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United Petroleum Premium 100 - Suitable For R34's?

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Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

It's fine. But unless it's the only fuel available, there's no point in using it.

91 all the way for a DE. There will be little to no benefit running 98 or 100 ron fuel.

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

10:1 is hardly high compression.

A 2ZZ-FE in a base model Corolla is 10.0:1 and requires 91 only. A Lancer VR-X is 10.5:1 and only requires 91. XT Falcon, 10.3:1 and only requires 91.

I'm not sure what makes the 25DE require higher RON fuel?

iamhe77 Grand Master

iamhe77

Posted
Posted

"Requires" and "runs best on" are two very different things though.

My VQ35de Stagea is 10.3:1 comp and requires a minimum of 95 although I will only be using the United 100 (and maybe a 98 every now and then).

The Wife's 380is 10.0:1 and "requires" only 91, but I can tell you that there is a massive difference when you run 95 and then an even larger jump when running 100 (as per the timing advance and engine load display via Torque on my phone).

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

Aren't the tuned for the use of Japans fuel?

Which is higher in octane than here?

They are the AU delivered ones, and of course a Falcon. They require 91 RON that we get here.

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

"Requires" and "runs best on" are two very different things though.

My VQ35de Stagea is 10.3:1 comp and requires a minimum of 95 although I will only be using the United 100 (and maybe a 98 every now and then).

The Wife's 380is 10.0:1 and "requires" only 91, but I can tell you that there is a massive difference when you run 95 and then an even larger jump when running 100 (as per the timing advance and engine load display via Torque on my phone).

I think you'll find it's mostly placebo affect.

Most ECUs don't have enough scope for self tuning to make any user of higher RON fuel. Note, I said most. I'd be surprised if an RB25DE could.

iamhe77 Grand Master

iamhe77

Posted
Posted

I too would be surprised if the RB25de ecu could make use of the higher octane fuel, but no harm in using a better fuel for a couple of bucks per tank IMO.

No placebo effect with regards to the two cars listed above (particularly the 380 - cleaver little ecu that one) although I am talking about 2005 ecu's as opposed to a late 90's ecu.

iseekool Veteran

iseekool

Posted
Posted

RB25DE on an R34 requires minimum of 95RON - Says on the manufacturer's brochure and on the manual. But if you need emergency fuel, I can't see any reason why 91 would cause major issues for short term use.

Oddly enough I still get some pinging on 95 and throttle response is not as crisp :unsure:

I always fill 98 myself - No pings and better economy. But I must stress the price of 98 will not make it cheaper to run vs. running 95.

Filling up with 100 or higher is a waste imho.

I believe by filling 98 you will be hitting the limits of the stock ECU and sensors - Filling 98 just guarantees you are definatly well within the 95+ range.

mad082 Grand Master

mad082

Posted
Posted

Aren't the tuned for the use of Japans fuel?

Which is higher in octane than here?

pretty sure their base fuel isn't any higher than here, they just have a premium fuel that is higher than what we have here. so they still have 91 octane fuel over there.

Tai1or Made Grand Master

Tai1or Made

Posted
Posted

pretty sure their base fuel isn't any higher than here, they just have a premium fuel that is higher than what we have here. so they still have 91 octane fuel over there.

Ahhh ok.

Marc, you really need to stop posting useful shit.

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