RPM / MPG

Post by **Bobby Boucher Jr** » 26 Nov 2007, 17:16

Before going head first in to a gearbox exvhange i I woild realy like to know what the engine is doing when I hit the not so loud peddle?

1 is it possable to install a rev counter on to a 1.9 D (1X engine)

2 is 30 MPG good or bad (a friend had a standard 1.6TD twin cab 5 speed that ran about 45MPG)

van is a coveted 1.9 waserboxer 78ps running a 4 speed box.

old van is still around byt the owner don't want to break it (whay open a breakers yard then.

will the gearbox exchange be worth in with the price increasing every time I need to fill up.

Post by **toomanytoys** » 16 Dec 2007, 00:38

Sorry... what are you doing?
Its not clear from what you have written...

You have a 1.9D installed at the mo and its on what box?

You are thinking of fitting a second hand box from a 1.9 DG wbx..

What you need to do is find out what gearbox code you have and what the code of the other box is..
what hp is the 1.9D (presume not a td?)

30mpg ought to be better depending on what you are doing with it...
45mpg from a nearly new really fresh 1.6TD driven by your grandmother might be possible... 35 -40 more realistic...

Post by **windysurfer** » 16 Dec 2007, 11:26

Once you know what box you've got and what you are going to change to

you can check the ratios out at BY

http://www.brick-yard.co.uk/VehicleSpec ... fo/gbx.htm

and then work out RPM and Speed here

http://www.partsemporium.co.uk/rpm%20&% ... ulator.htm

Post by **andysimpson** » 18 Dec 2007, 18:56

changing gear ratios does not automatically mean lower fuel consumption. My td actually seems better at high engine but low loads.

Post by **HOT 1200** » 04 Feb 2008, 13:57

Hi, I dumped the 4 speed diesel box and fitted a 5 speed petrol'DW' box.

at 3,000 rpm, im sitting at 60mph, my 1.9 TDI gives around 38 to 40 mpg

Best I have ever done is 425 miles on a single tank of fuel.....
(70 mph, 5 people, camping gear and holiday stuff, fully loaded!)
Newquay (Cornwal) to the East Coat near Gt Yarmouth (Norfolk)

I find anywhere between 60 & 70mph very nice and comfy.....
At 75 to 80mph the engine sounds a bit strangled, at 80 mph Im doing 4,000 rpm......not exactly relaxed driving.......

I think my mpg's are good because im still running the Mk3 Golf boost pin which is all about economy.........

GaV