Thread: Turbo Lag?

You can do the first stage of the pump tweak without needing an EGT gauge. it's quite simple ( if you can count ).
Also, get the timing checked. Timing belt may be out a notch or stretched. And the turbo hoses for delamination and leaks as mentioned.
Check the simple things before forking out the big $.

i had 98 300tdi and had Davis Perfomance Landies do a turbo mod, made a huge difference. Give Bruce Davis a ring (0296791978)to find out if they still do the mod.
cheers Ecka.

I'd love to hear peoples thoughts on moving the Turbo boost pressure sensing point, from the outlet of the turbo to the end of the Plenum Chamber (alloy inlet manifold) just above.

My thinking here could be in error, but never the less here we go. As I understand the boost is sensed at the outlet of the turbo to max out at 1 Bar standard, but because of pressure drop/resistance through hoses & intercooler it may not be quite 1 Bar at the plenum chamber or indeed the engine inlet valves???

I'm not real keen in over boosting and lowering reliability but I am keen on being sure I get the FULL 1 Bar boost where its needed. .... You thoughts Fella's???

Originally Posted by Gaiabloke

I'd love to hear peoples thoughts on moving the Turbo boost pressure sensing point, from the outlet of the turbo to the end of the Plenum Chamber (alloy inlet manifold) just above.

My thinking here could be in error, but never the less here we go. As I understand the boost is sensed at the outlet of the turbo to max out at 1 Bar standard, but because of pressure drop/resistance through hoses & intercooler it may not be quite 1 Bar at the plenum chamber or indeed the engine inlet valves???

I'm not real keen in over boosting and lowering reliability but I am keen on being sure I get the FULL 1 Bar boost where its needed. .... You thoughts Fella's???

Plenty of people have done it.

Actually they should read 1-1.1 bar, mine used to run right on 15.5psi at the turbo outlet. (installed a big exhaust and the boost pressure increased by 1-1.5psi just by lowering the back pressure)

Changing the position of the wastegate actuator hose to the plenum is no different to changing the wastegate actuator rod to give 1-2 psi more boost.
Same result, different method.

I don't quite understand moving the pressure line to the inlet manifold.

Say you've got 15.5 at the turbo and 14.0 after the intercooler at the manifold, won't there be a drop in performance if the IP is fuelling for 14 PSI charge than 15.5?

Originally Posted by rick130

Plenty of people have done it.

Actually they should read 1-1.1 bar, mine used to run right on 15.5psi at the turbo outlet. (installed a big exhaust and the boost pressure increased by 1-1.5psi just by lowering the back pressure)

Changing the position of the wastegate actuator hose to the plenum is no different to changing the wastegate actuator rod to give 1-2 psi more boost.
Same result, different method.

Ahh you've answered my question, disregard my above post. So we're talking about the wastegate actuator, that I can understand.