Boost gauge take off
- Thread starter Gooders70
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Shifty1962
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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.
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.
Thanks shifty, next stop alive tuning but I want to see what the boost is before and after etc, glad you say inlet side as that's going to be the easiest to do as I'm going to drill and tap a hole in the egr deletion pipe flange and screw in a take off there.
By the way I was checking out the waste gate on mine and it sits slightly open at rest, would it be better adjusted to be closed at rest?
Thanks
By the way I was checking out the waste gate on mine and it sits slightly open at rest, would it be better adjusted to be closed at rest?
Thanks
ive 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
drewster
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very good question
Shifty1962
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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.
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.
hi Shifty, no egr fitted past 2 years, the map sensor is clean, codes havent been read since it was remapped but boost hasnt been wound up since then either. it doesnt drive like there's a fault, since fitting the larger cooler its flying,lol, its just the difference of 0.4 bar or 5.8psi seems a lot to loose somewhere, but it drives well so im not complaining
Shifty1962
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Yes I know what you mean. Mine has a full size Allisport intercooler and is boosting at about 1.2bar or 18psi at the manifold which makes it run just like a sewing machine. It was running at nearly 1.5bar but I decided to trade reliability for all out get up and go so I turned the wick down a tad. It still shows a clean pair of heels to most other Defenders and Discos that care to chance their luck. 
Shifty1962
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Way too expensive for my wallet! I guess if you have deep pockets and are into extreme performance or the Paris-Dakar then why not but for road use probably not worth the effort and expense. Mine is plenty good enough for what I need and can still tow a large trailer with ease.
