Timing Sprocket Question

Hi guys

I mite be barking up the wrong tree here but i am having bad mpg problems with only 18 mpg ( 1988 90 2.5TD / defender 200TDI ) ok the 90 is fitted with 265 special track tyres, pump has been tweaked, and i have a strait through exhaust fitted but would have thought i would still get into the low-mid 20's even with this lot on.

i have only had the car since February this year and a few months ago i replaced the timing belt aswell as give it a good service but when i was changing the timing belt i noticed that both the cam and fuel pump sprocket's was 300TDI sprocket's so what i want to know is do the defender 200TDI a 300TDI sprockets all have the same number of teeth, the engine seams to run ok but this has always stuck in my mind or am i worrying about nothing as reguards the sprockets

How tall are the new tyres compared to the ones you had on before? as that will mess up the speedo readings.
When I first bought my 90 tdi it had 29 inch tyres on it and speedo was pretty much spot on, once did 315 miles to tank of derv, now has 33 inch tyres and might squeak to 250 miles just goes to show how far out it can mess up the speedo reading, so the mpg are still in the same ball park but the speedo would have you believe otherwise
How do you know its got 300 pulleys?

lynall said:

How tall are the new tyres compared to the ones you had on before? as that will mess up the speedo readings.
When I first bought my 90 tdi it had 29 inch tyres on it and speedo was pretty much spot on, once did 315 miles to tank of derv, now has 33 inch tyres and might squeak to 250 miles just goes to show how far out it can mess up the speedo reading, so the mpg are still in the same ball park but the speedo would have you believe otherwise
How do you know its got 300 pulleys?

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####in ell forget what i said what a dick i am i have just looked at some pic's from when i did my timing belt and they are 200TDI pulley's but i must have got mixed up with the pic's i have of my old 300tdi disco pulley's i had and in my head i thought this engine had the 300TDI pulley's

All this heat its bad for you

Haha