LS3 Knock Sensor Sensitivity??

[WS6FirebirdTA00]

yes, it is where all other knock sensor settings are

engine>spark control>knock sensors>knock sensor level

[domestic rice]

yes, it is where all other knock sensor settings are

engine>spark control>knock sensors>knock sensor level

Ok then I half the "INITIAL LEVEL" and the "MIN LEVEL"?

And as for the "Decay" he aspeaks of that is in the SPARK CONTROL-->SPARK RETARD--> DECAY RATE



Sorry to be so clueless but a lot of what is talked about is not said exactly as it is on my program (gen 3 car vs. gen 4 truck), And I dont want to blow up my new ride.

[WS6FirebirdTA00]

You are in the gen 4 section, this started about the 2008 Corvette

...but yes, those tables.

[turboLS2]

You are in the gen 4 section, this started about the 2008 Corvette

...but yes, those tables.

I'm adjusting the tables for my 09' G8 GXP so there would actually be three tables to adjust?

Engine-->Spark Control-->Spark Retard-->Knock Retard Decay x 2
Engine-->Spark Control-->Knock Sensors-->Knock Sensor Initial Level x .5
Engine-->Spark Control-->Knock Sensors-->Knock Sensor Minimum Level x .5

Car has been pulling timing but there is no actual knock even when running a conservative A/F ratio with 24 degrees timing. Are these the correct 3 tables?

Thanks!

[Sneakyws6]

Turbo good luck with getting those adjusted, I have a 09 G8 GXP as well and the freaking thing is soo soft off of the line because the computer is pulling timing for no reason.

I have done the double and half adjustmets and then some in the knock tables. I am finally getting to the point of where it feels alot stronger off of the line than it did before.

The main setting Russ is talking about are under:

Engine>Spark Retard>Knock Retard Decay> x2

Engine>Spark Retard>Knock Retard Attack> x.5

You will really need to mak some adjustments to the Burst Knock tables as those are the ones that are more than likely pulling the timing. I have made several changes to those and it seems like they are the ones making the most difference right now.

[WS6FirebirdTA00]

If you lower the levels, the knock will pick up EASIER, so it will be worse.

[5_Liter_Eater]

subscribing

[turboLS2]

Turbo good luck with getting those adjusted, I have a 09 G8 GXP as well and the freaking thing is soo soft off of the line because the computer is pulling timing for no reason.

I have done the double and half adjustmets and then some in the knock tables. I am finally getting to the point of where it feels alot stronger off of the line than it did before.

The main setting Russ is talking about are under:

Engine>Spark Retard>Knock Retard Decay> x2

Engine>Spark Retard>Knock Retard Attack> x.5

You will really need to make some adjustments to the Burst Knock tables as those are the ones that are more than likely pulling the timing. I have made several changes to those and it seems like they are the ones making the most difference right now.

OK I adjusted these two:

Engine>Spark Control>Spark Retard>Knock Retard Decay> x2

Engine>Spark Control>Spark Retard>Knock Retard Attack> x.5

plus I adjusted these two:

Engine>Spark Control>Knock Sensors>Initial Level> x.5

Engine>Spark Control>Knock Sensors>Min Level> x.5


These seem to have removed all of the retard except for what appears to be some burst retard on agressive throttle tip-ins. What tables in burst retard have you adjusted to correct this issue and how much did you adjust them?

Car is an 09' GXP so there is no DOD. I am running 24 degrees timing at WOT and commanded A/F ratio is 12.8:1

[RWTD]

So go get on a dyno and see if what you did was the "right" thing. I would never trust modifying knock sensor values without a load bearing dyno. Gotta protect your car's ass, bud.

[boomer]

plus I adjusted these two:

Engine>Spark Control>Knock Sensors>Initial Level> x.5

Engine>Spark Control>Knock Sensors>Min Level> x.5

If you lower the levels, the knock will pick up EASIER, so it will be worse.

I think you have this backwards

Like WS6 said, if you multiplying those tables by .5 it makes them lower, more sensitive.

[Frost]

So go get on a dyno and see if what you did was the "right" thing. I would never trust modifying knock sensor values without a load bearing dyno. Gotta protect your car's ass, bud.

While I would generally agree with this in whole (and it is easy to see), If you have a boltons car and the fueling is right, and you lower the WHOLE MAP 6-7deg and get the same sporadic KR in stupid places like when lifting from the throttle and in cruise as you saw initially then I'd say it's safe to call it false. Wouldn't you?

[turboLS2]

OK so now I have adjusted only these two:

Engine>Spark Control>Spark Retard>Knock Retard Decay> x2
Engine>Spark Control>Spark Retard>Knock Retard Attack> x.5

Do you guys increase sensitivity for tuning on the dyno and then go back to stock once you have the A/F dialed in? I am running 24 degrees timing at 12.6:1 A/F with no knock with these parameters. MAF tables are dialed in and ltrims average between -.4 to -1.2 in all cells with lots of logging under a load.

Thoughts?

[Garrett]

I have a knock problem like your on a LS3, I will do more testing soon to see what's the problem, if it's the knock sensivity or the ignition

[comm]

Quote:
Originally Posted by turboLS2 View Post

plus I adjusted these two:

Engine>Spark Control>Knock Sensors>Initial Level> x.5

Engine>Spark Control>Knock Sensors>Min Level> x.5

Quote:
Originally Posted by WS6FirebirdTA00 View Post
If you lower the levels, the knock will pick up EASIER, so it will be worse.
I think you have this backwards

Like WS6 said, if you multiplying those tables by .5 it makes them lower, more sensitive.



So did anyone work out if we multiply by .5 to decrease the values or 1.5 to increase the values to decrease sensitivity?

[WS6FirebirdTA00]

Already been answered.......

If you lower the levels, the knock will pick up EASIER, so it will be worse.

The lower the levels for the sensors the more knock you will see.

[tillman speed]

I took this threads advice yesterday, and it went very smooth!

I took the attack down to half and the decay up double and it was perfect!

I also lowered the maximum retard because the customer only uses good 93, and ethanol content is present, but not huge in the area he's in.

Also took the initial level and added like .1 or so and it didn't do a whole lot. I think if you took that and maybe added 5% to the whole row you'd be in good shape.

Also, the knock sensor maximum retard I pulled down a little bit.

[WS6FirebirdTA00]

You are playing with fire depending how much you lower max knock. If you set it up right, you want to leave those tables to pull out a lot of timing in the event that you do get a lot of knock. Just because the customer uses "good fuel" doesn't mean it is always going to be good or that something else couldn't fail. That is one parameter I like to leave at the high, stock levels.

[tillman speed]

Do you suggest reloading the max retard to stock and raising the sensitivity up about 5-10% or so? I want it to be able to hold 24-25 degrees of timing (11.5:1 Compression w/12.5 afr's) to redline without retard from the insanely loud exhaust/cam combo. It's pulling at 21 degrees right now. This is on good 93. I also zero'd out the burst knock.

[WS6FirebirdTA00]

I like to leave the safety there. Once you setup the KS tables correctly, you want it to pull timing when it sees real knock. I am only talking about the max retard values you spoke of.