Just curious to know, What Octane gas do you use in your VX?
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Just curious to know, What Octane gas do you use in your VX?
93 for the Supercharger!!
92 is the highest octane at our pumps. In fact only Chevron carrys 92 so it's the only place I fill up, everywhere else is 90 premium.
Supercharged
I'm supercharged, and I've been using 87 for a while... I just don't feel like buying premium every 270-280 miles!!!
I will, though, put in premium every once and a while... and will definitely go back if the price of gas drops at some point.
87 is what the book calls for. Supercharger recommends 91+ but our kncok sensor is able to handle the lower octane (with noticeably less power) without damage for those with the SC trying to save money...
phew thought i was the only one getting 300ish miles on my vx....
________
The Sanctuary of Truth Pattaya
I buy 93 octane. If thats whats actually dispencing or not is another story.
You can run with lower octane, but you increase knock count. Once knock count reaches some limit the ECU retards timing. It takes 4 degrees of retard to quench the knock of 1 degree too much timing.
More timing gives more power and mileage. Some of you have posted in the past that you get better mileage from resetting the ECU. This is reseting the timing table back to zero. You should not have to do this if you have enough octane to keep the knock sensor happy.
I'm guessing that you can go farther per dollar on the higher octane because of the increased timing.
It would be very hard to prove this without running several tankfuls of each gas through to get the ecu set to each gas. Resetting the ECU gives the lower quality gas a temporary mileage advantage.
John C.
Use mostly 87...but when 85 is available my VX loves it...gets better mileage and performance
spazz:smack:
Just don't want to take any chances with lower octane fuel. It may seem to cost a lot, but it's still cheaper than throwing down another 5 grand for another motor. My VX is my hi-dollar ho. :cool:
I notice better performance and slightly better using higher octan. I usually use 89, but I'm probably gonna start running 93 all the time.
Joe
...For some reason I can't explain I keep buying 93 :naughty: Oh yeah, I get more GittyUp :D That's the ticket :yes:!
I see by the results of this survey that most of us can't afford high octane......what is up with the gas prices!!!! :mad:
Actually Guys, the reason I started this thread is becauce the service manager at my Isuzu Dealer told me recently to stop using 93 octane. He also switched my VX from synthetic oil (which I've used from my first oil change). I believe his exact words were " this engine wasn't built for 93 octane gas or synthetic oil, it will run smoother and better with 87 and regular oil".Quote:
Originally posted by powered by isuzu
I see by the results of this survey that most of us can't afford high octane......what is up with the gas prices!!!! :mad:
Is this BS?
High octane gas and synthetic oil will not hurt your engine. However, 87 octane gas and regular oil will not hurt your engine either. It was designed for 87 gas and regular oil, but better gas and oil are better for your engine. There are plenty of tests and written facts to back up my statement. Can your mechanic provide in writing tests that back up his statement?? Until he can, he's full of BS. Anyone else??
BS on both! with the SC you can certainly use the higher octane, if it doesn't need it, it will be just wasted but no harm. And synthetic oil meets and/or exceeds all SAE specs. Plus it does not breakdown like conventional oil. The guys does not know what he's talking about.
Where to they FIND these service guys!? An octane rating is just how resistant a fuel is to compression detonation (you want the spark to ignite the fuel, not compression or else you get knocking). Higher octane is just more resistant to causing knocking. Ain't NOTHIN wrong with that. Usually, the higher the compression ratio, the higher the octane, but if you put higher octane in your engine its only going to run better and protect it better from pre-detonation/knocking. Now go back there and kick him square in the huevos!
BTW...because of our elevation, Colorado's regular grade is 85.
He may not be totally wrong on the octane thing. I read somewhere that higher octane gas doesn't "burn" as efficiently in an engine that doesn't "need" it. What you need is a method to monitor your knock counts and up the octane until they stay at zero.
Neighbor owns a gas station /He says Mid grade is the way to go.Has all the additives to keep injectors clean and octane is 89 .Can't tell the difference w/Premium 94 octane ,just a lighter wallet.:flame2:
Thats crazy, it actually says 87 is the minimum for the VX in the manual. I have never heard of anything less than 87 :confused:Quote:
Originally posted by VXRaNgEr
BTW...because of our elevation, Colorado's regular grade is 85.
Usually use 90---since it's the highest available everywhere. I spoil my VX even if it does lighten the wallet (maybe needlessly).
:yes:
Hmmm....it appears you're right:
http://www.koaa.com/features/investi...iew.asp?ID=251
Looks like I'll be switching to 87!
If I was in Colorado I would start getting people together and get the "public outcry" that they say they need. As it is now up in AK we pay $1.63 for regular 87 octane, if you are paying more I would be :mad:! I really can't see how everyone would be OK with this :confused:;eeky;
And I thought Spazz was just messing around saying 85, especially when he stated he got better performance out of it ;eekr;
I've used 93 and Mobile1 since it was 11mi. old.Still purrs just fine thank you
Hotsauce -- you and I were thinking the same thing...
I've actually run my VX (stock engine) through a test of 10 tankfuls of 87 and 10 tankfuls of 93. I do about 50% city driving and 50% highway (with offroading another 10% -- wait a minute...) and I found that my gas mileage did go up slightly with the higher octane (something along the order of about .5 mpg).
My main goal in the test was to see if the higher octane was actually cheaper to run (to see if the better gas mileage would compensate for the higher price at the pump) and I found it really didn't.
If I remember correctly when I did the test it worked out to about $.08 per mile on the 87 and about $.10 per mile on the 93.
In terms of performance, I honestly haven't seen any performance dip or higher knock count on the 87.
Sorry guys but i mix my gas for my vehicross
Mix it?? What are you running??Quote:
Originally posted by VX-KING
Sorry guys but i mix my gas for my vehicross
Octane Boost (104+)
Turbo Blue
Jet Fuel
50/50 Mix
Wow, that's some machine!!!
;eekp;
Don't be sorry. many people mix different octanes to get a good "in between" for the money.Quote:
Originally posted by VX-KING
Sorry guys but i mix my gas for my vehicross
VX King - the only one to talk so much about a VX NO one has ever seen....
Tone VX King - the only one to talk so much about a VX NO one has ever seen....
Seen..... (What)
Maybe I need a couple tanks to do this, but ran the HIGH stuff for a tank and got around 260 miles. Than ran the low stuff and got 250 miles. First thing I am hoping that I am getting the standard miles out of my VX - The second is... the price isn't worth ten miles and I didn't notice any performance issues.
260 miles / 22.5 gallons = 11.6 mpg
Ouch. That's assuming you run to tank to bone dry though.
RIGHT... meaning that, by the time you fillup (before bone dry), you actually receive less mpg.
By the way, I usually get between 260 - 280 miles per tank.
My average for the 1500 mile drive fom Texas was 19.979mpg. I started with a full tank, finished with a full tank and divided the miles by the gallons I got on the way. It seemed a little easier than running the tank dry:D
here's something to try........
Read this http://www.rxp.com/Octane.htm
then this http://www.rxp.com/FAQs.htm
Dyno results http://www.rxp.com/test-cov.htm http://www.rxp.com/6.htm
Snake oil? Try a bottle and you tell me. :confused:
Hmmm... why not. I may just pick some up after work tonight and try it. Hell, I did throw a toulene mixture in my tank a while back... can't be as nervous with this stuff as I was doing that!
I read that due to atmospheric conditions above 4000 ft. octane above 87 is a waste as the conditions don't support the combustion to have any benefit. I read this a year ago in Petersen's offoad mag. At sea level the benefits are tangible apparently. I do as I read and here at sea level I rock as high octane as I can. An earlier thread suggested when the timing does have to be advanced by the ecu the car can get better fuel econ, which I was also told by a friend who worked in CART-
Ooops I meant to say above 87 is a waste-
That may be true, I haven't tried to think the physics through to check. But, it probably isn't true for cars with turbos or superchargers since they work by increasing pressure beyond the ambient air pressure, so sea-level or 9,ooo ft up, the pressure in the engine with a supercharger ought to be about the same.
super chargers were made popular on WW2 aircraft to allow engines to operate at greater altitudes by compressing the thinner air to supply the o2 to allow operation at those altitudes. A supercharger at sealevel is vastly different than a supercharger at 9000 or 10000 ft. . Same for turbo... only diff is, belt or gas driven.