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  1. #1
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    Boost controller yes or no??

    Hi folks just been browsing threw ebay as we all do and spotted this AUDI A3 A4 A6 A8 TT TURBO BOOST CONTROLLER GAUGE KIT 2 on eBay (end time 11-Oct-10 16:25:11 BST) ive got a 1998 a3 1.8t totally standard, Do u think its worth me getting a boost controller just to tweak the power a little till i get some serious money to spend on her? Just one more thing does any one no wot the standard boost pressure is on these engines and how much can you turn this up by safely?

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  3. #2
    Andrew@A.L.D's Avatar
    Cylinder Head Master

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    In one word... Don't !!
    RIP S3dave/David Marshall stickers now available

    FOR SALE
    None resonated Milltek exhaust,
    Adjustable FPR from 1-5 bar, 2 sets of Unused ARP 3/8 2000 rod bolts, relentless 200 cell cat pipe, Std AGU Crankshaft. Ported & Reconditioned Cylinder head service.

  4. #3
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    why is it that bad?

  5. #4
    Andrew@A.L.D's Avatar
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    Because you forcing more air into the engine without adding fuel or timing causing the engine to run lean and damage the engine
    RIP S3dave/David Marshall stickers now available

    FOR SALE
    None resonated Milltek exhaust,
    Adjustable FPR from 1-5 bar, 2 sets of Unused ARP 3/8 2000 rod bolts, relentless 200 cell cat pipe, Std AGU Crankshaft. Ported & Reconditioned Cylinder head service.

  6. #5
    Welly's Avatar
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    And, to be fair, it won't work well anyway. The standard map expects x amount of boost. You change the boost delivery to y. The ECU sees the change, calculates it is getting more than it has requested, and hits limp mode.
    ------------------------------------------------------------------------------------------
    "Marriage is like a coffin and each kid is another nail."
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  7. #6
    Prawn's Avatar
    My other car is a MINI!!!!

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    yea, avoid boost controllers on a standard car.

    I tried it on mine years ago, and whilst it made it MUCH faster, it ran lean, ran rough, ran hot, and was surgey as hell and awful to drive on part throttle.

    All round BAD idea.

    Remaps are only 250 these days!
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    Prawns TFSI Turbo'd 1.8T Track Car

    But I know nothing so ignore me.

  8. #7
    S3 D2HTY's Avatar
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    The ecu will just dump ALL the boost its making to protect the engine. Dont do it you wont see any gains more likely to see worse performance.

  9. #8
    Prawn's Avatar
    My other car is a MINI!!!!

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    Quote Originally Posted by S3 D2HTY View Post
    The ecu will just dump ALL the boost its making to protect the engine. Dont do it you wont see any gains more likely to see worse performance.
    No, this isn't true.

    you WILL see performance gains, but it's a very bad idea.....

    being a 98 1.8T it'll be an AGU engine, they don't have a map sensor, and the DV is 100% mechanical, so aside from the N75, the ecu has no control over boost.

    If you fit an MBC, even inline with an N75, there is no way the engine will be able to dump any boost at all. All it can do is pull out timming when it see's knock and hope for the best!

    Not safe
    -------------------------------------------------------------------------------------------------

    Prawns TFSI Turbo'd 1.8T Track Car

    But I know nothing so ignore me.

  10. #9
    Welly's Avatar
    VX220 SC Driver :)

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    Quote Originally Posted by Prawn View Post
    No, this isn't true.

    you WILL see performance gains, but it's a very bad idea.....

    being a 98 1.8T it'll be an AGU engine, they don't have a map sensor, and the DV is 100% mechanical, so aside from the N75, the ecu has no control over boost.

    If you fit an MBC, even inline with an N75, there is no way the engine will be able to dump any boost at all. All it can do is pull out timming when it see's knock and hope for the best!

    Not safe
    Agreed, the AGU calculates boost via airflow and TB angle. It's actually surprisingly accurate.

    Both my AGU A3 and the S3 when using MBCs, under an overboost condition cut the spark to the coil on cylinder number 1. This stops the engine being used at all until you turn off ignition.

    When you take away the ability of the ECU to control boost, it will stop you from using the engine in another way if it deems necessary for self protection.
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    "Marriage is like a coffin and each kid is another nail."
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  11. #10
    S3 D2HTY's Avatar
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    My bad didnt read it properly

 

 

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