Octane Question...

[Mister2]

right now im running 91 octane... should i use a higher octane fuel if im going to run 16 psi? or is it pretty safe to run on pump gas?

[KiwiMR2]

I run NOTHING but 98 on in my MR2.....the odd tank of race gas. In japan they run around 100 octane so the closest to that would be best....more so if your gonna run higher boost.

Cheers

KiwiMR2

[Mister2]

thanx kiwi... man.. u guys run high... in u.s... highest ive seen at a gas station is 92 i think... hah.. hmm.. 91 is premium here.. haha.. U.S. octane is soooo low... kewl kewl.. so 100 it is.. thanx agen!

[KiwiMR2]

thanx kiwi... man.. u guys run high... in u.s... highest ive seen at a gas station is 92 i think... hah.. hmm.. 91 is premium here.. haha.. U.S. octane is soooo low... kewl kewl.. so 100 it is.. thanx agen!

Sweet....yeah we have 91, 96, and 98....we have 3 main petrol station brands 2 of which do the 98, the other only 91, and 96. The fact that you have a US spec MR2 means your ecu is probably doing ok on 91 but would benefit on higher stuff. Im sure If I ran my j-spec on 91 it really wouldn't like it.

Cheers

KiwiMR2

[Sirius]

thanx kiwi... man.. u guys run high... in u.s... highest ive seen at a gas station is 92 i think... hah.. hmm.. 91 is premium here.. haha.. U.S. octane is soooo low... kewl kewl.. so 100 it is.. thanx agen!

You can get 93 in quite a lot of places in the US. 95 is also about but much rarer. Any higher I think you'll need to look for a specialist supplier which would be very expensive.

Something else you could consider which would help is to use a water injection system running on a water methanol mix. Methanol has an octane of 113 which would really help you out. :)

[ae111sr]

In the US they rate their fuel differently. They use a PON rating (Pump Octane Number) whereas in the UK we use RON rating (Research Octane NUmber).

91 PON = 95 RON

93 PON = 97 RON

95.8 PON = 100 RON

I got this here

Hope this helps.

[jimma]

I run NOTHING but 98 on in my MR2.....the odd tank of race gas. In japan they run around 100 octane so the closest to that would be best....more so if your gonna run higher boost.

Cheers

KiwiMR2

Only if its JDM if its a US model you need to find out which type it needs!

[Bibbs]

From ae111sr's link .. UK used Ron, US uses Pon

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

And to be honest .. I'd use the best available .. I occasionally used Super (95) in my car and it takes a few tanks of Optimax (98) for it to feel smooth again.

[KiwiMR2]

Only if its JDM if its a US model you need to find out which type it needs!

Yip....read a few more lines down ;)

The fact that you have a US spec MR2 means your ecu is probably doing ok on 91 but would benefit on higher stuff. Im sure If I ran my j-spec on 91 it really wouldn't like it.

Cheers

KiwiMR2

[Mister2]

Theres a place here that gives out 100 octane.. i used a lil of that.. buh man.. it's like... 3-4 dollars a gallon... its killing my wallet to race!

[ae111sr]

I tried some Cool Blue Race Fuel a couple of weeks ago. That's 106RON and had to pay £80 for 25 litres (lucky I was able to share the cost with a mate). What a difference but at that price it's for very special occasions only

[jimma]

Theres a place here that gives out 100 octane.. i used a lil of that.. buh man.. it's like... 3-4 dollars a gallon... its killing my wallet to race!

Don't complain mate, we pay double that for the crap stuff. All that might change now that US has nicked Iraqs reserves ;) but I doubt it 'Tony the TAXMAN' will have his lb of flesh!

[jimma]

Only if its JDM if its a US model you need to find out which type it needs!

Yip....read a few more lines down ;)

The fact that you have a US spec MR2 means your ecu is probably doing ok on 91 but would benefit on higher stuff. Im sure If I ran my j-spec on 91 it really wouldn't like it.

Cheers

KiwiMR2

Oh Yeah

[KiwiMR2]

At least you guys are allowed hydrolics etc......in the US I mean, I think...you are aye? . Here in NZ there ILLEGAL and Im sure it's even hard to get it done to a show car :(

Cheers

KiwiMR2

[jimma]

There legal in UK too,but not popular and i must admit, I can't see any fun/point to them. Just personal taste but I think them Yank custom jobs with 20" chromes, Hydraulics, graphics etc look sick (thats in the English sense of the word, not the American).

[ZeroBlade]

can the hydraulics be changed during driving?

Cos if they can then they'd be pretty cool, wouldnt have to go over speed bumps in first at about 1mph!!!

lol, other students h8 me. They go over at about 20mph i ntheir punto's and saxos, pug's etc,etc and i gotta crawl over em. that's the only time my m8 beat me in a friendly race. :D

-Z

[Fizz]

can the hydraulics be changed during driving?

Cos if they can then they'd be pretty cool, wouldnt have to go over speed bumps in first at about 1mph!!!

lol, other students h8 me. They go over at about 20mph i ntheir punto's and saxos, pug's etc,etc and i gotta crawl over em. that's the only time my m8 beat me in a friendly race. :D

-Z

bro.. if your going over at 1mph in a rev 1!!.. you would be stranded with a Rev2 or above... :P

[ZeroBlade]

yeh i think that to myself EVERY time. the other rev's r like an inch lower. I don't even wanna think about what its gonna be like when i upgrade my suspension...

-Z

[KiwiMR2]

can the hydraulics be changed during driving?

Depends on how there set up...most YES, you can go bouncing down the road or raise and lower it as you drive :D

Cheers

KiwiMR2