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Thread: TD5 MAF Bypass

  1. 18th September 2010, 08:53 PM #1
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    TD5 MAF Bypass

    A new member has suggested that a bypass hose can be fitted to the TD5 to "sneak" extra air into the TD5 without the computer knowing.
    Any opinions on this from "THOSE IN THE KNOW"
    It concernes me that the engine could be running too lean under full load.
    see below.
    Andrew


    Quote:
    Originally Posted by disco_thrasher
    so i observed to day when i put the computor onto the nanocom the air flow would peak up to 650,00 then suddenly return to 000,00 and the fault will be created by that so does this mean the turbo is sucking all the air and maxing out the MAF which is causing it to fault
    cheers Kelvin

    That is exactly what is hapening Kelvin.

    Let me see if I can explain this correctly in English (I´m not a native speaker)

    There is a problem with the MAF voltage. Maf sensor as a default value and a maximum value of 4.9v. What happens is that with more air in the air filter box you raise the v value and the ECU simply cuts the injection untill the MAF v comes down to "normal values".

    Solutions:

    1 - Turning the MAF off - The ECU will work with default MAF Values
    2 - The bypass solution:







    3- What we, at td5inside, are trying to do is creat a small box (a bit like the turbo boost box) that allows this value to go up!

    Regards,
    Td5inside
    The Following 2 Users Say Thank You to td5inside For This Useful Post: Remove Your Thanks disco_thrasher (15th September 2010), LandyAndy (18th September 2010)
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  2. 18th September 2010, 09:46 PM #2
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    every time iv seen that happen is cos the maff it stuffed???

    but would like to be corrected

    i was at a a/c shop for work and said oh look at that td5 maf,, he said no thats out of a astra, it was identical?, semis and all?? may be the same maf, i will find out
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  3. 19th September 2010, 07:33 AM #3
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    unless i have been unlucky but this occurred on 2 brand new Land rover MAF and my 6mnth old one nanocom says its operating fine i am running a VNT turbo larger cooler so it is sucking a whole lot more i am at the moment in discussions with Jose (td5inside) and will hopefully have a solution soon as well as product
    cheers Kelvin
    Quote Originally Posted by stig0000 View Post
    every time iv seen that happen is cos the maff it stuffed???

    but would like to be corrected

    i was at a a/c shop for work and said oh look at that td5 maf,, he said no thats out of a astra, it was identical?, semis and all?? may be the same maf, i will find out
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  4. 20th September 2010, 07:07 AM #4
    Hamish71 Guest
    TD5 Alive have something similar...I posted a picture of it somewhere.....here it is:



    At least with the pictures above, I can see how this hose would be fitted. TD5 Alive are also working on a boost box that does MAF as well.

    Disco Thrasher.....what symptoms are you trying to cure with this?
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  5. 20th September 2010, 07:33 AM #5
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    i believe the turbo is not getting enough air and by feeding more in will allow it to operate at its peak ,i am also thinking a curefor this could be running dual snorkelsand the second air feed completely bypassing the MAF
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  6. 20th September 2010, 09:45 AM #6
    Hamish71 Guest
    ....but what is your disco doing that indicates there is a problem....other than a fault on nanocom?

    An easy way to test it, although not without some risk, would be simply to disconnect the crank case breather hose from the intake hose. It will suck in all the air it needs.....maybe too much given this would be without the restriction of the air filter...... not sure.
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  7. 20th September 2010, 02:12 PM #7
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    yeah i did remove it and it drove with 10 x more grunt and go ,so this is a reason why a secondry air flow source i think is required for these VNT turbos ,Maybe Tombie can comment on this as he has a VNT aswell and surely would be experience airflow starvation and if not your comments would be appreciated
    cheers Kelvin
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  8. 20th September 2010, 04:00 PM #8
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    i can see the problem with the vnt needing to much air, there are a colpe little mods you can do to the air box to try and get more air in,
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  9. 20th September 2010, 04:44 PM #9
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    Quote Originally Posted by stig0000 View Post
    i can see the problem with the vnt needing to much air, there are a colpe little mods you can do to the air box to try and get more air in,
    well come on dont leave me hanging tell us
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  10. 20th September 2010, 05:30 PM #10
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    Quote Originally Posted by disco_thrasher View Post
    well come on dont leave me hanging tell us

    you mean my mod's nic
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