sonic

ok, thats good. you can go up, just not down!...to be honest with you, im suprised you notice any difference being chipped with a 91 program using 94.

Espritman99

jaboor, do you have the 4 cyl engine or the 6? 700-750 sounds like amazing gas mileage to me. On strictly highway driving I would be lucky to get 600-650. Also, especially on local driving, I don't notice the difference between even 89 and 91 octane. Hence, I always burn 89 octane.

wanthema

ur running risky esprit 91 is standard for our engines. ur just collecting more dirty gas =( evnetually it wil build up and p00p more problems.

i've been running 94 since i got the car.. and so far no problems whatsoever. cleaner fuel = better for the engine, and long lasting for everything else.

sonic

i do agree with the 94 being better for the engine but most people dont keep there cars for 300,000k. Only at that high a milage are you going to notice a difference from running 89 vs 91+

As for fuel milage, with my car chipped, running 94 i can get about 700-750 to tank pure hwy driving...i average around the 600 with come city, most hwy.

Espritman99

You notice a major increase in fuel economy from chipping? Which engine you have? Wonder if it would help my 3.0L. I don't really believe in all that higher octane stuff. I mean in cars like my Esprit, I run it because it is more of a race engine and if something were to happen to that engine it would be massive dollars, but to me the A4 is just a regular engine so should run fine on regular fuel. I think an engine that never sees more than 3k rpm and runs on 91 will be just as dirty inside as a car that runs on regular that sees spirited driving on a regular basis.

My trusty old '92 accord has 460k km's on it and never seen anything but regular and propane (wayy drier than gasoline) and never had an issue yet.

sonic

esprit, your absolutly right when it comes to the octane. our engines use a default setting of 91, but change quite frequently as you use different gas, water vapour does get in there so its constantly changing. If your not chipped, and you want to save money, use 89.

as for better fuel economy being chipped, i have the 1.8T. The reason i get better is because the computer no longer flucuates and puts through unused gas. it puts exactly what it needs to burn 91 or 94(depending on the program i am running at the time) thus no over using fuel to eliminate "ping". I hope that somewhat helps in the explination.

regarding your 3.0, chipping might help slightly but i think theres only 1 company that makes a chip for the 3.0 and for the cost....not really worth it. Be cheaper for you to make sure your tire pressure is always good, colent flush every once in a while and a clean air filter to get better milage...oh ya, and drive like a little old lady. its helps too.

Espritman99

haha, lost me on that last suggestion. I will not sacrifice spirited driving for gas mileage. Rather pay to play!!

wanthema

uhm.. sonic which side are u on? first u say its not true that 94 helps.. then after someone posts it does help.. then u support it... and after espirit says something u go back to hating 94?

Espritman99: the difference between a honda 92 and a audi a4 is the different build up and different materials used to make the car the way its made.

Lower octane means less filtered fuel means more things will get faster clogged because ur a4 requires 91, but u put 89. It does not matter whether ur at 80k mileage or 300k mileage, difference is the combustion in the engine.. the less octane u have, the faster/shorter distance the cam shaft goes up/down (before it touches the spark plug) which hurts your engine greatly because of early explosion in your crank. the higher it is such as 91-94... the combustion does a full length rather than half of what it should be at 87-89.

that is the reason why german researches say put 91 or higher... please think. but hey its your car and your choice whether you follow standards or not.

also for being chipped for 3.0L = Yes you will notice a better "aspired" engine performance, but not as of big gains as you would get like the 1.8T would.

sonic

I woudnt say im on either side. It depends on your application you want to use it for.

If you want a lower price for gas, use 89. it wont hurt your car but you will lose performance.

If you want your car to last past 300,000k and your going for the 1,000,000 mark then use 94

If you are chipped, you MUST use what ever fuel you are programed.

As for using 89 and hurting your engine...you wont. Our computers are extremely smart, the engineers know that people are not always going to use the proper gas which is why they give the computer the ability to change the timming to eliminate damage...which is why you see performance loss.

You must use the grade of fuel based on what your over all goal is.

wanthema

yes it will change the timing, but eventually it will start to affect engine workload because it stresses the engine so much that it cant function at standard capacity anymore if it gets use to the 89 octane. all im saying is your camshaft will be replaced quicker than a normal car that gets 91 to 94.