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Title: Throttle response issue of Turbo conversion (ME.1.5.5 / Z12XE) Post by: sureal on October 25, 2020, 10:59:20 PM Hello ALL.
I do an experimental tuning that conversion a z12xe engine from N.A. to Turbo. Then I remap the original ecu. (fuel, ignition, or airmass limiter) Seems everything is okay and run smooth (AFR is well range, no knock) But I meet it seems got some kind of unknown control about throttle response. - If I drive high speed for a while (over 60mph), throttle response will be quicker than original and boost spool up quicker. (and make a higher boost around +0.2~0.25bar than orignal) - If I drive back to normally (under 60mph) for a while, throttle response will back to normal. I use AEM boost controller and set fixed duty rate to wastegate. Originally I just think that's mechanical problem, like wastegate spring will soft/harder after warm up. But It seems change between some related to loading/speed. I try to tune KFWDKMSN/KFMSNWDK to figure out relationship between boost and throttle angle. If I tune up WDKMSN/MSNWDK, boost will higher than original, but just let me know that throttle influence to boost value. Just do not know what make difference or there is something control throttle/driver request related velocity or another factor. |