5gear messurements: 1700rpm 13,0....1900rpm 13,3....2300rpm 13,4....2500rpm 13,7...... 2700rpm 13,9..... 2800rpm.14,0....3000rpm-13,5...3200rpm 12,0... 3500rpm 11.8.... 3800rpm-10.7...4000-6200 rpm 10,0

castrex : what do think? this messure are with stock boost.
i think maybe it a bit lean att 2800 rpm?
what would hapen if i bouild exhaust?

im going to do an new messure today and see if i do get the same

These numbers don't tell much unless you can add the boost figures also. It does a bit lean at 2800 as you said if you are indeed boosting at that RPMS.

It does also look quite rich at the top end... if you could lean that out you will gain some power up top.

How many psi are you seeing at 2500/2800 rpm?

Overall it doesn't look bad. You have enough fuel obviously. Some fine tuning would help. Why don't you try getting a SAFC or a greddy emange? You should be fine if you build a full exhaust.