Hey my evo has been having knock in the weirdest place.

It will knock like 20 counts at around 2800-3000 rpm at around 160 load, like around when the turbo starts to spool.

Anyone know what might be causing this?

 

post a log and list mods/boost/octane for starters

 

bro im having the same exact problem as u! in the same rpm set and everything it sucks, its pulling timing like crazy right?

 

I dont have the log right atm.

Mods
Ams LICP, BC272 Cams, Walboro 255, ARP Headstuds, Open filter on stock intake pipe, Forge DV, Forge MBC.

At about 21-23 PSI Boost, and on 93 Octane.

 

without seeing the fuel/timing maps and a log, there's no way to help

 

Alright i will try to get the logs on here as soon as i can.

 

I have been tuning mindoftw's car. I sent him the logs from last night to tune to post up. It was the weirdest thing. the car was running fine, we were getting the boost dialed in. He had about 1/4 tank of gas so he filled up with shell 93. Unfortunately they were filling the gas tanks at the station so i have a feeling we may have gotten a VERY bad tank of gas. Ever since the fill up the car was getting odd counts of 20+ knock. sometimes at spool sometimes at cruise and other times not at all. I personally have never seen anything like it. The car is back on the OEM timing and fueling doing the same thing.

 

EvoScanDataLog_2009.05.15_20.33.56.zip


Here is a log file from last night that shows it.

 

that's a tricky one, all part throttle 2500-3500 area, what does it do if you go WOT at 2500-4500?

 

I'd say unlikely that them filling the reservoir at the station is an unlikely cause, thats a myth IMHO.

What rom? different rom than came stock? Rescaled load?

 

well it seems to knock for that short period of time, and yes it is a different rom then before. after 3k rpm it seems to not knock at all.

 

The tricky part was it started doing it out of the blue!

I did change roms, his original rom was 94170008 and i moved him to 94170015.

I am really lost on this one unless something is mechanically wrong. he is literally running v5.10 with stock tune except for rescaled MAF settings

 

I started having weird part throttle knock issues when I switched from 0008 to 0015 on my Evo. I checked the knock filters on my end and noticed that the first column in the knock filter map 1 is all jacked up on the 0008 rom. On the 0015 rom the first column is steady. I'm pretty sure that the knock has been there, but the sensor just wasn't taking it into account with the values being different. You might wanna double check your version of the 0008 rom's knock maps. I've been trying to tune it out for about 2 weeks now and the only issue I can see is that once I get one section fixed it, it happens in a different area.

 

on the real knock stuff or the old, fake stuff?

 

I checked the real knock tables and everything is the same. There are some differences between the old thought to be knock filters but i am not sure if that means anything since no one understand what those truly do.