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Thread: 1.9 CDTi Performance and Big Nozzle Problem

  1. #1
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    Default 1.9 CDTi Performance and Big Nozzle Problem

    hello
    I agree from Turkey. I am batuhan
    I have gtc astra h 1.9 cdti 16v 150 hp. My vehicle has a hybrid turbo (17-56). Other spec's
    Oem air box & filter
    catalyst and hollowed out
    out of the middle and end silencers
    Ecufast custom remap
    AHM Performance Port-polish cylinder head, intake manifold, turbo manifold
    Oem Intercooler
    Oem injector nozzle

    My car is 230 hp 474 nm
    What else can I do in my car? Which should I choose, bosch nozzle.? (260-270) (please part code)


















  2. #2
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    Nice spec and good figures.
    Unfortunately comparing figures from one rolling road against another rolling roads is a bit futile.
    The very first mod I would look at is an uprated intercooler. It MUST be tube and fin and NOT bar and plate. Do everything you can to ensure the air has to go through the FMIC core. On the Vectra the air con condenser was in front of the O/E intercooler so I made the intercooler first in the line up.
    Get the air from the airbox to the turbo intake in the largest, straightest diameter possible. Same goes for the connections to and from the intercooler core.
    If you take the trouble to measure your existing air charge temperatures (just before the inlet manifold) I think you may be surprised by how quickly the ACT shoots up and it can easily be 70C.
    Anything that helps ambient temperature air easily into the air box is good.
    I do not have Astra experience but can you improve you O/E air box as we do with the Vectra?
    Run a K+N or similar air filter. It will not make more power but you can clean the filter with a cleaning kit every 5,000 kms. Filtration is of the upmost importance so stick with K+N. Gause and foam filters do not have as good filtration.
    A bigger MAF sensor may assist in making more power. For the Astra there is an 80 mm MAF which I think is 5 pin plug. Cost is £125 here in the UK. Modifying the existing injectors to flow a small amount more would also make power development easier.
    I see you have already ported the exhast manifold.
    Keep the hot bits hot and the cold bits cold.
    At this point you have gone about as far as you can on the existing turbo and you need a quality remap. To go further consider water methanol injection which in my experience will add around 12 bhp, run at 50:50. Do not exceed that ratio.
    After that you need to be looking to move on to a slightly different turbo if you really want to get the ultimate but with the mods in the order above I would guess you will be happy with the new found bhp and torque for a while.

    Batuhan : Where about in Turkey are you?
    If you want some shots of the engine bay in my wife's Vectra, my FMIC set up or water methanol injection, drop me an e-mail.
    harveysmith1@btopenworld.com

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    Regular Member nutron's Avatar
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    The standard injectors are capable of about 240bhp at max, the best way for you to safely go further is to fit a water/methanol fumigation system. Adding more diesel would result in increasing exhaust gas temps and could cause damage to the engine and turbo. Adding water/methanol would allow more power to be produced without raising the boost further and without smoking heavily if setup correctly.

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