boosted nogs that dialy drive!! 87 octane boost yo?
 

any one boosting on 87 i jsut got one question how much timming do you pull compared to runnong on 91

my set up

b16a all stock compression ect

and im running about 13.75 deg at 11.2 psi column p30 base starts at 24 deg so im running about 1.0 deg a psi retard


how much timming would you typically pull on your boosted set up wehn going from 91 to 87 octane


my dam gasstation keeps on running out of 91 :1

so im thinking of making it run on 87 perminetly!!

hers my bin file
880cc pte
cdm turbo

b16a

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

pull enough to stop it from detonating, then add 2 degrees so your living on the edge

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

cromes timing map is hardly accurate

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

^^ can you explain more indepth here?

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

I run 87 and Water/Meth...I took out 2 degrees from the boost maps.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

hey xeno,

was it hard to transition from 91 pump to 87 besides just pulling the timing?

also what meth kit are you using?

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

I'm curious on the crome timing too.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

Water/meth is amazing, we did a buddys talon and went from running 110 to 93 with water/meth, we actuallty had to add timing up to to stop the thing from popping through the exhaust. I don't have dyno numbers, because my slack ass can't afford a awd dyno, but dsm link estimated it at 625 hp.


To the Op, You need to keep a close eye on your plugs, check for denotation. More than llikely peak power willl be past the knock threshold with 87. so you'll think everythings fine but really your at the ragged edge to were a few pings will knock out the ring lands in a split second. If it were me i'd pull keep pulling timing until it starts to missfire, then add a degree or to back in until it runs clean, think the opposite of tuning for mbt. 87 sucks.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

I run 87 octane on my 12.5:1 CR beater. The ethanol laden "E10" cheap gas is more knock resistant than the good stuff, believe it or not. You take a minor hit in the mpg and power department, but not enough to worry about.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

So your thinking that because the knock limit on 87 and 93 was real close on your small bore 12.5cr d series, that'll be real close on a 10.5ish b16 with some boost that will have an effective cr of somewhere near 15:1.


From what i'm told, stations are dropping the ethanol content lower since gas is now cheaper than ethanol.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

No. In fact, the knock limit of 87 vs 89 vs 91 vs 93 varies depending on brand, etc. Hell, one week 93 at one station is good and the next tanker truck they get in the ---- sucks, even at stations/brands that advertise "no ethanol". My engine is a little volatile below 2000 rpms, and really I'm a dumbass for not putting in a cam w/ some overlap to help it out. But, that's beside the point.

As long as you aren't pressing knock limit, normal 200-250 whp HMT setup, I don't think 87 would hurt anything. Right up to the point you run out of octane on 87 the power and timing should be in line with what you get on 93.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

i can agree with that but earlier you stated

I dont want the guy thinking that his "e10" 87 is more knock resistant than 93, for the past year or two if the stations use 10% ethanol to bump the rating of the cheap stuff, they also used it to bump the better stuff to 93.

its all about the "edgimication" :6

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

Hrm, you are correct. Would you rather I clarified my statement like this?

"E10" 87 is going to have a lower knock limit than 93 octane fuel, so it will safely support less power. However, when operated within it's safe range, the addition of a significant portion of ethanol to 87 octane gasoline slows the burn rate of the fuel which has the effect of "retarding" the burn, as if timing had been taken out of the ignition maps. In the specific set case of my high CR undercammed D16 this provides an additional amount of thermal safety that, in my specific example, prevents pinging and detonation. Conclusions can be draw that, when within the safe operating limits of "E10" 87 octane, that the lower octane ethanol-laden fuel is more detonation resistant than pure 93 octane gasoline.


On second thought I prefer to resort to my HMT roots and tell you to ---- yourself, Tom. Cars are not simple constructs, and regardless of how much you clarify and spoon feed, people like Stalin simply aren't capable of ever understanding. Why bother? You understood what I meant. Let everyone else participate, scrabble for the intellectual scraps, or wallow in their own ignorance like they have since the dawn of time.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

---- you too, go put on your rogaine that i supposedly scammed you out of, then read up on ethanol, reapply rogaine, then get back to me. ;D

Who is Stalin????

I'm all about letting everyone else participate.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

thanks for the input i took it out for a little ripper on that gas on 6-7 pounds but didnt rev it up all the way didnt hear no knock or anything ill just pull a few degress and take it out for some rippers on fresh 87 arco..



and jd more on the e10 they dont have that here in my town i did see my first gas station here and they got e85!! so that is 85% ethanol and 15% petrol?

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

E10 is slang, not how the gas is labelled.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

more then likely they do not call it e10, here in WI you cant even buy strait gasoline any more. very few stations will still have strait 93 but all 87 and 91 is 10% ethanol

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

So "e10" 93 is better than straight 93, or at least more knock resistant? I'd have to retune(add a few more degrees?) for the "e10" to compensate for the slower burn rate?

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

Hmm interesting read, but for how often I drive my car I'll just have it tuned on chevron 94.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

i had learned timing and knock correction set for 93, my dad borrowed my car because i borrowed his truck a while back and filled it up with 87(did not tell me he did). apparently he did not hit any amounts of boost because the first pull i did it sounded like someone threw a truckload of screamers (1990's movie reference) into my cylinders

after that, it seemed to do okay :)

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

Around here ethanol "tainted" 92-93 octane is hard to find. Two hours away in Knoxville it's hard to find pure 92-93.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

I haven't seen a pump in as long as I can remember that doesn't say "All grades contain ethanol"

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

meh, I wish we had 93 here in WA. We do have 92 though. I hate how most other states have 91 as they're highest octane on most pumps. It really sucked doing my cross country drive when my car was tuned on 93.

But at the "cheap" gas stations here, they have all 10% ethanol on all pumps.

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

I'm fairly certain we have 101 or 103 at a couple of our gas stations.

We also have a drag strip, and a lot of people with more money than car knowledge and think buying premium gas will give them better mileage and make their car last longer.

I love when people tell me "I only use premium because I get better mileage and it ends up being cheaper in the end."

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

11psi 14b 8.5:1 comp Z6 87 octane all day every day bitches

Runs like ass and I don't care

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

sweet jd said 87 octane cant hurt 200 250 hp set up ;) i need to keep it at that

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

i can get 104octane 1mi from my house :6 :6

Re: boosted nogs that dialy drive!! 87 octane boost yo?
 

easy to get e enhanced 93 here. Now forget e95 or better as only the airforce base 9(great falls) and some farmers co-op in wyoming has it lol