cobb ap knock retard ?

[chewyobaca]

ok noob here......I just got a cobb ap and fired up stage 2. Well I went into live logging and went into "knock retard" and I'm getting a reading up to 2.4 at low rpms, but I did a few WOT and got one reading up to 1.8 and seeing a few pulls over 1.1......how bad is this and what can I do to fix issue? What else should I be looking for in my cobb ap live data logging?

[Whitewind]

Ouch! Thats a lot of knock! 1.0=3 counts so yeah man knocking bad. Do you have a WB installed? and have ATR?

[chewyobaca]

no wb or atr, I need to get that stuff soon. I thought I could run stage 2 with no big issues. Dang, well what can I do to make knock go away? I got 50/50 mix of 100 octane and 91 and that didn't seem to help much. I guess I'll go back to stage 1

[Golden]

Formula is

Cobb number / .35 = knock count.

[chewyobaca]

?? Cobbs number?? I called them and some guy on the phone didn't know anything and told me to go get it tuned.....lol that why I got the ap....but I guess you still have to pay for a tune, should of skipped this ap and just got a tune, what good is it tohave if you got to get TUNED still.....I can't believe this, is anyone else having lots of knock retard using ap stage 2 and if so WTF did you do to make it stp

[saytheb]

Switch to the AZ 91 octane stage 2 map. If that still doesn't work.. sorry to say but it's either use Stage 1 91 and fall back to stage 1 AZ 91, or get a pro tune.

[Whitewind]

Well if you don't know what your AFRs are I would check Fuel pump relay. Might be going bad. Could be to lean, bad gas, timing all kind of stuff. But I would change your fuel pump relay with headlight think it is and re-log. Find thread on here or look in your manual and see what one is the FP relay.

Also what year?

[Golden]

Sorry...

Formula is

Knock Retard (CA) / .35 = knock count

examples:
.35 = 1 knock count
1.05 = 3 knock count
2.46 = 7 knock count
12.66 = 36 knock count (I sure hope you don't see this one lol)

[saytheb]

Originally Posted by Golden

Sorry...

Formula is

Knock Retard (CA) / .35 = knock count

examples:
.35 = 1 knock count
1.05 = 3 knock count
2.46 = 7 knock count
12.66 = 36 knock count (I sure hope you don't see this one lol)

12.66 would sound like a Jamaican in your engine bay playing some steel drums.

[Hassan!]

Originally Posted by Golden

Sorry...

Formula is

Knock Retard (CA) / .35 = knock count

examples:
.35 = 1 knock count
1.05 = 3 knock count
2.46 = 7 knock count
12.66 = 36 knock count (I sure hope you don't see this one lol)

So i was getting .9 at the red line, Is it bad? ( I have over boost map from Cobb )
Thanks for sharing.

[Whitewind]

If its all time yes! If its sometimes there and sometimes not then no.

[steven88]

so whats an acceptable range of knock?

0.35 to 1.05 is fine for the most part? anything above that, you should look into diagnosis?

[Whitewind]

But if its at same rpm area and starts to knock .35 or whatever there is a problem in that area with timing or whatever. Lets say everytime you do a pull in 3rd or 4th and at 4500rpm you start seeing knock everytime there is a problem. Now if you do 3-4 pulls and 1 pull out of them there is knock at that rpm area your fine.

[DaveGSR]

def. check that relay first.

[Golden]

Cobb says that 1.05 and less is normal as long as its random. Some say its almost impossible to tune them all out.