Standard Knock Detection, How Good Is It?

[rollex]

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

[ratter]

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

[JVK]

Very well put Mick.

[JETURBO]

Yes u can blow up a stock donk if that's what your asking

But the ecu will try its hardest to save it

[Ralph Wiggum]

Knock knock...... Who's there.......??

Rod!

[.Stripes.]

[rollex]

  On 02/10/2014 at 10:51 AM, ratter said:

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

Could 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?

[rollex]

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

[Ralph Wiggum]

Excessive spark retard generates a lot of heat and can be as harmful as knock.

Basic spark retard tables from a BF F6.

[JETURBO]

Iam a unitard