XANTIA CT Turbo lacking power boost.
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Thread: XANTIA CT Turbo lacking power boost.

  1. #1
    Fellow Frogger!
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    Default XANTIA CT Turbo lacking power boost.

    The '98 Xantia Turbo, Vin: VF7X16D00006D2664, I purchased recently is down on power compared to the similar car I had previously. There is not the obvious push in the back surge around 2,500 rpm that I remember.

    I can find no evidence of leaks from the turbo ducting, so what should I be looking at now please ?

    No obvious faults surfaced on the drive from Melbourne to Coffs Harbour 6 weeks ago , the 1,412 Km coverd at 7/6 Lt / 100 [ 37 mpg ], whilst maintaining all speed limits to the max..

    I am fueling with 98 octane with no ethanol.

    The timing belt, water pump, drive pulley, & idlers were all replaced prior to the trip.

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    Cheers,
    Richard

  2. #2
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    Hi Richard

    Very pleased to hear you have another Turbo CT. Is it a Series I or II? Did you consider the Series I on Gumtree at Lennox Head? Must organise a visit when I get mine registered .

    Re power loss: your fuel economy is good, so surely the compression is still good (and a healthy turbo boost can make up for a certain amount of compression loss). One thought would be exhaust - may not breathe as well as your previous one. I had a new system built by an an exhaust specialist recommended by Addo, and we found a large lump of the cat innards that had migrated through the centre muffler, and was caught up in the pipe between the centre and rear mufflers!! I still have it as a souvenir (the lump that is).

    Otherwise it might be necessary to visually inspect the turbo vanes and confirm that the blades are still the right size and shape...

    Just another thought - if your first one was Series I and this one is SII, perhaps the SII, being a bit heavier, does not have as much zip? I wonder if there is anyone out there who has owned both that can offer a comparison?

    Cheers

    Alec
    Last edited by Armidillo; 4th May 2016 at 03:01 PM.

  3. #3
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    Thanks for your reply Armadillo.
    The Lennox Head CT appeared after I had bought my Melbourne car. If I can find the time, I will try to have a look at it. Interior leather looks nice. Ironically, the same colour as mine, which I had never seen before in a Xantia.
    There were no series two CT cars imported here, & I don't think series 2 cars were produced with turbos, but I stand to be corrected. At '98 , my car is really a series 1.5 with the high level brake light in the boot lid & some variations in switch gear. Mine has a Command Controls LiteOn AP60 vacuum cruise control fitted which was not available from CitroŽn.

    Keep in touch please with your progress & experiences. Maybe a photo or two ?

    Richard

  4. #4
    1000+ Posts Ken W's Avatar
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    Hi Richard,

    Series II Xantia CTs were imported as the Xantia Activa - even more complication!

    I can think to two things to check.

    The turbo bypass valve is mounted separately on the exhaust manifold and is controlled by a linkage to a pressure capsule that is mounted behind the engine over on the drivers side. At rest with the exhaust bypass blocked, the lever should be retracted into the capsule. When the turbo get up to developing maximum boost, the ECU switches on a solenoid located behind the top engine mount to admit some of this pressure into the capsule, thereby opening the exhaust bypass to drop exhaust drive to the turbo. Check that the exhaust bypass system is free to move and is returning to the closed position at rest or at idle.

    Does the turbo spin smoothly? You could take the air input pipe (the one that goes over on top at the back of the engine) off the input to the turbo and see how the fan blades look and how it spins.

    Cheers, Ken W

  5. #5
    1000+ Posts garyk's Avatar
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    I have a 1998 Activa.

    From my (hard to compare) memory, the CT may be a more pokey beast, by a little bit.
    And I recall the BX GT to be gruntier still.

    But this is conjecture, to a point.

  6. #6
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    Blocked cat, mistimed engine (pinned off a slipped damper), loose throttle cable.

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    1000+ Posts forumnoreason's Avatar
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    btw I just counted TEN Xantias up for grabs on gumtree. Great time to get into the market for unloved nice cars.
    sparkey likes this.

  8. #8
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    I count 12 (not counting the C5 hiding among the Xantiae) - and 11 are autos . But there is a 3 litre V6, which is surely rarer than the Turbo CT!!

    Cheers

    Alec

  9. #9
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    Hopefully my Turbo CT will be on the road shortly. Almost dealt with all the necessary issues before inspection. As far as I can tell, it's 6 years since it was last registered. I'm looking forward to comparing it with my 206GTI.

  10. #10
    1000+ Posts Ken W's Avatar
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    Hi Richard,

    If the checks I suggested earlier come out OK, connect up a boost gauge either permanently or temporarily to see if any boost is being generated or use a Lexia/Diagbox computer to see what pressure the ECU manifold pressure sensor is measuring during a drive.

    On full throttle, you should get good boost between 2500 and 4000 rpm before the ECU opens the turbo bypass valve and the engine then crawls to 6000 rpm.

    I am surprised about the vacuum powered cruise control on a turbo car unless it has the optional vacuum reservoir installed. If it hasn't and you start to use boost on cruise control, the vacuum capsule will start operate opposite to how it is supposed to and the system would become quite unstable e.g. instead of accelerating the car, it would start to decelerate it.

    Regards, Ken W
    Last edited by Ken W; 4th May 2016 at 10:41 PM.

  11. #11
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    Thanks to everyone who has replied, I will be experimenting today to see what I can find. It feels like the bypass valve is seized in the open position as there is no detectable boost at 2,500. Not sure how to free the valve if it is seized, as it looks like it is not going to be much fun to remove.

    Ken W, the cruise control wasn't working when I bought the car & I have only just diagnosed it's problems [ I hope ] & am waiting for a sensor coil to arrive. Command Controls ,the distributors, were very willing to email diagnostic & service sheets on it. They suggested the vacuum reservoir if it proves unsatisfactory under full boost.

    Cheers,
    Richard

  12. #12
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    i have a vacuum cruise control (Command Control) on my CT with a reservoir tank and it all works perfectly, easily holding 80 kmh in fifth up a reasonable incline. Cheers, Robin

  13. #13
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    Thanks Robin, if I experience dropout with the cruise control I will chase you for details on your installation.

    Cheers,
    Richard

  14. #14
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    Woopidoo ! I've just discovered another two cylinders in the CT by freeing up the turbo waste gate. It was jammed securely wide open preventing any boost reaching the inlet manifold. The push in the back at 2,500 rpm from that giant hand is addictive & what the CT is all about. No need to push above the flexible 2,500 rev range around town , but when you really need to move it is there at your right toe. Why the waste gate was jammed fully open remains a mystery, as in all normal running, & when idle, it sits pulled closed by the actuator.

    Many thanks to all who responded to my request for advice. That's what the Aussiefrogs family is all about.

    Cheers,
    Richard
    JohnW, forumnoreason and Ken W like this.

  15. #15
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    Great result!! Now you can really enjoy it. Cheers, Robin

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    Is the CT turbo hard on clutches? The second clutch was installed at 50k km Sydney driving. Now has just had its third clutch fitted at 169k Km.The last 100k km having been open country driving and Wagga Wagga traffic- hardly stop start. How long have your CT clutches lasted? One symptom of worn clutch was lack of that push in the back.-only slipped at about 2500rpm

  17. #17
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    Our CT has done almost 179,000. Still on original clutch. My niece drove in and around Melbourne for the first 70k, and since then a mix of town & country running. Still no sign of problems. Cheers, Robin.

  18. #18
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    My car is still on it's original clutch at 230,000 as far as I can see from the service records. However, it requires full travel & takes up very late, so although not slipping, I suspect I will be up for a replacement soon.

    On the subject of cruise control in my earlier post, after swapping the valves in the vacuum actuator & replacing the sender coil at the axle, it is now working. Haven't tested it on a long run run yet to see how it handles long sustained climbs without vacuum tank backup.

    Cheers,

    Richard

  19. #19
    1000+ Posts Ken W's Avatar
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    The clutch on my Activa lasted about 270kkm which included lots of highway driving and was still OK when the release bearing eventually pulled out of the pressure plate. When I took the gearbox out, clutch was well worn and having a disconnected the release bearing did made it easier to remove the gearbox anyway.

    Cheers, Ken W

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