Knock Sensor pictures of LT1 16188051 and 16181333

[EagleMark]

Someone was asking for pictures of the knock sensor inside the 94 95 LT1 PCM. Well here they are.

Not sure if they are same as 96-97 LT1 PCM which are the same, but run OBDII code and added a crank sensor, although the OptISpark distributor already did what the crank sensor was doing for SFI. Actually some 95 have both OBDI and OBDII trouble codes, I don't know if the operating system is same. Interesting system. I have always wanted to get a OBDII PCM and plug it into my car and see if I could flash a OBDI bin on it?

[Tunedperformance]

What is the part number on top of the knock module, it's hard to make out. Interesting !!

[EagleMark]

16177700

1055145

[Tunedperformance]

Is the 16177700 the first picture ? and not sure of the 1055145 what engine was that used in?

[EagleMark]

Both number were on the knock sensor. I opened the other PCM but the knock sensor was gone, was going to see if it had same numbers for you...

[Tunedperformance]

sorry, I misunderstood. I thought you were saying this was picture of two different knock modules The 16177700 is a Lt1

http://www.thirdgen.org/techboard/attachments/diy-prom/113525d1142184828-cylinder-select-netres-values-lt4-esc.jpg

[EagleMark]

So what is the purpose of that?

[Tunedperformance]

I was trying to compare the two. looks Like I can see how 2 of the 4 wires are hooked up. no to figure the knock filter resistance the black wire 3rd pin from the left to I'm thinking 5th pin.

[EagleMark]

I meant what is the purpose or reason to build a Memcal like this? Stock ones really that hard to find for TPI stuff? Or is this performance minded for LT1 knock?

On the Imapla SS forum they do something with LT4 knock module and sensor to LT1? But I never read about it?

[Tunedperformance]

The stock 90-92 speed density ones are getting real hard to find. the lt1 guys swap to lt4 knock modules because the lt1 is too sensitive and causes false knock and than retards timing.

[EagleMark]

Well mine never gets false knock or pulls timing? I raised timing and ran 92 octane and was fine, went back to 87 octane and found timing being pulled so went back to stock timing. Are they changing knock module and knock sensors? Mine is really the best I have ever seen, when I went back to 87 and got knock it would pull varied amounts as well, not a set in stone setting. I changed my knock history table y axis to spark retrd instead of knock count and used history std deviation and it gave me exact amount of timing to pull from each cell. Sweet!

Maybe they did something to engine like cam, headers, roller rockers I think I read make more noise or something but in stock form it works flawlessly. So buy up all the LT1 knock sensors guys have pulled?

[Tunedperformance]

Looks like when gm did the lt4 because of the roller rockers the changed the knock sensors and module. Just when i say the sd memcals are hard to come buy I bought 1 yesterday and am buying 2 more before the week is over . lol