Highest Octane For Stock ECU??

physics · 11-02-2019, 11:02 PM

I do notice a small difference in engine performance between the 91 octane that I normally put in my 2019 370Z with 12,000 miles and a 93 octane mixture from Sunoco SS 100 race gas and 91 octane pump gas. When I run the 93 octane blended mixture I notice that the engine idles a little more smoothly and more quietly and pulls a little more strongly from a start. With the 91 octane I sometimes get a little pinging and hesitation from a start if I don't feather the clutch correctly, none of that with the 93 octane. The most objective difference that I notice is in my longer term gas mileage indicator, where I get about a 2 mpg increase in mileage with the higher octane. The Sunoco race gas is hard to get here in Northern California and it is expensive, so I normally don't use it. My car's engine and exhaust system are still stock

Rusty · 11-03-2019, 12:05 AM

I get Sunoco 93 right out of the pump here in Pa.

old guy · 11-03-2019, 08:25 AM

Remember when Sunoco had custom blending at the pump ? You could go from 190 economy to 260 which was two notches above their 240 which was premium . You could select anything in between in increments of 10

MZ DAIZY · 11-03-2019, 10:21 AM

Quote:

Originally Posted by old guy

Remember when Sunoco had custom blending at the pump ? You could go from 190 economy to 260 which was two notches above their 240 which was premium . You could select anything in between in increments of 10

Yup, I also remember static timing, points and condensers!

Octane is not that big of a deal since the ECU made its way into cars.

physics · 11-03-2019, 10:44 PM

Quote:

Originally Posted by old guy

Remember when Sunoco had custom blending at the pump ? You could go from 190 economy to 260 which was two notches above their 240 which was premium . You could select anything in between in increments of 10

Oh yeah; the good ol days when GTOs, Roadrunners, Z28s and 442s roamed the streets.

Spooler · 11-03-2019, 10:56 PM

Quote:

Originally Posted by old guy

Remember when Sunoco had custom blending at the pump ? You could go from 190 economy to 260 which was two notches above their 240 which was premium . You could select anything in between in increments of 10

Noop, I remember fuel for under 50ct. a gallon. Self serve pumps just started being installed. Most of them were still full service. Getting the oil checked, added, etc. Front window washed.

old guy · 11-03-2019, 11:43 PM

Quote:

Originally Posted by Spooler

Noop, I remember fuel for under 50ct. a gallon. Self serve pumps just started being installed. Most of them were still full service. Getting the oil checked, added, etc. Front window washed.

That was my first paying job ( except for paper boy ) pumping gas at a full service Sunoco station. The economy grade 190 was going for 19.9ct. a gallon in 1972

Rusty · 11-04-2019, 12:55 AM

Quote:

Originally Posted by Spooler

Noop, I remember fuel for under 50ct. a gallon. Self serve pumps just started being installed. Most of them were still full service. Getting the oil checked, added, etc. Front window washed.

My first job was for Boron Oil at a gas station. I remember standing guard at the pumps with a shotgun during the 1973 gas crisis. Had cars lined up around 2 blocks.

My gas tank was always full.

11-02-2019, 11:02 PM	#106 (permalink)
physics Base Member Join Date: Jun 2011 Location: Berkeley, CA Posts: 40 Drives: 19 Nissan 370Z SC 6M Rep Power: 14	Performance Difference Between 91 and 93 Octane Fuel I do notice a small difference in engine performance between the 91 octane that I normally put in my 2019 370Z with 12,000 miles and a 93 octane mixture from Sunoco SS 100 race gas and 91 octane pump gas. When I run the 93 octane blended mixture I notice that the engine idles a little more smoothly and more quietly and pulls a little more strongly from a start. With the 91 octane I sometimes get a little pinging and hesitation from a start if I don't feather the clutch correctly, none of that with the 93 octane. The most objective difference that I notice is in my longer term gas mileage indicator, where I get about a 2 mpg increase in mileage with the higher octane. The Sunoco race gas is hard to get here in Northern California and it is expensive, so I normally don't use it. My car's engine and exhaust system are still stock __________________ Hotchkis sways, StopTech braided steel brake lines, OptiCoat Pro+ ceramic coating

11-03-2019, 12:05 AM	#107 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,170 Drives: 2011 Nismo GM 6M Rep Power: 2684437	I get Sunoco 93 right out of the pump here in Pa. physics likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

11-03-2019, 08:25 AM	#108 (permalink)
old guy A True Z Fanatic Join Date: Apr 2015 Location: S.E. Michigan Age: 68 Posts: 2,710 Drives: 13 magma touring Rep Power: 2684369	Remember when Sunoco had custom blending at the pump ? You could go from 190 economy to 260 which was two notches above their 240 which was premium . You could select anything in between in increments of 10 physics and Rusty like this. __________________ I better walk before they make me run....

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