Thursday, Dec 18, 2008 at 14:21
[quote]
do you find the diesel gas system increases power - especially on hills etc and did you research all the different diesel gas systems and if so why did you choose diesel gas Australia.
Cheers,
GPM
[/quote]
Your more than welcome.
Yes Power increased on my F250 as per this dyno graph of two runs with and without the LPG switched on.
On the cruiser the power increase was greater - because it as a 1992 model it was pre clean air emissions controls date, so didn't have to undergoe the exhaust gas analysis test that the later 2004 F truck did!
As a result they could wind up the gas supply to higher levels and gain more power - where as with the F truck my settings are very low at around 10% ga,s so as to stay within allowable Exhaust gas emmissions.
At the time a couple years back DGA were the only converters in WA, so there was no research as to which company to use - the vapour system was used on the older cruiser and the slightly dearer direct injection on the F 250.
We did do some testing on the cruiser for mileage and costs with and without gas.
From memory there was a saving 2 years back when fuel prices were pre outragous levels we recenty saw, of 2c / kilometer
The cruiser cost back then $4100 to convert - less the state rebate of $1000 & Federal rebate of 2000 = $1100 out of pocket.
$1100 / 2c = 55,000kms to break even.
We did those 55,000 km's in the cruiser in the first 18 months and have been in savings these last 6 months or so.
Next plan is to intercool the cruiser and see how much extra HP and economy we can wring out of it.
Theres not a lot of point trying to do savings calcs with the F 250, because I haul a boat and trailer that weighs at least 4 - 4.5 tonnes at 100kph and get about 5 km's to the liter which is about 12
miles per US gallon.
Also - because the Ftruck is over 3500 kilos it doesnt qualify for the govt grants so you pay the whole $4500 conversion cost - and any savings in the maybe 1 c / km range means 450,000km's to break even!
Really it was about increasing power to be able to haul the load and get the extended range, it wasn't a "cost saving excercise" for the F 250.
Either way I remain happy with both conversions - with the exception that I don;t believe the claims made for cleaner oil - my used oil testng which i've postd about here before have shown the opposite.
There appears to be a real need to formulate oils specifically for these diesel gas vehicles, as many of the standard blends don;t hold up
well to the increased operating temps in relation to sulphation oxidation and nitration levels and that includes the so called miracle fully synthetic oils like
Mobil Delvac 1.
You can only tell this by used oil analysis testing.
Cheers
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