timming?
- Thread starter joeytvr
- Start date
joeytvr said:
Probably not a very good idea... from what I understand the knock sensor is how the system knows where to adjust its timing for optimal performance (i.e. roll the timing forward until it detects knock, then back it off a hair).
If you were to bypass it, the system would see it as a fault and stick with the "default" timing, robbing you of a lot of juice... or worse if you bypassed in a way where it always registered as ok (not sure if that's possible or not), you could do some damage as the egine couldn't detect knock and back itself off... correct me if I'm wrong here guys!
Are you getting a knock sensor code? If so, the ECU retards timing a max of 10 deg. If the knock sensors are disconnected, a code 52 is generated and will cause the timing to retard...there is no way to easily get around this that I know of.
The knock sensors "listen" for a 7 khz frequency. The info I have is not specific, but for "strong" knock it pulls timing "a lot"...for weak knock it pulls timing "a little". However, there is an ECU minimum advance angle based on initial timing + basic advance + corrective advance/retard. The minimum is -10 deg to 0 deg. Based on this, I would say the max your knock sensors could cause timing to retard is 10 deg. Keep in mind this is cumulative...the other corrective advance/retard values the ECU looks at also have an effect.
The knock sensors "listen" for a 7 khz frequency. The info I have is not specific, but for "strong" knock it pulls timing "a lot"...for weak knock it pulls timing "a little". However, there is an ECU minimum advance angle based on initial timing + basic advance + corrective advance/retard. The minimum is -10 deg to 0 deg. Based on this, I would say the max your knock sensors could cause timing to retard is 10 deg. Keep in mind this is cumulative...the other corrective advance/retard values the ECU looks at also have an effect.
no engine codes at all. Car runs great. However after full boost builds in second and higher gears power starts to fall off around 5000 rpms. Air fuel ratios are good. Although I have to pull some additional fuel at these higher rpms. Another thing that makes me think its pulling timming
Check your coolant temps...over 210 deg the ECU will also pull timing. It's one of those corrections I mentioned above 
When was your last tune up condition of plugs and wires? Can you blow throw your BOV? What are yourr mods? How much boost are you running? Check for boost leaks......
Start with the simple with stuff.
Start with the simple with stuff.
I doubt you are have an issue with the knock sensor or the ecu. Check your sparkplug gap..... knock it down to about 28. What brand plugs and wires? NGK is the only way
