Friday, September 30, 2005 - 03:15 pm, by: Edwin Burton(Hiflyer34)
Bought a 1991 limited gt lexus soarer about a month ago and once i got it i put a full tank of bp ultimate into it. The car drove fine for about 20 kms and then i felt a jerk in the acceleration. The jerking then became more often and violent. Though it wasnt as obvious when i switch the car from economy to power. I was so worried i had ruined a cylinder so i thought i would go back to just premium unleaded. The car drove normal again. I am not sure why the bp ultimate had this affect on my car. Was thinking maybe it was my injectors. The car drives well now though i can feel tiny jerks when car is rolling at a speed about 60 or above. Heard instances of optimax wrecking cars and i am still unsure why this is happening. I took it for a service about 3 weeks ago and he checked the whole car and said it was fine. Was thinking maybe the bp ultimate started cleaning the injectors and because i stopped putting it in it did only half the job. Maybe a case if just adding some injector cleaner into my car on the next fill up could be the solution. Any one have any thoughts on this?
Neil Griffiths Trader NSW 1 x JZZ30,2 x UZZ31,1 x UZZ32,1 x UZZ Track Car,1 x AeroCabin,1 x Crown V8,1 x Celsior
Friday, September 30, 2005 - 04:51 pm, by: Peter Nitschke(Pen)
I am with Neil on that. No way that Ultimate should cause problems.
Things to look into: Change fuel filter. Injector cleaner. Put 1/2 litre of metho in with a full tank of petrol to help remove any water that might be in the tank.
Saturday, October 01, 2005 - 01:54 am, by: Wayne Koh(Teknoboi)
depends man, ive been filling up with shell premium.. and in wa.. its 96 octane.. car runs fine. i think in 1991-1996 when most of the soarers were produced they were on probably fuel that was lower than 98 anyway. ive tried both.. and i really dont find a big difference to pay 10c/l extra. as i work for shell ive seen heaps of TT and V8s putting in unleaded... mostly v8s but ive asked their owners and they say it runs fine.. of course higher octane is better to a point. BUT if ur car is tuned to 98 then u must be on 98 and nothing lower.. ive been running shell premium and ive asked alot of other cars such as tt supras skylines(r32,r33,r34) 300zx silvias(s13/s14/s15) etc and ive even got replies such as shells prem running better and more mileage..
i think some cars? possibly newer ones can adapt to the octane rating.. say with higher octane it retards the timings etc? vice versa with lower octane
Saturday, October 01, 2005 - 02:16 am, by: Peter Nitschke(Pen)
Soarers also adapt OK to lower octane fuel, but with the reduced performance and reduced fuel economy, why bother? It's still cheaper than maintaining a boat for example, and you just can't beat the Soarer grin!
Saturday, October 01, 2005 - 02:38 am, by: Wayne Koh(Teknoboi)
yeh not saying to go pump ur soarers with ulp!
just saying the premium of 96 octane appears to be running fine.. and the price to performance you pay for the ultimate cant be justified by the very low performance and economy increases that is hardly measureable to my understanding..
full tank of Ultimate: 78L*$1.36 = $106.08 Shell prem: 78L*($1.21 after 4c/l off) = $94.38 just a estimate but thats $11.70 in the difference.. im pretty sure with ultimate u wont be able to get that 11.70 worth of fuel in the the increased economy and mileage!
i knows its only 11.70 buT with lots of other promotions coles express is giving out.. such as the credit card additional 4c off.. and occasionally LiquorLand with their 20c/L off and at the moment office works with their 20c/L off.. the savings are huge especially if u do shop at coles/LL/officeworks regularly they do stack up. OK now i feel im advertising.. but yeh thats how i feel. ultimate is too overated and only reason why here in WA bp have 98 ron is because if shell had their optimax.. i think bp(wa) would run out of business or have even stiffer competition
PS. Edwin, so this started happening when u put in 98 octane. possibly reset the ECU? in most cases its the dirty fuel. there have been some instances where the fuel tanker has chucked in diesel in the prem/ulp tank or ulp in the prem tank. ive also had jerking when my fuel is pretty much on low or empty.. could be possibly the fuel pump?
Saturday, October 01, 2005 - 02:47 am, by: Peter Nitschke(Pen)
Wayne, I agree, there is no real reason to go either way, it's all personal preference. I use 98 for the reasons above plus I like to think it helps keep the internals cleaner. The previous owner ran it on standard ULP for about 5 years before I bought it with no apparent problems.
Saturday, October 01, 2005 - 08:03 am, by: Mike Triggs(Mikeandimah)
We can't get high octane fuel here (except Avgas) and our car runs fine on low octane unleaded. We rarely get the opportunity (or the space!) to plant the foot though. I have had pinging issues with another "performance" car, especially when the fuel got stale, but Soarers have dual knock sensors, I think.
Saturday, October 01, 2005 - 10:46 am, by: Edwin Burton(Hiflyer34)
yeah, it only shudders when im rolling/coasting. Thanks for the suggestions, should be a big help! Once again the soarer central crew came through! lol!!!
Saturday, October 01, 2005 - 03:35 pm, by: Luis Ramirez(Lui)
if i use bp ultimate 98 rating, and i was to put one of those bottles of octane booster in the tank, that will take the octane to just over 100 like in japan. Anyone ever tried this? is there any difference or increase in power?
Sunday, October 02, 2005 - 05:32 pm, by: Cihan Aday(Cihan)
Luke, thats because you would have put in one bottle. It only lift the octane rating by a few points. ie. 98 > 98.5 RON
If you used 20% toulene mix with BP ultimate, that would lift the octane rating to 100.7. You would notice the difference after an ECU reset and a fanging.
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