Burst knock issue

[cc-rider]

Anyone know what I am doing wrong here with burst knock? I have a situation where the burst knock is repeatedly triggering multiple times in a row when I get on the throttle and put the car into boost (LS3 Camaro with a Kenne Bell PD blower). Makes it jerk and buck as you might imagine with 10 degrees of timing getting constantly added/pulled. I just tried to turn this burst knock back on after tuning with it shut off for months now. I put the settings back to stock LS3 settings for burst knock. Took it out for a run. See the picture below. You can see this repeated triggering I mentioned when I get on it.

I looked at the ZL1 burst knock settings and they are a bit different...but nothing dramatic. I can't understand this repeat triggering? Anyone know where I'm going wrong? Tune is attached too.

BKR.jpgv31 ve tuning set up - burst knock added back in.hpt

[h2.4]

I had a 2010 Camaro that had a similar issue with burst knock. I ended up disabling the burst knock. I also desensitized the knock sensors by roughly 20%.

[cc-rider]

Bringing this back up to the top again to see if I can get some help. I understand I can shut off BK, its what I've been doing. But I'd like to get burst knock working. The concept of it is very interesting for PD blowers that do blast the engine with very abrupt changes in MAP.

Anyone else ever experience this issue and have any thoughts on what I've got going on here?

[Dragracer187]

I would verify with external knock detection equipment to make sure it is false knock before turning off.

[Higgs Boson]

I always disable burst knock and I never desensitize the knock sensors. None of my cars knock or ping.

[cc-rider]

Does anyone know if the fact that I'm running a SD tune with the MAF shut off have anything to do with this issue I'm seeing (where BK is repeatedly triggered)? Perhaps it needs the MAF to work properly?

[HackAbuse]

I always disable burst knock and I never desensitize the knock sensors. None of my cars knock or ping.

+2 on never desensitizing. I usually won't disable it entirely, but I will always reduce it to a degree

[schpenxel]

I desensitize them all. It makes the logs look better when they go boom.

[waynehartwig]

Why does your MAF show so much air flow at 2300 hz and light throttle/cruising?? That might be part of it...

I always zero out burst knock, unless I have something weird going on where I have to assume at xyz it's going to knock. And I've never toned down the knock sensors. I hear all kinds of BS about certain headers/cam/pistons that can't use knock sensors, but I still don't remove/disable them, and I've never seen an issue.

[h2.4]

You should be able to get your timing advance pretty dang close in those load cells in Ve on the dyno. How do you guys tune cars or Ecu's that don't have knock sensors? I've tuned older formats that don't support knock sensors for awhile before getting into HpTuners. You need to learn to interpret the knock signal you're seeing rather than placing it as law.

[rjw]

I always disable burst knock and I never desensitize the knock sensors. None of my cars knock or ping.

what is the best method to disable burst knock on a gen V ?

thx

[Higgs Boson]

what is the best method to disable burst knock on a gen V ?

thx

BKR.JPG

[rjw]

BKR.JPG

wow, can't believe that I actually came close on that one...lol

thanks again

[Higgs Boson]

those two bottom green tables are 0'd

[cc-rider]

Or just zero out the cyl air table. At least that's how I did it.

[Higgs Boson]

yeah i overkill a lot of stuff

[rjw]

can anyone explain what burst knock does and why it's ok to kill it? or is that too obvious?

thx

[5FDP]

This thread describes it okay, google for more information.

http://www.hptuners.com/forum/showth...05-Burst-Knock

[cc-rider]

Burst knock is a quick timing pull based on how fast your cyl air is increasing. If it detects a massive rush of air from a throttle stab, it very briefly pulls back the timing to try and prevent knocking from the rush of air. Its quite a neat concept. Especially for those of us running positive displacement chargers that can whack the engine with a ton of air very fast.

[rjw]

Burst knock is a quick timing pull based on how fast your cyl air is increasing. If it detects a massive rush of air from a throttle stab, it very briefly pulls back the timing to try and prevent knocking from the rush of air. Its quite a neat concept. Especially for those of us running positive displacement chargers that can whack the engine with a ton of air very fast.

so, do have yours enabled?