Thread: 300Tdi turbo lag

My 300TDi did this when I bought it (2nd hand). MR Auto used to offer a "Tickle Up" service that altered the fuelling to get better spool up. Of course you could attempt this yourself using the instructions in the TDi tuning guides kicking around.

Other obvious things to check could include:

* Remove intercooler hoses and check for internal delamination (not obvious from the outside)
* Flush/Clean the intercooler internals
* Remove the centre muffler on the exhaust system and replace with a straight through pipe
* Check your airfilter is nice and clean

it might not have been tweeked yet........get rid of the centre muffler will help

oh and push down on the accelerator

Gunk on the turbo vanes; clean up might help.

I think it's had a tickle up, at least that was I was told....

Centre muffler eh....

How would I clean the turbo vanes ?????

Swapping out those hoses is a royal PITA took me ages last time I did it on my last ute.

Yeah come to think of it I haven't checked the air filter I'll do that !



Weeds I was pressing the pedal you smartarse ! It's the middle one yeah?

Adjusting the boost compensator has potential. I'm not sure how noticeable the change might be though... I did a small adjustment on mine and couldn't notice much, but I haven't got back to it yet. Might need further adjustment... Here is my understand (and why I thought it was an nice and easy low risk mod):

You can adjust the top screw in the boost compensator which allows more fuel BEFORE boost comes on. This should give a little more go off the line at low revs. The increased fuel should increase EGT slightly and subsequently spool up the turbo a little faster. Once boost is on, your adjustment is irrelevant and fueling is just as it was before.

As I said - I'm not sure how noticeable it will be, but it's pretty low risk even without an EGT gauge. As long as you don't see visible smoke out the back, you're pretty safe.

Have you seen the TDI tuning PDF? It is excellent.

Originally Posted by VladTepes

How would I clean the turbo vanes ?????

You have to remove the turbo and crack the casing. A good solvent to clean down the carbon and oil mixture coating the vanes being very careful not to spill any on the bearings or bend or damage the vanes.

Or you could do as I am going to do next timing belt, go to Graeme Cooper (or your local LR specialist) and have them clean it for you.

There is some pommy spray product you spray to some inlet somewhere that supposedly works.

B:efore you do anything, check that your accelerator cable is adjusted up. They have form for winding themselves loose. Some use a dab of sikaflex to hold it better.

Tickle-ups by previous owners can be an issue if my experience was anything to go by. I think each of the three previous owners gave it a tickle and by the third one it had stopped laughing.

Correctly adjusting the boost compensator has changed it from a lethargic bucket of puss that struggled off the line, vibrated it's way through the mid range and held desperately to the idea of maintaining a constant 100kph on a flat road. It was unfortunately only ever an idea.

Adjusting the plunger, then the star wheel and then the smoke screw correctly and in that order made a massive difference to all-round driveability. Will sit on 110kph all day long, even up most hills. Great off the line and mid-range is way smoother. Just more torque all round.

If you haven't owned it from new there is every chance it could need a re-adjustment and it could make quite s noticeable difference.

Or it might be something else entirely