boost not going over 12psi

[terrano hayden]

Ive just put a boost tap in my 1990 terrano and it wont go over 12 pounds ive herd theres a relief valve that needs to be blocked off is this right?

[The Stranger]

On the top of the inlet manifold, about between 3 and 4 there is a relief valve. I just removed mine and got a plug from Waitemata Hydraulics and plugged off the opening.

[terrano hayden]

its not this one is it?

[The Stranger]

That's the one.

[kiwipete]

Yes, that's the one.

[Cambo]

25mm galv plug from RD1 fits, cost $3.99

[terrano hayden]

Cheers guys looks like a basterd to get undone

[Cambo]

Mine was quite easy to undo just used some big poly grips I also undid the four bolts on the riser part of the manifold and the hose clamps after the turbo, removed that section so I could clean it all up & remove the butterfly in the throttle body. Mine was leaking around the seals as yours appears to be, cleaned it all up and just chucked a bolt through with some sealant. I had already disconnected the vaccuum so removed the actuator as well. Dosent leak anymore & will do until the intercooler goes in

[terrano hayden]

plugged off the valve and put a intercooler on over the weekend and had a play at the river on the way back it was only giving me around 5psi so tonight i had a fiddle with some hoses which didnt do anything the took the intercooler off and had another fiddle still the same took the pipe off the wastegate and it went up to 10psi im thinking my boost taps rooted (just a cheap one) but i would of thought that it would boost way more than 10 with the wastegate not opening

am i missing something or is it just a leak im not picking up on???

[kiwipete]

We need to see some pictures of your plumbing setup to get a better idea of what is going on.
What part of the country are you in?

[terrano hayden]

Im in hastings

il get a picture up when i put the intercooler back in

is it just the relief valve i need to take out or is the something else as well

[Filthy4x4]

Hi mate,

My 2c worth would be take the boost tap off and go for a run on open boost and see if it goes over 10psi.

My experiences with those taps have never been anything but problems.

If your a little rough you can control your boost with a drill bit

Just slide the hose off the turbo side pipe a little so you can revert it back to factory boost by simply sliding the hose back on again

Cheers

Caleb

[Dhunt]

on my terrano td27t i toke the pipe off the wastegate but a bolt in the pipe let free boost welded up the relese valve on intake nw she runs about 20psi max loves it turn diesel pump up a sixth of a turn been running nw for about 8 months no problems yet looking at putting a bigger turbo on mine nw i have seen these motors run 30psi just make sure there no air leaks from turbo 2 the intake of the head

[Cambo]

free boosting is a really good way to ruin a turbo really quickly, if you use your terrano as a daily driver then not advisable to free boost, unless you have spare turbos and are really good at changing them on the side of the road!
just my thoughts

[terrano hayden]

Intercoolers back on and its running 15psi which is ok i supose still but it still slow ( just got my kingswood on the road so everything else is slow)

might have a play with the fuel this weekend then try and get a bigger turbo and run 25 - 30psi

what turbos are straight bolt on with little to no modification that can handle that sort of boost? or will i have to do a sh*t load of work to fit one