I know Acura recomend 91 octane for our TLs,but what do you guys think if we use 94?Do we get more hp?

 

This topic has been tossed around many times since I have been on here. The answer to your questionis no gain in HP. The computer is set for 91 octane so getting 94 would not make any change. I got 93 octane this mourning at EXXON this is because they don't sell 91 octane. I think the only place that sells 94 octane is Sunoco. The price for 91 & 93 here is the same that is premium gas it just depends on the brand. I think some cars do require 93 otane some older model mustangs & other HIGH PERFORMANCE cars. I also think other car s like Lincoln Cont, & some older Cadillac models need it also.

 

read this:

http://www.acura-tl.com/forum/showth...threadid=36770

 

yet maybe there's no gain...

but I have problem with Shell gas almost everytime that I use them... (from different stations)...

99% of the time I use Sunnoco Ultra 94... and man seriously... there's a difference....

At least I can say that the ECU will notice the difference, and need some time to adjust....

So, I am sticking with the Ultra 94 for now.... People said that Sheel is cleaner, and my friend always puts Shell in his M3, but... I find Sunnoco to be better for me and my TL...

 

In your mind.

What would the ECU adjust to ????

 

SL1200MK4 ,

I agree with you on the SUNOCO.... I started with Petro Can 91... then went to Shell 91 and now to SUNOCO 94... For some reason the car is smoother with SUNOCO....mind you I tried each for about a month and a half and I fill up a tank every week, so that was approx 5 tanks of each brand.

I don't know why and it may just be me ... but I'm sticking with SUNOCO.

Notice I did not say the car is faster, more hp or anything like that....just that it runs smoother (especially when pushed

TLS RULZ

 

The computer adjusts the timing by advancing for higer octane and retarding for lower. I don't know if there are any real gains that can be felt, but maybe it's one of those mind over body things. I went from 87 to 93 and felt what I thought was a difference. Maybe a blind test could resolve this.

 

Okay, I don't know about cars all that much and I believe that very few people do know the whole story about it. (Design/service/repair, engine/aerodynamics/chasis/brakes...etc) Indeed it takes hundred people to design a car and more then thousands people to design every single little parts in a car.

Now it's not that hard to understand just a bit of the main theory behind a car's operation. Now... from what I understand, our engine will adjust the ignition timing when it sense knocking, correct? And that can be caused by too low of an octane, or simply bad gas...etc.

Our car is designed to run at 91 Octance, and if you put regular 89 in there instead it adjusts the ignition timing... So, let's take 91 Octane as a calibrated octance level that the engine is designed to run. Is it "possible" that the engine will also take advantage of the higher octane when you put 94 in there? I have yet to see hard evidence says that it will for sure or will not for sure...

I said Ultra 94 makes a difference with my TL, it really does!!! When I run with the 94 for a long period of time. When I put the Sheel 91 in there, I sense knocking & unsmoothness . Sometimes even hard starting, and casue the engine check light to pop up (not a misfire like the computer bug casued on 2000 TL, and I did tighen the cap) it goes away by itself, and the computer bug wil casue it to stay on til Acura resets it.

So, based on the that, my hyprothesis is that, either

1. everytime when I almost run out of gas, the sheel station that I pull into got bad gas...

2. the engine does adjust for the 94 octane gas... but might have two different cause.

One is that it will take advantage of it because the engine is calibrated run with 91, but will adjust for 94. Or the engine is calibrated for 94, but simply adjust itself when 91 is used...

or the 91 gas that we get here actually has LESS octane the what the computer would consider as 91 octane. So, with 91 gas, the car is running as using 89, and with 94, it runs as it's 91...

sorry about the long post... hope I make sense here and not sound like a fool

 

This issue has been covered before...check out this thread:

http://www.acura-tl.com/forum/showth...ghlight=octane