5.4L, 373a w/ 1714 Superchip

I m a bit confused with gas number ie 87 91 93 etc..

Whenever you guy said 91+...does that mean you guys use gas "93" as super peruim gas?

In my home area they only offer 87,89 or 93..

Let say i set up for 91 perf, which should i get gas, 89 or 93 ???

Thanks!
YOMAN!

 

87 means at least 87 octane
89 means at least 89 octane
91 means at LEAST 91 octane
93 means at LEAST 93 octans

If your on a 91 octane tune you can use anything from 91 octane up. ALWAYS use an octane equal to or higher than your tune. NEVER an octane lower, even one number lower.

 

If your program is set for 91 octane, you must use at least 91 octane or get serious or possibly damaging detonation. the regular Superchip is tuned for 91 octane.

If, however you were to get custom tuning, then you may request and then get whatever octane programs you want including, perhaps, 100 octane racing fuel -- if you have it available and the desire to use it.

enb

 

DARN! i guess i cant use 91 perf cuz there isnt 91 around my home...they only have 87,89 or 93

Thanks!
YOMAN!

 

Read the response! You can use your 91 if you put in 93! Use any gas that is equal too or higher than your tune octane! Got it? The words "at least or higher" is the key here. So your ok to use your 91 if you go to a gas that is 91 or higher and 93 is higher. So your ok....

 

Sorry i misread

Thanks!!!
YOMAN!

 

Sunoco sells 100-octane in my area but it’s $4.50 a gal. That would be a lot of lettuce for a fill up

 

jp


I know the feeling -- keeping my truck filled with 93 octane is a good way to help empty my wallet every month........................

my heavy foot doesn't help either.......................

enb

 

100 octane would be a waste if your best tune is set for 93. But then again get Mike to up the tune to 100 octane!

Whats in your wallet?

 

I thought I remember reading in one of Mike’s post that the 93-octane max-performance tune is good to go for up to 97-octane.

 

I really don't have a clue what the implications of running very high octane gas would be. I imagine a few numbers up over the 93 would be ok. How high is aviation fuel, gas. I think we are talking 104 octane.

 

Avgas is gasoline fuel for reciprocating piston engine aircraft and is not to be confused with jet fuel. As with all gasolines, avgas is very volatile and is extremely flammable at normal operating temperatures. Procedures and equipment for safe handling of this product must therefore be of the highest order.

Avgas grades are defined primarily by their octane rating. Two ratings are applied to aviation gasolines (the lean mixture rating and the rich mixture rating) which results in a multiple numbering system e.g. Avgas 100/130 (in this case the lean mixture performance rating is 100 and the rich mixture rating is 130).

In the past, there were many different grades of aviation gasoline in general use e.g. 80/87, 91/96, 100/130,108/135 and 115/145. However, with decreasing demand these have been rationalised down to one principle grade, Avgas 100/130. (To avoid confusion and to attempt to eliminate errors in handling aviation gasoline, it is common practice to designate the grade by just the lean mixture performance, i.e. Avgas 100/130 becomes Avgas 100). More recently, an additional grade was introduced to allow one fuel to be used in engines originally designed for grades with lower lead contents: this grade is called Avgas 100LL, the LL standing for 'low lead'.

 

The crap I’m talking about is just regular joe 100-octane racing fuel. Some Sunoco stations have it; it’s $4.50 a gal.

 

Well that clears up what avgas is these days. Been too many years since I went flying (1964-1972). By the way, how much does the avgas 100/130 go for?

And $4.50 per/gal seems a bit rich even for regular Joe at 100 octane. But if your just racing then I guess its part of the game.

 

Hi Yoman & everyone,

By now you already have the info you wanted thanks to the helpful gang here, but just to go over this a bit..............

The 1714 Micro Tuner tells you what minimum octane level to use for each program - it's premium gas tuning requires a **minimum** of 91 octane. Nothing below 91 octane is "premium" gasoline (with the rare exception of ultra-high altitudes, where 90 is premium).

The 1714's premium gas tuning requires 91 octane minimum so that *everyone* in the US can use it, including those who live west of about Texas, where premium gas is only 91 octane instead of the 93-94 octane premiums available from Texas on east (like you and I have available to us, Yoman).

No, you cannot use less octane than what is required - otherwise there wouldn't be much point of having a minimum octane requirement. Here's the real point (I think).............

The fact that east coast premiums are 93 does not mean you can use a lower grade fuel, like an 87 or an 89 octane instead of the *required* premium gas (minimum 91) when using the 1714's premium gas tuning - your local premiums just happen to be 93 instead of 91 like they are out west, that's all. You still have to use at least 91 octane on the premium gas tunes, so for you & I that means using 93 octane - and here's one thing you'll really like - yes, the tuning WILL respond to those additional 2 points of octane with a bit more power over what it would make running it on 91 in the 2004 & newer 5.4 3-valve engine! So you have a bit of a performance advantage over the west coast owners who only have 91 available to them

On the subject of using ultra-high octane fuels, like the 100 octane unleaded racing fuels being discussed.......

Using TOO MUCH ADDITIONAL octane (significantly more than what the engine is actually tuned for - say, 100 octane for example) results in reduced power & fuel mileage, and in many cases MIL lights on the dash, because there isn't enough time to burn the fuel. This is because as you go up in octane (like the 100 octane unleaded racing gas being discussed), it takes longer to ignite the mixture, so it MUST be specifically tuned for - otherwise the engine simply doesn't have enough time to burn enough of the ultra-high octane mixture and the motor "lays down."

That's just some quick additional FYI stuff, Yoman - gotta run now. Thanks for your post & have fun!