• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

A whole lot of crazy knock

chrsmi1

chrsmi1

Awesome Level Member
Just like the title says i experienced a whole lotta stupid knock this morning on my way to class. I log pretty much every trip longer than a few miles on my tablet with the torque app and my elm 327, and on my trip to school around 9:30 (about 14 degrees outside btw) i got 11 readings of knock above 2 degrees. Just wanted some input on why this possibly is. I'm attaching the log with those readings and the three other logs i took today, which all show significantly less knock and our within my normal readings. You can't attach excel documents here, so i put a link to them below.

And just to stop some comments before they start, I know that any knock is bad. I have read the safely modding my 3800 thread multiple times, i'm not going to pulley up a size.
I have 42# injectors, new o rings for them, the ev1 to ev6 adapters, and a new fuel filter sitting in my living room with me now. I'm switching to E85 soon (as in whenever i get a chance, possibly as soon as this weekend).
Plugs are brand new autolite 104's with less than 1000 miles on them. just changed them three weeks ago. Newish wires (>5000 miles on them), no issues car runs great.

Any Ideas? Should i be worried?

here is the link with the 4 excel documents for anyone who wants to see them and offer advice.

https://drive.google.com/folderview?id=0B9w10934KXx8QWZKOFN6bjJyVlU&usp=sharing
 


was the advance normal. i think stock the IAT table adds spark when its cold. any chance of that? maybe bad gas? i see you have a overkill pcm not sure what he does with that table.
 
by the way your trims are all over the ****ing place...whats the deal there. and your IAT goes like 40 degrees colder in the cells where the knock comes in
 
This tank is a mix of 5 gallons of e85 and 8 gallons of 93. my ltft's have been kinda high, near max 16.4, but the car seems to run fine and ran fine the whole way there. I'm not sure about the timing advance or the IAT table. Someone more knowledgeable then me can check my logs and see. Both should be on there.

Never had any knock this high btw. normally well below 2* with me driving like a mad man. around 1.0 - 1.5 a couple of times is normal for a 20-25 min average trip with me going WOT quite a bit. I drive it pretty hard lately.
 


that makes it harder. you should sort it by time so that we can see the before and after cells at the time. it will be easier to see what is going on.
 
i wouldnt think so to be honest especially if you had some e85 in it. octane should be nice and high. you might just have some cells that need to be adjusted in an area of your MAF table. do you log MAF frequence if you could add that line that may help.

how does overkill do their pcm? you tell him your mods and he sets it up from there? its way off. you should be under 5 percent all them time on the trims. havent changed anything since the tune have you?
 
if i run just straight 93 then the trims are just about perfect. it's this e85 that has them off. its the most i've ever put in and i've never had my trims maxed out before.
i don't log any MAF settings but i'll set it up and if it goes haywire again i'll post them.

Yeah, you tell overkill your mods and he adjust them accordingly. Nothing new mod wise since he tuned it for the plugs, thermo, mps, headers, and intake.
 
I uploaded an older log from December, before i changed plugs and with no E85 in it for reference for anyone.
 


Mixing Corn and pump will cause trim issues and could cause AFR issues. I have tuned cars that had wonky trims due to mixing fuels. Is the KR you are seeing cruise kr or is it all coming at 100% throttle
 
From the looks of that one log, none of it came at WOT. I need to stress that this is the only time i have had that much KR since stock. But this is also only the second time i have ever mixed E85 and pump. And this is the most i've ever put in.

I guess i'm going back to straight 93 till i switch completely.
 
If its not at WOT then I wouldnt really worry about it. Lots of cars have blips of cruise KR. But I would recommend going back to straight 93 till you switch completely.
 
I was just curious as I normally don't have more than a few small readings of KR during a typical trip i log. Thanks for advice.
 
You must log in or register to reply here.
Back
Top