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Thread: Best way to adjust boost pressure

  1. #11
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    Quote Originally Posted by Blknight.aus View Post
    skip the blow off valve (thats a riceboy petrol thing you dont need it on a diesel and shorten the adjusting rod after you have a boost gauge that can handle 30+psi of boost wind er up then up the fuel after you get an EGT gauge.
    I think the blow off valve is set for 30psi
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  2. #12
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    Wink

    Are there any issues with this type of setup?, I've been running one of these for a couple of years now, on the flight deck of my County, and find it really handy to adjust boost on the run, or while heavy towing uphill. Of course I'm sure it's not legal, and not super efficient, because the fuel should be adjusted at the same time, but in current config, it does give higher boost - when the needle valve is wound out, is very easy to install, and cheap. It is also small and easy to hide in an accessable position. It can get a little noisy, in a nice kinda way, but it gives you the opportunity of higher boost/full military power when needed, then a return to standard, all while you drive.
    ........Cheers.....Gerry.

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  3. #13
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    Quote Originally Posted by 1103.9TDI View Post
    Are there any issues with this type of setup?, I've been running one of these for a couple of years now, on the flight deck of my County, and find it really handy to adjust boost on the run, or while heavy towing uphill. Of course I'm sure it's not legal, and not super efficient, because the fuel should be adjusted at the same time, but in current config, it does give higher boost - when the needle valve is wound out, is very easy to install, and cheap. It is also small and easy to hide in an accessable position. It can get a little noisy, in a nice kinda way, but it gives you the opportunity of higher boost/full military power when needed, then a return to standard, all while you drive.
    Realistically, there is no need to adjust, as when you tune your diseaseal, you should have the boost to optimum efficient boost level, then add fuelling according to exhaust gas temps and your done, then just drive off the throttle, I just fit these as its a very simple way of controlling the wastegate and its set and forget when left in the engine bay

    although, like V6 commodores with sports exhaust, it may have that added euphoria effect, when played with

  4. #14
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    Quote Originally Posted by rar110 View Post
    I think the blow off valve is set for 30psi
    If you mean the factory vent on the manifold, mine started venting at 15psi. It no longer rides with me.
    The part I don't get about adjustable boost controllers, is why would you ever want to reduce you peak boost?

    It's not going to save you fuel (it will waste more), it's going to cut power and torque. I just don't get it.
    If you want a "valet switch" to reduce power, then put a valve on the lin to the boost compensator on the fuel pump, drops power to just over non-turbo levels.

  5. #15
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    Quote Originally Posted by Dougal View Post
    If you mean the factory vent on the manifold, mine started venting at 15psi. It no longer rides with me.
    The part I don't get about adjustable boost controllers, is why would you ever want to reduce you peak boost?

    It's not going to save you fuel (it will waste more), it's going to cut power and torque. I just don't get it.
    If you want a "valet switch" to reduce power, then put a valve on the lin to the boost compensator on the fuel pump, drops power to just over non-turbo levels.
    It's not factory, was included by the installer as a safety in case of excess boost. I'm sure he said it was at 30 or 35 psi. I generally hear it in btw gear changes. He said overboost was the main reason Nissan patrol diesels blew.

    I bought the boost controller off eBay, will see how that goes. Also bought an Auber guage and 4 bar MAF. Dash will look like a Xmas tree with egt in red and boost in green coloured digits.
    L322 tdv8 poverty pack - wow
    Perentie 110 wagon ARN 49-107 (probably selling) turbo, p/steer, RFSV front axle/trutrack, HF, gullwing windows, double jerrys etc.
    Perentie 110 wagon ARN 48-699 another project
    Track Trailer ARN 200-117
    REMLR # 137

  6. #16
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    Quote Originally Posted by rar110 View Post
    It's not factory, was included by the installer as a safety in case of excess boost. I'm sure he said it was at 30 or 35 psi. I generally hear it in btw gear changes. He said overboost was the main reason Nissan patrol diesels blew.

    I bought the boost controller off eBay, will see how that goes. Also bought an Auber guage and 4 bar MAF. Dash will look like a Xmas tree with egt in red and boost in green coloured digits.
    Got a picture of it? I just had a look for your build thread and couldn't find it. I think I have fridge blindness.
    A lot of people think overboost is why ZD30's die, I think they're full of it. Overboost is the result of overfuelling and it's overfuelling which melts pistons.

    I have a spring mounted inlet manifold which I think will start to vent at somewhere around 30-40psi boost. I need series turbocharging to get that high as a single turbo capable of that won't fit in my engine bay.

  7. #17
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    Quote Originally Posted by rar110 View Post
    It's not factory, was included by the installer as a safety in case of excess boost. I'm sure he said it was at 30 or 35 psi. I generally hear it in btw gear changes. He said overboost was the main reason Nissan patrol diesels blew.

    I bought the boost controller off eBay, will see how that goes. Also bought an Auber guage and 4 bar MAF. Dash will look like a Xmas tree with egt in red and boost in green coloured digits.
    yes the mighty nissan engine...... the one with the bottom end that seems to be made out of tepid strudle when you compare it to something that rhymes with 4bd1.

    dump the blow off valve and if it runs off of a switched pilot feed use that feed to actuate the wastegate valve, then tweak your fuel pump to how you like it (I suggest 650 preturbo at 15PSI as your max sustained temp/presure with 700 your maximum peak temp) and never worry about it again.
    Dave

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  8. #18
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    Quote Originally Posted by Blknight.aus View Post
    yes the mighty nissan engine...... the one with the bottom end that seems to be made out of tepid strudle when you compare it to something that rhymes with 4bd1.
    Nothing actually wrong with the 3L datto bottom end, its when the airflow packs is in, it fuels the crap out of it, making massive boost and power (relatively!) smart owners turned up and the mechanics would get complaints of, excessive performance

    A 4BD1 will melt the pistons too.....but not seeing my mass airflow meter playing up anytime soon

  9. #19
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    Quote Originally Posted by rar110 View Post
    It's not factory, was included by the installer as a safety in case of excess boost. I'm sure he said it was at 30 or 35 psi. I generally hear it in btw gear changes. He said overboost was the main reason Nissan patrol diesels blew.

    I bought the boost controller off eBay, will see how that goes. Also bought an Auber guage and 4 bar MAF. Dash will look like a Xmas tree with egt in red and boost in green coloured digits.
    Your installer is not quite with it! one, it won't hit that sort of boost with a mechanical pump turned up a bit, otherwise you'd be blowing a mass of soot and alot would be straight out your wastegate! and no, overboost doesn't kill engines, you can cram 160psi into a diesel, but you need the fuel to create the bang, to spin the spinny thing to make the boost

  10. #20
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    Quote Originally Posted by rovercare View Post
    Nothing actually wrong with the 3L datto bottom end, its when the airflow packs is in, it fuels the crap out of it, making massive boost and power (relatively!) smart owners turned up and the mechanics would get complaints of, excessive performance

    A 4BD1 will melt the pistons too.....but not seeing my mass airflow meter playing up anytime soon

    yes but NOT from the overboost spike that happens when you go from full RPM full noise to full idle, something about a lack of fuel to make the heat.

    (which you picked up on in your next post.....)

    which is why I dont worry about the dump valve on diesels if the boost and fueling is sensible to being with.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

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