rollex Member 683 Member For: 10y 6m 10d Gender: Male Location: Australia Posted 02/10/14 07:59 AM Share Posted 02/10/14 07:59 AM How good is the stadard knock detection, eg if my car has been tuned for 98 and I put 91 in it and it starts pinging hard, will the ECU pull back timing sufficiently to save the motor? Or does it simply put it in limp mode?What about if my fuel pump starts to fail and it pings it's tits off, will it save the motor and put it in limp mode, or does it have a maximum amount of timing it can pull back and if it still detonates after it has done this it will just blow it self up?What about with an XCAL SCT4, does this just utilise the stock knock detection, or does it implement something new, if so how does it work?Looking for any information at all.Thanks guys Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 6m 21d Gender: Male Location: @ my laptop Posted 02/10/14 10:51 AM Share Posted 02/10/14 10:51 AM knock detection depends on how many degrees of retard the tuner has allowed, it will not go into limp mode if it exceeds this amount and still pings, it will go into ventilated block mode 4 Link to comment Share on other sites More sharing options...
JVK Silver Donating Members 751 Member For: 19y Gender: Male Location: North West Hot Hell,VIC Posted 02/10/14 11:12 AM Share Posted 02/10/14 11:12 AM Very well put Mick. 2 Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 6m 17d Gender: Male Location: Adelaide Posted 02/10/14 11:32 AM Share Posted 02/10/14 11:32 AM Yes u can blow up a stock donk if that's what your asking But the ecu will try its hardest to save it Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 2m 25d Gender: Male Location: Perth Posted 02/10/14 11:48 AM Share Posted 02/10/14 11:48 AM Knock knock...... Who's there.......?? Rod! Link to comment Share on other sites More sharing options...
.Stripes. All stock bar the k&n panel filter Silver Donating Members 8,061 Member For: 12y 9m 5d Gender: Male Location: Perth Posted 02/10/14 12:32 PM Share Posted 02/10/14 12:32 PM 2 Link to comment Share on other sites More sharing options...
rollex Member 683 Member For: 10y 6m 10d Gender: Male Location: Australia Posted 02/10/14 12:43 PM Author Share Posted 02/10/14 12:43 PM knock detection depends on how many degrees of retard the tuner has allowed, it will not go into limp mode if it exceeds this amount and still pings, it will go into ventilated block modeCould you explain in more detail?It sounds like you set a knock retard degree limit, once it passes the knock retard limit if it is still knocking it will literally vent the block via a conrod punching a hole?By default what is this knock degree retard limit set at, 1,2,5,10 ?When is limp mode reached, what is required to go there aside from complete sensor failure, is knock ever considered a condition to go into limp mode? Link to comment Share on other sites More sharing options...
rollex Member 683 Member For: 10y 6m 10d Gender: Male Location: Australia Posted 02/10/14 01:03 PM Author Share Posted 02/10/14 01:03 PM (edited) I don't understand why there would be a limit, surely if it keeps knocking the ECU would be more than capable of going "GOTO: sh*t bricks mode" where it pulls timing and fuel completely so you can't rev over 2k.If I ever designed an ECU that is what I'd do anyway. Edited 02/10/14 01:03 PM by rollex Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 2m 25d Gender: Male Location: Perth Posted 02/10/14 01:20 PM Share Posted 02/10/14 01:20 PM Excessive spark retard generates a lot of heat and can be as harmful as knock. Basic spark retard tables from a BF F6. 2 Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 6m 17d Gender: Male Location: Adelaide Posted 02/10/14 08:49 PM Share Posted 02/10/14 08:49 PM Iam a unitard Link to comment Share on other sites More sharing options...
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