Aces IV additive/octane enhancer

[Hazmat SRT]

It is possible they use different values from the stock strategy that ford uses. Either way if the knock goes into positive numbers the ECU considers this a very big problem and aggressively limits ignition performance. The system pushing up the timing until knock the ECU knows why the knock is happening. If it sees too much knock or too intense it will slow down the advance or pull as appropriate. Any other time there's knock where there shouldnt be and while it's not doing this it goes to aggressive knock reduction mode.

This is really good info. Thanks for posting this.

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[Roh92cp]

It is possible they use different values from the stock strategy that ford uses. Either way if the knock goes into positive numbers the ECU considers this a very big problem and aggressively limits ignition performance. The system pushing up the timing until knock the ECU knows why the knock is happening. If it sees too much knock or too intense it will slow down the advance or pull as appropriate. Any other time there's knock where there shouldnt be and while it's not doing this it goes to aggressive knock reduction mode.

I reached out to Whipple again asking further about their borderline knock threshold, and at what knock value it starts reducing knock aggressively. I'll LUK when I get a response.

Whipple assured me that the normal or borderline knock logic that maximizes timing for power is in the 2 degree range. Beyond 2 is when and power is reduced significantly.

 

[Stage_3]

Here's a great video on knock sensors.

[ame]​

 

[TheHydro]

I hope something gets worked out with this stuff. I'm running a whipple on the stock pulley with top tier 91 and had almost 5 degrees of positive knock on a pull today.

 

[Roh92cp]

I hope something gets worked out with this stuff. I'm running a whipple on the stock pulley with top tier 91 and had almost 5 degrees of positive knock on a pull today.

Yeah that's too much according to Will at Whipple. He just told me that 4-5 degrees knock over time can hurt the motor.

What pulley are you running?

 

[TheHydro]

The stock one, 3.75 I believe

 

[Roh92cp]

The stock one, 3.75 I believe

Ouch that's not good on a 3.75" I'm wondering if you got bad gas. You ever try Shell 91, I know Brain at BND recommends it. If you try new gas and keep getting that much knock I would contact Whipple.

 

[TheHydro]

I'll try shell out. I have always ran chevron in the car since I bought it and usually from the same two stations. I just got the ngauge recently so I just started monitoring this stuff and watching this thread.

 

[Roh92cp]

Here's a great video on knock sensors.

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Yes this is a good video thanks, and was posted here 2 pages back.

 

[Stage_3]

Yes this is a good video thanks, and was posted here 2 pages back.

Whoops. Sorry bud.

 

[Bartly]

I hope something gets worked out with this stuff. I'm running a whipple on the stock pulley with top tier 91 and had almost 5 degrees of positive knock on a pull today.

Dude, I'm in the same boat, tried all the good stations and brands of gas. I'm starting to get convinced anyone limited to 91 octane is going to see the same thing. Just nobody talking about it. Heck hardly anyone has mentioned what knock they see with 93, but sounds like fairly often it's more than 2-3*. I keep thinking it's the big compression motor, guessing its why they sell the lower compression version of the Coyote.

 

[Roh92cp]

Dude, I'm in the same boat, tried all the good stations and brands of gas. I'm starting to get convinced anyone limited to 91 octane is going to see the same thing. Just nobody talking about it. Heck hardly anyone has mentioned what knock they see with 93, but sounds like fairly often it's more than 2-3*. I keep thinking it's the big compression motor, guessing its why they sell the lower compression version of the Coyote.

Well on my 93 I see 1.5-2 positive knock with the 3.625" pulley. I no longer have the 3.75" to test out.

 

[TheHydro]

I'm sure the 115 degree heat we have around the corner isn't going to help my matters any. I rather have my car run more conservative than try to squeeze every last horsepower out, hell I can't even hook up in third gear.

 

[Bartly]

Well on my 93 I see 1.5-2 positive knock with the 3.625" pulley. I no longer have the 3.75" to test out.

I'd be happy to see that. I just re-read your post and see the 4.74 degrees in your pic was with the 3.5" pulley. Wishing my Procharger would have come with a bigger pulley since I was up front that I only have access to 91 octane.

 

[Roh92cp]

Sorry for the crappy video quality when I down loaded it it degraded a lot. Knocker is bottom right and when the digits turn yellow it's in positive knock. Boost was 11 psi timing advance around 18 ish and positive knock 1.65. Funny thing was in some runs it would have 0 knock in third gear, most knock was in 4th.

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