Question about Detonation/spark knock

[thenek]

Last night i took the L to the track and ran a 13.06 in 85* humid weather. Towards the end of the quarter between 90-110 mph i heard detonation sounding like spark knock, like a ticking noise on 2 different runs. At idle, normal driving and even getting on it, i don't hear the spark knock till i hit that speed range. My L has already ate the tip off of a Tr-6 in cylinder #5 about 2 months ago, and i have pulled that plug out serveral times checking to make sure it did't happen again. The #5 plug is fine and when i pulled 3 other random plugs out 2 months ago, when i found the ate up #5 plug, they looked fine.

 

[thenek]

I'm just wondering if the stock coil packs or injectors are known for having problems. I had the truck dyno tuned almost a year ago and havent added anything to the truck since then. I'm taking it to my tuner asap. I really don't want to blow my motor and im tying to figure out if its the tune, coil pack, injectors or what that might be causing this. I run 93 octane and it is tuned for it. My other mods are listed below. Any suggestions/feedback is greatly appreciated.

 

[thenek]

03 Sonic Blue Lightning
400 rwhp/500rwtq
1/4 13.06@103mph
AEM Brute Force CAI
Accufab Single Blade TB
C&L Upper Intake Plenum
6# SC Crank Pulley
Excalibrator 2 Dyno Tuned
NGK TR6 Plugs
Flowmaster 40 Series Muffler
305/45/18 Nitto DRs
Traction bars on the way

Sorry but for some reason the forum wouldn't take all this as one post

 

[thenek]

Well i went to my tuner and he made a tune to drop my timing from 19 to 17 and said i should try running 94 octane. Has anyone had any problems with the stock coil packs or injectors? i'm pretty sure you don't need the 60# injectors until your pushin 500rwhp.

 

[Fade 2 Black]

The problem was the amount of spark you had. You can't run 19* on pump gas even if it's 93 octane. You'd need 96 oct. MINIMUM IMO. COP going bad doesn't cause detonation, an injector could but is unlikely.

 

[thenek]

The truck has run with this tune for almost a year now with no problems. That tells me it works fine at 19* on pump gas. Im begining to think some of the stations i fill up at might be selling a "watered down" 93 octane. The reason i suspected the Coil packs or the injectors was mainly because the tip of #5 plug was chewed off and maybe somthing similar was happening in a diffent cylinder ie. too much spark/gas or not enough.

 

[03SNOWBALL]

Hey whats up man I never did ask you what your screen name was on here I started a thread here thanking you for the T-bars.Congrats on that run.I thought that you were on 17* timing.Thats what im running atleast thats what I was told.Did you get your tune changed?Here's your victory
Racing the Lightnings on a Hot n humid day both have almost the same mods.

 

[thenek]

I remember calling him and asking him before what my timing was and he told me 18* and yesturday he looked at the logs and told me 19*. So, not sure why im getting different answers unless he jus missed somthing the first time but he jus took the existing tune and took 2* off so i jus need to reflash it and see if the knock goes away.

We will have to make another vid soon. One where you get a good take off. Your truck is as fast as mine. I looked up the thread you started about the traction bars and replied. lol When are we having the Lightning get together/barbeque? I'll bring the beers.

 

[big nasty]

When was the last time you changed the fuel filter? That may be part of it or cheap gas.