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Dave Hart
TryHard
Waikato
UZZ32

Posts: 453
Reg: 08-2005

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Tuesday, April 11, 2006 - 10:11 am, by:  Dave Hart (Davyboy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Every spec I've seen for the Soarer only mentions 'use premium unleaded'. No where does it say use '98'.
Just about everyone on this forum says use 98 if at all possible but where/when did that come about.
I don't think the latest Lexus V8's need to use 98 so what's the guts?
Has anyone proven that using 98 pays for itself with extra mileage.
David Vaughan
Goo Roo
ACT
UZZ31 V8 manual and Lexus IS300

Posts: 1828
Reg: 07-2005

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Tuesday, April 11, 2006 - 11:12 am, by:  David Vaughan (Davidv) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think we have covered that one pretty well in other threads Dave.

I found it interesting when buying the IS300 that the Lexus salesman said that standard fuel for those cars was 91, and that was all that was required. At home I opened the manual to find that it recommended 95 although lower octanes could be used where 95 was unavailable. I use 98 of course. Both cars are dyno-tuned for 98 so I will not be using anything else aside from emergencies.

I have never seen evidence that 98 fully pays for itself in fuel economy, although I do get better fuel economy. I'm paying for performance, not economy.
Morgan Cross
Goo Roo
Melbourne
Soarer TT

Posts: 1348
Reg: 07-2005

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Wednesday, April 12, 2006 - 04:51 pm, by:  Morgan Cross (Morgan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Dave, Soarers are tuned from factory to 100ron fuel, people say use 98 as it's the closest we aussies have to 100 octane.
Dan McColl
Goo Roo
Victoria
UZZ-32 V8 Soarer #138

Posts: 1025
Reg: 07-2005

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Wednesday, April 12, 2006 - 08:06 pm, by:  Dan McColl (Hoon) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I started running 95 ( because where I am doesn't have 98) and I think it has a little more midrange than 98, and I have the trc light flashing a lot more than I did on 98.

I don't think the factory tune is agressive enough for 98 to be necessary, but with aftermarket tuning it will gain more power through the use of more advanced timing.
Emanuel Spinola
Moderator
NSW
JZZ30, UZZ32

Posts: 778
Reg: 07-2005

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Wednesday, April 12, 2006 - 08:21 pm, by:  Emanuel Spinola (Manny) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Morgan
I agree completely with TTs but the V8s appear different.
Our 32 has no perceivable performance or mileage gain on 98 RON compared to 95 RON.
On the one occasion when someone accidentally filled with 91 RON, it ran like crap and pinged it's nuts off under anything more than 50% throttle until it copped a dose of octane booster.
Mark Paddick
Goo Roo
ACT
UZZ31 V8 Soarer , JZZ30 TT Soarer

Posts: 2319
Reg: 07-2005

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Wednesday, April 12, 2006 - 11:26 pm, by:  Mark Paddick (Sparks) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think Actives run a bit more initial advance. The ECUs are internally identical to normal V8 ones but have a different part number so may run different PROM in them. An Active ECU in my car does seem to give a bit more instant grunt but seems to lack midrange compared to a normal V8 ECU. This is probably not actually the case; the midrange just feels worse because it's better down low.
I'll hope to eventually set up a test rig that will tell me for sure what the difference is.
Dave Hart
TryHard
Waikato
UZZ32

Posts: 459
Reg: 08-2005

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Thursday, April 13, 2006 - 01:29 pm, by:  Dave Hart (Davyboy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

As I said earlier, all the specs I've seen have said use premium unleaded and that to me means 95 and not 100 or 98. I have yet to see anything than other on this forum which says use 100.
All I'm asking for is to see something officially from Toyota to use 100 or 98 octane.
The SC430 has a higher compression but uses a lower octane fuel, not sure about the LS400/430/GS430 or the Celsior.
I've been happily filling up on 98 but now the price is getting too much especially as I don't have a heavy right foot.
I was lead to believe that the extra cost of 98 paid for itself with extra mileage as well as power but I don't think I really need any more power for normal every day driving. So if there's nothing to be gained with extra mileage I might as well go back to premium 95.
David Vaughan
Goo Roo
ACT
UZZ31 V8 manual and Lexus IS300

Posts: 1841
Reg: 07-2005

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Thursday, April 13, 2006 - 04:19 pm, by:  David Vaughan (Davidv) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

So far as I have seen, Toyota recommend 95 for all their Lexus-style cars (of which the Soarer is one) and allow that you may use 92 without harming the engine, but it is not preferred. I know of no recommendations for 98+ from Toyota but have already given my rationale for using it. I would need to pay for a retune to switch back to 95 which would mean two to three years of driving to pay off the economy measure!
Ken Packer
Tinkerer
Queensland
TT

Posts: 62
Reg: 07-2005

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Thursday, April 13, 2006 - 04:23 pm, by:  Ken Packer (Kpack) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I've been using Freedom Fuel's 95e (10% ethanol), I can't feel any drop in performance , the economy is improved ( an extra 100 km's per tank) & it's 2cents a litre cheaper that regular unleaded.
Anyone else had the experience with ethanol blend?
Anish Varsani
TryHard
QLD
V8 UZZ30

Posts: 232
Reg: 07-2005

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Thursday, April 13, 2006 - 05:06 pm, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

There's a definate change in the seat of the pants and wheel chirp dyno with 98 vs 91 octane. Can even feel the extra acceleration with 98 compared to 95RON.
Robert Pressnell
Tinkerer
Victoria
V8

Posts: 35
Reg: 11-2008

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Saturday, July 11, 2009 - 12:16 am, by:  Robert Pressnell (Bob_pressnell) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I would'nt run my Soarer on fuel with ethonol in it i've used it in x3 other cars.And i've always gotton less k's from ethonol based fuel.Anyway acouple of weeks after i got my Soarer it started pinging and running like i started running it on Premium unleaded and it runs like a dream on it and i get about 100k's or abit more extra to a tank.I went to SYDNEY at XMAS time i filled the tank up as much as i could i left WALLAN and i stopped in Goulburn as i has a 20litre jerry can of fuel in the boot.But i could'nt be botherd putting it in so i just put $20 of cash in and with the 4cent off it was only 96cents alitre or something.Anyway after putting $20 in i proceeded back on the hwy and drove straite to my motel in Liverpool and i had about a 1/4 of a tank left when i got to the motel in LIVERPOOL.Thats one thing that supprized me was the milage i was getting out of atank of juice when i first got my SOARER i thought v8 eat juice but i get top mileage out ofmy SOARER
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 4459
Reg: 10-2005

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Saturday, July 11, 2009 - 10:32 am, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Indeed, I drove from central Auckland to Mirimar Wellington on a shade more than 3/4 of a tank in my UZZ30 once - thats just over 650km on just over 60 litres of fuel. Not too bad and I wasn't taking it easy either. Even my JZZ31 isn't much better than that on the open road.

Disagree about E10 though, the 98 Octane that Gull (local brand) sell here is very, very good stuff, so it is possible to have a good quality ethanol mix.
Adam Peterson
Goo Roo
Western Australia
Supercharged & Intercooled V8

Posts: 2451
Reg: 04-2006

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Saturday, July 11, 2009 - 11:53 am, by:  Adam Peterson (President) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I had trouble starting with 95 and it would keep running like crap at both idle and under load.
As soon as i filled it with 98 it ran fine again.
Lawrence Ostle
DieHard
NSW
tt

Posts: 918
Reg: 12-2005

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Sunday, July 12, 2009 - 06:36 am, by:  Lawrence Ostle (Lawrence) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

There's a thread on Clublexus about this. 98 is apparently UNHEARD of in the USA based on observations of the comments, most of the SC400's run on lower octane it would appear.

Having said that, I always use 98.
Andrew Duaso
TryHard
Victoria
V8

Posts: 170
Reg: 02-2009

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Sunday, July 12, 2009 - 08:03 am, by:  Andrew Duaso (Andrewd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

you do know that the USA rates its fuel differently!

their 93ron = our 98ron

thats why they havent heard of 98 over there as it'd be 100+

google it
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 4461
Reg: 10-2005

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Sunday, July 12, 2009 - 09:38 am, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

They use MON, not RON.
Scott Casey
TryHard
nsw
soarer v8

Posts: 256
Reg: 02-2008

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Thursday, July 16, 2009 - 07:55 pm, by:  Scott Casey (V8soarer_1991) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Matthew Sharpe wrote on Sunday, July 12, 2009 - 09:38 am:




Plus depending on what season, they put fuel additives in.

96 has been proven to be the best price per 100km to $$ ratio in australia. I would still love to put 100 in the tank out of the bowser.

Ethanol burns "BLUE". Fast and the Furious here we come.

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