Why is it reading knock so high?

[supermanvick]

When i start up my car my S-AFC II will read a knock of 50 then slowly rise to about 190 can anyone tell me what the problem is. Im running 550cc injectors on a small 16g and thats pretty much it.

 

[GSX93DSM]

I suggest you get a fuel pump to help with what upgrades you got. What is all your other settings at?

 

[supermanvick]

Hi 80% Low 30%

Hi Throttle table -10%
Low Throttle table 0%
is that waht you mean and it also ran fine yesterday and now its reading that stupid knock and not boosting right!

 

[GSX93DSM]

First of all how much boost are you running. I would run about 10spi until you get the proper fuel. Depending on fuel it can cause knock problems. If you said it ran fine before and its not now, you have a problem. How long have you been running your setup?

 

[andytalon]

Do Safc's even read knock on our cars???? I know mine doesn't is this new...WTF

 

[JayRolla]

No, SAFC2 knock sensor feature is not accurate on our cars at all. Do not use or trust it at all. Get a data logger to tune with.

 

[Rex2342]

Disconnect the knock wire on the AFC completely too. I've heard if it's hooked up it can affect the way the ecu reads knock sums and possibly damage the engine. If the ECU is getting inaccurate knock sums the timing will be off and it could cause detonation.

 

[MrGriff750]

Sometimes a faulty knock sensor can cause lots of random knock.