jjcuff1

I am trying to track down my knock.

IDLE seem ok and AE is getting better from bog to squealing tires form standstill now. I have knocks now at WOT. I have been able to isolate to the tail end of a WOT run. Usually about halfway through the WOT after BLM flat line at 128 I will get knocks in the 176-208LV8 1-5 degrees

I noticed during WOT the target AFR drops to 10 range during the WOT run. is this normal? What should it be 12.7?

see more below

jjcuff1

More info. As I look at my logs. I typical have seen BLM in Always more rich at idle !20-127 range with all other MAF tables at 127-130 range and anything over 1600 RPM was 130-132 range.

I played with AE and PE tables but nothing in upper ranges until I changed the Max airflow vs rpm table and my upper BLM dropped into the 120's. I still had some knock but not sure if noise. I seem to take timing out and it goes away but not 100% usally 176-209 lV8 with 2 volt or more TPS and a right at 2400 between 128-160 range I alwasy seem to have a row of knock in adjacent cells.


None of this is at cruise or part throttle, always sustained AE/PE runs for several seconds or more.

I will look through older logs before the spark table chnages ot see if I had same knocks there. Also after the RPm vs MAF table changes at first had good upper range BLM now it seems to leaned out across the board.

Not sure why now all tables are 130-132 range across the board. Maybe it is voltage issue now that I am driving longer but at least it is consistent across tables.

Any ideas on chasing down or testing knock?
The MAF #1 table is so sensitive to change the 2 cells for idle I in between vales of around .3 g/s IE I can only choose 7.2 to go to 7.5 or 6.9 and I seem to be in between these values any one see this?

Using the NB I am trying to figure out if my fueling for AE and PE is good or bad? Any tips. the BLM and INT flat line to 128. and the INT for the initial throttle increase seems tot spike lean but then half way through the WOT run the INT drop to 108 range and knock retard kicks in.?

My engine is loud with some valetrain noise, and probably exhaust leaks. the timing I have pulled out in the upper ranges is now down to 18degrees with no PE advance or cold advance retard. SO I can not imagine it is knocking and it doesn't feel or sound too bad. and in the lower ranges where timing is still 25-34 degrees I always get no knock.

jjcuff1

Looked at previous revs prior to messing with spark/pe and i had similar knocks there. Most cases not a much retard either. But then again my tunes were worse so less WOT runs. There is noise/rattle in that area and I could have wires/ hanging or knoxking. All the knock tjhough is in the upper lv8 ranges and non at idel or cruise.

One thing That I noticed though is my knocks counts since latest tuneup have gone down. I typically start up and go to 4-5 counts and even during a knock retard events my knock count only goes up 1-2 points? Is this normal should it be much higher number for real knock? Also the event seems to be well into the WOT maybe around a tranny unlock or lock? and during wheel spin and tire/tranny/rear end noise?

I will try the attack/decay and up the timing back to stock levels and add some fuel back to PE

although I found the leaner AE does feel better when you punch it. too many pulses and low decay and engine bogs and knock retard does seem higher

Ronny

iTrader: (1)

One could pull significant timing globally in tune and if it still knocks it is false. Or wait till gas is low in tank and add some racing fuel if available locally and see if KC' s cease.

jjcuff1

Well I had another post about AE with good results today.
I just took an older rev of my tune prior to massive timign changes. and I did some tweaks to AE and gave it a shot.

I had the same type of knock but actually the amount decreased. it was still just at WOT and higher lv8 but the car felt much stronger and smoked the tired from standstill.

I will go with this tune and tweak the AE to get better feel less bog. I think teh knock is false for sure or most of teh lower rpm knocks are. I might have knock at WOT 208 range but hard to tell from stock o2

I tweak the upper MAF tables but it doesnt seem to apply to fueling as much as PE tables and since the BLM go to 128 it is hard to tell how much I am off