sputtering evora

[twisted2fit]

doesnt it depend on where u develop peak power on the rev band. saw some interesting dyno numbers on a m3 when they compared fuels..if i recall there was about 40bhp in it..all put down to the timing being retarded on the std fuel to prevent detonation

[j2 lot]

Got to agree with Robin, I can't / won't drive hard enough on the road to make premium fuel necessary and it doesn't appear to offer enough benefit for the outlay to make it worthwhile. The fact that there is a ? over how the NA runs on some premium fuels just seals the deal.

[robin]

doesnt it depend on where u develop peak power on the rev band. saw some interesting dyno numbers on a m3 when they compared fuels..if i recall there was about 40bhp in it..all put down to the timing being retarded on the std fuel to prevent detonation

I would expect your car to develop peak power at the red line (or very near it). Engines that develop peak power miles before the red line typically don't warrant revving much beyond the peak power point. The RPM at which you develop peak power won't be dramatically affected by the fuel type (though the actual power obviously is).

It really isn't worth running on anything other than 95 unless the engine runs rough or you're driving on track.

Cheers,
Robin

[Lazydonkey]

Random thread bump..... But i've been running my car on v power pretty much exclusively over the last 10k without issue.

Then Craig fitted an my13 S exhaust to my csr and suddenly it starts spluttering rather than roaring into life. Was always fine after a fee mins.

Thought it was somehthing like plugs or battery.... Then I changed to normal unleaded and spluttering went away. I'm now on the third tank and it wasn't a one off. It's completely cured.

Random! Guessing it's somehting to do with having one less cat.

Sent from a mobile device

[j2 lot]

Standard unleaded from now then & you save some money on each fill-up too

[SAJ]

Evora doesn't like Shell Nitro. When it was V Power it was ok but whatever they did when they changed it to Nitro has messed it up. T99 and BP Ultimate seem to have no issues.

[tenkfeet]

The best my car has run was on BP ultimate and unbranded super from Kyle of Lochalsh garage. Use T99 most of the time and it does not like low revs when cold.

[Lazydonkey]

Evora doesn't like Shell Nitro. When it was V Power it was ok but whatever they did when they changed it to Nitro has messed it up. T99 and BP Ultimate seem to have no issues.

That's the point of my post Saj - the "evora doesn't like nitro statement" didn't apply to my car. I ran my standard NA on nothing but vpower, then vpower nitro without issue for 10k miles.............until the exhaust was changed.

[SAJ]

Evora doesn't like Shell Nitro. When it was V Power it was ok but whatever they did when they changed it to Nitro has messed it up. T99 and BP Ultimate seem to have no issues.

That's the point of my post Saj - the "evora doesn't like nitro statement" didn't apply to my car. I ran my standard NA on nothing but vpower, then vpower nitro without issue for 10k miles.............until the exhaust was changed.

Probably just the S that suffers from it.

[campbell]

I run my NA on whatever 95 I can get my hands on. Generally Tesco due to the (now defunct) Fuel Save deal which saw me buy petrol at £1 per litre a few times. Evoranomics in action!

In France for Frolic, however, I was wary of many 95 pumps which offer only 10% Ethanol unleaded. Picked 98 ron on those occasions, and it ran happily and well...and dare I say it slightly more economically. Albeit hard to tell with so many trackdays lobbed in, but mway cruising at 80 was returning stratospheric mpg figures.

Most 98 ron was close to £1 in France anyway, so felt like I'd won a watch. Had an empty tank to fill at Calais, which was a fortunate coincidence

[twisted2fit]

update:
was on a trip with the rev limits group to monza. was filling up before driving down to meet them at the eurotunnel... car started misfiring..lost power..cel codes..i cleared the codes but no luck:-(
ended up driving to italy in my boring daily driver (lexus gs300-old mans car).
great trip..got the evora looked at and turned out to be a faulty spark plug:-) sputtering has been cured too:-)

[Al.]

I run my S on Nitro almost exclusively after being advised to by non other than Craig after car ended up in limp mode on with gunk from Tesco standard fuel. Over on TLF in Evora section there is a similar thread which has factory posts which basically say the N/A will not benefit from higher octanes but the S will, and not talking power only. Now do I see or feel any difference when the odd tank of normal goes in. No not at all. I get kangaroo petrol all the time and in all 4 owned over last 6 years. My trick has been to select sports mode even when cold and it solves the issue.

By the way the car has a 5K rev limit when cold. Even the change up lights work there. I just about shat myself first time I found it years ago as I wasn't watching speedo and knew I hadn't been anywhere near 7K.

Having said that he also said leaving my car sat in garage for 4 weeks like many offshore workers doesn't help. Fuel has additives and any general crap in suspension will settle out so gets sucked through in a single concentrated batch. The suggestion is it is better to leave the car almost empty for the 4 weeks as less to settle. Problems have never re-appeared so who knows. I don't do a high enough mileage to worry anyway.

[Dominic]

Having said that he also said leaving my car sat in garage for 4 weeks like many offshore workers doesn't help. Fuel has additives and any general crap in suspension will settle out so gets sucked through in a single concentrated batch. The suggestion is it is better to leave the car almost empty for the 4 weeks as less to settle. Problems have never re-appeared so who knows. I don't do a high enough mileage to worry anyway.

I thought conventional thinking was to leave tank brimming with fuel when parking the car up for a longer period. Fuel goes off through evaporation, so the more fuel and less air in the tank, the better. Also, a nearly empty tank will get condensation on the inside, which will rot the tank from the inside out. On that basis, I have always been advised that a full tank for parking up is best.

I doubt the issues come drop additives dropping, but more likely fuel going off. IMHO

[twisted2fit]

fyi

http://www.pistonheads.com/gassing/topic.asp?t=302977

[Lazydonkey]

Thorney Motorsport was sponsored by Tesco Momentum at the time.

The guy is a weapons grade ar$ehole and liar.

Other than that it's a fine piece of work.