106 octane race fuel?

[graham_172]

anyone tried using race fuel in the clio?

http://www.santapod.co.uk/m_detail.php?ProductID=99&Category=6

must be good for a few horses!

 

[Henry]

only if the car's set up to run on it i'd have thought. ignition timing would need advancing to take full benefit.

BP were offering 102/3 RON (i believe) at selected forecourts a while back - £2.50/litre..

 

[graham_172]

but if you ran 10ltrs of 106 and 10 ltrs of bp/shell norm then i think it could cope?

 

[Martin]

tried it ...no benefit, unless you map the car on it.

 

[CHRISK172+]

Porsche 911turbo running BP102.....re-mapped to use the fuel gave peak increase of 100BHP over 98 ron. Seen this on Dyno live at Donny. Reason I remember this is my wife answered the question on the Peak gain and won me 1/2 an hour track time

 

[Ali]

tried it ...no benefit, unless you map the car on it.

4bhp to be precise! We had some left over from a race meeting! fired it in the old 172! Smelt wonderful!

 

[franx]

Does'nt the ecu "learn" and adjust itself after running a couple of tanks of a higher/lower octane?

With my (ex)Scooby i really had to have a minimum of 98, anything lower and it went funny. Higher and it ran like a train, a very fast train

 

[GordonD]

Does'nt the ecu "learn" and adjust itself after running a couple of tanks of a higher/lower octane?

Put in lower octane fuel than the ECU was tuned for and you'll get knocking. The knock detector signals the ECU and it backs off the timing to stop the knocking and save the engine from danage from it. But it doesn't have any way of knowing you've put higher octane fuel in.

So if you are going to regularly run higher octane fuel than the pump fuel it was tuned for by Renault, fill it up with that higher octane fuel, get it remapped for that, and it'll still run pump fuel. Without that remapping there might be a slight power increase thanks to the blend of the fuel producing cleaner combustion, but it won't be much.

(The only worry I have with remapping for higher octane is that I don't know what range of octanes the ECU can deal with. Maybe someone else knows. If its tuned for 95 octane, and can adjust for anything down to 90, if you retune it for 100 octane does that mean the worst fuel it can cope with is 95 octane. And if you can't get at least that you may damage the engine. I was a bit worried about that when I got mine remapped, then found that in outback Australia you can only get low octane fuel. I took a couple of drums of 98 octane in the boot in case that occurred, but carrying extra fuel is now an offence in outback Australia because you might be "trafficking" petrol to the Aborigines. The kids are willing to pay high prices for high octane city petrol because they sniff it, whereas the petrol they can get in the outback is a special blend they can't sniff.)

 

[edde]

Porsche 911turbo running BP102.....re-mapped to use the fuel gave peak increase of 100BHP over 98 ron. Seen this on Dyno live at Donny.

Thats a turbo though to get 100hp extra they bumped the boost up.

With my (ex)Scooby i really had to have a minimum of 98, anything lower and it went funny. Higher and it ran like a train, a very fast train

Yep the scoobies are sdesigned for better fuels so run badly on lower ROn fuel that they need.

 

[Big Bob]

may be daft question but why cant you just run 106 without ecu work as the lambada sensor will return rich figures and match the air flow and injector timinig i thought that was the point of lambda sensora.

 

[edde]

may be daft question but why cant you just run 106 without ecu work as the lambada sensor will return rich figures and match the air flow and injector timinig i thought that was the point of lambda sensora.

It won't return a rich reading its the resistacne to det the RON means not any amount of rickness.

 

[Big Bob]

may be daft question but why cant you just run 106 without ecu work as the lambada sensor will return rich figures and match the air flow and injector timinig i thought that was the point of lambda sensora.

It won't return a rich reading its the resistacne to det the RON means not any amount of rickness.

what in english please

it reads richer it retards injector opening to compensate yes

but why not just run in closed loop all time why go open loop.

 

[edde]

It won't return a rich reading its the resistacne to det the RON means not any amount of rickness.

what in english please

it reads richer it retards injector opening to compensate yes

but why not just run in closed loop all time why go open loop.

In simple terms it won't give a rich etc reading as your not putting in any more fuel the fuel with higher RON just will resist being squashed more before it self ignites.