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bad economy with primium ? 

 

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 Post subject: bad economy with primium ?
Posted: Tue Jul 05, 2005 10:01 am 
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g'day cobbers

I switched back to regular unleaded fuel and noticed I got better economy. this is not a driving style issue as it happened before so this time when I did it I drove in a way that would usualy chew the juice.

Is this because I havn't retimed the old girl for the premium.

 

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Posted: Tue Jul 05, 2005 10:53 am 
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dunno some cars run better on uleaded than premium

i know my XR6 had ZERO performance/fuel econ increase with prem and this was running it for over 1 month

 

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Posted: Tue Jul 05, 2005 10:54 am 
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which is this in? the fairlane or F150?

 

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Posted: Tue Jul 05, 2005 11:00 am 
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in the fairlane the twuk runs straight gas.

here's the question is running premium with starndard timing like running regular with 6deg retarded timing. kinda makes sense

 

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Posted: Wed Jul 06, 2005 4:06 pm 
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No its not the same... Running premium fuel just allows you to advance the base timing more due to prevented pre-detonation. So running premium without advancing timing is just not using its full potential, not retarding the timing.



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Posted: Wed Jul 06, 2005 4:25 pm 
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mmmm i love my premium, gets 50 - 100 ks more :)

 

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Posted: Wed Jul 06, 2005 5:10 pm 
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Mohekn wrote:
mmmm i love my premium, gets 50 - 100 ks more :)


Thats the difference between a car fitted with a knock sensor, and one without :)

 

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Posted: Wed Jul 06, 2005 5:10 pm 
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whats a knock sensor?

 

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Posted: Wed Jul 06, 2005 9:52 pm 
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knock knock! :P

nar the knock sensor detecks detonation
so the ecu can advance the timing untill it knocks :)

 

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Posted: Wed Jul 06, 2005 9:54 pm 
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Waggin wrote:
Mohekn wrote:
mmmm i love my premium, gets 50 - 100 ks more :)


Thats the difference between a car fitted with a knock sensor, and one without :)


not really i get an extra 100k's when running premium in the ed and that doest have a knock sensor. with reg. i get 300 k's to a tank and with optimax i get 400+.

 

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Posted: Wed Jul 06, 2005 10:04 pm 
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i find that hard with the ed but maybe.
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Posted: Thu Jul 07, 2005 10:00 am 
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as I understand it the knock sensor allows the ecu to advance timing untill it detects a knock (duh!) so timing is always at optimum. my old fairlane has to go off what I tell it with timing which I havn't adjusted for premium or for the 180deg thermostat.

 

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Posted: Thu Jul 07, 2005 2:22 pm 
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nannas_ed wrote:
Waggin wrote:
Mohekn wrote:
mmmm i love my premium, gets 50 - 100 ks more :)


Thats the difference between a car fitted with a knock sensor, and one without :)


not really i get an extra 100k's when running premium in the ed and that doest have a knock sensor. with reg. i get 300 k's to a tank and with optimax i get 400+.


mate im exactly the same more like 350 ks and then 450 ks with Optimax

 

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