A friend introduced me to a toyota seg owner who wants to tune his e-manage.This is my first time dyno tune an auto 20v,it is quite difficult as it need delicate control of the throttle in order to maintain the car in particular gear,hence it is hard to get consistency on every runs.
None the less,the base run made is quite good and it is very hard for me to squeeze the every bit of extra power and torque.I got it after almost 30 runs,but there is a strange torque dip at 3500 up to 4500,i spend another 47 runs just to tuneout the dip but after using all tricks up my sleeve,still couldnt get it to better.I guessing this is something that can only be resolved on the street,as this car is auto transmission,and dyno loading can't simulate some of the load the gearbox experienced on the actual road driving conditions.
The AFR lean out just at that moment,i'm thinking it caused by vvt switching on.Something we couldnt see on dyno,a further street tuning should resolve the issue.However,there is an increase on torque right after 4500 up all the way to redline,is much flatter.Peak HP increase is quite minimal and happens a bit later than previous,but it still climbing up until 7600rpm,almost at the rev cut and shift point for the autobox.
I want to review this back and find ways to improve the torque curve and AFR lean out issue at low rpm,will be fine tuning on the road.But anyway,owner now happy with current performance.
