Shift Knock w/ UTEC - How many compensate for it?
Shift Knock w/ UTEC - How many compensate for it?
Real quick question...
How many of you changed the timing from "ECU" to a real low number for 5,000+ RPM in the 0% column in order to prevent shift knock? The map that came on my UTEC from the previous owner (tuned to PF) had ECU all of the way down.
I seem to be getting some, although it has been at a time when I wasn't logging. It just dogged real bad right after shifting. And I did experience it before when I was logging, but I adjusted my TPS threshold for open loop to 0 or something (was a very short time frame where i was under the threshold and still in boost upon let-off) and it seemed to fix it.
How many of you changed the timing from "ECU" to a real low number for 5,000+ RPM in the 0% column in order to prevent shift knock? The map that came on my UTEC from the previous owner (tuned to PF) had ECU all of the way down.
I seem to be getting some, although it has been at a time when I wasn't logging. It just dogged real bad right after shifting. And I did experience it before when I was logging, but I adjusted my TPS threshold for open loop to 0 or something (was a very short time frame where i was under the threshold and still in boost upon let-off) and it seemed to fix it.
here..
https://my350z.com/forum/showthread....ec+shift+knock
https://my350z.com/forum/showthread....ec+shift+knock
Originally Posted by chefrey
i have actually figured this whole shift knock thing out tonight and have started this thread to help anyone else with the same problem since it sees to affect quite a few people.
it was really simple and i cant believe none of the big time tuners on these boards chimed in with this.
you simply (at least in my case) have to tune the 0% column in the timing and fuel map above 5000 rpms. in open loop fueling the 0% column is controlled by the ecu when you recieve your utec. that laod column can still be tuned by user defined values. since the ecu is taking over at 0% load when you lift to shift it is adjusting the timing way to high.
i simply matched the 0% load to the 10% load columns timing values instead of it reading ecu it is now in line with the rest of the timing that the utec runs so there is no advance in timing thus no knock. i also tuned the 0% column in the fuel map by just adding a little fuel above 5000 rpms to add a little extra support.
this will not affect daily driving at all since there is no chance of the ecu being in controll over 5000 rpms, except when lifting to shift, because your set parameters have the utec in controll above 2000rpms and 25% throttle and there is no way to reach 5000 rpms with out going over 25% throttle.
i made these adjust and made several pulls through all gears making hard shifts and did not get shift knock at all!!! problem solved, there is no need to adjust knock thresholds or sensitivity at all.
while researching i found this guide to tuning utecs, it was written by a wrx tuner but many things transelate to us 350z guys including what i have stated above. it is a good read for all self tuners especially beginners.
here is the link http://www.scribd.com/doc/6848/UTEC-...tes-03-22-2004
it was really simple and i cant believe none of the big time tuners on these boards chimed in with this.
you simply (at least in my case) have to tune the 0% column in the timing and fuel map above 5000 rpms. in open loop fueling the 0% column is controlled by the ecu when you recieve your utec. that laod column can still be tuned by user defined values. since the ecu is taking over at 0% load when you lift to shift it is adjusting the timing way to high.
i simply matched the 0% load to the 10% load columns timing values instead of it reading ecu it is now in line with the rest of the timing that the utec runs so there is no advance in timing thus no knock. i also tuned the 0% column in the fuel map by just adding a little fuel above 5000 rpms to add a little extra support.
this will not affect daily driving at all since there is no chance of the ecu being in controll over 5000 rpms, except when lifting to shift, because your set parameters have the utec in controll above 2000rpms and 25% throttle and there is no way to reach 5000 rpms with out going over 25% throttle.
i made these adjust and made several pulls through all gears making hard shifts and did not get shift knock at all!!! problem solved, there is no need to adjust knock thresholds or sensitivity at all.
while researching i found this guide to tuning utecs, it was written by a wrx tuner but many things transelate to us 350z guys including what i have stated above. it is a good read for all self tuners especially beginners.
here is the link http://www.scribd.com/doc/6848/UTEC-...tes-03-22-2004
I'm pretty sure that the 0% column is still just an offset of the stock ecu. you aren't able to set absolute timing in the 0% column.
it may work for the wrx crowd, but those guys aren't tuning the saem way as the 350Z FI guys. The wrx guys can still use the MAF for tuning. We have to use the open loop tuning to bypass the Stock MAF/ECU.
changing the timing in the 0% column may work, but you're going to have to use the offsets of stock timing.
it may work for the wrx crowd, but those guys aren't tuning the saem way as the 350Z FI guys. The wrx guys can still use the MAF for tuning. We have to use the open loop tuning to bypass the Stock MAF/ECU.
changing the timing in the 0% column may work, but you're going to have to use the offsets of stock timing.
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