I've just finished a fairly accurate mpg check and thought it would of been a little better tbh.
I've had a dynachip remap and EGR removal but am still only getting 22.5 mpg, this is a combination of short runs and motorway driving (55-60mph). I'm not too fussed but thought it would of been slightly better? Any ideas appreciated.
1. Are you sure the mpg calculation is correct? Are you brimming the tank then doing at least 300 to 400mls then brimming the tank again, so that you have an accurate measure of the fuel used, as well as the distance covered?
2. If no.1 is accurate, what percentage of distance travelled is motorway?
3. When on motorways, does the autobox go into Torque Converter lock-up mode at approx 55mph? It feels like it's going into a higher gear and the revs drop.
4. When was your air filter last changed? If in ANY doubt, change it now.
5. When was the MAP last cleaned? If you don't know, do it now.
6. When was the ECU red plug last checked/ cleaned? If in doubt, do it now.
In my opinion there is a design fault with the TD5 autobox, namely the torque converter (TC) used. With all torque converters there is a design parameter called "stall speed". This is the rotational speed at which 100% of the input power reaches the output. Now with the TD5 version of the TC, the stall speed is 2600-2800rpm. In other words below those rpms, there is constant slip and loss of power through the gearbox to the driving wheels - therefore inefficiency, therefore poor mpg.
However, on the v8 autobox the TC is larger and with a stall speed of 2200-2400rpm. This means that with this TC you are more of the time within a more efficient band of power transmission.
Wouldn't it be nice if you could put this v8 TC into a TD5? Would it be even nicer if someone did a kit for this conversion including a stronger faceplate?
Well there is!!!!! See here :
http://www.ashcroft-transmissions.c...nverters/td5-heavy-duty-torque-converter.html.
I've driven a couple of TD5's with this modification and it totally transforms the vehicle. It feels more connected, less revvy, more powerful and just so much better. Not cheap but very good.
Cheers
Dave
!!
