100 octane tune???
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Intermediate
Joined: Mar 2019
Posts: 43
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100 octane tune???
Question is why is this 100 octane tune only available for 15-16 zo6. I have a 17 does it already have tune that will take advantage of the higher octane fuel???
Last edited by Itsovr4u7; Jun 16, 2019 at 07:30 PM.
Melting Slicks
Joined: Oct 2007
Posts: 2,398
Likes: 858
17s have a slightly different tune to take advantage of some supercharger cooling improvements.
This tune is not the 100 octane tune. The 15&16s actually needed the 100 octane tune and high octane fuel to retain max power on the warmest days.
The 17s run cooler MAT's and I am not sure there is much advantage to them running the 100 octane tune.
I was able to compare 2 2017s and 1 2015. The 2015 ran about 15-20* warmer MAT's in the data logs than the 17s.
Not sure if the MAT sensor was re calibrated for the 17s but based on the logs they didn't get into the area of the tune where timing was pulled on a warm day.
Point is the 17s are more tolerant of warmer temps so they retain full power for a longer period on a hot day.
This tune is not the 100 octane tune. The 15&16s actually needed the 100 octane tune and high octane fuel to retain max power on the warmest days.
The 17s run cooler MAT's and I am not sure there is much advantage to them running the 100 octane tune.
I was able to compare 2 2017s and 1 2015. The 2015 ran about 15-20* warmer MAT's in the data logs than the 17s.
Not sure if the MAT sensor was re calibrated for the 17s but based on the logs they didn't get into the area of the tune where timing was pulled on a warm day.
Point is the 17s are more tolerant of warmer temps so they retain full power for a longer period on a hot day.
Last edited by dar02081961; Jun 18, 2019 at 05:58 PM.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida
17s have a slightly different tune to take advantage of some supercharger cooling improvements.
This tune is not the 100 octane tune. The 15&16s actually needed the 100 octane tune and high octane fuel to retain max power on the warmest days.
The 17s run cooler MAT's and I am not sure there is much advantage to them running the 100 octane tune.
I was able to compare 2 2017s and 1 2015. The 2015 ran about 15-20* warmer MAT's in the data logs than the 17s.
Not sure if the MAT sensor was re calibrated for the 17s but based on the logs they didn't get into the area of the tune where timing was pulled on a warm day.
Point is the 17s are more tolerant of warmer temps so they retain full power for a longer period on a hot day.
This tune is not the 100 octane tune. The 15&16s actually needed the 100 octane tune and high octane fuel to retain max power on the warmest days.
The 17s run cooler MAT's and I am not sure there is much advantage to them running the 100 octane tune.
I was able to compare 2 2017s and 1 2015. The 2015 ran about 15-20* warmer MAT's in the data logs than the 17s.
Not sure if the MAT sensor was re calibrated for the 17s but based on the logs they didn't get into the area of the tune where timing was pulled on a warm day.
Point is the 17s are more tolerant of warmer temps so they retain full power for a longer period on a hot day.
Drifting
Joined: Oct 2012
Posts: 1,280
Likes: 264
From: Germany
I noticed this difference in the tunes as well as some of the MAP coefficients for current and old. This change was only for the increased manifold size with the new 2017 lid and angled bricks. It was essentially just a revision to the current expected and past expected MAP values to calculate fueling and torque with throttle change. There were no changes to any spark or fueling from what I saw but as you mentioned a few of the sensors were re-scaled and likely more resilient to heat soak on a hot day. Pretty sure this was a change due to the improved heat exchanger cooling changes on the 17+ models. For the record, I was comparing a 2016 M7 Z06 to my 2017 M7 Z06.
Safety Car
Joined: Mar 2004
Posts: 4,048
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From: South Florida
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Melting Slicks
Joined: Oct 2007
Posts: 2,398
Likes: 858
Tell us more about how this is done.
The octane maps reside in the tune. How is a simple toggle switch accessing the tune and manipulating it?
Is there other hardware or firmware we are not seeing here? Please explain this technology?
Thank you
The octane maps reside in the tune. How is a simple toggle switch accessing the tune and manipulating it?
Is there other hardware or firmware we are not seeing here? Please explain this technology?
Thank you
Melting Slicks
Joined: Feb 2004
Posts: 3,131
Likes: 148
From: Sugar Land TX
I would like to know too. Back in the early days of LS1 if I remember right a resistor could be installed in the MAF line to make the MAF think the intake is cooler than it really is. And with high octane fuel probably safe.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida