Idle tip-in/throttle blip knock

[tomm.brz]

please. do also a video with engine bay open and look carefully near the injectors

with oft i don t know if you can log cilinder misfire but would be good to log
Don t you have access to 93oct? not rhe best idea to go to "extensive drive" with a tune that brings the advance multiplier under 0.3....

[Nfsundrgrnd]

Originally Posted by tomm.brz

please. do also a video with engine bay open and look carefully near the injectors

with oft i don t know if you can log cilinder misfire but would be good to log
Don t you have access to 93oct? not rhe best idea to go to "extensive drive" with a tune that brings the advance multiplier under 0.3....

We have no 93 in my province unfortunately. Here's the spirited drive log.

https://www.dropbox.com/s/8mlosykguk...drive.csv?dl=0

[tomm.brz]

Can you update it by yourself to datazap.me ?

[tomm.brz]

Buddy log is terrible.I mean how it drives, it tends to be rich and pull out a -10% ltft (not nrcessarily bad per se), then after 5000 rpm it goes super rich in open loop and max out the lambda scaling for how rich it is, advance multiplier of 0.18 (BAD) and still knocking
I would bet it also get some misfire but can t say from log
I still think you have a damaged DI oring and you lost compression and it misfires too

[Nfsundrgrnd]

Originally Posted by tomm.brz

Buddy log is terrible.I mean how it drives, it tends to be rich and pull out a -10% ltft (not nrcessarily bad per se), then after 5000 rpm it goes super rich in open loop and max out the lambda scaling for how rich it is, advance multiplier of 0.18 (BAD) and still knocking
I would bet it also get some misfire but can t say from log
I still think you have a damaged DI oring and you lost compression and it misfires too

Damn lol the shortblock barely has 10k kms on it too. Hopefully replacing the DI o-rings will make it run good.

[Nfsundrgrnd]

Originally Posted by tomm.brz

please. do also a video with engine bay open and look carefully near the injectors

with oft i don t know if you can log cilinder misfire but would be good to log
Don t you have access to 93oct? not rhe best idea to go to "extensive drive" with a tune that brings the advance multiplier under 0.3....

Don't have anyone to blip the throttle for me ATM, but will try to find someone. I'll look into logging misfires as well.

[Clipdat]

First time datalogging and I think I messed this up, because the other day I switched the FLKC data field for oil temp instead.

I forgot to set it back to FLKC so that value didn't get logged. So this may be worthless and I might have to do it over again.

https://datazap.me/u/cd1210/stationa...og=0&data=1-13

[tomm.brz]

you d need to log more whiledm driving and also pulling full throttle
Anyway you too have a low advance multiplier of 0.68 so your car is knocking

other than low advance multiplier and negative ltft (not enough to say not good) that log is ok
Which tune do you have? early cars have 700C/A00C that have the transient retard map on the left:



you see no retard over 5200rpm , it s there that the damage to DI oring is done, when shifting aggressively over 5200
Blips from idle in neutral are not hard to the engine even with an early tune
if you don t have one of those early tune or you have an oft tunes since long time, i wouldn t think of DI damages
The bogging sound when flooring the throttle from 800rpm could just be the -10 degrees of timing in that table in the first row, restyling cars have 0 in that row and they bog less in the same situation, but will lag more when flooring from anywhere over 1200rpm, so maybe do a video too

also you d need a retune because clearly your car is knocking often

[Clipdat]

Thanks so much for taking a look at the log so quickly, really appreciate it!

I can definitely do a log with actual driving tomorrow instead of just revs, with the FLKC field enabled. Happy to make a video too of it happening to show the noise.

Yeah, I noticed that the adv multiplier was only 0.68, which I thought was somewhat strange. This is the stock tune ZA1JB01C on a 2014. Previously the car was on a OFT OTS 91 tune for a long time before I purchased it.

"also you d need a retune because clearly your car is knocking often" - So better to just flash a OTS 91 tune at this point versus continuing to troubleshoot this on the stock tune? Also, could you kindly let me know what data you're identifying that shows when it's knocking? Is it the "kc learned" numbers that show up right at the start of the rev?

FWIW, here's another log where I throttle stabbed once at the beginning and it made the sound, but then I revved hard and several times at higher rpms and really went for it and no strange noises or knocks whatsoever: https://datazap.me/u/cd1210/higherrevs?log=0&data=1-13

[tomm.brz]

log is ok
There is no knock so i think the sound is just ok

for knock you look at Knock correction and flkc and advance multiplier, do not look at kc learned

stg1 91 is a better idea yes, if you want i mod the transient map for you and you let me know if the sound when stabbing from idle goes away

[Clipdat]

So because "knock correction" stayed at 0 throughout the logs, that means that there was no knock at the initial throttle stab when I heard the sound?

I guess I got confused because you also said "you too have a low advance multiplier of 0.68 so your car is knocking" so I thought you meant that there were knock events in the data, besides just being at an advanced multiplier below 1.

This is Chevron 91octane fuel, so this means that the stock tune is looking for 93 in order to have an advanced multiplier of 1?

"if you want i mod the transient map for you and you let me know if the sound when stabbing from idle goes away" - wouldn't it be the updated transient retard map if I flash an OTS 91 tune anyway?

[Clipdat]

I loaded both the V2.076 "Stage 1 - 91oct" and V4.03 OTS tunes onto the OFT.

I read some people saying they actually preferred the V2 throttle response/mapping over the V4. And not liking the cold start disable on the V4, etc.

Any thoughts on which one I should try first?

[tomm.brz]

v2 91 has timing for 91 and aim to an advance multiplier of 1
v4 is made for 93 oct so advance multiplier will float around 0.6-0.7 with 91oct as in your case
Not a big difference, with v4 you let the engine knock so that it learns the maximum timing for your fuel, not the best but it s the same as OEM strategy, not a big deal

Yes sorry i meant that your car is knocking *in general*, stock tune always starts up with 0.7 advance multiplier, if it goes lower than that it means it has knocked before and advance dropped further
A driving around log is more usefull, like OP did
Just stabbing at idle with no load is not so usefull

[tomm.brz]

try this for 91oct B01C
v2 with transient mod

Stg1 B01C V2 91 Oct Transient mod