Originally Posted by BillBoost37
As for Hans' comments. Many run 3.4 without KR or much KR. KR is Knock Retard, it means that the sensors see predetonation or false noise and they are removing some timing to compensate for the knock.
I've read several posts were people are getting more than 1 or 2 degrees of KR.
Take Gameover'* recent battle with KR
as an example, 3.4 with the necessary supporting mods, yes he still gets it.
If you want to run the 3.4 without KR, make sure you have a FWI/CAI thats functional.
Make sure your fuel injectors are good to go and match eachother. (I think this is the reason for the KR on my 93, but not 100% sure yet)
Make sure your fuel filter is fresh, one heat range colder plugs, and you have a non-plugged cat (High Flow is best)
If you are not worried about your motor just throw a pulley on.
If you care about your motor invest in a scantool, dont even think about mods without one. Even if you get the aeroforce version your fine but get something.
Like willwren mentioned (not directly) but if your Knock Sensors (there are 2 IIRC) fail or something else goes wrong, that knock can mean BOOM to your motor.
Detonation is VERY bad if it actually happens and the PCM cannot pull timing.
My advice is to start with a 3.5, if you have 0* of KR, then step down a size. not vise versa.