low load knock after GSC S1 cams
#17
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You may have been getting some misfire noise which the knock sensor records as knock though it is technically something entirely different.
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abnt89 (Oct 20, 2017)
#21
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In the case of our cars the "phantom knock" can be attributed to drive train noise that is being picked up by the over sensitive knock sensor. Thus, if we desensitize it a bit by raising the knock multiplier tables we can effectively eliminate phantom knock.
True engine knock will set off the knock sensor like crazy. It will have huge spikes in voltage. While phantom knock will result in minor jumps in voltage that cross the knock threshold. I did these tests on my own car and the stock ecu. That is all I am trying to say.
True engine knock will set off the knock sensor like crazy. It will have huge spikes in voltage. While phantom knock will result in minor jumps in voltage that cross the knock threshold. I did these tests on my own car and the stock ecu. That is all I am trying to say.
#23
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I used to always have sporadic knock on spoolup and here and there throughout the rev range on boost, turns out it was my boost solenoid clicking triggering it. Didn't help that it was resting against the intake manifold either.
#26
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Ziad,did you end up sorting this out?
I just had some GSC S1 cams installed also and i'm now seeing 36 knock count even at 25% throttle around 2500 to 3500ish rpm and 80-100 load. Pulling timing, adding fuel hasn't helped at all for me. I do have upgraded beehive springs, and the lifter were bleed. Doing a pull from 4000 rpm show no knock at all...
I just had some GSC S1 cams installed also and i'm now seeing 36 knock count even at 25% throttle around 2500 to 3500ish rpm and 80-100 load. Pulling timing, adding fuel hasn't helped at all for me. I do have upgraded beehive springs, and the lifter were bleed. Doing a pull from 4000 rpm show no knock at all...
#27
mate.. u what fixed the issue... increasing timing.... i have no idea why. put it back to stock.. increased a little and there u go almost no knock... on stock knock tables... even on the sd rom no problem... pity i am going to crappy fuel and hence decreasing timing which causes knock.
btw i was never 36... but it would quickly jump to 18or so.
also atleast on my car i have noticed it i cant put much timing above 5.5k rpm, maybe the cams for 8mr and 8gsr are supposed to be different??
btw i was never 36... but it would quickly jump to 18or so.
also atleast on my car i have noticed it i cant put much timing above 5.5k rpm, maybe the cams for 8mr and 8gsr are supposed to be different??
#28
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Well I tried going back to the stock timing maps, tried less timing, and more timing and had no luck fixing it. I've had my local workshop use some det cans to confirm there's no knock but didn't want to touch the knock tables unless it was the last resort...
I have made some small changes to the load, low and mid multipliers to prevent knocksum coming up, which has fixed the problem.
My timing is conservative at the moment... now the low load knock is sorted I should have the tune finished soon. Will be interesting to compare to yours as the next planned mod for me is a bbk lite.
I have made some small changes to the load, low and mid multipliers to prevent knocksum coming up, which has fixed the problem.
My timing is conservative at the moment... now the low load knock is sorted I should have the tune finished soon. Will be interesting to compare to yours as the next planned mod for me is a bbk lite.
#29
yeah the load KC tables looked like mine... i used the united 100 ron so it helps. now that i am back with 95ron its a pain. as a lot of strange knock comes back up. as someone said maybe u need to turn the knock control off. use det cans to tune and then turn on again and adjust till u get no knock again.
btw who is ur tuner
btw who is ur tuner
#30
yeah the load KC tables looked like mine... i used the united 100 ron so it helps. now that i am back with 95ron its a pain. as a lot of strange knock comes back up. as someone said maybe u need to turn the knock control off. use det cans to tune and then turn on again and adjust till u get no knock again.
btw who is ur tuner
btw who is ur tuner
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