bigboymike68

Yesterday I was having my 06 SS tuned. everything was doing well, trans, DOD delete, top speed gov delete (yes it was set at 140 from the factory). As I said everything was going well until driving it and tuning to find that there was a knock 1-8 cyls at W.O.T at high speeds. Around town, part throttle, half throttle, etc was no knock just at W.O.T. The knock went as high as 7 degrees then drop off to 4 degrees or less. I run 93 octane. the car has 79,000 on it and I still have the original spark plugs in it. (I had the car for a year, brought it used and didnt get around to the plugs yet.) The car drives great and very strong but cant do any more to it tuning wise until I figure out the knock issue. Help would be appreciated.

BlackImpSS

iTrader: (1)

The first thing I would try is some new plugs and wires since they are original.

91parkave

iTrader: (4)

plugs plugs plugs see my thread about plugs were both around the same mileage, however i still get some knock now only at around 5500 and up but i suspect that to be caused by now wobbly harmonic balancer..

bigboymike68

I figured as much it was the plugs. Should I stay stock or get something different?

91parkave

iTrader: (4)

diffrent go with NGK tr6 iridiums if possible however im running autolite xp103's which are a equvilent

DuronClocker

iTrader: (25)

Pull some timing out of it and keep tuning? It is pretty hot if you're anywhere in the southern US right now.

91parkave

iTrader: (4)

BTW i would only go with the MSD wires ini this case they offer the LOWEST resistance besides Granetelli. search if you dont believe me

Rob

iTrader: (6)

How much timing are you trying to run? Are you running ethanol or "real" gas? Could be running lean also.

bigboymike68

Since I am in the northeast I am running 93 octane. (lucky me) It was kinda hot that day. I didnt get to do any timing because of the wot knock. I did everything else though.

Mels SS

iTrader: (1)

Agreed!!

DuronClocker

iTrader: (25)

Why not? Was it an audible knock, or you just saw a few degrees on the scanner? These cars are pretty aggressive stock. If just a few degrees on the scanner, I'd say you should've just pulled a little timing where it was retarding it and go from there.

94ss06gxp

iTrader: (5)

I had tons of KR datalogging my stock tune. . . .

Rob

iTrader: (6)

Yes, the stock tune is very aggressive. At least for the gas that is out now.

bigboymike68

Yeah it was only a few degrees of knock. Between 4 to 7 degrees on the computer. No audible knock at all.

bigboymike68

Also what wires are you guys using for our cars. MSD and Granatelli doesn't show that they have kits for our cars.

DuronClocker

iTrader: (25)

Stock. They are like 4" long.