Gas for v6? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

MagnumForceGB · 05-18-2014, 07:56 AM

Quote:

Originally Posted by Dimitrim

Preignition is caused by running premium fuel in a engine that is designed to run on low octane. The compression ration in your v-6 is too low to combust premium fuel completely. Running premium fuel will cause your ECU to pull timing because it is knocking. You will not feel this or hear this knock. This will also cause greater carbon build up in your combustion chamber.

Wow... Just wow.

I can't even begin to start with this post.

ChibiBlackSheep · 05-18-2014, 08:50 AM

You want to see what your ECM is using between the two? This alone has me using 93 octane in my LFX every fill-up.

Here are the stock 2013 LFX spark advance tables that I pulled off of my car. Just look at the insane difference between timing between high and low octane.

High Octane Timing:

Low Octane Timing:

Ambush · 05-18-2014, 10:47 AM

i don't understand how to read this chart. :/

GretchenGotGrowl · 05-18-2014, 10:58 AM

Quote:

Originally Posted by Dimitrim

Preignition is caused by running premium fuel in a engine that is designed to run on low octane.

There are lots of ways to get detonation (preignition) but this is not one of them. Higher octane is used to prevent detonation, that is why race gas is higher octane than what you buy at your local station.

Quote:

The compression ration in your v-6 is too low to combust premium fuel completely.

The V6 runs HIGHER compression than the LS3 and L99 V8s. That's a very easy thing look up!

Quote:

Running premium fuel will cause your ECU to pull timing because it is knocking.

Wrong, the ECU pulls timing when it sees (hears) knock. You get less knock with higher octane gas.

Quote:

You will not feel this or hear this knock.

This is the only correct statement in the whole post and it assumes the knock sensors are working correctly.

Quote:

This will also cause greater carbon build up in your combustion chamber.

What are you basing this on?

GretchenGotGrowl · 05-18-2014, 11:02 AM

Quote:

Originally Posted by Ambush

i don't understand how to read this chart. :/

The numbers in each cell are the commanded degrees of spark advance. The rows are different amounts of air the MAF is detecting (low to high) and the columns are the RPMs. If you compare the individual cells for the top (high octane MAP) to the bottom (low octane MAP) tables you will see the commanded spark advance is higher for the high octane map. Generally, more timing means more power.

skibik · 05-18-2014, 11:14 AM

Burn what you feel like spending your money on. According to the manual we are required to run 87 octane minimum. I run 87 as that is what is readily available here and runs without any problems in my car. It may be closer price wise now but last year or year before I tried a tank or two of 91 and the price difference then was $.50 to $.60 a gallon difference. As far as feeling the difference in them by the ass dyno there was no difference to me. I think you would have to put it on an actual dyno to tell the difference in HP between the two fuels. At 14 to 15 gallon fill that is about $8 and I would rather take that and go eat at the local drive in with that instead. JMO!

Dean.

ChibiBlackSheep · 05-18-2014, 12:18 PM

Quote:

Originally Posted by Ambush

i don't understand how to read this chart. :/

Quote:

Originally Posted by GretchenGotGrowl

The numbers in each cell are the commanded degrees of spark advance. The rows are different amounts of air the MAF is detecting (low to high) and the columns are the RPMs. If you compare the individual cells for the top (high octane MAP) to the bottom (low octane MAP) tables you will see the commanded spark advance is higher for the high octane map. Generally, more timing means more power.

Correct. When you are working with timing, typically higher means more power. In this case we are looking at almost 20* of timing change between low and high octane.

That is quite a huge difference and shows just how effective higher octane is in these engines.

jd10013 · 05-18-2014, 12:25 PM

Quote:

Originally Posted by skibik

Burn what you feel like spending your money on. According to the manual we are required to run 87 octane minimum.

Dean.

no, your required to run a gas with a minimum of 87. kind of funny how you'll put all those performance parts on your car then go the lowest required grade of gas.

SimpleGreen · 05-18-2014, 12:28 PM

I ran 93 in my V6 car from day 1 when I picked it up with 14 miles on the clock. The high compression ratio alone made me figure it was worth it. It was probably $5 more a tank I guess? Filled up three times a month or so. I didn't miss the $15.

My SS, needless to say, is running 93 as well.

stevey_frac · 05-18-2014, 02:35 PM

Quote:

Originally Posted by ChibiBlackSheep

You want to see what your ECM is using between the two? This alone has me using 93 octane in my LFX every fill-up.

Here are the stock 2013 LFX spark advance tables that I pulled off of my car. Just look at the insane difference between timing between high and low octane.

High Octane Timing:

Low Octane Timing:

That's fascinating... Great post by the way. Can anyone corroborate this for the LLT?

ChibiBlackSheep · 05-18-2014, 02:40 PM

I would imagine it is very similar to the LLT. Although I have never had my HPT hooked up to one.

BFella · 05-18-2014, 02:43 PM

Dealership ALWAYS recommends 87 for the V6, not sure about the V8's. V6's only process 87 the best, anything else is either a waste, or harmful.

jd10013 · 05-18-2014, 02:53 PM

Quote:

Originally Posted by BFella

Dealership ALWAYS recommends 87 for the V6, not sure about the V8's. V6's only process 87 the best, anything else is either a waste, or harmful.

lol, so your position despite the fact the dyno chart on the previous page proves everything you just said wrong? did you not read the thread, or just real weak at the reading comprehension?

MBS · 05-18-2014, 03:01 PM

Quote:

Originally Posted by GretchenGotGrowl

There are lots of ways to get detonation (preignition) but this is not one of them. Higher octane is used to prevent detonation, that is why race gas is higher octane than what you buy at your local station.

The V6 runs HIGHER compression than the LS3 and L99 V8s. That's a very easy thing look up!

Wrong, the ECU pulls timing when it sees (hears) knock. You get less knock with higher octane gas.

This is the only correct statement in the whole post and it assumes the knock sensors are working correctly.

What are you basing this on?

The master of the 6 cyl posts this , then the very next page a guy says his dealers say run 87 anything more is just a waste.

. charts proving the difference and a guy who knows the V6 better than the guy who built it . Man Some people just are

Thanks for the posts Gretchen,

05-18-2014, 08:50 AM	#16
ChibiBlackSheep Drives: 2012 2SS/RS, 1968 SS Join Date: Feb 2012 Location: Southeast, PA Posts: 2,093	You want to see what your ECM is using between the two? This alone has me using 93 octane in my LFX every fill-up. Here are the stock 2013 LFX spark advance tables that I pulled off of my car. Just look at the insane difference between timing between high and low octane. High Octane Timing: Low Octane Timing: __________________ LS3 Crate Engine Swap \| CSP Custom Cam 232/240 .615/.615 113 +3 \| Stainless Power LT Headers \| Z28 Intake \| Borla S-Type Exhaust \| FTI Triple-Disc Billet 3200 Stall 2012 Camaro 2SS/RS \| 1968 Camaro SS \| 2020 Cadillac CT5 Premium Luxury \| 2021 Spark LS

05-18-2014, 10:47 AM	#17
Ambush Rawr! Drives: Giulia Quadrifoglio, C8 Stingray Join Date: Sep 2013 Location: New Orleans, LA Posts: 351	i don't understand how to read this chart. :/ __________________ Current: 2023 Red Mist Corvette Stingray 2LT 2021 Trofeo White Alfa Romeo Giulia Quadrifoglio Retired: 2018 Garnet Red Camaro 2SS 2014 Crystal Red Camaro RS

05-18-2014, 12:28 PM	#23
SimpleGreen Drives: 2015 2SS/RS Join Date: Apr 2012 Location: Southeast Louisiana Posts: 2,112	I ran 93 in my V6 car from day 1 when I picked it up with 14 miles on the clock. The high compression ratio alone made me figure it was worth it. It was probably $5 more a tank I guess? Filled up three times a month or so. I didn't miss the $15. My SS, needless to say, is running 93 as well. __________________ 2015 Camaro 2SS/RS SIM 2016 Jeep Wrangler 2DR Willys Wheeler 1993 C1500 Single Cab Stepside 5.3L LS Swap

05-18-2014, 02:40 PM	#25
ChibiBlackSheep Drives: 2012 2SS/RS, 1968 SS Join Date: Feb 2012 Location: Southeast, PA Posts: 2,093	I would imagine it is very similar to the LLT. Although I have never had my HPT hooked up to one. __________________ LS3 Crate Engine Swap \| CSP Custom Cam 232/240 .615/.615 113 +3 \| Stainless Power LT Headers \| Z28 Intake \| Borla S-Type Exhaust \| FTI Triple-Disc Billet 3200 Stall 2012 Camaro 2SS/RS \| 1968 Camaro SS \| 2020 Cadillac CT5 Premium Luxury \| 2021 Spark LS

05-18-2014, 11:14 AM	#20
skibik Guest Drives: bbbbbb Join Date: Dec 2012 Location: bfe Posts: 713	Burn what you feel like spending your money on. According to the manual we are required to run 87 octane minimum. I run 87 as that is what is readily available here and runs without any problems in my car. It may be closer price wise now but last year or year before I tried a tank or two of 91 and the price difference then was $.50 to $.60 a gallon difference. As far as feeling the difference in them by the ass dyno there was no difference to me. I think you would have to put it on an actual dyno to tell the difference in HP between the two fuels. At 14 to 15 gallon fill that is about $8 and I would rather take that and go eat at the local drive in with that instead. JMO! Dean.

05-18-2014, 02:43 PM	#26
BFella Drives: 16' Supercharged 1SS Join Date: Apr 2014 Location: Scottsdale, AZ Posts: 650	Dealership ALWAYS recommends 87 for the V6, not sure about the V8's. V6's only process 87 the best, anything else is either a waste, or harmful.