LPG Conversion

[kth286]

I was under the impression that the reason for the introduction of the supercharged 4 pot engine was to give the car similar performance to the 3.2 litre 6 cylinder car; but with better fuel consumption.

My 3.2 litre 6 cylinder straight engine for the previous generation coupe gives 32 mpg over a 100 mile cross country journey using a mix of motorway and A + B roads.

I would therefore expect the same 36 ish mpg of the previous poster for the smaller engine.

The original poster probably needs to get a new lambda sensor (oxygen) and/or new coolant sensor.

These provide vital feedback to engine ECU for correct fuel injection quantity, and over time can get sluggish.

I changed both on mine and immediately had a 16% improvement in mpg.

 

[Motorvating]

I was under the impression that the reason for the introduction of the supercharged 4 pot engine was to give the car similar performance to the 3.2 litre 6 cylinder car; but with better fuel consumption.

My 3.2 litre 6 cylinder straight engine for the previous generation coupe gives 32 mpg over a 100 mile cross country journey using a mix of motorway and A + B roads.

I would therefore expect the same 36 ish mpg of the previous poster for the smaller engine.

The original poster probably needs to get a new lambda sensor (oxygen) and/or new coolant sensor.

These provide vital feedback to engine ECU for correct fuel injection quantity, and over time can get sluggish.

I changed both on mine and immediately had a 16% improvement in mpg.

The owners manual states 29 mpg combined driving, so about right. These CLK 230 Kompressors are thirsty brutes to say the least.

 

[Motorvating]

Don't forget to factor in the cost of petrol used to warm up the car, into your sums!

Understood, this is why it is a guestimate. It seams to kick over to LPG about a mile.

 

[Motorvating]

Intereting post, I always thought conversions were a lot more expensive? I have a CLK 230K and I drive a around 30K a year maybe its worth it? But I dont think my car is that thirsty really. I do a 300mile round trip once a week and I get 36mpg obviously on clear roads . I spend about £20 every 2-3 days

Apparently the costs have come down due to our Eastern European cousins forcing UK installers to reduce their markup, which was obviousley large because at £1,100 they still made a profit. On a LPG forum installers told me to be aware because it was to cheap, so there must be a catch somewhere, whilst at the same time bemoaning that they are having to reduce their prices due to Eastern European installers.