Official Redline SI-1 thread.

[Wild one]

Interesting, indeed!

Here's my $0.02 (and some real-world, too) on lower octane, especially in the summer high heat times of year.

Using regular 87 and smashing the go-stick and holding it to the floor through the first few gears until I'm at 120km/h to 140km/h, especially in the summer months when the heat is high (A/C on only amplifies it more)...there is a very apparent spark-knock / engine-knock sound.

(89 is a complete farce and not worth using IMPO!).

Migrating to 91 and doing the same, it's intermittent. When it does knock, it's mild.

Using 94 and 93...ZERO knock whatsoever (A/C on or not, and going up a steep hill and smashing it, too).
And, my HEMI is zippier as well.

I only use the 94/93 when I use the two bottles of SI-1, and again, it's only a max of a couple of times a year.
All other times I only use 91. Although the 91 Shell runs the best whereas 91 Costco not as good. All top-tier branded fuels though.

You all know the oil & filter I use, so it's only quality product.
I remove the TB and thoroughly service it twice a year as well as remove the PCV valve and do the same, too.

My engine air filter is changed out every 6-months (using the OEM 6.4/ECO air filter with the bigger lower air box and intake horn mod) and a Legmaker mid-tube upgrade with the IAT located in the center of the air intake horn in front of the airbox assembly).

My spark plugs are changed every 60,000Km's or so as well.

My HEMI is well maintained, but well driven!

The A/C won't affect full throttle,as it shuts off the compressor when you have the skinny pedal pushed through the floor.

 

[Wild one]

This is what redline says...

Cleans injectors, carburetors, valve and combustion chamber deposits with a concentrated blend of the most powerful high-temp and low-temp detergents available

• Cleans all forms of fuel injectors, including GDI
• Enhances fuel stability; reduces gum and varnish formation
• Use one bottle per tank for most effective treatment, cleans to nearly 100% efficiency in one treatment
• Reduces need for octane by up to two points
• Contains synthetic upper cylinder lubricant
• Cleans pollution control valves
• Suitable for use with oxygenated fuel
• Safe for continual use

So I wonder what they mean, I wonder if you actually have a lower octane for use, or it is just bs speak, dunno. What you can do is next time try a lower octane fuel and only do 1/2 a tank with one bottle, same mix rate as you have now. Then it will either be worse, better, or the same. Then you can adjust even with octane boost if needed as in it got worse. But I never heard anyone using 94 octane in a stock 5.7. Lots to digest here, but also this is a known issue with heavy dose. Seams like about 1/2 the bottle is oil, so adding two bottles is like adding about 16 ounces oil to gas. Now, could this be the source of hesitation? possibly?

.

The way i'm reading that,is it gets rid of the carbon deposits that can lead to hot spots and pre-ignition,so you can run a lower octane fuel with out pre-ignition rearing it's ugly head,after the treatment

 

[CanuckRam1313]

The A/C won't affect full throttle,as it shuts off the compressor when you have the skinny pedal pushed through the floor.

Wasn't aware of that... always learning something new here from y'all!!!

Maybe that's why it's never as cold as it could be in my truck during the summer months...lol.
I'm always smashing the skinny pedal

 

[Wild one]

Wasn't aware of that... always learning something new here from y'all!!!

Maybe that's why it's never as cold as it could be in my truck during the summer months...lol.
I'm always smashing the skinny pedal

Out here we've needed the heater more this summer then the A/C,todays high is all of 11C,and they were saying there could be snow in the rock pile just west of me,above 2,000 meters,lol.Supposed to get back up to 22C tomorrow,then 27C on Thursday,then it cools back off with more rain.Apparently we've had double the normal amount of rain for July,i can tell,my flipping lawn has been growing way more then i want,lol

 

[CanuckRam1313]

Out here we've needed the heater more this summer then the A/C,todays high is all of 11C,and they were saying there could be snow in the rock pile just west of me,above 2,000 meters,lol.Supposed to get back up to 22C tomorrow,then 27C on Thursday,then it cools back off with more rain.Apparently we've had double the normal amount of rain for July,i can tell,my flipping lawn has been growing way more then i want,lol

My "field crop" has also been growing more this year, too... the humidity and rain mixed with incredible sun has been great

My A/C in my home and truck has been working overtime as we've had some darn near 50deg/c temps (averaging 40+, more than not over the last 6 weeks or so with the heat and humidex readings).

 

[Wild one]

My "field crop" has also been growing more this year, too... the humidity and rain mixed with incredible sun has been great

My A/C in my home and truck has been working overtime as we've had some darn near 50deg/c temps (averaging 40+, more than not over the last 6 weeks or so with the heat and humidex readings).

We've also been relatively smoke free this summer down here.Northern Alberta has been way hotter then we have down south,and they're contending with alot more smoke then we are.They need rain up there,and haven't been getting it,while Calgary has been getting more then we need

 

[HEMIMANN]

The way i'm reading that,is it gets rid of the carbon deposits that can lead to hot spots and pre-ignition,so you can run a lower octane fuel with out pre-ignition rearing it's ugly head,after the treatment

Exactly.

But it takes you back to the recommended octane rating in the Owner's Manual - i.e., it removes the bandaid of higher octane gas for old, carboned cylinders on engines without active spark knock control.

And even WITH spark knock control, the ECM algorithm for it isn't desirable anyway - a member took ECM data to prove that the algo ALLOWS knocking cycles before determing whether to r e t a r d ignition. i.e. - the algo is PRE-SET TO HIGHEST RECOMMENDED OCTANE (for Hemi's that is 89 R+M). Being a purest, I run the high pump octane (whatever is available, some are 91, some 92, some 93 - no idea why). Because 89 is a BLEND of 87 & high octane.

No thanks.

Keep them motors clean and use the right octane rating!

 

[Curmudgeon]

Exactly.

But it takes you back to the recommended octane rating in the Owner's Manual - i.e., it removes the bandaid of higher octane gas for old, carboned cylinders on engines without active spark knock control.

And even WITH spark knock control, the ECM algorithm for it isn't desirable anyway - a member took ECM data to prove that the algo ALLOWS knocking cycles before determing whether to r e t a r d ignition. i.e. - the algo is PRE-SET TO HIGHEST RECOMMENDED OCTANE (for Hemi's that is 89 R+M). Being a purest, I run the high pump octane (whatever is available, some are 91, some 92, some 93 - no idea why). Because 89 is a BLEND of 87 & high octane.

No thanks.

Keep them motors clean and use the right octane rating!

If 89 is a blend, and I'm at a pump with 87, 89, 91, and 93, which are the blends?
If 89 is a blend of 87/91, yet 93 is almost common, wouldn't 91 also be a blend?
Or is it simply dependent on what is available at a given pump/station?

I guess I'm wondering where the blending occurs? I've been running 89 mainly because that is what the manual calls for, and folks who know a lot more than I do have suggested that any other octane forces the engine's module (ECU?) to adjust around the 87/91/93, etc.

I also have easy access to 90 octane non-ethanol gas, but I don't know what additives it has, if that gas has any additives at all.
So 89 Top Tier, typically Sunoco.

 

[CanuckRam1313]

If 89 is a blend, and I'm at a pump with 87, 89, 91, and 93, which are the blends?
If 89 is a blend of 87/91, yet 93 is almost common, wouldn't 91 also be a blend?
Or is it simply dependent on what is available at a given pump/station?

I guess I'm wondering where the blending occurs? I've been running 89 mainly because that is what the manual calls for, and folks who know a lot more than I do have suggested that any other octane forces the engine's module (ECU?) to adjust around the 87/91/93, etc.

I also have easy access to 90 octane non-ethanol gas, but I don't know what additives it has, if that gas has any additives at all.
So 89 Top Tier, typically Sunoco.

Those smarter than I will chime in regarding the mixology of anything higher than 91.

However, 89 has been and always will be (to me, anyways) the biggest farce of a fuel blend ever given to the consumer because it's mixed at the pump with 87 and 91.

For the few cents more, just go with the 91.

 

[Curmudgeon]

Those smarter than I will chime in regarding the mixology of anything higher than 91.

However, 89 has been and always will be (to me, anyways) the biggest farce of a fuel blend ever given to the consumer because it's mixed at the pump with 87 and 91.

For the few cents more, just go with the 91.

Thanks.

I've tried multiple tanks of 91 and 93 and saw/felt no difference, but I suspected the ECU was adjusting. But if 91 is better, it's probably better in the long run, not something my butt-dyno can measure, and I'm happy to run good stuff.

 

[HEMIMANN]

If 89 is a blend, and I'm at a pump with 87, 89, 91, and 93, which are the blends?
If 89 is a blend of 87/91, yet 93 is almost common, wouldn't 91 also be a blend?
Or is it simply dependent on what is available at a given pump/station?

I guess I'm wondering where the blending occurs? I've been running 89 mainly because that is what the manual calls for, and folks who know a lot more than I do have suggested that any other octane forces the engine's module (ECU?) to adjust around the 87/91/93, etc.

I also have easy access to 90 octane non-ethanol gas, but I don't know what additives it has, if that gas has any additives at all.
So 89 Top Tier, typically Sunoco.

It is dependent on what is available at any given refinery region.

In Twin Cities we pull from Koch Rosemount and Marathon St. Paul. Whatever they make, we get. Octane blending and additives are done at the tank farm terminals.

The tank trucks punch in the codes for the brand they are supplying and the mixer does the rest - including whether more cleaning additives are added for top tier stations.

 

[Wild one]

I talk to the local tanker driver every once inawhile at my local Petro Canada,and according to him,he only delivers 87 and 94,and the rest like 89/91 are mixed at the pump.Whether that's right or not i don't know,but he's the only driver i've seen delivering fuel to that station,and i'd hope he knew what he was dropping into the underground tanks.

 

[HEMIMANN]

I talk to the local tanker driver every once inawhile at my local Petro Canada,and according to him,he only delivers 87 and 94,and the rest like 89/91 are mixed at the pump.Whether that's right or not i don't know,but he's the only driver i've seen delivering fuel to that station,and i'd hope he knew what he was dropping into the underground tanks.

I just assumed the ninety-whatever octane rating down here was the top pure gas (short of av gas) because I don't se any other ninety octane ratings anywhere around the Koch/Marathon refinery supply region.

Do you see 94 octane pumps up there? Av gas is 100 or 100 octane, if memory serves.

 

[Wild one]

I just assumed the ninety-whatever octane rating down here was the top pure gas (short of av gas) because I don't se any other ninety octane ratings anywhere around the Koch/Marathon refinery supply region.

Do you see 94 octane pumps up there? Av gas is 100 or 100 octane, if memory serves.

Yup we have 93 and 94 and they're fairly common at alot of stations.I used to run Av Gas in my old toys,but that was back when i could drive a car to the smaller local airport pumps,you can't do that anymore.
Avgas was dry as hell though,and was hard on carb gaskets and needles and seats.It wasn't uncommon to be putting new needles and seats in holley carbs on a yearly basis if you were running Avgas. I used to buy 110/130 Avgas back then,i'm not sure what that'd be in todays AvGas as that was 30+ years ago

 

[HEMIMANN]

Yup we have 93 and 94 and they're fairly common at alot of stations.I used to run Av Gas in my old toys,but that was back when i could drive a car to the smaller local airport pumps,you can't do that anymore.
Avgas was dry as hell though,and was hard on carb gaskets and needles and seats.It wasn't uncommon to be putting new needles and seats in holley carbs on a yearly basis if you were running Avgas. I used to buy 110/130 Avgas back then,i'm not sure what that'd be in todays AvGas as that was 30+ years ago

Down here in bribe country, we got 91 with state law 10% minimum ethanol.

East in Wisconsin they got 92 or 93 octane. All gas is available without any alcohol, either - different refinery region, Mobil Joliet Refinery. The last new one built here - in 1971!

Fuels suck here in Minnesota. All bribery.

 

[Wild one]

Down here in bribe country, we got 91 with state law 10% minimum ethanol.

East in Wisconsin they got 92 or 93 octane. All gas is available without any alcohol, either - different refinery region, Mobil Joliet Refinery. The last new one built here - in 1971!

Fuels suck here in Minnesota. All bribery.

That's one thing we can't get is ethanol free gas anymore,our Canuck a s s h o l e s in Ottawa made sure of that several years ago

 

[CanuckRam1313]

Thanks.

I've tried multiple tanks of 91 and 93 and saw/felt no difference, but I suspected the ECU was adjusting. But if 91 is better, it's probably better in the long run, not something my butt-dyno can measure, and I'm happy to run good stuff.

That's one thing we can't get is ethanol free gas anymore,our Canuck a s s h o l e s in Ottawa made sure of that several years ago

Yep.... f_ers!!
Lining their pockets even more

 

[HEMIMANN]

Yep.... f_ers!!
Lining their pockets even more

I would guess the ECM is programmed for power cylinder pressure up to 89 octane.

i.e. - there isnt additional spark timing advance in the timing table for higher octane gas. The default timing is set for 89 octane gas.

But there is no such thing as homogeneous 89 octane gas. There is only a blend of low and high octane gas, and I don't know enough about combustion mechanics to trust it for engine longevity.
So I use high octane pump gas to be sure. What about extra deposits formed by too high an octane gas for spark timing? Well, I only use Top Tier gas with extra detergent additive, and hit it with even more PEA additive prior to oil change, so no worries.

Yeah, I'm retired and don't drive as much so I can afford the high octane gas price. COSTCO has the low price on top tier premium gas here.

 

[crackerjack1957]

This where a professional tuner comes into play without relying on the ECM to adjust for timing, fuel & air...........per your octane level

 

[HEMIMANN]

Better be sure you have the ZF tranny if doing that!