Tried higher octane tonight..., 87 to 91 Options

[Negative]

This is probably going to piss some of you off but Supreme at Chevron and Exxon (the only places i'll fill up) is barely over $2.00 here in Houston, Texas. But we get stuck with the most stringent emissions requirements in the country due to the fact that we refine most of the country's gas here. So I'm up for another illegal inspection this month. There goes another $75.00 I would rather put in my engine.

[ice23q]

how much is bloody fuel in the U.S.????? sounds like it a wod from the rear pocket to fill your cars..????... our 98 octain has just gone up to $0.99/ltr....

[KAMiX]

[mmorg3053]

Try £0.90 for a litre of 98octane in the UK. More expensive the further south you go and on motorway service stations, sometimes over £1.

[tufy]

1 galloon is 4.5 liters.
how much octane is recomended for our cars?
i know that my car's ecu is remapped by mines for 100 octan in japan.
do you think guys changing fuel needs remappin?

[KAMiX]

I just checked & 1 US gallon = 3.785 liters, 1 UK gallon = 4.546 litres. Can't you all just switch to the metric system plz? It's Soo easy to count in!


In answer to your question: Maybe. If your timing has been changed you could get some knocking with crappier fuels. Just checked your profile and doesn't look like you have any internal mods so your compression should be fairly stock.

I really dunno as your car is pretty modified (damn nice btw, first time I've spotted it!) so it would be better if a 3s-gte experienced person answerd 4 ya. I do know that a lot of imports around here with jap ECU's in them suffer unless run on BP98 (main high octane fuel we have over here). I would say turn the boost down low and chuck some unleaded pump fuel in there (not sure of what ratings you guys have over there) and see how she runs. If it's ok keep upping the boost and look out for knocking.

If it was my car, I wouldn't go too far below 98/100, in fact I would run as high octane as I could get my hands on to keep her healthy (I would also try to park her in my bedroom, but that's just me ).

This post has been edited by KAMiX: Jun 20, 2004 - 9:37 AM

[97GTinKC]

Also remember the US uses the R+M/2 method to calculate octane, (research + mechanical octane divided by 2) so our 91 is approximately other place's 98 rating

...and the price on 91 oct. has dropped back to $1.93 US dollars for 1 US gallon,,,

This post has been edited by 97GTinKC: Jun 20, 2004 - 11:27 AM

[Hym3n]

Yeah, I just went in search of cheapest 93 octane in my area.. $1.999! W00000T!

-brian

[KAMiX]

Yeah sorry I was referring to 98RON.

[Phat_Boi]

$1.83 down here

[Exile04]

Wow u guys are luck the highest octane i can find is 92 and thats about 2.30 avg the lowest it 87 and that 2.10 about

[Drocay]

super here is now 1.93 woot.

[Exile04]

Damn east cost

[Akimbo]

I run on 89, gas soared back up now...

[Eddo456]

yeah here in tampa, on the air force base the 93 premium is only 2.02 per gal, so i take advantage of it when i can.

[ParaNoiD]

we have 95 oct - 98 oct and 100 oct here ... i just use 95

[shid]

Eddo, DIEEEEE

Paranoid, we rategas differently here- so our 91 is your 98

[KAMiX]

This should up the differences a bit. Close shid but a little off

RON = tested at 600rpm (Australia/UK & Japan I think)
MON = tested at 900rpm
PON = average of both (USA)

RON MON PON
90 83 86.6
92 85 88.5
95 87 91
96 88 92
98 90 94
100 91.5 95.8
105 95 100
110 99 104.5

By the way.. Even though RON is supposed to be "research tested" and MON "mechanically tested" both ratings are actually tested at low rpms in a real engine.

This post has been edited by KAMiX: Jun 24, 2004 - 12:55 AM