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Thread: Blanking my EGR, Would it be worth it??

  1. #1
    Regular Member paul_sri150's Avatar
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    Default Blanking my EGR, Would it be worth it??

    just after a little bit of advice lads.......

    just thinking about blanking my EGR off, however my car(cdti 150) spends most of its time up and down the motorway running around 2000rpm so was just wondering would it really be worth doing

    thanks

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    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

    Default

    Do you have any problems with your EGR...?

    If not, then "don't fix owt that aint bust"... but if you are having issues then I have done mine and its been spot on.

  3. #3
    Regular Member paul_sri150's Avatar
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    nah havent had any issues, but prevention is better than cure as they say ha!

    as you say tho if it aint bust.....

    Just thought it it may have given better performance, but it gets a good blow out on motorway everyday so should be ok, very rare i do lots of short journeys

    spot on vec btw dan!!

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    Regular Member winnie2457's Avatar
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    Mine been blanked for over 11500 miles and no probs car runs sweet

  5. #5
    Full Member Vaux-Man-G's Avatar
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    Quote Originally Posted by paul_sri150 View Post
    nah havent had any issues, but prevention is better than cure as they say ha!

    as you say tho if it aint bust.....

    Just thought it it may have given better performance, but it gets a good blow out on motorway everyday so should be ok, very rare i do lots of short journeys

    spot on vec btw dan!!

    For prevention, why not just add the Fiat gaskets which is what I did to the dad's CDTI 150.

    Surely allowing little soot through is better than allowing sheet loads through?


    Bye bye Vec B
    - Hello Siggy!

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    Default

    I don't wish to Hi-jack this thread (perhaps merging with the 'other' one would be better?).

    But there are several things to consider before you go ahead and raise your exhaust gas temperatures.

    I refer you, again, to this atricle.

    http://www.bankspower.com/techarticl...t-is-important

    "We've already mentioned that excessive EGT can cause engine damage or turbocharger damage, but let's get more specific. Which parts will fail first is a matter of the design and materials used in the various parts of the turbo-diesel, but usually it starts with the turbocharger. Under sustained excessive EGT, the square corners at the outer ends of the vanes, where the material is thinnest on the turbine wheel, can become incandescent and then melt, resulting in a rounding off of the square corners. If you or your mechanic finds this indication before anything more serious happens, consider yourself very lucky, because shortly after the tips melt, the turbine wheel goes out of balance and wipes out the turbocharger bearings, which may or may not result in shaft failure and destruction of the turbine and compressor wheels. Excessive EGT can also erode or crack the turbine housing. In extreme cases, high EGT can drive the turbocharger into an overspeed condition that exceeds the designed operating speed due to the additional heat energy. When this happens, either the turbine wheel or the compressor wheel may burst. If the turbo doesn't go first, excessive EGT, if sustained, will damage the pistons. Such damage can include piston deformation, melting, burning, holes, cracking, etc. This damage is cumulative, so if you slightly burn a piston top, the engine may continue to run without problems, but the next time you run excessive EGT more damage may be done, and so on, until failure occurs. Piston failure can be catastrophic -- that means very expensive. At a minimum, an engine overhaul will be required, and that too is expensive. Excessive EGT can also cause exhaust manifold and cylinder head cracking. Exhaust valves can fail from high EGT as well. Among the first engine parts to suffer damage will be those made of aluminum since aluminum has a lower softening and melting temperature than steel or cast iron. Diesel pistons are aluminum, and a growing number of diesels also use aluminum cylinder heads."

    If you're OK with all of that.........

  7. #7
    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

    Default

    Quote Originally Posted by diesel dog View Post
    I don't wish to Hi-jack this thread
    Why stop the habit of a lifetime eh

    I still say that the proof is in the pudding with the CDTi (we don't give a **** about Renault DCi's) and ALL those that have done it (yes, ALL) have had no problems - only good things - so I would still say if the EGR is fine leave it, but if people are having issues with it, then its a good option with the VX CDTi (and a few others I have done this on for 000's of miles).

    There has been NO reports (yes, thats NO) of issues with a VX CDTi engine due to the EGR being blanked - no need to say how many issues have been caused with them sticking open though .

  8. #8
    Full Member Vaux-Man-G's Avatar
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    I must say though, I can definately see both parts of this debate, having been advised by someone completely independant of this forum about the comments made by DD.

    But I disconnected the EGR on my dads car a few weeks ago and the performance was back to normal.

    Interesting..............


    Bye bye Vec B
    - Hello Siggy!

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    Quote Originally Posted by Dan_BlackSRi View Post

    There has been NO reports (yes, thats NO) of issues with a VX CDTi engine due to the EGR being blanked - no need to say how many issues have been caused with them sticking open though .
    It's the valve sticking open that causes the carbon build up.

    Very few actually blank their EGRs (you would have thought everyone would have done it by now), so it's no surprise that we don't hear of any official reports either good or bad.

    The problem is that you never get to hear about the bad side of modifying. You just notice that those that used to post don't bother to any more.

    Suffice to say that VX are well aware of the problem that Renault had with its dCI engines (who wouldn't be?) and are tackling the EGR valve and Swirl flap problem as they see fit. Merely turning off the EGR is not an economically viable option.
    Last edited by diesel dog; 25th June 2010 at 14:24.

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    Quote Originally Posted by Vaux-Man-G View Post

    But I disconnected the EGR on my dads car a few weeks ago and the performance was back to normal.

    Interesting..............
    Is it a petrol engine?

    If the EGR valve is faulty then performance will be restored if you have by-passed it. Not a problem on non-turbo petrols as long as the timing can be altered sufficiently to prevent detonation, otherwise over-heating and engine damage can occur.

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