scanning for knock...

[wethepplebmxer]

How do i scan for Knock Retard... i'm close to installing a pulley and i wanna make sure everything is ok when i'm done...

[BNaylor]

You'll need a scanner capable of detecting and providing a readout of knock retard (KR) in degrees. I have the AeroForce Tech scanner gauge and also, Autotap for Windows with GM extended codes running on a laptop. Autotap will allow you to display a virtual gauge on the LCD display for KR.

http://www.3800performance.com/Merch...roduct_Count=0

[Dullboy]

I just installed an Aeroforce Interceptor on my '05. I was surprized to see that I have up to 6 degrees of kr at redline & wot. Does that sound normal to you?

[BNaylor]

Originally Posted by Dullboy

I just installed an Aeroforce Interceptor on my '05. I was surprized to see that I have up to 6 degrees of kr at redline & wot. Does that sound normal to you?

Are you stock or modded? It is not unheard for a stock GP to show that many degrees of KR at WOT but I would say that it is not acceptable.

[Dullboy]

I've only put an slp catback, k&n cai and 180 degree thermostat on it. I thought opening up the intake and exhaust was supposed to reduce kr. Also, I use 93 octane gas.

[BNaylor]

Originally Posted by Dullboy

I've just put a slp catback, k&n cai and 180 degree thermostat on it. I thought opening up the intake and exhaust was supposed to reduce kr. Also, I use 93 octane gas.

Technically, those mods should reduce KR. Is your PCM and SC pulley stock?

BTW - What KR are you getting at cruising speeds and moderate acceleration?

[Dullboy]

Yeah, I haven't done anything else. I'm wondering if going 1 or 2 degrees colder on my plugs would take care of this. It just seems strange to me that I have 6 degrees of kr, and with all of your mods, you only have around one. At cruising and light acceleration there is no kr.

[BNaylor]

Originally Posted by Dullboy

Yeah, I haven't done anything else. I'm wondering if going 1 or 2 degrees colder on my plugs would take care of this. It just seems strange to me that I have 6 degrees of kr, and with all of your mods, you only have around one.

Actually the right mods should reduce KR. I used to have 2 -3 degrees at WOT before headers and the custom 2.5 exhaust and Magnaflow Hi-Flow CAT with 2.5 in/outlets. Also, I have a larger 72mm ZZP throttle body with an LS1 style cold air tuneable MAF sensor. The CAI is Trasher. The re-programmed PCM should make a difference on KR too. A bigger 2.5/3.0" downpipe will help.

Try going with the next colder plugs first and then monitor readings. I recommend the Autolite copper core. 605 one colder, 104 two and 103 is 3 colder. Works in 04/05s too.

I thought the 04/05s had a 75mm TB stock which should help.

Good luck!

[Dullboy]

I appreciate your help. By the way, Your car looks great!

[BNaylor]

Originally Posted by Dullboy

I appreciate your help. By the way, Your car looks great!

You are welcome and thanks. 8 years of proud ownership. Let me know how it turns out. Good luck!