PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

procharged car knock between shifts?

Thread Tools
 
Search this Thread
 
Old May 5, 2022 | 07:40 PM
  #1  
mstansbury0704's Avatar
Thread Starter
Launching!
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Oct 2019
Posts: 279
Likes: 28
Default procharged car knock between shifts?

IF someone can take a peak at this log...
during the first WOT runs through gears 2-3-4 im getting 4 degrees KR on every shift, later on in the log on a 3-4 shift I got none? WTF? Safe to say this is false knock? if so I will ignore and continue on.

Tune not finished but runs and drives fairly well, DFCO turned back on.. is it possible not having the high rpm low vac areas done in causing some of this??Kind of just interpolated those, i never plan on really being there unless im WOT... Tuned on stft to 3600ish to within +/- 2
ls1, 225 prc heads 62 cc, 235/243 | .630/.615 111LSA cam. making 8-9PSI
11.0 commanded AFR. Pump 93 & 50/50 meth 10GPH nozzle on at 3 psi and max at 5 psi. Spark stupid low and conservative. Supposed to rain entire weekend. Really need a good day in the car to get everything nailed in solid..Just hate spinning the car to 5 grand to do VE tuning.
Attached Files
File Type: hpl
wot rip.hpl (1.71 MB, 74 views)
File Type: hpt
closed loop 11.hpt (248.7 KB, 41 views)

Last edited by mstansbury0704; May 5, 2022 at 08:28 PM.
Reply
Old May 5, 2022 | 08:37 PM
  #2  
BCNUL8R's Avatar
10 Second Club
20 Year Member
Community Builder
Liked
Community Favorite
iTrader: (2)
 
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Default

Most likely false knock from the shift. Best to pull a couple plugs and verify no signs of detonation. Easy to spot little black specs on the porcelain of the plugs. If you put new plugs in it then make a pull and check plugs after that you will know for sure if there was actually any detonation.
Reply
Old May 5, 2022 | 09:07 PM
  #3  
mstansbury0704's Avatar
Thread Starter
Launching!
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Oct 2019
Posts: 279
Likes: 28
Default

Ah, we meet again. Lol Im really almost certain that’s it. I think my exhaust Y pipe clacks my torque arm sometimes. Just wanted someone to make me feel better. LOL.

I wouldn’t imagine it’s knocking 4 degrees like that with no load..I guess I could pull spark out of the higher rpm low g/cyl areas and see if it goes away..i could pull 5 degrees out of 4,000-8000 rpm areas without much issue unless it’s referencing another table during clutch in...I might pull old logs and see if it did the same before. I thought it was burst knock as it pulls KR as soon as tps is registered but I thought I zerod those out long ago. Plus IF I remember i don’t think burst knock shows up on the scanner as KR. Stupid car. Lmao
Reply
Old May 7, 2022 | 07:40 AM
  #4  
mstansbury0704's Avatar
Thread Starter
Launching!
5 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Oct 2019
Posts: 279
Likes: 28
Default

Anyone know what spark is referenced during WOT clutch in transitions? at first on my logs i couldnt figure out where 28 degrees was coming from, but then I guess during 0% tps its jumping back to the idle spark tables and the overspeed table is taking out -12 and for that minute second its referencing the idle spark tables since tps is less than the min value for the high low octane tables(is that correct??) thinking of setting it up to drop from 28 degrees to 24 degrees on clutch in transitions and see if it still shows knock randomly.

Just wondering if anyone else has done this to verify false knock on shifts? looks like its picking up KR as soon as shift is complete and TPS starts to move. so its within milliseconds of clutch being released.

EDIT: new file with some VE smoothing done and spark tables fingered with
Attached Files

Last edited by mstansbury0704; May 7, 2022 at 08:57 AM.
Reply
Old May 8, 2022 | 04:07 AM
  #5  
gametech's Avatar
TECH Veteran
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Top Answer: 1
iTrader: (1)
 
Joined: Sep 2004
Posts: 4,905
Likes: 906
From: Stockbridge GA
Default

Almost certain that burst knock shows up as real knock on logs. This could really affect your approach to tuning.
Reply




All times are GMT -5. The time now is 03:11 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE