KNOCK?
#1
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KNOCK?
hi , just had an apexi power fc ecu fittted and i dont know how to use it properly, its on the 4 channel setting with knock and its quite regularly reading 10 mmhs i think, can anyone tell me just how bad this is, (is engine fukced or can it be rebuilt ect) any info very welcome....
...cheers dan
...cheers dan
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knock of 10 is nothing.. the ecu should have been set up to flash the engine light if genuine knock is detected
I have a small user guide on my website www.jollygreenmonster.co.uk under the "help pages" hope that helps
Simon
I have a small user guide on my website www.jollygreenmonster.co.uk under the "help pages" hope that helps
Simon
#6
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Yeah, as JGM says, 10 is nothing to worry about.
Mine, as yet, has failed to get past 20 when giving it the beans (under normal driving it doesn't get beyond single figures).
However, there's an issue with mine in that the 'det threshold' CEL light flashes... even though it shows a lowly knock reading of c.19 or less.
Each mapped engine is obviously unique, but the early v.1/2 motors start to properly knock - i.e. potential engine-destroying detonation - between around the 30-40+ mark I think. However, not sure of the v.3 engine's ballpark.
Mine, as yet, has failed to get past 20 when giving it the beans (under normal driving it doesn't get beyond single figures).
However, there's an issue with mine in that the 'det threshold' CEL light flashes... even though it shows a lowly knock reading of c.19 or less.
Each mapped engine is obviously unique, but the early v.1/2 motors start to properly knock - i.e. potential engine-destroying detonation - between around the 30-40+ mark I think. However, not sure of the v.3 engine's ballpark.
Last edited by joz8968; 23 July 2009 at 07:35 PM.
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general rule of thumb being -
v1~2 - 30-40
v3~4 - 20~30
v5~6 - 10~20
in normal full rev range driving.
forged pistons depending on clearances can increase that and every engine varies
Simon
v1~2 - 30-40
v3~4 - 20~30
v5~6 - 10~20
in normal full rev range driving.
forged pistons depending on clearances can increase that and every engine varies
Simon
#12
The Power FC is still on base map, some say the base map is very aggressive though APEXi claims it is tuned to 92 octane. How worried should I be?
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no not really.. the standard ecu pulls timing if it hears knock.. the powerfc doesn't.
If you go to SETTINGS --> IGN/INJ and set the IGN to -5 you will remove 4degrees timing from the whole map.. but it will only do that until you turn the ignition off.. then it shouldn't in theory be detting and the highest knock reading then is just engine noise.
Then try it at -4, -3 etc until the knock readings increase.. if they do then it is detting, if they don't and remain the same then it should be okay det wise..
Is the car standard?
47 is a bit high.. 22 more like normal
Simon
If you go to SETTINGS --> IGN/INJ and set the IGN to -5 you will remove 4degrees timing from the whole map.. but it will only do that until you turn the ignition off.. then it shouldn't in theory be detting and the highest knock reading then is just engine noise.
Then try it at -4, -3 etc until the knock readings increase.. if they do then it is detting, if they don't and remain the same then it should be okay det wise..
Is the car standard?
47 is a bit high.. 22 more like normal
Simon
#17
no not really.. the standard ecu pulls timing if it hears knock.. the powerfc doesn't.
If you go to SETTINGS --> IGN/INJ and set the IGN to -5 you will remove 4degrees timing from the whole map.. but it will only do that until you turn the ignition off.. then it shouldn't in theory be detting and the highest knock reading then is just engine noise.
Then try it at -4, -3 etc until the knock readings increase.. if they do then it is detting, if they don't and remain the same then it should be okay det wise..
Is the car standard?
47 is a bit high.. 22 more like normal
Simon
If you go to SETTINGS --> IGN/INJ and set the IGN to -5 you will remove 4degrees timing from the whole map.. but it will only do that until you turn the ignition off.. then it shouldn't in theory be detting and the highest knock reading then is just engine noise.
Then try it at -4, -3 etc until the knock readings increase.. if they do then it is detting, if they don't and remain the same then it should be okay det wise..
Is the car standard?
47 is a bit high.. 22 more like normal
Simon
Clearly it doesn't feel quite as good as on base map(but still better than the stock ECU). Probably due to the reduction in timing. Any advice on how to get back that feeling while still keeping her safe. I'm at such a limitation living so far from the UK.
How do I actually save this setting though as opposed to it always being erased after I turn the car off??
Last edited by Nemesis_911; 01 October 2009 at 05:29 AM.
#18
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- Press 'NEXT' immediately after making the change, or...
- After making the change, then come back out of that parameter using the 'PREV' button (but whilst still in the "Ign/Inj" menu)... and then press 'NEXT'.
'NEXT' acts as a 'save' parameter function (to the non-volatile memory), too.
Last edited by joz8968; 01 October 2009 at 12:26 PM.
#19
From memory, you either:-
- Press 'NEXT' immediately after making the change, or...
- After making the change, then come back out of that parameter using the 'PREV' button (but whilst still in the "Ign/Inj" menu)... and then press 'NEXT'.
'NEXT' acts as a 'save' parameter function (to the non-volatile memory), too.
- Press 'NEXT' immediately after making the change, or...
- After making the change, then come back out of that parameter using the 'PREV' button (but whilst still in the "Ign/Inj" menu)... and then press 'NEXT'.
'NEXT' acts as a 'save' parameter function (to the non-volatile memory), too.
#23
Hopefully... I've been reading this very long FAQ. There is a way to save it but I'd rather be told by somebody that tunes Imprezas rather than guesstimate from an FAQ made by a GTR owner.
The strangest thing happened today. I did a resonator delete, and whereas the car pulled better with the improved air flow. With the A/C on it gave me some pretty high knock readings at -3, We're talking like 80 and so on in mid to high RPM in 3rd. I then tried a retardation of -5 and it seemed to help.
It's just so weird because I made a few pulls after the delete without A/C (clearly) and the knock was around 20 at -3. Which was within Simon's determined safe range and probably expected with the increased air flow now and higher daytime temperatures.
Really hope somebody can help.
The strangest thing happened today. I did a resonator delete, and whereas the car pulled better with the improved air flow. With the A/C on it gave me some pretty high knock readings at -3, We're talking like 80 and so on in mid to high RPM in 3rd. I then tried a retardation of -5 and it seemed to help.
It's just so weird because I made a few pulls after the delete without A/C (clearly) and the knock was around 20 at -3. Which was within Simon's determined safe range and probably expected with the increased air flow now and higher daytime temperatures.
Really hope somebody can help.
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If you have saved the changes already then they should be saved, for example timing in a certain row/column is 14, you do the global pull of -3 and save it, it will now be 11. Turn the car off and on and will now be 11, but if you go to the global ign screen it will say 0, but 0 relative to the map, which is noe 11, not 14 anymore.
#26
From memory, you either:-
- Press 'NEXT' immediately after making the change, or...
- After making the change, then come back out of that parameter using the 'PREV' button (but whilst still in the "Ign/Inj" menu)... and then press 'NEXT'.
'NEXT' acts as a 'save' parameter function (to the non-volatile memory), too.
- Press 'NEXT' immediately after making the change, or...
- After making the change, then come back out of that parameter using the 'PREV' button (but whilst still in the "Ign/Inj" menu)... and then press 'NEXT'.
'NEXT' acts as a 'save' parameter function (to the non-volatile memory), too.
Yes it will always do that, but that is to the values that are in the map.
If you have saved the changes already then they should be saved, for example timing in a certain row/column is 14, you do the global pull of -3 and save it, it will now be 11. Turn the car off and on and will now be 11, but if you go to the global ign screen it will say 0, but 0 relative to the map, which is noe 11, not 14 anymore.
If you have saved the changes already then they should be saved, for example timing in a certain row/column is 14, you do the global pull of -3 and save it, it will now be 11. Turn the car off and on and will now be 11, but if you go to the global ign screen it will say 0, but 0 relative to the map, which is noe 11, not 14 anymore.
I was thinking about it the way you said it too Jay that maybe a change was being made and saved so then after restarting the car this would then become the 0 value.
Here's the FAQ being referred to though:
Apexi PowerFC FAQ
and here's the section that talks about adjusting the IGN/INJ values:
Apexi PowerFC FAQ
Cheers!
#27
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Hmmm thinking about it I'm not sure you can 'save' a global ign pull, I think you have to change every cell individually...
#29
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Nemesis, we've been a couple of ******** - we should both learn to read! !:-
So it will only be altered between the time it was changed with the engine running, until when the motor is shut down i.e. what you've been experiencing!
Originally Posted by Jolly Green Monster
If you go to SETTINGS --> IGN/INJ and set the IGN to -5 you will remove 4degrees timing from the whole map.. but it will only do that until you turn the ignition off
Last edited by joz8968; 02 October 2009 at 05:03 PM.
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Yes, I remember. Corner weighting didn't go as planned since both front adjustment collars had seized - but geometry was good - got me 4th in class at Scoobysprint the following weekend