Does this sound like 'tip-in knock'?

[drewbot]

@1Cor10:23 FWIW, I have an AT and that sound comes when it auto blips during downshifts.
I'm running Shell V-Power

[1Cor10:23]

I'm going to do a mini write up and update op tonight but basically after switching to ultra94, the noise is drastically reduced / non existent, only hear aggressive intake air rush noises on throttle blips.

Also, IAM immediately went from a low of. 57 to. 98 in the span of about 1 hour of driving after filling up with ultra 94 (had 6 liters of vpower left).

I'm not going to bash on vpower because I know it's a good fuel but could've gotten a bad batch but for now going to fill 94.

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[mxsled]

Originally Posted by moto-mike

That is definitely tip in knock. You won't see it on datalogs necessarily. Our car had it that bad from the factory and we get rid of it on our tunes.

I can confirm that the Moto East ecutek tune get rid of it
(I'm using shell 91 vpower)

[s2d4]

Originally Posted by vtmike

Logged with the tune and confirmed it would pull timing (negative knock correction value) when first giving throttle and I had the audible ping. Haven't logged with stock tune, but the noise is gone.

Unless you had a ridiculously bad tune.
Looking at the stock tune to my current tune, it is pretty clear why stock was much worse for me.

[hmong337]

Originally Posted by 1Cor10:23

I'm going to do a mini write up and update op tonight but basically after switching to ultra94, the noise is drastically reduced / non existent, only hear aggressive intake air rush noises on throttle blips.

Also, IAM immediately went from a low of. 57 to. 98 in the span of about 1 hour of driving after filling up with ultra 94 (had 6 liters of vpower left).

I'm not going to bash on vpower because I know it's a good fuel but could've gotten a bad batch but for now going to fill 94.

Sent from my Nexus 5 using Tapatalk

I've been telling everybody since the beginning... USE ULTRA94!

Why the hell would you use anything less when we have 94 octane at our disposal?! Only the idiots will tell you otherwise.

The car calls for 93 octane to run optimally. Sure it runs on 91, but why bother when we can get 94?!

TRUST ME, just fill Petro 94 and you'll be good to go. That's all I've been running since my first fill up and will not use anything else. My car runs like a champ.

[Thorpedo]

Originally Posted by hmong337

I've been telling everybody since the beginning... USE ULTRA94!

Why the hell would you use anything less when we have 94 octane at our disposal?! Only the idiots will tell you otherwise.

The car calls for 93 octane to run optimally. Sure it runs on 91, but why bother when we can get 94?!

TRUST ME, just fill Petro 94 and you'll be good to go. That's all I've been running since my first fill up and will not use anything else. My car runs like a champ.

There is no 94 in my area. 91 is the highest in my entire province as far as i know. My car 'runs like a champ' too, I just get the knock when i first press the accelerator.

[hmong337]

Originally Posted by Thorpedo

There is no 94 in my area. 91 is the highest in my entire province as far as i know. My car 'runs like a champ' too, I just get the knock when i first press the accelerator.

Well that's a different story if you only have access to 91. Kinda like Cali. But to the guys that have readily access to higher octane, you really have no reason to pump anything less than 93. It spells it flat out in the owner's manual... Pump 93 octane - 91 will work but not recommended. Your car does not run like a champ if you're getting knock lol.

Pumping 91 when 94 is readily available is like choosing to be 2nd place. Sucks even more if 91 is all you have.

[vtmike]

Originally Posted by s2d4

Unless you had a ridiculously bad tune.
Looking at the stock tune to my current tune, it is pretty clear why stock was much worse for me.

TRD intake and stock tune works really well for me with very minimal knock. Seems like quite a few people with first hand accounts with various tunes that are far worse than the factory tune for tip-in-knock.

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[Thorpedo]

Originally Posted by vtmike

TRD intake and stock tune works really well for me with very minimal knock. Seems like quite a few people with first hand accounts with various tunes that are far worse than the factory tune for tip-in-knock.

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TRD intake with stock tune is what I'm on, so we need to look at other variables like fuel and build date.

[vtmike]

Originally Posted by Thorpedo

TRD intake with stock tune is what I'm on, so we need to look at other variables like fuel and build date.

I see you mentioned 91 octane fuel, I have all 93 in my area so that could potentially be the difference.

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[Cal3000]

Originally Posted by vtmike

Logged with the tune and confirmed it would pull timing (negative knock correction value) when first giving throttle and I had the audible ping. Haven't logged with stock tune, but the noise is gone.

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What knock correction values are you getting?

[steve99]

Originally Posted by 1Cor10:23

Update 1: Haven't tried with revving not in gear (as shown in this video - not my car) but I do notice that I will get that noise when puttering around town at 2k rpm and I quickly put down some rapid throttle, makes that noise (originally thought to be mechanical) once I jab the accelerator. Most prevalent in 3rd/4th under high rapid load.

Update 2: did some logging tonight

http://www.datazap.me/u/1cor1023/dat...om=11808-12055

Freaked me out when I say IAM at 0.57 - this is VPOWER 91 in Canada. I only had about 1.5 gallons left so I filled up immediately with petrocan 94. As you can see throughout the ride in the log, IAM steadily is rising.

However, after listening carefully to see if I can spot the noise in the above video and the video below by @Thorpedo, I noticed that I can hear the noise even when I downshift rev match as I jab my accelerator.

I'd be pretty bummed if my seals were fried already - just over 6K miles, this car has seen redline perhaps 5 times and has never been tracked. Currently running OFT V1.5x

Update 3:

Found original owner of video clip with same issue (sorry didn't see this before!) Some discussion here but no resolution.

Update 4: After another afternoon of driving and cycling the 94 E10 throughout the system, IAM has come back to 1. Idle revving the car by giving it some jabs no longer makes the clicky noise, more of an intense induction/intake/suction noise - I assume this is normal.

So, what I've learned is that 91 octane being the lower edge for most OTS stage 1 tunes, it's best not to risk getting a bad batch and just go for the 93/94 with ethanol. I welcome crickets over knock any day. No more V-Power for me in Canada.

Thoughts?
Thanks!

Hi , looks like you US/Canadian guys have same issues as us with Tip in knock and High rpm knock on lower octane fuels.

If you look at his log his KC Learned (knock correction advance) is being retarded quite a lot at 5000-7000 rpm.

If you could log "Knock Correction" on your OFT next time it will show you more easily the low rpm 2000-3500 tip in knock thats dropping you IAM.

I did a bit of a write up on is here

http://www.ft86club.com/forums/showthread.php?t=61820

Your fuel formulations are different and our octane rating system is different

98RON kind of equals 93 AKI (USA)
100 RON 94 AKI

But is does appear that your fuel is slightly better.

I could always log the knock but never hear it except on stock factory tune

Basically you need to log the knock, if you see knock corrections are occurring consistently at an RPM/load point either FBKC or FLKC (you will have to calculate this if you have OFT) . Then pull about half the correction amount from the "Base timing B" table at that rpm/load point (it best to pull a bit from adjacent cells as well). ie if your seeing -1.5 knock correction values pull -0.75. flash the modded map and log again.

looks like you will have to pull timing in similar areas to us but maybe a bit more if your on 91 AKI octane fuel.

[1Cor10:23]

@steve99 thanks for that steve, I've been following your AUS-related post the past couple days as well, very insightful. I've got a few mods coming in later this month and will be going stage 2. At that point, will do the fine adjustments as you have mentioned.

[1Cor10:23]

Updated OP, thank you all for helping me out!