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Thread: cold side relocation done, now boost gauge is reading lower?

  1. #1
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    cold side relocation done, now boost gauge is reading lower?

    Hi All,

    As title really, I've done the cold side relocation (as shown in the pic) and now the boost gauge is reading max 12 - 13 psi on full boost.

    The car doesn't actually feel like it's boosting less than before, I just wondered if this was normal?

    Boost gauge is T'd into top of the DV.

    Thanks!


    IMG_0298 by russwuss, on Flickr

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  3. #2
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    I could be totally wrong and probably am, but shouldn't the boost guage be t'd in elsewhere such as the manifold.
    B5 v1 Tip, Relentless v2 Manifold, Beach Buggy Hybrid, Pipewerx D.P and cat bypass, Miltek resonated cat back, AH Fabs v2 Intercooler, S2000 Filter, 83mm 9.5:1 CP Pistons, Brute Rods, Bosch 550cc Injectors, Oil Catch can, N249 delete, B5 Phenolic Gasket.
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    some people T it from the FPR, others (and me) T'ed it from the vac line that comes off the top of the DV
    2001 1.8T Quattro Sport 89k covered ARY engine.
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    What did it read before? Is it mapped?
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    Quote Originally Posted by Lavis89 View Post
    some people T it from the FPR, others (and me) T'ed it from the vac line that comes off the top of the DV
    Same here, mines T'd into the vac line on top of the DV that goes to the inlet manifold - it did read perfectly fine before, about 20 - 21 psi on full load but since doing the cold side relocation it's changed :-/

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    Quote Originally Posted by Dani_B19 View Post
    What did it read before? Is it mapped?
    About 20 - 21 psi, yep it's stage 1 r-tech remap. Car doesn't feel like it's under boosting at all.. Just can't explain the change.

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    Vac leak, faulty boost gauge, caught vac line feeding boost gauge, DV fitted right way round?
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    DV is definitely fitted right way round, I'll check all the others at the weekend - hopefully will be fitting a catch can. Cheers for the tips!

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    getting the vac line going to the boost gauge snagged is always a good shout, i managed to do it... twice... on the same day....
    2001 1.8T Quattro Sport 89k covered ARY engine.
    Remapped at Badger 5, 213bhp - 235lb/ft torque.
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    Soon to be done: SAI delete, Install the toyosport FMIC i have kicking about in my living room

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    leaking dv?
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    pressure drop through the intercooler?

    but your still reading the pressure from the inlet manifold... don't know
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    Cheers for replies all!

    I'll check for snags on the boost gauge feed this weekend, DV shouldn't be leaking.. Brand new one fitted in March, any easy way to check it for leaks?

    Pressure drop through intercooler is possible isn't it? I've got custom made alloy pipes for the intercooler and the cold side outlet is just welded onto there (not sure if you can see on the pic) N75 is still going to normal place on the charge pipe with the DV port blocked off.

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    I've got loads of vac hose, so I'll T into fpr line and see if it makes a difference.

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    Quote Originally Posted by russwuss View Post
    Pressure drop through intercooler is possible isn't it?
    Well that was my instant thought reading your OP

    But boost gauges are normally tee'd into the top of the DV (as yours is), which is essentially reading the inlet manifold pressure which is the same regardless of whether you have a cold side relocation or not. Maybe the pressure on back side of the diaphragm/piston makes a difference... but it shouldn't.
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    Please don't tee into the fpr line, it needs to be left alone as you don't want anything messing with your fueling, if you do then your penis will shrivel, your hair will fall out and you will start supporting man city.
    Best guess is either something has been disturbed during the installation or it's a dodgy gauge which isn't unheard of.
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    How do you know you had 20/21 psi before fitting the gauge?

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    Quote Originally Posted by S3 zombie View Post
    How do you know you had 20/21 psi before fitting the gauge?
    The gauge has been fitted for a few months, the reading changed from 20/21 psi when I installed the cold side relocation.

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    Quote Originally Posted by slowcoach3 View Post
    Please don't tee into the fpr line, it needs to be left alone as you don't want anything messing with your fueling, if you do then your penis will shrivel, your hair will fall out and you will start supporting man city. Best guess is either something has been disturbed during the installation or it's a dodgy gauge which isn't unheard of.
    message received haha.

  20. #19
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    right, got some time today to look and think i've found the issue... the nipple under the inlet manifold was cracked, literally touched it with my hand to check the condition of the pipe and it came off........ does this mean i need a new inlet manifold or is there some other way to fix it?

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    Could drill and tap it for a hose tail fitting?

    Think May still have some with a 5mm nipple in my garage from when made my inlet mani

    If interested and can find them your more than welcome to one
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  22. #21
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    sure its broke off and not just fallen off?

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    Quote Originally Posted by StaceyS3 View Post
    Could drill and tap it for a hose tail fitting?Think May still have some with a 5mm nipple in my garage from when made my inlet maniIf interested and can find them your more than welcome to one
    I've never used a tap in my life.... :-/Is the ones you have the same as this one? 1/4 Bsp X 3/16 = 5 mm Brass Hose tail x 1 b154 | eBay so, do I need to drill, then tap a 1/4" bsp thread and the hose tail will screw right in? :-)Sorry for the dumb questions... Brother may have one of these hose tails and taps at work but if he doesn't I would be very interested in one from you :-)thanks!

  24. #23
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    Quote Originally Posted by s3dave View Post
    sure its broke off and not just fallen off?
    Yep I'm sure.. nipple was still in the hose

    ImageUploadedByTapatalk1386943710.274224.jpg

  25. #24
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    could always block it off and T off the other ones? make sure they are clear as well

  26. #25
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    Quote Originally Posted by s3dave View Post
    could always block it off and T off the other ones? make sure they are clear as well
    now there's an idea.... i'm actually waiting for my catch can to arrive, so having the inlet manifold out the way will make it much easier.I'll be blocking off the big nipple underneath as part of the catch can install correct... ? So rather than blocking off I could run a 8mm to 4mm hose adapter to my DV and block the snapped part up?

  27. #26
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    yes, ideal...

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    Quote Originally Posted by s3dave View Post
    yes, ideal...
    Wooohooo :-) easy fix... thanks a lot Dave!And thank you Stacey for the offer of the 5mm nipple :-)
    Last edited by russwuss; 13th December 2013 at 15:44.
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    And its a good time to clean the inlet too, tut tut tut
    Badger 5 tuned 340 bhp / 350 lbft sleeper

  30. #29
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    Quote Originally Posted by slowcoach3 View Post
    And its a good time to clean the inlet too, tut tut tut
    Two cans of carb cleaner on the way as we speak

  31. #30
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    well that's sorted... however now the breather hose decided to snap in half when removing! arghhh!

 

 

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