Knock Question

[srt-4nut]

Alright you guys are talking about plus or minus knock on the diablo, I did a datalog run and selected the st knk and Lt knk, I seen no knock until the upper rpms of third and fourth gear pull, they went from 0.00 to about 1.00 and hit the highest number of 4.50 or 4.00 for a split second. there was no * or - signs on the diablo just a straight number, what does that mean?

[Killasrt444]

yea..i keep reading on the forums here that people r getting knock with the dsp

[dereku]

Yeah I get the same thing. I can't seem to get rid of it with retarding timing too. I retarded the timing on one run that looked really good with knock only in the 5-6k range, and then the next log I recorded had knock everywhere.

[Nosfurato]

Quote: Originally Posted by srt-4nut

Alright you guys are talking about plus or minus knock on the diablo, I did a datalog run and selected the st knk and Lt knk, I seen no knock until the upper rpms of third and fourth gear pull, they went from 0.00 to about 1.00 and hit the highest number of 4.50 or 4.00 for a split second. there was no * or - signs on the diablo just a straight number, what does that mean?

Any number you see regarding knock retard,.. is only going to show as a simple number. Just take it as the computer has pulled that many degree's of timing out. There is no + in the world of knock retard. Its always a degree(s) of timing being subtracted.

On that note, if the computer is trying to remove , for example 2 deg's of timing,.. don't try to advance the timing 2 degree's to get the timing back. That will only make the problem worse.

As far as a lot of "people getting knock on the dsp" well, odds are, the knock was always there, and they are just now becoming aware of it.. or they haven't quite gotten a firm grasp on how to use the tool yet. Or, in some strange cases .. I have seen a couple of people that have a shitload of knock retard,.. for reasons that escape me.

Myself? My car runs great,..I almost never see any knock retard on pump gas (maybe a degree for a split second)

I have a little experiment that I have bouncing around in the back of my head, and I will probably have to enlist the help of a few people to try and answer the question.

Sad part is, even if I do figure something out.. there isn't a damn thing that "I" can do about it,.. but.. maybe some CMR's could. Dunno,.. I have next to none of the information I need at this point,.. so.. my search begins.

-me.

[omegashen]

Quote: Originally Posted by Nosfurato

Any number you see regarding knock retard,.. is only going to show as a simple number. Just take it as the computer has pulled that many degree's of timing out. There is no + in the world of knock retard. Its always a degree(s) of timing being subtracted.

On that note, if the computer is trying to remove , for example 2 deg's of timing,.. don't try to advance the timing 2 degree's to get the timing back. That will only make the problem worse.

As far as a lot of "people getting knock on the dsp" well, odds are, the knock was always there, and they are just now becoming aware of it.. or they haven't quite gotten a firm grasp on how to use the tool yet. Or, in some strange cases .. I have seen a couple of people that have a shitload of knock retard,.. for reasons that escape me.

Myself? My car runs great,..I almost never see any knock retard on pump gas (maybe a degree for a split second)

I have a little experiment that I have bouncing around in the back of my head, and I will probably have to enlist the help of a few people to try and answer the question.

Sad part is, even if I do figure something out.. there isn't a damn thing that "I" can do about it,.. but.. maybe some CMR's could. Dunno,.. I have next to none of the information I need at this point,.. so.. my search begins.

-me.

if you could on your quest for the answer could you compare stock timing maps mine was all jacked up thats why i had so much knock im beginning to think everyone knocks on stock original back up because i know i was i fixed my entire timing map and now im not knocking anymore.

[dereku]

If we do get our timing set right and only see a count of 1 or 2 for a split second is that acceptable?

[Mindmelt101]

Quote: Originally Posted by dereku

If we do get our timing set right and only see a count of 1 or 2 for a split second is that acceptable?

Absolutely.

[Nosfurato]

Quote: Originally Posted by omegashen

if you could on your quest for the answer could you compare stock timing maps mine was all jacked up thats why i had so much knock im beginning to think everyone knocks on stock original back up because i know i was i fixed my entire timing map and now im not knocking anymore.

Yes, that was part of the plan.

[YoNkErZsRt4]

Quote: Originally Posted by dereku

Yeah I get the same thing. I can't seem to get rid of it with retarding timing too. I retarded the timing on one run that looked really good with knock only in the 5-6k range, and then the next log I recorded had knock everywhere.

I don't know what mods you have but with bolt on's bigger injectors(stage2 rescale) worked for me with the knock for the most part and the rest was playing with the fuel and boost( i have a rage tune). i recently seen some knock( only like -1 or so) so i tried running no pcm boost, agp wga >>mbc>>turbo..and it worked no knock on 18psi falling to 15psi...i notice that the computer acts very sensitive to higher boost levels on pcm boost...AFR's, timing....i guess it might have something to do with the stock 2.5 map sensor?? so the combo with more fuel and the boost not hooked up to the pcm is helping my car as of now...i just gotta tweek the fuel and the timing a little more and i'll be good. after whiching back to my mbc i notice my afr's got a little richer( 10.9-11.2). anyway this is just my experiance with this car it might be diff. is diff. situations. This car gave me hell to get rid of knock and all this tuning shit. its been fun tho..drove Nemo nuts and everyone else that was helping me...lol

[srt-4nut]

Alright my stay about 1.00-3.00 is this acceptable or is this going to cause damage? it hit that 3.50-4.00-4.50 at just about redline. I have the 93 octane tune installed. How do you just the timing on that tune. Bare with me these may sund like stupid questions but I have never had one of these programmers before, I used to be into the oldschool turbo dodges and tuned of the egt. Thanks alot for everone's help it is greatly appreciated.

[dereku]

I am going off by memory here but I think you have to go to performance tune, 93 oct tune, modify perameters, scroll down to WOT fuel, and then select the rpm range you want.

[Nosfurato]

Quote: Originally Posted by dereku

I am going off by memory here but I think you have to go to performance tune, 93 oct tune, modify perameters, scroll down to WOT fuel, and then select the rpm range you want.

What are you trying to answer my man??

[dereku]

SRT4 Nut asked how you modify to timing in the 93 oct tune.

But now that I look at it I said fuel, but what I said is the same thing, but look for WOT Spark.

[srt-4nut]

Do you think alot of the problem is people are running to much boost on there stock fuel system and thats why they are seeing the knock hit at the high rpms at wot? they are leaning there car out. More Boost does not mean a faster car.

[Secondchance]

if you were maxing out your system, you would show lean + knock, not just knock.


Add fuel up top and see if it makes a difference. Again if your on stock plugs, i saw a tremendous difference with the ngk iridiums on a low gap (.30)

if you still see a little knock, just remove a degree of timing at a time till its gone.