Most accurate place is off the inlet manifold. Most peeps take it off the wastegate operating tube which can read several psi higher than what is reaching your engine. Mine has a 3psi difference across the intercooler at full tilt (and no there are no leaks before anyone asks).
There is no point turning up the turbo on a TD5 as the ECU will register an "overboost" error at a little over 1bar and switch to limp mode until you recycle the ignition. If you want to run higher boost pressures then you need an electronic gizmo to fool the ECU into thinking the turbo is boosting lower than it really is. Got mine from TD5Alive.
very good questionive got the gauge plumbed into the diaphram pipe on the turbo and on full acceleration i get 1.4 bar on the gauge, i havent got one of the boxes to trick the ecu, but i dont get the ecu registering overboost, its a 1999 defender, it has allard intercooler and silicone pipes all new, so how come it allows it to boost upto 1.4 bar
Hi John thats 1.4bar at the turbo diaphragm as shown on your gauge. I'd bet if you were to connect the same gauge to the inlet manifold where the boost pressure gauge sits it will read closer to 1.0bar bearing in mind that most cheaper boost gauges are none too accurate. Also the boost pressure sensor can get get clogged up with all the black sooty gunge that the EGR system pumps into your inlet manifold which may be giving a lower reading to the ECU. Have you checked the ECU error log recently for overboost errors?
My boost gauge take off is in the core plug that sits in the back end of the inlet manifold. Purpose made for the job.
Welcome To LandyZone, the Land Rover Forums!
Here at LandyZone we have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.
Registering is free and easy just click here, we hope to see you on the forums soon!