Help with possible Knock issue

Z4fun

Hi,

I have a vortech v3 , stillen kit with top gunz a2a upgrade in my Z. it was originally tuned on uprev for years with 19 degrees of timing on top and no knock and had the stillen 600CC injectors and 9PSI pulley in florida and intake temps around 120 ish summer. Tuned by admin

I switched to ecutek after doing the soho intake relocation and seeing the afr's were getting lean. I re-tuned with admin the car was running fine no knock and 19 degrees on top, but injectors were maxed and startup was not good on SD tune.

Recently I upgraded to 1050cc ID injectors and re-tuned with Seb, the timing is the same but im getting possible knock in the mid rpm range but only sometimes. I can do the same pull twice and once will have knock sensor pass the threshold on one cylinder like 4 or 5 kind of random with each test and the car will pull timing 1 to 2 degrees. I will attach logs and pic.

I would like to know what is your knock thresholds and timing compared to mine, on the dyno its making almost 500 whp.

I'll attach 2 logs please let me know if any ideas, my next step is to add octane booster to test the knock.

Attached Images

knocklow.JPG (358.0 KB, 14 views)

Attached Files

Tests - 1TH1B - 2023-12-02 16-13-10.zip (76.9 KB, 2 views)

Spooler

Do you have a proper set of catch cans? If not, install those and see if it improves.

ByThaBay

What you need to do is run this program on a set of logs covering the entire RPM range:

https://www.dropbox.com/s/ww0pvzp2a6...ilder.zip?dl=0

This program will reconstruct the knock threshold table from within the tune and will show if it has been tampered with directly. There are also other ways to disable or desensitize knock sensors, but based on the data you're posting, I think you're after determining the KS threshold table from within your tune.

In order to determine the factory table, we need to know your calibration ID. If you can post it, I can open the stock rom and post the stock KS threshold table for you to reference. You can then compare the generated table from your logs VS the oem table to see what kind of tampering has been applied.

ByThaBay

let me know if you need help running the program.

Z4fun

Yes, please advise how to run this program?

redondoaveb

What did Seb say? Have you talked to him?

__________________
Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

ByThaBay

You must have Java installed. Search "download java" then simply drop your log files into the same folder as the .bat and .jar files, and double click the .bat file - the program will run and will produce a new KS table for you to review.

You can get the calibration id by using ecutek query ecu or using the bluetooth to check "ecu information"

Z4fun

Where do I find the calibration ID ?

Z4fun

@spooler yes I have duel catch cans.

@bythebay , thanks will download it, try to run it this evening and get back to you.

Just fyi, since seb tuned it I dont think I can edit the tune if we find something

Spooler

What fuel are you using and what brand? Exxon, Chevron, and No name brands are not that good. Try using Shell or BP(Amoco) 93 oct. if you are running premium fuel.

Z4fun

Im using 93 pump from Chevron. Thanks for the info, I will try using Shell and test on next fill up.

Spooler

Yeah, this may be part of your issue.