Hey, is it safe to mix some high octane gas, say maybe around 109 or somthing with pump gas?


thanks

 

Yes, it should be safe but, its hard to compute what octane you'll end up with. I mean if you added 10 gallons of 93 octane to 10 gallons of 109 octane, you may not end up with 20 gallons of 101 octane.

 

Whoops... Forgot about leaded vs non-leaded. I was assuming both would be non-leaded. If the 109 octane is leaded, I don't think it would be good to mix with unleaded. The Cat. my not like the mixture.

 

what happens if i put in JUST 109? with out mixing it with pump gas.

 

No lead at all.

 

Unless you have a degree in chemical eng., I wouldn't assume that you could mix 2 different grades and know what the end product would be.

 

What kind of vehicle? I remember seeing a test in Car & Driver where a 1999 Accord V-6 made less WHP on 93 octane than it did on 87 octane. If your car, ie: MCS, only needs 93 octane, you'll not get anymore WHP with 109. The compression ratio doesn't change, even with 19% pulley mods. If the 109 is leaded.. DON'T use it.

 

>>Unless you have a degree in chemical eng., I wouldn't assume that you could mix 2 different grades and know what the end product would be.

i'm with you. But is it safe to pop in some gallons of 109 with pump gas?

 

apex, I'm not going to put ANY lead in my Cooper.

Now i have the MC, so would 109 or higher be safe to use? say if i put it in by it self, no mixing?

and how much should i use when mixing?

 

I don't have my owners man right here in front of me....but if it say 93, that's what I'd use.

I would NOT use 109. Even mixed with anything else.

 

>>I don't have my owners man right here in front of me....but if it say 93, that's what I'd use.
>>
>>I would NOT use 109. Even mixed with anything else.

k, thanks

 

To calculate the resuting octane number when mixing two types
of gas, just do this:

Gallons-of-octane#1 TIMES octane#1
PLUS
Gallons-of-octane#2 TIMES octane#2

Divided-by total number of gallons.

Like this:

You've got 6 gallons of 93 octane and you add 8 gallons of 109

((6*93)+(8*109))/(6+8) = 102 Octane.

Now, why would you want to put in gas that burns less well?

Higher-octane is HARDER TO BURN!!!

It's not going to make your car faster. It will make it slower.

References:
Click and clack say it's fine. Cartalk
Doesn't go faster cartalk
The government says you don't need it Feds

_________________

 

ok, well someone told me they put in some 100 oct in there MCS and it felt good. so i was just wondering

thanks

 

It will run on 109, and you shouldn't have any really adverse affects. The question is will you really see better performace? Where most cars are optimized to run on regular, and get the best mileage with regular, the mini is optimized for 93. You will actually see worse mileage with regular. I can guarantee worse milage with the 109, you should see a smoother ride, not neccesarily faster.

 

>>It will run on 109, and you shouldn't have any really adverse affects. The question is will you really see better performace? Where most cars are optimized to run on regular, and get the best mileage with regular, the mini is optimized for 93. You will actually see worse mileage with regular. I can guarantee worse milage with the 109, you should see increased performace however.


ah, we are replyin REALLY fast. :smile:

Well the other guy said it would not do ANY good and run worse with higher oct.

ah you guys is confusing me.

 

Sorry, I just edited, smoother increased, not faster increased.

 

>> I can guarantee worse milage with the 109, you should see a smoother ride, not neccesarily faster.

Why would you have a smoother ride with gas that doesn't burn properly in that engine?

Just curious.

 

hmmm i dont know what to think
hmmmmm

 

>>hmmm i dont know what to think

I don't think you'll do any damage driving with a 50/50 mix of 93 and 109 octane,
so give it a try and let us know.

Please try not to get the Placebo-effect. It's hard not to see "Smoothness"
improvements when you make a change, but run the tank close to empty,
then fill again with 93 Octane and see if the "Smoothness" REALLY goes away.

_________________

 

You can make your own race gas formulations by simply adding xylene or toluene to pump gas. These two solvents are commonly found in the "Octane Booster" bottles, but can also be purchased from a chemical supply house or your local hardware/paint store.

Xylene has a R+M/2 octane rating of 117

Toluene has a R+M/2 octane rating of 114

When I was a chemist in the pharmaceutical industry, one of my responsibilities was disposing of expired chemicals. I especially enjoyed recycling the excess Xylene and Toluene

Of course, I don't suggest that anyone actually try to do this, but if you would like to read some home-brew race-gas recipes for amusement only, CLICK HERE

_________________

SE Regional, BAMA Club Moderator: PM me

 

In a modern, computer-controlled, ignition system (such as what you have in your Cooper), the computer will work hard to adjust timing to the optimal point that it's programmed for. This means that it will attempt to create the same level of performance with multiple grades of gas. The problem is that the computer cannot adequately adjust for octane that is below its desired input (that's why we're told to run 91 octane at minimum). But likewise, it's not going to "keep getting better" if you give it higher octane than its desired input. If you put in 109, the car will try to adjust itself to what it would do if you put in 91.

Now, there may (and I really don't know the answer to this) be a problem with the engine actually adjusting to deal with the very-much-higher-than-91 octane...and this is why some have suggested that performance could actually be harmed by burning gas so far out of the desired range.

Point is, IMO you're certainly wasting money, and perhaps harming performance, by using race gas in your MINI. This, btw, is the same logic as to why it makes no sense to burn "premium" gas in a car that doesn't specify it. Assuming it's properly tuned, your minivan won't run any better if you gas it up with super.

(Of course, if you have a modified DME, this whole post may be moot...as I was referring to the STOCK computer)

 

So you're confused by all the answers.......why do you wnat to put 109 in your MINI?

 

>> So you're confused by all the answers.......why do you wnat to put 109 in your MINI?

because i just wondered if it felt any different. [*]null

 

Why mix?

Just get it at the pump like we do



Not a photoshop, these are located all over SC, and yes I know it's leaded and no I don't use it in my MINI

 

Likely you will foul your plugs running straight 109. Higher octane = slower/cooler burning fuel. At that great a difference from premium, that would mean a lot of unburned fuel vapor left in the cylinder and going out your exhaust. You are likely to wash down your cylinder walls as well, increasing wear with the lack of oil under the ring surfaces. You will have less power.

Though the car will smell way cool... I am trying to get the wife to wear high-octane fuel as perfume... I know it gets me all hot and bothered...