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Evo X Engine Management / Tuning Forums Discuss the major engine management systems.

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Old Feb 18, 2010, 01:09 AM   #1
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cobb ap knock retard ?

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?
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Old Feb 18, 2010, 07:14 AM   #2
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Ouch! Thats a lot of knock! 1.0=3 counts so yeah man knocking bad. Do you have a WB installed? and have ATR?
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Old Feb 18, 2010, 08:38 AM   #3
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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
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Old Feb 18, 2010, 09:12 AM   #4
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Formula is

Cobb number / .35 = knock count.
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Old Feb 18, 2010, 09:26 AM   #5
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?? 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
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Old Feb 18, 2010, 09:45 AM   #6
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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.
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Old Feb 18, 2010, 11:35 AM   #7
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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?
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Old Feb 18, 2010, 12:28 PM   #8
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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)
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Old Feb 18, 2010, 02:55 PM   #9
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Quote:
Originally Posted by Golden View Post
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.
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Old Feb 18, 2010, 03:22 PM   #10
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Question

Quote:
Originally Posted by Golden View Post
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.
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Old Feb 18, 2010, 03:25 PM   #11
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If its all time yes! If its sometimes there and sometimes not then no.
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Old Feb 18, 2010, 03:31 PM   #12
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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?
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Old Feb 18, 2010, 03:37 PM   #13
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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.
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ETS intake, ETS DP Open dump Ecuflash, Evoscan, Self tuned it now for my X (Thanks to the help of people on this forum) LC-1 Wideband, UR UICP,LICP and Garrett 4.5 IC, Perrin 3 Port, Forge WG, Forge BOV
(on the way), 20% tent and Rally Armor flaps all installs done by me and tuned by me.
78 Corvette 406sbc 175 shot.
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Old Feb 18, 2010, 03:43 PM   #14
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def. check that relay first.
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Old Feb 18, 2010, 07:40 PM   #15
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Cobb says that 1.05 and less is normal as long as its random. Some say its almost impossible to tune them all out.
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Old Feb 18, 2010, 07:40 PM
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035, ap, bad, cobb, count, counts, engine, ets, evo, intake, knock, logging, lot, pull, retard

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