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Mat
Guest
Well, after taking bits apart and re-fitting to make sure I have nice tight seals, I eventually found the problem! The vacuum pipe that goes to the nipple (he he) of the DV has been rubbing on a metal pipe at the back (think it's for AC). This has generated a small hole.
Luckily, I had some spare 4mm hosing and put that on, however, only goin to around 16 or 17psi, and wont touch 20-21 unless under load (low revs, slight hill). Usually it'd be boosting to 25-26psi!
Think I may cut off the bad part of the old hose, and put that back on (after checking for possible leaks on new one
Luckily, I had some spare 4mm hosing and put that on, however, only goin to around 16 or 17psi, and wont touch 20-21 unless under load (low revs, slight hill). Usually it'd be boosting to 25-26psi!
Think I may cut off the bad part of the old hose, and put that back on (after checking for possible leaks on new one
stop fukking around matt and get some new 4mm vac piping for about 4 quid. then you know its good 
Mat
Guest
Think it's about sorted now. Took advice from Ian, and tried old pipe again, with crap bit cut off.
Every gear boosts to 20 almost straight away, even 21.
Will see how things go on way to work as it's an uphill road on the way where i can boost to 25psi (if i boot it)..
May also change all vacuum hoses when I service it, maybe shrink from 4mm to 3mm
Every gear boosts to 20 almost straight away, even 21.
Will see how things go on way to work as it's an uphill road on the way where i can boost to 25psi (if i boot it)..
May also change all vacuum hoses when I service it, maybe shrink from 4mm to 3mm
Mat
Guest
stop fukking around matt and get some new 4mm vac piping for about 4 quid. then you know its good
that's what i replaced the old one with, some new 4mm.
As said above, will probably replace ALL hosing. Ian says 3mm is ok. He confirmed my question about it being more condensed may mean more boost. Maybe that will solve the issue.
Good to hear mate...
If you have a Forge TIP it's worth cutting down the part where the DV sits in, as it will sit too high and rub against that pipe if you run it in its stock position and not reversed.
If you have a Forge TIP it's worth cutting down the part where the DV sits in, as it will sit too high and rub against that pipe if you run it in its stock position and not reversed.
Mat
Guest
there's a bit of fabric or something around the pipe. A bit has worn away where its been rubbing. Will just wrap something around there again
sorry to hi-jack but when i brought my car it boosted 15psi with a unkown map? now maf went so i ordered a new one and fitted it and it hit 15psi then dropped to around 8ish psi now i vag comd it and maf was crap so 2 months on (now) i have put new maf on genuine part and it hits 15 psi and drops down to 8 - 10 psi but i know if i unplug maf it will get 15psi? what would you recomend to check/buy new N75 ?
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