What's your 200Tdi boost pressure? - Defender Source
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  #1  
Old December 11th, 2015, 07:44 PM
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What's your 200Tdi boost pressure?

Installed a boost gauge into the plug in the intake manifold, getting about 7 psi max. Seems a bit low. What's your gauge reading?
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  #2  
Old December 11th, 2015, 07:46 PM
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Seems low to me as well. I have seen about a max of 15 out of mine. Not sure if it matters but that was at altitudes between 4200' and 9000'.
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Old December 11th, 2015, 08:19 PM
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IIRC, the spec in the manual is 13 psi. First make sure the waste gate is free and closing fully. If that is not the problem the fueling is too low.

Make sure the throttle is opening fully.

How is power? How fast can you go?

Any visible smoke?
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  #4  
Old December 11th, 2015, 08:48 PM
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It's a new turbo John. 12 psi at the wastegate T says the manual but not sure if there is a drop in psi reading from the manifold.

Shortening the actuator arm have any bearing on this? As it is now, when the wastegate is closed the hole in the arm is 1/2 diameter of the pin shy.

Power is ok, runs a little rough since the slight timing tweak, really need to do the belt soon and get that all sorted.

it'll probably do 70, 65 for sure, need more straight rd, in short supply here.

A little smoke up hill or a punch
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Old December 11th, 2015, 08:56 PM
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There should not be much pressure loss unless the intercooler is plugged.

Check when the waste gate opens separately.

Make sure the fuel supply is good first. Check the lift pump and make sure the fuel filter is new. Make sure the throttle opens fully.
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Old December 11th, 2015, 10:01 PM
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also....check where you mount the Boost gauge sensor - and look for leaks in the line to the gauge. But you should see max boost around 12--14
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Old December 11th, 2015, 10:54 PM
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Gene,
Try this. Put a T on the intake manifold where you are pulling your boost signal from and run your waste gate signal from that T. Ie the waste gate will actuate based on the actual pressure @ the manifold. Keep the pressure line to the injection pump right off the turbo, for best performance.
I have found this to be the optimal setup for a tdi. When the turbo makes so little boost one wonders why the engineers even ran with a waste gate @ all.
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Old December 11th, 2015, 11:09 PM
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So...I'll just jump in here since I can't seem to keep my mouth shut (apologies) but the pressure drop between the output of the 200tdi and the intake is minimal, well below the accuracy of a boost gauge. Unless you have some kind of ultra-precise gauge.

If the boost is low, then adjust the wastegate actuator. It's very simple. You really only have a problem if you can't increase the boost by adjusting the wastegate actuator. Just set it to the book value and you're good.

I love my 200tdi but I find it amusing that people talk about tuning it like it's a 4G63 or something. It's a super tiny turbo on a weak engine with, at its best, less horsepower than a Honda Civic.
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  #9  
Old December 11th, 2015, 11:35 PM
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Funny, you bring up a 4G63 Ed. I've been seriously debating putting one in a Defender. Wonder how it would perform.
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  #10  
Old December 11th, 2015, 11:36 PM
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Not necessarily. It can also be lack of fuel. It isn't pretty easy with these to have the peak boost controlled by fuel. As Doug has shown you can force the waste gate to never open and it is hard to ever get over 15 psi.
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Old December 11th, 2015, 11:45 PM
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Quote:
Originally Posted by Red90 View Post
Not necessarily. It can also be lack of fuel. It isn't pretty easy with these to have the peak boost controlled by fuel. As Doug has shown you can force the waste gate to never open and it is hard to ever get over 15 psi.
Makes sense to me. But that must be a helluva lack of fuel to not spin up a t2 hotside

I'm not trying to argue with you or Doug - you guys know about 1000x more than me regarding these engines.
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Old December 12th, 2015, 12:05 AM
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It is easy to see just by backing off on the the throttle. You barely back off and the boost drops right down. This is why it is important that the throttle is opening fully and the max fueling is set right.
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  #13  
Old December 12th, 2015, 12:40 AM
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John, I flushed the intercooler when I replaced the turbo and the fuel filter is new.
I'm not following this: "Check when the waste gate opens separately." I'm assuming it's opening when the gauge maxes at 7psi, is that not the case?

And the throttle opening fully--are you referring to the adjustment of the cable to arm atop the IP or internal?

Jonesy,
The gauge is a mcnally, pressure sensor and wires. plumbed with pipe dope, should be airtight but wouldn't hurt to hit it with some soapy water and rev.

Sonoronos,
I'm hoping it's as easy as the actuator, I'll try that first.

Doug,
So, plug at "B" and run a hose from A to a "t" at the sensor, do I have that right? (That pic is starring the old turbo)
Thanks for all the input everyone, I'll give it a whirl later today.
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  #14  
Old December 12th, 2015, 12:46 AM
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It is not necessarily opening at 7 psi. I was suggesting you rig up a test and pressurize the diaphragm on its own and watch when it opens.

If it is opening at 7 then simply shorten the arm adjustment.

If it is opening at the correct pressure of 12 or higher then you have a lack of fuel.

With the pedal to the floor check that the pump lever is tight to the full open stop.
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Old December 12th, 2015, 12:55 AM
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Ok, got it John. Thanks again.
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  #16  
Old December 12th, 2015, 02:01 PM
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The throttle range checks out. Adjusted the actuator and got the gauge to read 12. Much more peppy now. Re-adjusted valve clearances too, a few were opened a bit much, running smoother now.

Thanks again for the input.
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Old December 12th, 2015, 03:21 PM
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I have taken the rod loose, threaded the end off and shorthened the rod by about 3mm and then put it back together adjusted as short as it would go.
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