widge

Hi All,

I have increased my boost to around 26psi, i have a map below and ive tried tracing the timing map when its on boost,

Im having a little issue where im getting some knock at around 6000rpm to redline, the timing map hasnt changed there from when i was on 23psi and i never got any knock there before, and i believe its the same cells too.

Its not knocking every pull maybe the first 2 and then the 3rd could go clean

Just want some input ill try get a log attached tonight.

SyZyGy1394

iTrader: (4)

What fuel, and what do you AFR's look like in said area?

widge

98RON AUS, but i think thats about 93OCT in US,

AFR is around 10.9ish ill log tonight and post the log with my Wideband Plugged in.

The thing i cant work out is that before increasing the boost it was still hitting those cells at 6000+

ziad

iTrader: (1)

that doesnt make sense. if u increase boost the load will increase as the airflow has increased. what load are u logging

widge

Nah what i meant was because the boost is falling off by 6000rpm

Im logging Load 1byte with Tephra V7 which means i dont have to log 2byte,

Ill log the car tonight and post the logs for the pull.

But i dont think the timing map is very aggressive, opinion?

lan_evo_mr9

iTrader: (10)

Probably just a bit too much timing for the amount of boost is all...

widge

Yeh im gunna log it tonight but i mean the difference in timing between Max Torque, no knok and then where it knocks its not even that much more timing ill log tonight can only check after logging ill post then

widge

Ok so its not knocking like i thought it was, im happy here are some screens of Knocksum and AFR using MAPTracer,

Ive also attached the Log too, note i did 6 back to back pulls this being the last, so this being the worst case scenario

Raptord

iTrader: (10)

The log looks pretty good, did it always knock at that same rpm & load point? If so, then maybe drop 1 degree of timing. Also, the car is running much richer than it needs to. Shoot for 11.5 at peak torque tapering to about 11.1 at redline.

widge

Yeh i know the car is running richer then it should be, and nah the 2 logs before that the runs where clean with 0 knock all the way through, and my first log had 2 counts up top so no the knock isnt always there its random and not much anyway.

I really need to get the car on a dyno to sort the AFR's correctly, but where i live in AUS 4WD dynos, there is prob 1 within an hours drive

Raptord

iTrader: (10)

why do you need a dyno to sort the AFR's? Just do 3rd gear pulls?

widge

The reason i want a dyno is because i think its going to take some time to sort the fuel map completely and i dont really like doing repeat 3rd gear pulls on the road, the road i go to is a long straight road, its an access road for the power station so i dont want people calling the cops while im there for more then half an hour

SLO-EVO

iTrader: (52)

Looks pretty good to me. Other than the slight righness and the 2 count. Have you tried pulling 1* timing? I would also lean it out a tad and see how that helps.

widge

That 2 count isnt there on the other 5 logs i have, as stated this is after 6 back to back pulls and this one had the most knock in it all others where clean

JDavenport

iTrader: (33)

On your timing map, trace the logs and see the timing transitions, not just the amounts. Looks like it might be jumping from 8 to 11 advance under load. Cell to Cell transitions of 3 degrees or more can also cause knock.