new member, oxford uk; diesel honda civic

[rob.e]

Originally Posted by UFO

I also would not expect to get better mileage "leaning" the mixture at light loads because diesels always run lean; reducing the map at light load would simply reduce power forcing the driver to apply more fuel via the accelerator.

I've had the revised map on the car for several weeks now and it's definitely using less fuel to travel at the same speeds as before - see my pic above, with a warm engine, constant speed, i have achieved up to 99mpg. No way i could get it that high previously.

My overall average is not much difference, as i'm finding it hard to avoid using the additional performance i get with the new map, but when i'm really doing my best (driving style) for mpg then it is easier to obtain high numbers, and the max i can achieve is greater than before based on my non-scientific experimentation

[rob.e]

Originally Posted by euromodder

LPG ..

It's possible
But not worth the cost & effort

That kit that cripplerooster posted looks interesting - its 500 quid plus id want to get it professionally fitted, say another 250 ish, and it doesn't look like the kit includes a tank? Maybe it'd be somewhere near £1000 fitted? So how do i work out the pay back on that? Harder than calculating payback in a petrol/lpg conversion in that i wouldn't run solely on lpg, but mixed with the diesel..

I do 28-30k miles a year, with spend on diesel currently about £200-£250 a month.

How to work out what the savings could be with that lpg kit? Ideas?

[euromodder]

See how much diesel you can replace with LPG

Calculate
What the £ savings in unused Diesel are over 100miles
minus
What the extra LPG costs for 100 miles


You know how many miles you do/year
That gives you your savings/year

Then see what the installation would cost
Divide by the savings/year and you know when you'll start making a profit ...
Gonna be a while I'd think


LPG tanks will be cheaper (lower pressure) than CNG
You'll normally need an extra MOT after installation
Probably extra periodic tests as well under EU regulation R110

[euromodder]

Originally Posted by rob.e

I do 28-30k miles a year, with spend on diesel currently about £200-£250 a month.

At that fairly high mileage, it might work out

Remember you'll need a fair bit of LPG to replace 1L of diesel


AGS LPG en CNG-installaties AGS DieselMix AGS DieselBlend AGS Diesel+LPG AGS Diesel+CNG AGS Dieselgas

This calculates in € , km and in L
Under dieselmix, fill in LPG price

no need to fill in tankinhoud (tank size)

brandstofverbruik per 100 km = fuel use (in L) per 100km

hoe lang = how long you want to use the car

[rob.e]

Thanks ^ that's a good tool. (had to use google translate to get the meaning but got there in the end).

It's pretty much what i've already concluded, very similar numbers.

I could potentially save around 300-600 a year in fuel costs if i had a lpg mix, but conversion cost is 1,500 so it'll just take too long to pay back, so not economically viable.

[rob.e]

.. still interested in the ORBIS wheels though - that would be an awesome addition on the rear of the honda. diesel hybrid ev

Orbis have a new product on their facebook page - exhibited at SEMA earlier in Nov. No info on their website though, and no response to question on the FB page

[UFO]

Originally Posted by rob.e

I've had the revised map on the car for several weeks now and it's definitely using less fuel to travel at the same speeds as before - see my pic above, with a warm engine, constant speed, i have achieved up to 99mpg. No way i could get it that high previously.

My overall average is not much difference, as i'm finding it hard to avoid using the additional performance i get with the new map, but when i'm really doing my best (driving style) for mpg then it is easier to obtain high numbers, and the max i can achieve is greater than before based on my non-scientific experimentation

I am sure you are correct in that the engine is using less fuel for travel at the same speed, my only point was it is not likely that the map was simply "leaned". There are other measures that can be taken to make a diesel engine more efficient, like modification of injection timing and fuel injection pressure, but diesels are completely different than gasoline engines where the air-fuel ratio in controlled.

[cRiPpLe_rOoStEr]

Originally Posted by rob.e

I could potentially save around 300-600 a year in fuel costs if i had a lpg mix, but conversion cost is 1,500 so it'll just take too long to pay back, so not economically viable.

How long do you expect to keep this car? IIRC there were less-stringent traffic restrictions for vehicles fitted with those kits in some areas where the emission ratings are being used as a reason to exclude some vehicles.

[rob.e]

Originally Posted by cRiPpLe_rOoStEr

How long do you expect to keep this car?

another 2 yrs maybe?

currently has 120k miles, adding 30k miles a year, so in 2 yrs time i'll be up to 180k miles.. if i did lpg and it took 3 yrs to pay back it would be 210k miles before i would be in "profit".. by which time there may be other mechanical issues to consider.

[euromodder]

Originally Posted by rob.e

I could potentially save around 300-600 a year in fuel costs if i had a lpg mix, but conversion cost is 1,500 so it'll just take too long to pay back, so not economically viable.

I'd have gone for it if I had a 3 year break-even period
For me at then current prices, it was double that or even longer

I went all CNG later on