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Thread: Two Level Boost

  1. #81
    Meddy Guest
    Quote Originally Posted by Nicely
    OK. To throw a spanner into the works...

    It does the spike when running with the EBC off and just the actuator adjusted up. It also does it with the EBC bypassed through my own finely adjustable version of the Apex Performance boost valve...

    A thought has occured to me about something which may *possibly* have an effect. I'll try it at lunchtime. Its off on a complete tangent, but is linked to the car's boosting...
    How do you have the actuator set its not bottoming in the can is it? Can you bung on a OEM one?

  2. #82
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    I tested the actuator with the adjustable on the old turbo. The new turbo has the OEM fitted...

  3. #83
    Meddy Guest
    Quote Originally Posted by Nicely
    I tested the actuator with the adjustable on the old turbo. The new turbo has the OEM fitted...
    Ah well ok thats my ideas done with then.

  4. #84
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    You see my problem... Its a head and brick wall thing...

    So, should boost creep be a gradual thing rather than instant, like I've got?

  5. #85
    S15R Guest
    stock manifold will spool the turbo up faster than an aftermarket equal length manfiold

  6. #86
    Meddy Guest
    Quote Originally Posted by Nicely
    You see my problem... Its a head and brick wall thing...

    So, should boost creep be a gradual thing rather than instant, like I've got?
    If its the wastegate just struggling then its going to be gradual as it will just slowly build as engine load does.

    Thats why everything points towards something in the control circuit. Theres just nothing mechanically I can think of that is going to so suddenly give spiking.

  7. #87
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    I just eliminated my idea. Disconnected the power to the carbon canister solenoid. No change

    Fart. Don't really want to get another EBC.

    EDIT: Actually, I've just realised. I haven't completely bypassed the EBC. I ran the boost valve in parallel... So the EBC could have been leaking at the same pressure level Damn! Got no way to test just the valve as I've go no stand alone boost gauge and the EOM only goes up to 1 bar...

  8. #88
    yewei Guest
    hey nicely, thanx for the advice n showing the steps of removing the mani i have only remove 2 screws from the heat shield, got 3 more to go, which is a pain in the ass becos they won't loosen up, and to make things worse. seems to me head of the screws have become "round" how am i ever going to remove the heat shield? cut it open?

  9. #89
    Derek Guest
    Nicely, I have Tubular manifold and Turbo Elbow now fitted with few days. I'm holding a steady boost of .7bar now. I was boosting a little high. 1.4 and 1.5 but that was down to me. I had the Boost pipe Tee'd into the pipe running into the Carbon canister where i have found out that there's no Vacuum in.

  10. #90
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    Quote Originally Posted by Nicely
    What settings do people have their Profecs or SBCs set to boost and gain-wise?
    For my Profec B, the high boost is set to 1.1 bar (this somtimes spikes to 1.2 on occasion - once and only once on a cold night - it hit 1.35 ). Low boost - never use it but it's set to .8 bar. Gain? It's set to max! - wind it right off the dial .

    Boost unsurprisingly comes on real quick!
    What do you call a Rx7 with reliability, decent build quality and a better exhaust note? - a specR S15!

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