Limits of 92 octane?

braydo25 · 06-08-2018, 10:38 PM

Fixed.

SG4247 · 06-08-2018, 11:26 PM

Not boosted, but this might help.

On my NA “stock” motor I saw knock with 92 and 94 octane. I thought it was phantom knock signal. So, just to verify, I swapped the tune to E85 logged some pulls. I had the exact same knock signals at the top of 3rd and middle of fourth at WOT just like the logs on gas.

This convinced me that it was mechanical noise, and so we reduced the sensor sensitivity for all maps.

I kept the knock detection active, and have not seen any knock correction since.

Seems like knock detection will go off at 5 degrees of retard or more with Ecutek.

braydo25 · 06-09-2018, 12:02 AM

This is interesting. I'm seeing "ignition correction" in the exact same spots on the log - it seems primarily right around the 4,500rpm to 6,000rpm mark for 3rd gear pulls.

We are going to try the same tune with 101 octane and see if it changes. If it doesn't we're going to assume it's mechanical noise. We're seeing -1* to -2* of correction, but we're moreso trying to be safe than anything.

bikeking · 06-09-2018, 12:59 AM

Ran into the same issue and we had to turn off multiple misfire detection, as we increased timing it would do just as you said, once we turned that off everything was fine. We left single cylinder misfire detection on.

Sent from my iPhone using Tapatalk

ByThaBay · 06-13-2018, 06:12 AM

A better way to verify is to turn down the timing where the car is having corrections and check to see if it helps. An even better way is to analyze the knock data per cylinder to see which/what if breaking the knock threshold.

Baronsmokes · 06-13-2018, 08:32 AM

Quote:

Originally Posted by braydo25

This is interesting. I'm seeing "ignition correction" in the exact same spots on the log - it seems primarily right around the 4,500rpm to 6,000rpm mark for 3rd gear pulls.

We are going to try the same tune with 101 octane and see if it changes. If it doesn't we're going to assume it's mechanical noise. We're seeing -1* to -2* of correction, but we're moreso trying to be safe than anything.

Any update on this?

Elmo370z · 06-14-2018, 06:05 PM

I have the same issue with my car.

ByThaBay · 06-15-2018, 10:54 PM

Quote:

Originally Posted by Elmo370z

I have the same issue with my car.

I am willing to do some free evaluations if anyone wants help hunting this down. You should already have an ecutek license installed. If you don't I can provide you with one.

06-08-2018, 10:38 PM	#1 (permalink)
braydo25 Base Member Join Date: Apr 2012 Location: Tacoma Posts: 67 Drives: Nismo z34 Rep Power: 13	Limits of 92 octane? Fixed. Last edited by braydo25; 05-05-2019 at 03:50 PM.

06-09-2018, 12:02 AM	#3 (permalink)
braydo25 Base Member Join Date: Apr 2012 Location: Tacoma Posts: 67 Drives: Nismo z34 Rep Power: 13	This is interesting. I'm seeing "ignition correction" in the exact same spots on the log - it seems primarily right around the 4,500rpm to 6,000rpm mark for 3rd gear pulls. We are going to try the same tune with 101 octane and see if it changes. If it doesn't we're going to assume it's mechanical noise. We're seeing -1* to -2* of correction, but we're moreso trying to be safe than anything. Baronsmokes and Zakie_Chan like this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
No Speed Limits ...	BGTV8	Other Vehicles	3	07-19-2016 09:30 AM
Gear Calculations and Rev Limits	daj349	Tuning	8	10-07-2015 10:38 AM
Stock Maf Limits	Mitco39	Forced Induction	143	11-01-2014 12:02 PM
E10 94 octane vs. Shell V-Power 91 octane ethanol-free	semtex	Engine & Drivetrain	15	09-16-2011 11:19 PM
370Z "Off-Limits" at Chicago AutoShow	speed_BMW330i	Nissan 370Z General Discussions	16	02-16-2010 11:32 PM

06-08-2018, 11:26 PM	#2 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 786 Drives: 2010 touring Rep Power: 7842	Not boosted, but this might help. On my NA “stock” motor I saw knock with 92 and 94 octane. I thought it was phantom knock signal. So, just to verify, I swapped the tune to E85 logged some pulls. I had the exact same knock signals at the top of 3rd and middle of fourth at WOT just like the logs on gas. This convinced me that it was mechanical noise, and so we reduced the sensor sensitivity for all maps. I kept the knock detection active, and have not seen any knock correction since. Seems like knock detection will go off at 5 degrees of retard or more with Ecutek.

06-09-2018, 12:59 AM	#4 (permalink)
bikeking Base Member Join Date: Oct 2012 Location: alberta Posts: 35 Drives: 09 nissan 370z bl m6 Rep Power: 13	Ran into the same issue and we had to turn off multiple misfire detection, as we increased timing it would do just as you said, once we turned that off everything was fine. We left single cylinder misfire detection on. Sent from my iPhone using Tapatalk

06-13-2018, 06:12 AM	#5 (permalink)
ByThaBay Base Member Join Date: Aug 2011 Location: Bay Area, CA Posts: 239 Drives: 2015 370z Rep Power: 10080	A better way to verify is to turn down the timing where the car is having corrections and check to see if it helps. An even better way is to analyze the knock data per cylinder to see which/what if breaking the knock threshold.

06-14-2018, 06:05 PM	#7 (permalink)
Elmo370z A True Z Fanatic Join Date: Apr 2013 Location: st. petersburg Posts: 5,709 Drives: 09 nissan 370z Sp M6 Rep Power: 295378	I have the same issue with my car.