Yeah I think you were a little mixed on your numbers
...From what I've heard 1deg = 2hp and 10hp = recognized as the edge of "felt".
But I want to focus on this statement:
Originally Posted by willwren
If knock wasn't bad for our engines, why would the PCM retard timing to prevent it? And why is 91 octane fuel REQUIRED by the manufacturer? Why does higher octane help prevent KR?
I think this is why this debate is getting nowhere. You're not even on the same page. NOBODY SAYS DETONATION IS GOOD!!!!!!! NOBODY SAYS DETONATION IS OK!!!!!!
Please read that several times if need be. I keep saying this isn't about performance, gas mileage, or if detonation is a good thing.
DETONATION IS BAD!!!
Bad bad bad
That out of the way, for the 400th time...
The neat thing is our cars are equipped with whats called a "Knock sensor" which can detect and with the PCM retard the timing in an EXTREMELY short time. This saves our cars from potential damage. Thus you have NO MORE detonation and no more foul effects from detonation. No detonation = No damage ...see where I'm going?
What you ARE left with is lower performance and gas mileage but it will not damage your engine.
The second sentence was answered like 40 posts ago..here:
GreenMachine - "I agree with DrJay on this one. I have the original owners manual, and it states that 91 or above is recommended, but that 87 can be used, but it will affect acceleration. It also says that a light pinging when under heavy load is normal, but a heavy knocking is bad. This is right out of the owners manual. "
It seems like I've read the same thing before in mine but its MIA right now...Maybe you can read it in yours and tell us what it says?
3rd sentence - Now you're just backtracking...I get why you're asking this but I believe we're all past the point of needing to answer it.
Oh and on a side note ZZperformance seems to think the PCM is capable of retarding timing as much as 25.5degrees. So with our little experiment earlier you could run 24deg at idle and 11deg at WOT on 92. The PCM is capable of taking 59.5deg from the idle and 36.5deg from WOT....Have any of you changed the timing on a distributor based engine? You know how much even 2-3degrees makes. This simply illustrates that the PCM is MORE than capable of dealing with detonation before its a problem.
I don't get how this is even a debate? All anyone keeps saying is how it affects performance, gas mileage, and "you should buy it because you bought the car."
Meanwhile back in the real world the computer can pull up to nearly 60degrees of timing in efforts to combat detonation. If you have detonation after that you've got a tank full of 5octane fuel.