mvvette97

iTrader: (18)

Is this the same for the corvettes? My vette is a 97

bww3588

iTrader: (49)

you can desensatize the KS, but that is only a bandaid. you can also tune them out completley, but then if you really do have knock detonation or whatever, and the comp doesnt pull timing, your motor is toast.

95 Z28

iTrader: (21)

Just bought my sensors and harness from GMpartsdirect today...98 bucks...hopefully they come in a somewhat timely manner.

Havok2

iTrader: (118)

interesting....

5_02ls1

iTrader: (20)

mine was a 97 build date and it had the old ones so id say its safe to say a 97 vette had them....

waveoff

iTrader: (11)

Resurrecting an old thread here.

I'm getting ready to put an STS kit on my car and have been "prepping" it so it's running in tip top shape before I put the kit on. I was getting 3.9* of knock retard at WOT on my '98 and stumbled across this thread about a year ago. I kept putting off the knock sensor swap until I decided I wanted to start really modifying my car. So I ordered some knock sensors from another member that came off of a new LS6 crate motor. I pulled my intake manifold today and discovered that my knock sensors were the newer style (5/98 build date). They still looked mint but I replaced them with the sensors I bought anyway. After I button it all back up and take it for a drive I'll report back with my results...

Lt1Porsche

iTrader: (6)

Keep me posted on what happens.

waveoff

iTrader: (11)

Welp, I just got back from my test runs...I still have 3.9* knock retard at WOT. I don't know what to do now. New knock sensors evidently weren't the solution for me! That's $70 down the drain...

JGA

I have a question. Can you intall the STS system if you have subframe connectors running under the door sills, like on almost all subframe designs for 4th gens? I am interested in the system, but I do not want to tear-off my nice custome subframe connectors.

waveoff

iTrader: (11)

From what I understand you can not run subframe connectors with the STS kit. I'm sure one could get creative and make new charge piping though.

waveoff

iTrader: (11)

Okay, I just loaded my stock tune back on and did a hard run. Guess what? No knock retard! The "tune" I was running evidently had a little too much timing. With that in mind, I wouldn't recommend anyone to run the power program from a hypertech power programmer III. HPP3's seem to be good only if you want to change your gears or shift points.

So I guess my old knock sensors were good all along. Dummy me for not logging a run on a stock tune with my old knock sensors. Oh well...lesson learned I suppose. Anybody want some newer style knock sensors out of a '98?

DiabloFormula

iTrader: (58)

My build date is also 4/98 and I have the new style as well.

intense3123

When checking your KR, if you have the old style sensors, will it show 4* pull all the time, like at idle? Or does it just show it at WOT?

waveoff

iTrader: (11)

From what I've gathered it's at WOT. I've found some posts that say all of the time but I have never seen any hard proof (i.e. log files) that 4* all of the time.

LS1-450

iTrader: (33)

My experience regarding the 98 sensitive knock issue was with the actual GM knock sensor software. Those of you whom have swapped the sensors & still have knock retard issues should look into this. Granted a too agressive spark table is gonna cause knock retard regardless; that's a different issue.

While tuning my car (EFILive) the knock sensors had me modifying the spark tables to rediculously low numbers; down to 15* @ WOT. So, after what seemed like thousands of test runs, decided to look into the knock software from 98 on. Found that the GM software controlling the "new-style" 99 & later sensors is different from the 98 knock sensor software. So, I copied a stock file from a 2000 GM knock sensor & the knock reduction went away. I am not talking about changing the sensitivity or other tuning options, am talking specifically about only the stock knock sensor software. After copying, I even reduced two of the 2000 software settings because they differed quite a bit from the 98 software. Anyway, ended up able to run better than stock spark during WOT (mods in sig).

To recap: the 99 & later knock sensor software is different than the 98. This difference caused my knock sensor problem. I have a 98 PCM & new style knock sensors. Again, I am talking about only the "knock sensor software" oprion in the tuning file, not any of the other knock sensor tuning sensitivity options.

waveoff

iTrader: (11)

Wow, that's good info there and definitely something to look into if you have tuning software. Which parameters under "Knock-Software" did you reduce after copying? I just looked at a stock 2000 tune and the numbers are pretty different. These are the values I have under "Knock-Software". Are they comparable to what you have?

140.012140
120.005561
150.015429
Cylinder Mode
0.333008
0.500000
35.000000
1.992188
1.191406
0.000000

These are the values from my stock tune and are the same values in the stock '98 tune provided at http://www.holdencrazy.com/EFILive/stockTunes.php Do you or does anyone else have the parameters from a '98 car with the old style knock sensors for comparison?

LS1-450

iTrader: (33)

The important values from a 99+ knock software is the difference of 140, 120, & 150. The rest is up to what you want. The 99+ software uses 245, 210, & 245. I reduced these numbers to 225, 200, & 225. The numbers you posted are the 98 PCM knock sensor values & are were not upgraded (modified) w/ the new style sensors.

waveoff

iTrader: (11)

So are you saying that the values that I posted (which are stock 98 PCM values) are the same values that were causing your knock? I'm using those values I posted and I'm not getting anymore KR. But I guess it's something else that people can look into if they're still getting KR after changing out their sensors.

LS1-450

iTrader: (33)

Yah, it looks as though you are running 98 stock heads, intake....etc., yes? Also, I think that the new sensors are designed to operate @ the new software values, which are slightly higher than the 98 original sensor & software values. We are talking about millivolts. I agree with your statement; if there is no issue after swapping to the new sensors, then a software mod is not necessary. It's probably my set up that causes the difference & would expect that others using a 98 PCM with aftermarket, heads, cam, intake to have trouble with knock software. Every 99 through 04 uses the new software & sensors. So, there must have been many false knock or over sensitivity problems w/ the original 98 set-up. Not for everyone, but, enough to justify a change. Hoping this information is of use to others.

waveoff

iTrader: (11)

Thanks for the clarification...good info!