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 Post subject: sorry for a silly question
Posted: Thu Jul 20, 2006 3:14 am 
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if i have a duel set up, and running gas, is the ecu used for? the ecu only works when petrol is running (to control the injectors)

am i way off? sorry ..bit late and tired

 

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Posted: Thu Jul 20, 2006 3:22 am 
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ecu is still used for engine managment, eg timing etc, and depending on model car also trans

EF-L tickford gas vehicles run different fuel maps and trans maps depending on which fuel is run LPG or ULP

 

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Posted: Thu Jul 20, 2006 4:29 pm 
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what if you have an aftermarket setup (non tickford)
i have a xr6

 

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Posted: Thu Jul 20, 2006 4:33 pm 
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theblackone wrote:
what if you have an aftermarket setup (non tickford)
i have a xr6


ECU will still be controlling ignition timing - but the timing maps wouldnt be any different to those used on petrol.

Also stuff like thermo fans, smartlock etc are dependant on the ECU.

 

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Posted: Thu Jul 20, 2006 5:42 pm 
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so tuning the car on gas would be done by tuning up the mixtures...?

also with the ingition timing.. would there be any difference from gas to petrol?

is there a performance difference if timing is different on gas?if there is how would u go about changing it?

haha sorry about 3248230 questions

 

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Posted: Thu Jul 20, 2006 5:48 pm 
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theblackone wrote:
so tuning the car on gas would be done by tuning up the mixtures...?


Yes. Im not terribly familiar with LPG tuning but i understand its the convertor or the mixer that is adjusted to provide the appropriate flow of gas.

Quote:
also with the ingition timing.. would there be any difference from gas to petrol?


If the ignition timing control is being handled by EEC - then no, i wouldnt expect there to be any difference between the ignition timing on gas and LPG.

Quote:
is there a performance difference if timing is different on gas?if there is how would u go about changing it?



LPG is usually of a higher octane. Although im sure there are other factors at play - other things being equal, you should theoretically be able to run a fair bit more timing advance on LPG compared to regular unleaded.

To go about changing it - ideally you would have an ECU that switched spark maps depending on wether petrol or LPG had been selected. Very difficult to do using exisitng hardware....

Altho...

The new CAPA chip coming out for E series falcons apparently has 4 selecteable programs. So theoretically you could switch between 2 of these depending on what fuel you were running the car on.

Would be pretty cool hey???

 

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Posted: Thu Jul 20, 2006 5:58 pm 
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LPG has a higher octane rating but burns cooler and puts out less energy per litre, which is why it is gutless, and requires a higher volume of fuel is consumed.
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Posted: Thu Jul 20, 2006 6:40 pm 
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interesting, i doubt that when the person i bought it off got the aftermarket gas, there wasnt anything changed in the ecu.

whens that capa thing coming out?

 

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Posted: Thu Jul 20, 2006 6:55 pm 
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theblackone wrote:
interesting, i doubt that when the person i bought it off got the aftermarket gas, there wasnt anything changed in the ecu.

whens that capa thing coming out?


Your guess as good as anyone's :)

http://www.fordmods.com/forums/viewtopi ... highlight=

 

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Posted: Fri Jul 21, 2006 2:31 am 
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YTMONT wrote:
LPG has a higher octane rating but burns cooler and puts out less energy per litre, which is why it is gutless, and requires a higher volume of fuel is consumed.


I dispute that lpg is gutless, most people cant tell the difference with most modern systems these days. I drive an AU Falcon 6 and bugger all difference between my wifes AU on ULP. My Sons EL Falcon beats my wifes and mine off the lights and keeps pulling hard and that runs on LPG with a tickford lpg ecu so is better tuned to run on LPG

 

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Posted: Fri Jul 21, 2006 11:08 am 
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AU99 wrote:
YTMONT wrote:
LPG has a higher octane rating but burns cooler and puts out less energy per litre, which is why it is gutless, and requires a higher volume of fuel is consumed.


I dispute that lpg is gutless, most people cant tell the difference with most modern systems these days. I drive an AU Falcon 6 and bugger all difference between my wifes AU on ULP. My Sons EL Falcon beats my wifes and mine off the lights and keeps pulling hard and that runs on LPG with a tickford lpg ecu so is better tuned to run on LPG


*Shrug* I've driven both and I can tell you PULP feels much better.
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Posted: Fri Jul 21, 2006 3:05 pm 
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then theres liquid injection which changes everything, more power than ULP and cheaper to run as well but install cost is twice the price of standard LPG set up

 

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Posted: Fri Jul 21, 2006 4:05 pm 
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YTMONT wrote:
AU99 wrote:
YTMONT wrote:
LPG has a higher octane rating but burns cooler and puts out less energy per litre, which is why it is gutless, and requires a higher volume of fuel is consumed.


I dispute that lpg is gutless, most people cant tell the difference with most modern systems these days. I drive an AU Falcon 6 and bugger all difference between my wifes AU on ULP. My Sons EL Falcon beats my wifes and mine off the lights and keeps pulling hard and that runs on LPG with a tickford lpg ecu so is better tuned to run on LPG


*Shrug* I've driven both and I can tell you PULP feels much better.


I cant tell the difference between ULP and LPG on my LTD. I'll be graphing it on the Dyno soon.

 

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Posted: Fri Jul 21, 2006 5:19 pm 
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When someone gets a LPG conversion, is the ECU changed at all?

And would it be better to get a Tickford LPG ECU instead? (for an XR6)

 

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Posted: Fri Jul 21, 2006 10:02 pm 
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My tests with an LPG ECU are at: http://www.fordmods.com/forums/viewtopi ... hlight=lpg .

 

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