AEM EMS Knock Voltage Reading - 3000GT/Stealth International Message Center

stealth-TwnTrbo · 05-02-2008, 01:50 PM

On my logs i am seeing knock voltage about 0.5 volts what is severe knock or to much knock?? I was told real knock was only over 1.5 or high anything less than that on the AEM is just noise, does anybody know what real knock is based on voltage on the AEM.

Dj4play · 05-02-2008, 05:30 PM

Quote:

Originally Posted by stealth-TwnTrbo

On my logs i am seeing knock voltage about 0.5 volts what is severe knock or to much knock?? I was told real knock was only over 1.5 or high anything less than that on the AEM is just noise, does anybody know what real knock is based on voltage on the AEM.

2 volts is about where you need to watch what your doing. What your experiencing is just noise. UNLESS you have solid mounts, your "noise" should always be under .75 volts or thereabouts.

niterydr · 05-02-2008, 08:03 PM

Quote:

Originally Posted by stealth-TwnTrbo

On my logs i am seeing knock voltage about 0.5 volts what is severe knock or to much knock?? I was told real knock was only over 1.5 or high anything less than that on the AEM is just noise, does anybody know what real knock is based on voltage on the AEM.

Typically the 3s displays under 1.5V's of knock threshold voltage.

However any sharp spikes or inclines could be real knock. What is the current state of your tune? How much boost and ignition timing? What is your pick/delay comp and ignition sync at?

The knock voltage and knock raw #1 should ramp up with a steady increase in rpm.

stealth-TwnTrbo · 05-03-2008, 08:42 PM

My car was tuned and is good, it made good power A/F's in the mid 11.3-11.6 timing is at 21 degrees at 7k boost is about 17 psi. I was just playin with the boost and watching knock but im only getting 0.5 max on the knock voltage, what is considered dangerous voltage ?? 1.75v - 2.25v???

maTT · 05-03-2008, 10:21 PM

Your knock volts is dependant on your knock cal table. If your knock control is on then the knock volts = knock raw - knock cal table. Have you made a knock cal specific to your engine? Is your knock control turned on?

niterydr · 05-04-2008, 02:35 PM

Like Matt says, that is dependant upon your knock cal table.
Do you have a file or log you can post?

Import Power · 05-04-2008, 03:10 PM

Quote:

Originally Posted by Dj4play

2 volts is about where you need to watch what your doing. What your experiencing is just noise. UNLESS you have solid mounts, your "noise" should always be under .75 volts or thereabouts.

Are you saying 2 volts Knock #1 ABOVE your Knock Raw volts?
Or 2 volts Knock Raw?

And are you saying "Noise", Knock Raw should be under .75 volts? Cause noise would be noise without knock, and .75 volts noise (knock raw during knock cal runs no boost low timing) is a damn quiet engine. Quiter than any 3S I have done a knock cal on.

Personally, and I know this leaves some power on the table (where is this damn table everyone leaves power on anyway?) I run the knock cal run, no boost low timing 93 pump. Add 20% even though I have seen 25% is allowed, make that my knock cal map, then when I seen ANY blips of Knock #1 volts I adjust the timing so the runs are dead quiet. Not one spec above the cal table. I know it's leaving power down but I play it safe.

Import Power · 05-04-2008, 04:12 PM

And how do you guys do a knock cal run? No boost (open WGs) or low (WG pressure) and low timing?
2nd or 3rd gear?

stealth-TwnTrbo · 05-05-2008, 07:38 AM

Yea i will post a log later today of 2nd and third gear, i had my car tuned at IPS and knock control is enabled. I'll post logs later this afternoon.

Import Power · 05-13-2008, 06:54 AM

logs???

05-02-2008, 01:50 PM	#1 (permalink)
stealth-TwnTrbo Forum Member Join Date: Nov 2005 Location: Ann Arbor, MI Drives: 92 Stealth TT 400WHP Trader Rating: (1)	AEM EMS Knock Voltage Reading On my logs i am seeing knock voltage about 0.5 volts what is severe knock or to much knock?? I was told real knock was only over 1.5 or high anything less than that on the AEM is just noise, does anybody know what real knock is based on voltage on the AEM. __________________ 92 Stealth R/T TT CurrentMODS: K&N FIPK Ultimate Performance Short Throw HKS Turbo Timer Type-1 Greddy Profec B Spec II Greddy Type S GEN 3 Lifters 3sx Crank Pulley Accel 8.0mm Wires Denso IK24's .032 Borla Catback Stillen Downpipe no Cats + Gutted Rear Pre-Cat Denso Supra Pump Hotwired AEM FPR @ 46 psi + RobBecks Fuel Rail Adapter PST 2 Piece Hybrid Aluminum Driveshaft Aeroquip Fuel Rail Loop Adapter 680cc PTE's AEM EMS AEM Wideband 02 Vibrant Performance FMIC Core Custom Piping 2 x TD04 15G's W/ HL Exhaust Wheel 395 AWHP @ 16 PSI on 93 405 AWTQ. Stopping: Stillen Front and Rear Cross Drilled Rotors Stock Arctic Cat F-7 World Record Holder on Grass 500FT 5.313 ET @ 90.92 MPH

05-03-2008, 08:42 PM	#4 (permalink)
stealth-TwnTrbo Forum Member Join Date: Nov 2005 Location: Ann Arbor, MI Drives: 92 Stealth TT 400WHP Trader Rating: (1)	Re: AEM EMS Knock Voltage Reading My car was tuned and is good, it made good power A/F's in the mid 11.3-11.6 timing is at 21 degrees at 7k boost is about 17 psi. I was just playin with the boost and watching knock but im only getting 0.5 max on the knock voltage, what is considered dangerous voltage ?? 1.75v - 2.25v???

05-03-2008, 10:21 PM	#5 (permalink)
maTT Panda Master Join Date: Sep 1999 Location: Charlotte, NC Drives: In place @ 200 Trader Rating: (17)	Re: AEM EMS Knock Voltage Reading Your knock volts is dependant on your knock cal table. If your knock control is on then the knock volts = knock raw - knock cal table. Have you made a knock cal specific to your engine? Is your knock control turned on? __________________ www.3sx.com 1992 VR4 - Sold - 12.5@110 1991 SL - Sold - 16.5@85 1993 RT/TT - Sold - 11.44@129.3 1992 VR4 - Sold 1994 VR4 - Sold 1993 SL - Retired - 10.19@140 1991 VR4 - Retired - 9.21@159 1993 VR4 - Sold 1992 Base Stealth ATX - DOHC TT

05-04-2008, 02:35 PM	#6 (permalink)
niterydr New project in the works Join Date: May 2003 Location: Maple Grove, MN Drives: Tractionless wonder Trader Rating: (33)	Re: AEM EMS Knock Voltage Reading Like Matt says, that is dependant upon your knock cal table. Do you have a file or log you can post?

05-04-2008, 04:12 PM	#8 (permalink)
Import Power Play that Funky Music Join Date: Jan 2002 Location: Behind the Wheel Drives: Vicki Insane Trader Rating: (209)	Re: AEM EMS Knock Voltage Reading And how do you guys do a knock cal run? No boost (open WGs) or low (WG pressure) and low timing? 2nd or 3rd gear?

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05-05-2008, 07:38 AM	#9 (permalink)
stealth-TwnTrbo Forum Member Join Date: Nov 2005 Location: Ann Arbor, MI Drives: 92 Stealth TT 400WHP Trader Rating: (1)	Re: AEM EMS Knock Voltage Reading Yea i will post a log later today of 2nd and third gear, i had my car tuned at IPS and knock control is enabled. I'll post logs later this afternoon.

05-13-2008, 06:54 AM	#10 (permalink)
Import Power Play that Funky Music Join Date: Jan 2002 Location: Behind the Wheel Drives: Vicki Insane Trader Rating: (209)	Re: AEM EMS Knock Voltage Reading logs???