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Author Topic: Poll 87 or 93 octane
cintibob
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Year : 1990
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I recently realized some 1.6 owners are running regular gas in their 1.6L miatas in SM. This reduces the cost of gas and some have said it increases power over using hi-test. I would like to know how many people are using regular (87) gas and what timing they set the engine at. Here in florida it gets really hot and having a stock radiator, never thought it was possible to use regular gas even though the car was designed too on the hyway.

rhart Verified Driver
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Can we do another poll for 1.8 or is it pretty much the same?

Kyle Freiheit
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The poll is probably not going to be helpful because it doesn't say which octane you are running at which timing(eg 93 octane at 14 deg). You are also going to get people who have just ran one or the other just because and have no imperical data to prove why it is better or worse...

Just my $.02

Kyle

Gatoratty Verified Driver Made Donation to Website
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You should talk to Jamie Tucker and Steve Scheifler who have both done all of the dyno testing.

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Paul McLester

Jamie Tucker Series Champ

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87 octane 14 degrees of timing is what worked best on my dyno (1.6). 93 octane seemed to loose a bit of horsepower although it was very slight and may have been due to run variations. It was a back to back test with my 1.6 draining the tank in between. Of course my 99 had the same results (about 1 hp less). I never had a detonation or preignition problem of any kind nor have I had any of my engines fail while using 87 octane. The only thing that 93 octane got me was a little less beer money. Now if you want to talk about race fuel (not just any race fuel) that is a different issue.

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Jeremy Pike
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91 is premium in california. Choice of 87, 89, or 91 at most regular pumps and 91 is uaually the minimum at the track pumps. No vote here.

cintibob
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I was just trying to get an idea of how many people were running regular. Could be 87-89 for regular and 91-93 for hi test. If I can run the cheaper reg. and gain or stay even in horsepower, great. Race gas is a waste of money in my 1.6. I set the timing as I did in the poll because the odds are more advance for the higher octane even though the constructors manual suggests 14 degrees as default alot of people on this site talk 16 or 18 and I did not know how else to set it up. I only heard of 1.6L's running reg. If 1.8L cars want to chime in I thought they can post like rhart did and state what they use and timing setup. Jamie is the first person I heard of that runs reg. gas and he runs at or near the front in cfr.

Drago Verified Driver Made Donation to Website Series Champ
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quote:
Originally posted by Jamie Tucker:
87 octane 14 degrees of timing is what worked best on my dyno (1.6). 93 octane seemed to loose a bit of horsepower although it was very slight and may have been due to run variations. It was a back to back test with my 1.6 draining the tank in between. Of course my 99 had the same results (about 1 hp less). I never had a detonation or preignition problem of any kind nor have I had any of my engines fail while using 87 octane. The only thing that 93 octane got me was a little less beer money. Now if you want to talk about race fuel (not just any race fuel) that is a different issue.

My results are the exact opposite? Must be different gas in different reasons. [scratchchin]

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Jim Drago
East Street Auto Salvage
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Gatoratty Verified Driver Made Donation to Website
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So Jim...what were your results?

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Paul McLester

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I try to dyno and race on Sunoco 100 or similar whenever possible, mostly for consistency. The gas you get out of the consumer pump can be real crap. I'm okay with that in my BMW, but hate putting it in my racecar [Smile]

-bw

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Bruce Wilson
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davew Verified Driver Made Donation to Website
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Couple things:

Premium pump gas is usually 20 cents more than regular. SO if you use 20 gallons per weekend, you save/waste $4.00

Pump gas varies wildly from town to town, and week to week. Up north we have winter gas, spring/fall gas and summer gas. We race in Wisconsin and Illinois, different state requirements. And downtown Milwaukee, near the Milwaukee Mile, has emmissions gas. My point, what works best today, may not work best tomorow.

When I have 15 cars at the track, I can't supply 93 for some guys, 89 for others and race gas to a few. So I get local premium (to have a margine of error)and everybody gets the same unless they are on race gas.

Race gas is nice because it is consistent. Tune the engine to it today, and it should stay the same for the next tank of fuel.

Very few cars make good dyno numbers with more than 16* or less than 12* of timing. And the variations between 12 and 16 are fairly small. Unless you have been on the dyno, go 14 and leave it alone.

Dave

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Rich Verified Driver
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quote:
Originally posted by davew:

Race gas is nice because it is consistent. Tune the engine to it today, and it should stay the same for the next tank of fuel.
Dave

Yup. I used 100 octane most of 2008 for this reason, with timing and fuel tuned for it. Last year I experimented a little more, with the same tune changing to 93 octane didn't seem to matter nearly as much as the weather.

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Rich Wiese

Spec Wrecker Ford

Danny Steyn Verified Driver
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Here in Brazil where I am this week, the local gas company knows how to market to its race obsessed country. They have three grades, "Regular", "Super" and "PODIUM"!!!

I'll take 20 Gallons of PODIUM every weekend, thank you very much!

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Danny
http://www.dannysteyn.com
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Drago Verified Driver Made Donation to Website Series Champ
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quote:
Originally posted by Gatoratty:
So Jim...what were your results?

The exact opposite [Razz]

--------------------
Jim Drago
East Street Auto Salvage
jdrago1@aol.com
2006-2007 Mid-West Division
07,09 June Sprints Champion

EAST STREET RACING

cintibob
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Year : 1990
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At some tracks, like Sebring, when you get the 93 octane it contains no ethanol. Jim and jamie have you noticed a difference in tune or horsepower in non ethanol gas? I hear if you run ethanol you must run richer.

iambhooper
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quote:
Originally posted by cintibob:
At some tracks, like Sebring, when you get the 93 octane it contains no ethanol. Jim and jamie have you noticed a difference in tune or horsepower in non ethanol gas? I hear if you run ethanol you must run richer.

i've seen what the ethanol can do to fuel cells and heard about it's affect on robber fuel lines and O rings.

in my ITB/C CRX, i ran 93 octane pump gas and 100 gallon race fuel. i cant recall much of a difference on either. i've not been in the SM enough, just ran 93.

hoop

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hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Shop Teacher
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91 - 14deg in cali

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Al Angulo
Auto Instructor
Ford Senior Master Tech
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