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Another option is an XEDE interceptor module sold by Chiptorque, it will allow u to adjust fuel AND ignition timing, it will also allow u to run separate maps for petrol and LPG, and is very easy to set up for automatic switch over between fuels.
There are some good gains to be had adjusting the timing on LPG in these engines, particularly in the midrange areas that u spend the most time driving in. These are not cheap to by new, however they pop up on eBay from time to time. The extra cost is because it's quite easy to modify a simple Maf/map sensor voltage to change fuel mixtures, but it's a lot harder to modify a cam/crank angle sensor signal to change timing.
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