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Discussion Starter · #1 ·
Anyone else feel the difference when going from 87-91 or even 93 with no tune.. My 13 v6 with borlas and cai sounds and pops louder. I also feel it a bit more responsive ... Anyone else???

I may be in the wrong section feel free to move thanks in advance
 

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90% placebo effect. The other 10% is denial about having wasted money. Pretty sure there's a number of threads around here with this discussion already. They always seem to pop up on every single car forum and have people on both sides claiming they're right. Of course one side is heavily weighted towards anecdotal evidence and the other side has actual evidence, but we'll ignore that.
 

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Discussion Starter · #4 ·
Lol... Ive been thinking the same. But i do feel a bit more response but could be all in my head lol. Now as far as my exhaust popping more that's a fact... My wife even mentioned that the car sounded louder and she didn't know i had premium!!!
 

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The extra sound is probably from all the unburnt fuel flying around your catalytic converter :p
 

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There is a gain, but is it worth the 25 to 30 cents more a gallon for daily driving?
 

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90% placebo effect. The other 10% is denial about having wasted money. Pretty sure there's a number of threads around here with this discussion already. They always seem to pop up on every single car forum and have people on both sides claiming they're right. Of course one side is heavily weighted towards anecdotal evidence and the other side has actual evidence, but we'll ignore that.
Actually sir, I was aware of this false feeling. My dealer filled it with premium, I then used regular. It felt to just slide more in rpm before actually accelerating. The 91 plus works the best in mine for some reason. The 91 and 93 octane actually picked up the low end. The 93 didnt give me the miles per gallon though. Just 25 vs 33 with plus. 27 with regular. I filled up 2 tanks with each type of gas so I knew I had a full tank of that octane.

---------- Post added at 07:56 AM ---------- Previous post was at 07:55 AM ----------

There is a gain, but is it worth the 25 to 30 cents more a gallon for daily driving?
Because race car!
 

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Discussion Starter · #12 ·
Ok so i finally did quite a bit of research on similar engines and yes as Charlie mentioned it takes quite a few miles for the engine and computer to adjust timing.. And on the other hand its not worth the little bit it gives you for the price bucko .. Unless you tune!!!
 

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When we were testing the new intake manifold I had 93 octane in the tank because we wanted to test both stock and with tunes. We were surprised to see that on the stock tune the 2013 does adjust for the gas and we pulled higher numbers than expected. Almost as high as the 93 octane race tune.

I had loaded the stock tune before making the half hour drive to the shop.

Completely different from the 4.0 L V6 where you get no benefit running higher octane. It adjusts the same way the 5.0 does on the stock tune.
 

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I tried some 93

I tried a couple of tankful's of 93 shell and seen no difference in how my car ran. The 87 octane seemed to work the same as the 93. The only difference I know of was the 93 octane cost a lot more.
My car does not have a Tune. My only Mod's are Magnaflow streets and a drop in K&N air filter.

My average Miles per gallon around town goosing it a lot and not trying to get good MPG stayed at 24.9 to 25.4 weather I use the 93 or 87 octane gas.

I think if you had the Bama tuner you would tune for the higher octane and feel a huge difference but if using a stock tune it is all in your imagination. All your doing is wasting $$$$.

As far as your engine recalibrating the timing to give more power when you put in high octane is misleading. What the "Knock Sensor" does is try to recalculate the timing if the octane is to low and it senses a spark knock.

What does a knock sensor do?In: Auto Parts and Repairs, Auto Body and Interiors [Edit categories]

Answer:It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.

A knock sensor assures that you're getting as much power and fuel economy as is possible from your engine.




knock sensor



The knock sensor responds to spark knock caused by Pre-detonation of the Air/Fuel mixture. As the flame front moves out from the spark plug ignition point, pressure waves in the chamber crash into the piston or cylinder walls resulting in a sound known as a knock or ping. This is caused by using a fuel with a low octane rating, overheating, or over advanced timing. Sometimes it can be caused by hot carbon deposits on the piston or cylinder head that raise compression. A knock sensor is comprised of Piezoelectric materials; Crystals that when impacted, generate a voltage (same idea as a BBQ ignitor). This voltage is monitored by the computer, and when an irregularity is detected, the computer corrects timing in VVT (variable valve timing) engines, or triggers a DTC Diagnostic Trouble Code) in older vehicles.


Ronnie
 

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Discussion Starter · #15 ·
When we were testing the new intake manifold I had 93 octane in the tank because we wanted to test both stock and with tunes. We were surprised to see that on the stock tune the 2013 does adjust for the gas and we pulled higher numbers than expected. Almost as high as the 93 octane race tune.

I had loaded the stock tune before making the half hour drive to the shop.

Completely different from the 4.0 L V6 where you get no benefit running higher octane. It adjusts the same way the 5.0 does on the stock tune.
Yea i felt it but wasn't sure if it was in my head but the more i drove the more the throttle got more responsive off the line. I take it the new variable cam and plate do adjust well and the computer uses the extra power .. Sweet!!! Thanks for the inputs
 

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The 11-14 3.7 motor will adjust timing and be quicker. Research this and you will find out.
Is it worth the extra money, only at the track.
 

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Here is another artical

Fuel Octane, Choosing The Wrong Octane Will Cost You
This is more of a clarifying post, rather than advice or tips. It’s about fuel octane, when to choose what octane for your vehicle, and what the wrong octane will do.

Why? Because I’ve heard so many people talk about how they ‘threw some high octane’ in their car ‘to get more performance’.

First the basics. What is the octane rating you see on every fuel pump everywhere?

Without getting technical and beyond the scope of this article, octane is a measure of gasoline’s anti-knocking properties. What is anti-knocking? Well, simply put knocking is a condition in which fuel burns too early in the combustion process, also called pre-detonation or pinging. It’s the instability of gasoline that causes it to burn prematurely and unstably. The higher the octane, the more stable the gasoline.

IMPORTANT: Higher octane gasoline, which is more stable, has no more energy potential than lower octane gasoline. There is no more energy to be had from high octane gasoline, then from low octane gasoline.
What octane gasoline should I be using in my car?

Use only what the owner’s manual specifies. If your car is designed to run on regular gasoline, or 87 octane. If your manual specifies higher octane fuel, such as 89, 91, or 93 use the closest octane rating available at your gas station without going below the specified rating in your manual.

What will happen if I use higher octane gas than I’m supposed to?

A few things. For one, you will be wasting a huge amount of money paying for high octane gasoline. Second, your car will not run correctly, whether you notice it or not. Higher octane fuel requires more heat and more precision to burn correctly. If your car is designed to burn 87, it will not burn 93 correctly. Third, your gas mileage will suffer. The inability of your engine to burn the higher octane gas correctly will cause your engine to produce less power and thus will require more fuel to perform at the same level.

What about using lower octane gasoline in a high octane engine?
In this situation, you will see negative effects that could be even worse. Using low octane fuel in a high octane engine will result in severely reduced performance because the engine will attempt to adjust to the lower octane gasoline. In extreme cases, or with prolonged use of low octane gasoline in these engines, pinging or pre-detonation can occur and can eventually destroy your engine. Pre-detonation causes very hot conditions in your engine and can melt sparkplug and pistons.

What fuel you use in your vehicle is important. Make sure you always follow the manufacturers recommendations. Using a fuel other than what the manufacturer specifies will in no way help you save money, gain power, or do anything other than cost you money.
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I say again: " Unless you retune for the higher octane you are not getting more horsepower just putting in high octane 93 in a stock tuned 3.7. All you are doing is wasting $$$$ you could be saving for your Bama tuner.
Ronnie
 

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The 11-14 3.7 motor will adjust timing and be quicker. Research this and you will find out.
Is it worth the extra money, only at the track.
I have and, as I stated, there's anecdotal evidence, but no actual evidence. Even in this thread, that's all there is and people are taking it as fact. I'm not saying it doesn't, I may have just not found a source for the info where this is true, but people saying "it totally does because things were different than expected and I feel it's different" isn't evidence, it's conjecture.
 

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Discussion Starter · #20 ·
I have and, as I stated, there's anecdotal evidence, but no actual evidence. Even in this thread, that's all there is and people are taking it as fact. I'm not saying it doesn't, I may have just not found a source for the info where this is true, but people saying "it totally does because things were different than expected and I feel it's different" isn't evidence, it's conjecture.
True..
 
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