possible turbo problem

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flatlander

flatlander

It's not broken!
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I have fitted a 200tdi in my 90. I turned the cold side of the turbo through 90 degrees to improve clearance, as helpfully suggested on the Glencoyne site. All looked in good condition, with little free play in the bearings, and no blade damage.

I have now fitted a turbo boost gauge (mechanical type from ETB). Boost only reaches 0.4 bar maximum. The new short inlet tube and large filter shouldn't be causing a restriction, and the exhaust is nearly straight through. The waste gate appears to close with a satisfying click when I operate it by hand.

Any suggestions, or is it yet another bit I have to replace?
 
Thanks for the suggestion. I have checked that the spring is holding the wastegate closed, and that it moves freely. All seems OK, the wastegate arm only just starts to move as the pressure approaches 0.4 Bar.
 
Of the waste gate is opening then it won't reach a greater boost pressure, if you are 100% sure it's correct then not enough fuel, does it smoke? If not the problems fuel related.

If your at 0.4 bar foot down and you have lots of smoke then the turbo isn't boosting so again waste gate not set correctly or you have a leak on a boost pipe or vacume pipe.
 
I've found the answer - I'm an idiot!

I ran the test parked up, just revving the engine. When I went out for a drive the boost went up to 3/4 Bar, about 10 psi, which is (I think) within limits.

When I thought it through, a working engine will have a much more forceful exhaust stream, so turbo can work OK.

Thanks for your time gents.:)
 
flatlander said:
I've found the answer - I'm an idiot!

I ran the test parked up, just revving the engine. When I went out for a drive the boost went up to 3/4 Bar, about 10 psi, which is (I think) within limits.

When I thought it through, a working engine will have a much more forceful exhaust stream, so turbo can work OK.

Thanks for your time gents.:)
Click to expand...
Thats a common mistake and a trick often used to try and convince the seller that their turbo is not boosting properly to get the price down. Works about 50/50 in my experience and I've bought some nice cars cheaply ;) even from so called experienced dealers.

Proper way to check is to find a long gradient on a fast road and floor the pedal in a high gear at reasonable speed. Should give you genuine max boost. Look for black smoke which is overfuelling. A small puff when the pedal is floored is OK as its just the turbo catching up but continuous smoke is not.

Its something to do with one of them fancy named scientific laws (boyles, hobsons, murphys etc) which calculate the latent energy in moving and heated gasses.
 
To see just how much I could get I disconnected the supply to the dump valve actuator, clamped the tube, and ran up a slope near me. Boost reached 1.5 Bar before I chickened out - I'm only 1300 miles into running in!

Thanks for the exhaust suggestion, but I've got a new SS exhaust, built by Demand Engineering on the truck. Straight through apart from a cherry bomb type silencer, short and clean bends. No wonder it spooled up so well!:D
 
You'd be surprised at the levels of boost you can get out of a boggo standard turbo. Its just a matter of whether the rest of your engine can take it. I run 1.4 bar max on my TD5 with a larger intercooler and remap but I know somebody who runs over 2 bar on theirs with no apparent problems. Dont know too much about the tdi engines though as I've never had one to play with.
 
Shifty1962 said:
You'd be surprised at the levels of boost you can get out of a boggo standard turbo. Its just a matter of whether the rest of your engine can take it. I run 1.4 bar max on my TD5 with a larger intercooler and remap but I know somebody who runs over 2 bar on theirs with no apparent problems. Dont know too much about the tdi engines though as I've never had one to play with.
Click to expand...

Shifty was wondering why you guys have lower boost on your defenders? Here in yank land they are boosting up to 35psi before we get into the red zone on our boost gauge.

Or could it be part of the detune program to lower the HP on them, because there is more HP in them motors than is being released
 
Thor1950 said:
Shifty was wondering why you guys have lower boost on your defenders? Here in yank land they are boosting up to 35psi before we get into the red zone on our boost gauge.

Or could it be part of the detune program to lower the HP on them, because there is more HP in them motors than is being released
Click to expand...

might be a longevity thing ?


Or possibly for emissions ?
 
Was reading about the puma motor (07,08) and as being a ford Fan looked at it. was for comerical use and was detuned back to about 100hp as the insurance companys don't want high hp in defenders and have them geared to about the 75MPH mark or below.

As they saw the problems with the USA fenders when they were here as our express ways run posted 70 mph and traffic flow running upto 80MPH. cops usually do not stop you unless you do over 80.

So think it is more a safety/insurance issue
 
I was under the impression the landy engines, the TDIs anyway were detuned so they would run well on poor quality diesel.

is it the tdcis that actually have an ECU limiter on them?
 
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