Dicecal

I live in AZ and the best pump gas we can get is 91 octane. However, there are a few stations that sell 101 VP racing fuel at the pump. Any idea what ratio of 91 and 101 would produce 93 octane? I remember there being a octane mixing table posted before, but can't find it after a search. Thanks!

Mr. Lucky

This is for a 92/100 mix, but will give you the general idea:
http://www.osbornauto.com/racing/blend.htm

It's just simple averaging. For example:
3 gallons of 101 = 303; 2 gallons of 91 = 182
303 + 182 = 485
485 / 5 (total # gals) = 97 octane

Dicecal

Thanks!!

vetteship

No 93 octane available in So. Cal either. Do we really need to worry about this, or will the car computer adjust to the lower octane without any major power losses?

Redrc

Make sure hi octane gas is unleaded.

Formula is gal. x octane plus gallons x octane divided by total gallons. ie. 4 gallons 100 octane= 400. 14 gal of 91 octane= 1274. 400 + 1274 = 1674. Divide by the 18 gallon tank =93 octane.

OregonC6

Over ten years ago I sold off my collection of first gen Camaros. An original Z28 and two SS 396's all stock. I got tired , very tired , of mixing octane boosters and racing fuel in the right proportions so that the engines would not knock themselves to bits.

Of course, the engine management systems in the C6 and Z06 are supposed to be able to adjust for octane. Having been through the octane think years ago, though, I cannot help but think that it was/is very dumb for GM to sell a high performance car that using a recommended octane that is not available on the entire west coast!

We have 92 here in Oregon at many stations. That works OK UNLESS you get a bad tankful which seems to happen about every other fillup. One thing keeping me from too seriously considering trading up to a Z06 is the 93 octane recommendation. There's just something about buying a car that I CANNOT get fuel for that bothers me.

And....I simply do not believe that the car will perform the 'same' on 90 or 91 as on 93. just my opinions. GM should sell an octane booster specially made for the Z06 if they are going to persist in producing a car for which gasoline is not available.

And...here's a thought. Everyone is talking about alternative fuels, flex fuels, corn based fuel even recycled cooking oil of all things not to mention alcohol additive to gas in the winter etc. So.........I think the handwriting is on the wall and that it may someday soon be difficult to get even 90 octane OR the 90 or 91 octane "fuel" will contain other things besides gasoline that will totally mess up the Z06 or even the C6.

I remember how nice it was to pull in for a tankful of 100 or 103 octane with lots of lead! Perhaps in the near future we will fondly remember how nice it was to pull in and fill up with PURE gasoline instead of junk that will ruin our cars. Enjoy it now. People speculate how much the C6 and Z06 will be worth in several decades. The answer might be very little if no fuel is available that they can run on. LIke all the old vettes running around now. They either downtune them, change the pistons, or play with boosters and racing fuel etc to get the engine to run...and this is a game that must be played every time you fill up.

so why exactly won't florida allow offshore drilling?

Hoonose

I use 4 gallons of 91 octane and 12 gallons of 100 no lead at my typical 16 gallon fillup.

Michrider

If the Z is the car you want, I wouldn't let 91 or 92 in your area stop you. It's optimized for 93, and can easily adjust/adapt to 91 or 92 without 99.9% of the general public ever knowing the difference.

87 is a different story, it'll rattle to death. Plenty have hit the dyno on west coast gas and run hp numbers right at the spec. Add 12-15 % back for drivetrain loss and your right around 505hp.

At worst you could put a couple bottles of octane boost in. But there are plenty driving around out there with owners smiling ear to ear on the available premium. Can't believe GM released a car tuned for 93 is a bit over dramatic. If it were tuned for 91, the rest of the country would be pissed it wasn't optimized for their 93. And it may not have a higher advertized hp than Viper. 505 hp sells cars, makes headlines. If it pulls a hair less hp on your fuel, it's still more car than 99.999% can ever handle. So it may top out at 194 instead of 198, is that really a deal breaker? That would be a shame, because you'd miss out on owning the best vette ever made.

GarryZR1

Make sure both fuels your mixing are unleaded and compatable or you might not like the results.

Joe0121

A while back I made a thread about E85 fuel ( made from corn) it is already being used in Europe, from what I understand on the www.livegreengoyellow.com web site is it has a higher octain [sp] than pump gas but it doesnt give any specific number. Also from what I understand it isnt that difficult of a thing to convert to this E85 stuff from normal gas. I think a different fuel filter.

http://www.e85fuel.com/e85101/faq.php

This stuff is rated 100-105 oct.

glass slipper

Except for the 87 octane part. The EPA requires all cars sold in the US to be capable of running on 87 octane.

Michrider

It's capable of running on 87 but will rattle like marbles in a tin can. It'll run and meets the letter of the law, but the ungodly knocking will tell the owner there's a huge problem going on. Even the C5Z with a hair less compression did that. 87 in an 11 to 1 motor will preignite from the heat and compression alone. You can pull all the timing out you want, it will still have a death rattle so loud you'll swear parts are hittin the road. Even the owner's manual tells you 87 will cause damage. 91 is a different story, it'll be fine and even better with some octance booster.

Velocity Steve

[QUOTE=OregonC6]
One thing keeping me from too seriously considering trading up to a Z06 is the 93 octane recommendation. There's just something about buying a car that I CANNOT get fuel for that bothers me. I remember how nice it was to pull in for a tankful of 100 or 103 octane with lots of lead!

Yep! Filler up with 260 sir! (Sunoco 260 for you youngsters)

People speculate how much the C6 and Z06 will be worth in several decades. The answer might be very little if no fuel is available that they can run on. LIke all the old vettes running around now.

You obviously missed the Barrett-Jackson auction in January.

so why exactly won't florida allow offshore drilling?

Because we already have 93 octane here. Also, it keeps the beaches clean for visitors from Oregon.

teds427

My Z pulled 448.54Hp on 91 octane last week, runs like a raped ape on 91, I wish I could get some 93, but I don't know if I could handle the extra HP!
Ted

427CPE

Cross Subtract:

10 parts total


Use a 8:2 (4:1) for any volume. For every 1 unit of 101, add 4 more of 91 and you are set.

Hoonose

That's way too hard to figure out at the pump!
Use this chart:

http://www.socalevo.net/index.php?op...d=17&Itemid=33

Typically on empty the C6 takes 16 gallons of gas.
Look at 6 gallons of 91 and 2 of 100 octane = about 93 octane. Multiply by 2 for 16 gallons.
That's 12 gallons of 91 and 4 of 100.

Redrc

The problem with the charts is it doesn't tell you how much of each you need on consecutive fill ups.

After the last fill up, I had 92.43 octane (I figured it out wrong in my head). So today I went to the 76 station that has 100 octane and 91. It takes 1 gallon of 100 octane plus 3.5 gallons 91 octane to make 93 octane. See my post above. Another way of saying it is for every 4.5 gallons of gas I need, 1 has to be 100 octane.

My odometer said about 160 miles. I get about 20 miles per gallon so I needed 8 gallons to fill the tank. So 4.5 gallons into 8 is ballpark 2. I needed 2 gallons of 100 octane to make 93 octane. BUT I was low to begin with (92.43 octane) so I put 3 gallons of 100 octane and filled up up with 91 (total of 4.7 of 91 octane).

No go to the about post formula and plug in the numbers (when I get home). 3 gallons x 100 octane plus 4.7 x 91 plus 10.3 x 92.43. The gas tank holds 18 gallons so 18 minus 7.7 (3 of 100 and 4.7 of 91) leaves 10.3 gallons of what I had in the car from my last fill up.

300 + 427.7 + 952 = 1679.7 divided by 18 gallons the tank hold equals 93.3 octane now in my car.

It's really simple after doing it once and takes a min.

Hoonose

I drive til it goes on low, then I go to my gas station.
I put in 4 gallons of 100 no lead.
Then fill it with 91.
I think no harder than that!

FIRSTC6Z06

I'm in Newport Beach and mix 3-4 gals 100 (Bonita Canyon Union Station) with the rest 91 every time I fill.

Michrider

Exactly my thoughts. The whole 93 thing is way overhyped. Tons of people out there in 91 only states enjoying the bejesus out of the car. No need to take the car out of your consideration because it may make a hair more hp on 93. 448 at the rear wheels is supercar performance any way you slice it. That rwhp will do quarter miles in the mid 120 mphs all day long on 91.