lol yeah socal gas really suck! I just found a gas station that had pump 101 unleaded and decided to pump 1.5 gallons in. ( my sti friends love that 101)

So you guys are saying that 1.5 gallons of 101 mixed with 91 only brings my octane up to 92? How much do I need to mix to get a octane rating of 93-94.

Also one more quick question...... I paid $5.85 a gallon for 101, how much do you guys pay for it?

 

yup, *assuming you filled it up*. from an empty tank, 1.5g 101 to 11.5g 91 gives you ~92 octane. 4g 101 and 9g 91 will get you to ~94 octane.

if you do this regularly, remember that the *ratio* of gas going in is what you measure, not "4 gals 101 in a full tank". otherwise, the higher-octane gas already in your tank would raise the blended octane. if you've ever used two-stroke engines and had to mix oil in your gas, you know what i mean.

you can use the calculators to get pretty stable ratios at certain quantities-

gallons:
total---101---91
-------------------
13------4------9
10------3------7
7--------2------5

...so the trick is to fill with those quantities when blending.

my favorite calc is no longer online, but this one is ok:

http://www.motorsportsracingfuels.co...alculator.html

prices- 5.85 is about average in this state, seems like. i get mine at the track, and there are 2 stations around here that i know of, they are all right in that range.

 

Thanks bro, good info! Next time I fill up I'll try 3.5-4 gallons.

 

how about we talk about selective reading, almost useless is not useless. deposit comments were all towards leaded fuel and some were about the cat. everyone said it will help a little. it definately wont help alot. the fact that it helps above 5.5k is why dynos and track times are better as well as the fact the pulls are in 3rd or 4th at peak load and tq where afr and knock effect timing advance. im not sure how often this guy gets above 5.5k in 3rd (~60-84) & 4th (~85-120) to use that advantage. certainly not ever time he accelerates. and even if we misinformed him, the only danger we have caused him is what he might do with that extra disposable income.

its unfortunate you have that **** gas, but you will spend hundreds more over the course of a year filling 4 gal @5.85 then you would 4 gals @ 2.50 (or whatever it is in cali right now). maybe get a mod (mbc/ebc) instead and if you want mix in some 101 for meets, races, or just for a fun day then you can up boost and take advantage of that high octane. but its your money and car so maybe you would enjoy 93 octane everday more.

 

How much would I have to turn up the boost then? I thought the stock 20 psi is just fine.

 

hm, you sure about that? considering that leaded gas was never part of the question, and this comment:

... is the one that drew the concern from the poster, i think the selective reading is running rampant.

but if you really feel the need to tell a guy that using an MBC on 91 is better/safer/cooler than splashing some 101 in the tank, hey, who am i to argue?

enlighten us, please.

 

ok now the real question my evo is modded up with perrin shortram intake cat delet downpipe perrin boost tube 660cc injectors runnin 21PSI on turbo can i run Trick116oct at the trace on a dynotuned ecu or do i need the utec set up for that ?

 

three part answer:

1- this has exactly NOTHING to do with the original thread, with all those mods in the mix. none of this discussion applies to you in the least. consider starting a thread of your own instead of hijacking.

2- do you really think you're going to get a better answer here than you would from whoever did your tuning? why don't you just ask whoever tuned your UTEC for all those mods?

3- i know i share your bad habit of not capitalizing, but damn, dude- punctuation? maybe? just a little? spelling, even? i've read your post 5 times and still can't make out what exactly you're saying.

clear, concise answers require clear, concise questions. we all need to try a bit harder around here.

(feeling like the grammar ****)

 

Thats one post. You said there was soo much misinformation in this thread you had to post. one part of one post is too much huh? You sure have a wacked out concept of what is excessive. You must post often if you will post b/c someone said one thing wrong or you just don't visit here often. I did not tell him to run an mbc nor did I tell him an mbc was safer, cooler (what are you 15, who recs a performance mod b/c its cooler?). I said i would prefer, let me write that again I PREFER that power up top all the time and at a significantly cheaper price.

~20.3 is stock on IX. no need to up boost (especially on 91 oct) without other mods and tuning. but the taper of our stock solenoid is weak sauce ~4 lbs of taper to 16 lbs at redline. a mbc/ebc will eliminate most taper. you could hold ~19 at redline.

 

let's see-


look, i don't know why you've got such a boner over this, but if you just READ the original post, maybe you'd see the problem- let me cut it down a bit so you can digest it easier:

it's just that simple. are you with me here? now, he got exactly one (1) good, basic answer:

...(and that's really all he needed) before the BS started flying. now, we have no idea what exactly your post said before you edited it and started claiming to have added something valuable here, but what we DO know what it says now. let's look a bit closer:

...so, basically, you start off with a vague (and incorrect) warning about something that wan't even part of the question, proceed to tell him upping his octane to the proper level will get him no gains without "tuning or upping the boost", then spend the rest of your post getting back to the conclusion that the car is in "safe mode" on 91, and it actually does help. but not much. so, which is it?

and this is after editing for clarity. hm.



i visit here quite a bit, and have done so for quite a bit longer than you, from what i can see. i try to limit the advice i give to those topics i know from first-hand experience- mainly chassis tweaking and fuel blending. if everyone else around here did the same, we'd have a hell of a lot better signal to noise ratio around here. care to make any more assuptions about me?

wow. i'm not really sure how to respond to this. do you really not even know what you yourself said here? let me help out:

now, you'll notice that nowhere in there do you actually say that "you prefer", and let me write that again because apparently this is that important, "YOU PREFER that power up top all the time, blah blah blah". nowhere. ok?
so, i'm thinking there are some communication issues here that we're working with. but no big deal. i do think it's incredibly funny that someone who just earned the right to legally consume alcohol is accusing me of being 15, though...


fair enough, and i'm not really arguing with at least half of your points. it's the ones where you're contradicting yourself that i have a hard time with, along with the rest of the speculators.

here's a fun idea- start pumping 91 into your tank for a few weeks (i beleive where you come from, they call it "regular"), and then see if you feel like arguing against a bit more octane being a good thing. that's all the post was about, sparky. really.

by the way- yes, your team does kick ***. i'm pretty jealous...