Thread: Thinking of converting to E85.. Yes or Ne??

http://www.britannica.com/EBchecked/...20471/knocking

Originally Posted by MoarkatsINmuhtrailer

The sensor picks it up and tells the pcm to back the **** up...So yes, it is real knock. There is a problem, in this case, the downpipe and swaybar hitting eachother. Fix that, the knock goes away.

Do you mean Knock Retard or actual Knocking occuring in the engine?

The KR is always real because Knock retard is the retarding of the timing that is occurring due to the PCM picking up what it believes is knock from the knock sensors. It doesn't matter what is causing it to pull the timing. If the PCM is pulling timing and reporting KR, the KR is real.

The cause for the KR can be false, as in the knock signal can be falsified.

Unless you guys have a different defintion of KR from say the GM service manual or the HPT manual.

Originally Posted by matt5112

Do you mean Knock Retard or actual Knocking occuring in the engine?

The KR is always real because Knock retard is the retarding of the timing that is occurring due to the PCM picking up what it believes is knock from the knock sensors. It doesn't matter what is causing it to pull the timing. If the PCM is pulling timing and reporting KR, the KR is real.

The cause for the KR can be false, as in the knock signal can be falsified.

Unless you guys have a different defintion of KR from say the GM service manual or the HPT manual.

"These pressure waves force parts of the engine to vibrate, which produces an audible knock."

No where does it mention external factors that can cause the engine to vibrate or produce audible knock EX. metal against sway bar, exhaust hitting ect.

Regardless of where the knock is being picked up all that stupid computer cares about is that it can detect it.

Originally Posted by MoarkatsINmuhtrailer

Matt yes, that is what I mean

What you said wasn't at all what you meant then.
Glad you agree with me.

Originally Posted by 98GrandPrixIraqVet

"These pressure waves force parts of the engine to vibrate, which produces an audible knock."

No where does it mention external factors that can cause the engine to vibrate or produce audible knock EX. metal against sway bar, exhaust hitting ect.

so umm go fish???

Exactly... because that isn't knock! It's false knock! Lol

It sure in the hell is if the computer detects it and "believes it to be real knock" computers cannot guess things, its all 1 and 0's yes or no, real or not.

All that matters is that its being detected why is it so hard for you to grasp it doesn't matter if its internal or external??

Originally Posted by 98GrandPrixIraqVet

It sure in the hell is if the computer detects it and "believes it to be real knock" computers cannot guess things, its all 1 and 0's yes or no, real or not.

All that matters is that its being detected why is it so hard for you to grasp it doesn't matter if its internal or external??

I'm just gonna leave this here.
Gnite!

zzzzzzzzzzzzzzz

Originally Posted by gtpsleeper

I think the argument now is 2 sides of the same coin...

Youre both arguing 2 different things but are making the same point lol...

Yup its been like that since page 1 glad someone can sift through the bullsh1t

Because computers don't have glitches, right?

Originally Posted by crbquist

I like it so far, although my gas mileage has gone from "decent" to "crap". The car definitely feels like it pulls harder, however I really need to drop a couple pulley sizes to really take advantage of the stuff. I'm still rocking a 3.0 for now.

Yeah you will get a couple mpgs less with e85 but with the fuel costing less it evens out. Post up when you drop that pulley and let us know how it goes. I'm trying to decide what to do next on my car because the trans should really be next but I really want to port the blower and get a N*. The trans is fine now but I know adding all this power will kill it. I'll do both eventually but can realistically only do one or the other this winter... You are on a stock trans too right?

the PCM actually doesnt detect knock as much as the ICM does. The PCM interprets knock signal as filtered by the ICM. Case learn status and crank/cam trigger noise will generate more "false knock" than a header/downpipe ever could.

Hmmmm interesting. How so I dont get that^^^^^^^

Originally Posted by crbquist

Yessir, stock trans and still doing just dandy. I'm going to start piecing stuff together for a new trans because I know one day the stocker is going to go boom. I'm on borrowed time lol. I wouldn't waste your time and possibly $$ porting a gen 3. Just get a gen 5 and be done with it. You'll thank me later


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I'd like a GenV but I've two Gen3's in my garage and they are worth crap anymore to sell so I'll just port one of them and live with a little less efficient blower I guess.