[BiXLL]

This has been gone over many times, and I told myself that I would never get involved with this topic again. I will say though, that there is no way you are going to get pre-ignition on the Titan using 87 octane. With the 93 octane being 20 cents a gallon higher, you are throwing money away using it.

If compression was in the 10.5 to 11 range it would warrant high octane, but at 9.8, its a waste of money. (my opinion) I will drop this now and say no more.....I swear I will!

 

[JetTech]

This has been gone over many times, and I told myself that I would never get involved with this topic again. I will say though, that there is no way you are going to get pre-ignition on the Titan using 87 octane. With the 93 octane being 20 cents a gallon higher, you are throwing money away using it.

If compression was in the 10.5 to 11 range it would warrant high octane, but at 9.8, its a waste of money. (my opinion) I will drop this now and say no more.....I swear I will!

:roflmao: Just couldn't help it could you Bixll??? You crack me up!!

 

[BiXLL]

This has been gone over many times, and I told myself that I would never get involved with this topic again. I will say though, that there is no way you are going to get pre-ignition on the Titan using 87 octane. With the 93 octane being 20 cents a gallon higher, you are throwing money away using it.

If compression was in the 10.5 to 11 range it would warrant high octane, but at 9.8, its a waste of money. (my opinion) I will drop this now and say no more.....I swear I will!

:roflmao: Just couldn't help it could you Bixll??? You crack me up!!

Oh hush! I am weak!!!! I just hate to see people waste money!

 

[SMOKEDYA2]

This has been gone over many times, and I told myself that I would never get involved with this topic again. I will say though, that there is no way you are going to get pre-ignition on the Titan using 87 octane. With the 93 octane being 20 cents a gallon higher, you are throwing money away using it.

If compression was in the 10.5 to 11 range it would warrant high octane, but at 9.8, its a waste of money. (my opinion) I will drop this now and say no more.....I swear I will!

bixll im with you on this one. i've run 87 octane in my quad which has a commpressio ratio of 11.3-1 and it has no knock or ping. the only time that you cant run on pump gas anymore is around 12.5 to 1 and even then all yu need to do is put in a little mixture of some higher octane race fuel with the highest pump gas you can get and its gone.

higher octane rating does not increase power, just the preignition

 

[BiXLL]

This has been gone over many times, and I told myself that I would never get involved with this topic again. I will say though, that there is no way you are going to get pre-ignition on the Titan using 87 octane. With the 93 octane being 20 cents a gallon higher, you are throwing money away using it.

If compression was in the 10.5 to 11 range it would warrant high octane, but at 9.8, its a waste of money. (my opinion) I will drop this now and say no more.....I swear I will!

bixll im with you on this one. i've run 87 octane in my quad which has a commpressio ratio of 11.3-1 and it has no knock or ping. the only time that you cant run on pump gas anymore is around 12.5 to 1 and even then all yu need to do is put in a little mixture of some higher octane race fuel with the highest pump gas you can get and its gone.

higher octane rating does not increase power, just the preignition

I hear ya smoke, it just amazes me at the number of people that talk themselves into the truck, or car having more power becuase they buy more expensive gas! I swore I would stay away from these topics, as you can not make some understand the concept of what octane is!

 

[GETSOMZ28]

hmm, I use 86 octane and dont have any knock (though I am at 5000ft).

 

[PowerT]

I stopped by the store and picked up some gas conditioner with Jet Fuel. I'm currently running 91 octane now...Although it hasn't completely disappeared, the pinging has significantly been reduced, and acceleration has returned to normal, very responsive again.
Just in case I got some bad gas somewhere, I'm going to run this tank low, then run a tank of 93 octane through it, along with some more gas treatment. After that, I'll go back to 87 from Shell. If the pinging returns, I'm heading to the dealer.

 

[NateL]

I always run 87, although I do "treat" it to 91 whenever I wax it... which is twice now in 12k miles. The higher octane did absolutely nothing for me, actually I got slightly worse gas mileage. I attribute the worse gas mileage to the little demon on my shoulder that was telling me use more GO pedal because it had the "good" gas in it, and made more power.

I completely agree with Bixll, but like him I don't think this is a topic I care to argue about anymore. It's been beat to death with a spoon.


Stay Classy Club Titan.

 

[SMOKEDYA2]

one of my friends used to always buys that 104 octane booster in a bottle, and he swore up and down that his car was faster with it in there.
well to prove him wrong i brought my g-tech along for some testing. with regular 87 octane we went and did dozens of 0-60 tests with it. then he filled up his car with 93 premium and added that octane booster stuff and proceeded to do more 0-60 tests. well what we found made him not buy that crap anymore! his car actually went consistantly .2 seconds slower, he couldnt believe it. i told him that his car was makin the exact same amount of power, but it was slower because of the extra added weight from the full gas tank. haha :lol:

 

[GETSOMZ28]

one of my friends used to always buys that 104 octane booster in a bottle, and he swore up and down that his car was faster with it in there.
well to prove him wrong i brought my g-tech along for some testing. with regular 87 octane we went and did dozens of 0-60 tests with it. then he filled up his car with 93 premium and added that octane booster stuff and proceeded to do more 0-60 tests. well what we found made him not buy that crap anymore! his car actually went consistantly .2 seconds slower, he couldnt believe it. i told him that his car was makin the exact same amount of power, but it was slower because of the extra added weight from the full gas tank. haha :lol:

Thats because people think it will up your octane to 104, when in reality it is ony raising it a fraction of a point (around .1 or so).

 

[BiXLL]

The high octane thing reminds me of the majic diet pill!

 

[SMOKEDYA2]

The high octane thing reminds me of the majic diet pill!

what one is that? the one where you can shovel your face full of food and still lose 5 pounds a day :lol:

yea just add some 104 booster and you'll triple your cars power :lol: :lol:

 

[PowerT]

Boy, this thread got way off track...:nono:

:wink: Sorry to hijack my own thread here, but it's about a problem I'm having with my Titan. :tears: And I think I might end up having to take it in to the dealer if it doesn't straighten up.

 

[SMOKEDYA2]

one thing i thought of was mabye there was some moister in the tank or contaminated fuel. had a car that was studering and knocking slightly, so is put some heat in the next fill up and ran it through and it was gone after that. if its not something like that then dont worry about it and just take it to the dealer.

sorry to get all hijacked on ya

 

[m95roadster]

The high octane thing reminds me of the majic diet pill!

Well, modern day engines allow for more compression with lower octane due to the use of a knock sensor. That doesn't mean higher octane is a waste. The higher octane allows the computer to run more advance than with the lower grade gas. Now if the Titan had low CR 8.5:1 then the higher octane would be a waste. Some cars (piston design) are more tolerant to knock than others. My old 86 Scirocco with 10:1 CR definitely lost power with lower grade fuel due to the knock sensor retarding timing.

Try using lower octane on a factory turbocharged car. You will definitely lose power compared to one running 91 octane.

You can use whatever gas is available, but the 91 oct will give more power. And isn't that what we all want?

 

[m95roadster]

Boy, this thread got way off track...:nono:

:wink: Sorry to hijack my own thread here, but it's about a problem I'm having with my Titan. :tears: And I think I might end up having to take it in to the dealer if it doesn't straighten up.

Your knock sensor could have gone bad.

 

[Cperki1]

My background is in supercharged motors. I was a Grand Prix GTP owner for a number of years and the octane thing comes up a lot. I will try to keep this basic and short. You only want to use the MINIMUM octane that you can run without detonation (knock, preignition). With knock sensors and computer controlled spark andvance/retard, if you can run 87 without knock and still maintain timing advance, you are fine. Higher octane fuels in some cases actuall DECREASE power output. 93 octane fuel does not contain as much energy as 87 octane fuel does. That is why some guys will see decreased MPG while on 93 when compared to 87. If you have your computer flashed, in most cases you are going to need to increase octane as the fastest way to increase power output in our enginse is to increase timing advance. In the case of the GTP engine, one degree of timing could be equal to as much as 12 HP but one degree of KR (knock retard) could equal a 20 HP loss.

 

[m95roadster]

My background is in supercharged motors. I was a Grand Prix GTP owner for a number of years and the octane thing comes up a lot. I will try to keep this basic and short. You only want to use the MINIMUM octane that you can run without detonation (knock, preignition). With knock sensors and computer controlled spark andvance/retard, if you can run 87 without knock and still maintain timing advance, you are fine. Higher octane fuels in some cases actuall DECREASE power output. 93 octane fuel does not contain as much energy as 87 octane fuel does. That is why some guys will see decreased MPG while on 93 when compared to 87. If you have your computer flashed, in most cases you are going to need to increase octane as the fastest way to increase power output in our enginse is to increase timing advance. In the case of the GTP engine, one degree of timing could be equal to as much as 12 HP but one degree of KR (knock retard) could equal a 20 HP loss.

Yes, absolutely. If you don't need the octane then don't use it. However, an average person with no equipment will not know the computer is decreasing timing. With a motor close to 10:1 CR using 87 it's quite possible the ecu is pulling advance a lot of the times, otherwise Nissan would not even bother with a knock sensor.