hey all,

I recently bought a Peugeot 307 2.0lt turbo diesel wagon.

It was owned by a heavy plant operator that decided to keep a full running history of all servicing (itemised receipts) and a spreadsheet of when/where re-fuelled, odometer readings and lt/100km and type of driving.

Its been averaging 7.1lt/100km for cbd/city commuting and 3.9lt/100 for open highway runs.

The efficiency drops significantly when driven in the 1000 - 1500rpm range, and really pumps fuel (compared to gentle driving) when over 2500rpm. Of course this means getting up to speed lifts consumption, then I can drop it back to plonk along at the speed limit.

Diesel-Power have a chip module which will up the Kw/HP figures by 18%.
A mate has used it in his diesel VW and has significantly dropped fuel consumption while increasing the vehicles power.

It seems to control timing and fuel flow.

I'd like to get better power at same or less fuel consumption at the lower rev range so I can get up to the speed limit quickly and efficiently, then drop back to cruising along.

How does it deliver this... e.g. more power for less fuel?

Another mate modified his V8 Commodore with the active fuel management (the variable cylinder type) by shifting the air intake to over the radiator and putting on extractors. With the computer that contols the amount of cylinders in use turned off he's getting better economy than with it on and without the mods.

I can understand this type of mod delivering more power and better fuel economy... but how does the chip do it?

long post.... detailed question for a ww forum... thought I'd try my luck here before going to an auto forum.

Guess I'm trying to work it all out and do the cost effectiveness figures before going mad on modifying chip and air flows.