Poor running on Optimax
Discussion
Anybody experienced poor performance using Optimax. Just got the motor back after 12k service and ran like a dream, having a mixture of BP super and standard unleaded. Stopped on the way back to the North and filled up with Optimax. Straight away it stuttered when hard pressed around 4500 upwards. Thinking back, It has run really well some days and not so others, and this seems to tie in with what I put in her. Going to keep experimenting with the fuel types but this seems to be a suprise as it is always promoted as the fuel for TVR's.
Ive had the same problem over the past couple of days.
Was running fine on normal unleaded, tried optimax for the first time, it brought on the 'efi fault' warning on the display plus a slight missfire when being pushed hard. Spoke to a TVR independent and was told this should make no difference ! and that i should have the injectors cleaned. Have since gone back to normal unleaded and its fine again !
Was running fine on normal unleaded, tried optimax for the first time, it brought on the 'efi fault' warning on the display plus a slight missfire when being pushed hard. Spoke to a TVR independent and was told this should make no difference ! and that i should have the injectors cleaned. Have since gone back to normal unleaded and its fine again !
tvr5000 said:
I've bought the optimax from numerous locations and still the same result. Did'nt know about the overfilling theory. Still doing it now though after a 100 miles.
If thats the case it will not be a fuel problem. I would suggest getting the engine looked at, especially if it's just had a service. It should run fine on 95 or 97/98/99. The benefit of the higher octance fuel is only the additives added to help the engine run cleaner. The engine is mapped to run on 95 and a higher octane would only very possibly be beneficial in hardcore track driving but unlikely.
Can you describe the fault in more detail?
cheers
Whitey
>> Edited by whitey on Tuesday 11th April 13:06
>> Edited by whitey on Tuesday 11th April 13:08
I was recently told that the speed six was originaly set up using Shell Optimax (not sure how long it has been around so can't claim this to be gospel) and advised that using a higher octane rating wouldn't necessarily improve performance. I'd agree you probably got a bad lot, but at the same time I've noticed a slight hesitation when running two different fuels ie BP Ultimate/ Optimax. When a full tank of Optimax has run through it clears. Don't think it's my imagination!?
G9eg said:
Can anyone tell me what ron the BP ultimate is ,after racing at Santa Pod on Saturday with Optimax(done very well)coming home put in BP's finest and heard alot more popping and banging on overun.
Was it me or the fuel.
Most manufacturers standard unleaded = 95Ron
BP Ultimate = 97 Ron
Optimax = 98 Ron
Tesco Bio fuel (ethanol content) = 99 Ron
I recently read a test where a Scooby was tested on the rollers and the road. BP Ultimate indicated highest consistant BHP and torgue aross the curve, whilst all drivers thought the Optimax felt best when driving despite being overall behind the BP Ultimate. Tho it did hold on to the curve longer than BP Ultimate at max rpm. Tesco fuel was surprisingly behind those 2. But there was next to nothing in it. The 95 Ron fuels did adequately well. But the MPG was down in comparison to the higher octane fuels. The conclusion was that if your car has ECU management that can auto select the correct igniton map for the variances in fuel octane then it is worth using the highest octane fuel long term....
>> Edited by yzf1070 on Thursday 13th April 11:37
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