Knock module

[Guardiannknight]

Does anyone know if they make a knock module like the LT-4 knock module for LT1's? Or will the LT-4 knock module work on our cars?

I'm getting max KR when I go woot, and I have retarded the time down to 0 advance in timing and still get KR... LOL... yeah, gotta be false KR. I have reset my time advance back to where I had it, and I have fixed my AFR to run kinda rich(better safe than sorry), with NA and with my NOS. I would love to rid the false KR, just wonder if they made any better KR sensor for our cars?

I have been doing a lot of research on the web about the KR sensor, and I knew that headers and loud exhaust could cause some KR, but I have also found that roller rockers are well known for causing false KR, and I think between my roller rockers and headers, there lies my problem for the KR. :)

So, anyone know if they make a better KR module for our cars or will the LT-4 knock module work?

[ssms5411]

Re: Knock module

Last I heard Lt4 KR module won't work, I desentized my KR sensors by using inline resistors. Mine is at 40% desenitsized and I will still see KR on the scanner at times but I could run a 125 shot of nitrous with 25-26 degrees of timing without seeing any KR on the scanner. If I set it at 28 it would show KR in some cells and I never have audible KR. N/A I run 27-28 degrees at WOT and never show KR this is in AZ temps too. There is a write up on how to tap into the KR sensor wires coming from the PCM, I looked at the wiring diagrams that are on this site showing the PCM pinouts and then used the write up. Works great, 3800's are known for having false KR. I'll see if I still have the write up and post it.

[ssms5411]

Re: Knock module

Heres some instructions on it, I couldn't download the calculator that tells you what resistors to use. I'll see later on , but this gives you a idea. Sorry for the small pic , I'll get a better one in a little bit.

[Guardiannknight]

Re: Knock module

Cool, thanks :) It will give me some more to research with :) and at least a starting point for fixing the problem.

So you have a max time advance of around 25 to 28? I have mine set pretty high. In the 30's to up to 40 in some spots. What's the stock timing advance look like? Or better yet, does anyone know where I can get a copy of the stock tune for a 2000 v6 camaro, or around that year. :) just would like to see what the stock tune looked like. To have something to compare mine to. I started tuning a mail order tune when I got HP Tuners. So I have been adjusting stuff that they had changed or not changed :)

[bigbrian442]

Re: Knock module

Cool, thanks :) It will give me some more to research with :) and at least a starting point for fixing the problem.

So you have a max time advance of around 25 to 28? I have mine set pretty high. In the 30's to up to 40 in some spots. What's the stock timing advance look like? Or better yet, does anyone know where I can get a copy of the stock tune for a 2000 v6 camaro, or around that year. :) just would like to see what the stock tune looked like. To have something to compare mine to. I started tuning a mail order tune when I got HP Tuners. So I have been adjusting stuff that they had changed or not changed :)

If your timing is that high I wouldn't say it's false knock. Going past 27-28 degrees doesn't help anything.

I have both roller rockers and headers and don't have that problem. My knock retard is desensitized through HPtuners. Russ K has how to do it that way in more then one of his posts on the HPT board.

Images are stock 98 high octane spark tables. One is auto and one is manual.

[ssms5411]

Re: Knock module

I'm talking WOT timing not just whats in the cells, bottom right hand corner of the octane tables.

[Guardiannknight]

Re: Knock module

Thanks for the pics of the stock timing. I'll have to go over to HP tuners and see if I can find the stock tunes and look at them. It seems they bumped up the WOT areas about 10 to 15 in most areas.

But, I do think it's false KR, because I have lowered the WOT areas down in increments of 4 up to 8 , all the way down to 0 in a lot of the WOT places, and still saw 8 KR.... so, after doing that, I was like yeap, it's false, then after doing a lot of research online, found that a lot of people with roller rockers had issues with false KR and along with headers. Good chance maybe mine is just really sensitive compared to yours and others. Because I did see on the forums I was researching on and message boards, that some people had no problems and they had roller rockers and headers along with other mods. I think it's just some sensors are more sensitive than others??? maybe :P

With the info both of you have given me, I know have a good place to start from on the sensor and looking at the timing(comparing it to stock)

[bigbrian442]

Re: Knock module

A Lean condition will also cause spark knock. If your tuning yourself now you may want to start with a bone stock tune.

[ssms5411]

Re: Knock module

I always had problems still having KR even with Hptuners decay stuff modifying the cells, the resistors worked very well, after 30% though they will set off a low voltage signal. I just test mine every summer by adding 2-3 degrees and see if it will show KR, and so far so good 7 years later.

[Guardiannknight]

Re: Knock module

Yeah, I'll probably try the resistor route :) I'm for certain it's false KR. Because my wideband O2 shows I'm running rich and right at the AFR I have set with my HP Tuners for the power enrichment settings.

[ssms5411]

Re: Knock module

I've had great luck with the resistors. I was first worried about it wouldn't show KR at all but they still do. Good luck with it and follow the directions.

[Guardiannknight]

Re: Knock module

Quick question, what number octane do you all run for NA and for nitrous? I run 93 octane all the time, and ran 95 to 96 octane the last time I ran with nitrous. I found some NOS octane additive that pushes the octane number to 97.5 or 98 with 93 octane. Found several sites on the net that did research on several octane additives, and they had the results come out to 97 to 98 with the NOS additive with 93 octane fuel. So, I plan on running that with my 100 shot.

Reason I'm asking, I downloaded a stock tune for a 1998 v6 Firebird, and the time advancing is pretty far off. I'm attaching a pic that shows the difference between my current high spark and the stock one I downloaded. So, should I aim for about mid 20's for nitrous in the WOT area and then a few degrees higher for NA. Taking in the octane number I will be running?

Thanks for your idea's and help on this :)

[crazytrain65]

Re: Knock module

what size resistors does this need? Ohms...Watts...etc

[bigbrian442]

Re: Knock module

If your tune has 16 degrees more timing than stock in the middle/ lower right side of that table, you have way too much timing just on the motor.

[ssms5411]

Re: Knock module

If your tune has 16 degrees more timing than stock in the middle/ lower right side of that table, you have way too much timing just on the motor.

Damm , 16 more degrees ,surprised your engine is in one piece. To be safe with a with nitrous you could try 20 degrees WOT timing then move up from there, I ran 25 degrees with mine with my mods, but each car is different esp. with different mods. When you monitor use Historgrams and if a red cells pop up then lift of the gas, there showing you your getting up there in the KR area.