Fw: Fw: [Diy_efi] The Hunt effect

[Geoff Harrison]

Hi Don.
I think it's worth a try. Mind you, if your engines stock at 8.4 to 1, 93 
RON may be high enough. I was comparing 91 to 95 RON, (which has a price 
difference of 7 cents/lit) on a 8.5 to 1 comp ratio. The apparent reduction 
in temp may come into play.

If you have improved the C/R, it's definitely worth a try. I mentioned 
Vortex as  having a cleaning agent in it. BP also has a similar additive. 
Shell probably has too.
I used to use a product called Fuel Doctor. It seemed to work. Don't need to 
mix it now.

I can go 8000K between oil changes. The oil is still "brown" At 5000K it's 
still golden, so I am reluctant to toss it out. (Motor's done 310,000 Km.) 
To me that indicates it's a clean burning fuel, and that must help economy. 
The exhaust is always clean also.

Geoff

----- Original Message ----- 
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 10, 2005 11:07 AM
Subject: Re: Fw: [Diy_efi] The Hunt effect


> On Monday 10 October 2005 08:44, Don Sauman wrote:
>> Does this apply when Premium ULP (98 octane) in Perth is between 8
>> to 10 cents per litre dearer than standard ULP (93 octane). I have
>
> 7 cents around here; last I checked.
>
>> 5 lt V8 VN that is giving a freeway mileage (kilometerage???) of
>
> fuel consumption. :-)
>
>> 12.7 l/100 km on standard ULP driven hard. Do you think I would
>
> Since when can you put in any freeway km driven hard around Perth?
> :-)
>
>> see at that rate any cost benefit in moving to Premium ULP.
>
> The engine is sufficiently-new so that it should be able to take
> advantage of the higher Octane.
>
> Depending on your driving style, it might take 2 tank-fulls to get
> the full benefit. City driving with low Octane in a high-output
> engine tends to gum up the work a bit. An "Italian tuneup" can be
> used to blow out the cobwebs earlier; but don't try it unless you
> know that the engine is in otherwise good condition.
>
> Changing from ULP to PULP reduced fuel consumption an average of 10%
> on my Golf GTI (1990 model); which made it worthwhile even when fuel
> cost around 80 cents/litre. The change from PULP to 98 didn't make
> what I would rate a significant difference in terms of fuel
> consumption, though it did delay the onset of ping/knock.
>
> The 98 RON is a nominal figure btw. I've been informed by some
> people in the industry that the actual fuel batches are closer to
> 100 RON, sometimes even on the high side.
>
>
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