matt077

hi,

can some one help me out, i fitted a boost gauge to my rs turbo but when i put the gauge on, the needle drops to -20/-25 and when i rev the car, the needle goes back to 0

i have took a feed from my dub vale, is this right??

ta

pau1rs

thats right

boost guage will only show boost pressure when there is load on the engine, ie driving and will show negative vacum on idle..

well thats right i hope....

gus

iTrader: (1)

i not sure if makes a difference but i have always taken mine from the plenum

matt077

i thought that the needle should sit at 0 and go up the clock when i rev the car?

atm the needle drop to -20/-25 psi (bottom of the clock) and when i rev the car, it goes back to 0 psi

SelbyRST

iTrader: (2)

On idle mine sits around -15 which is correct i think, and when revving in neutral its goes up and down.. But not above 0 because its no geting driven!

matt077

when i had a 2L turbo tomcat, the needle sat at 0 when it was not being rev and went up the clock when you rev or drove the car,

is this not the same on the escort?

Chris69

the car will run a vacuum when idling or not on load- mine sits at -25/20 increasing to 0 and into positive pressure when the turbo boosts

matt077

my one will not go into +psi tho

i will try and take a few pic's it may help

i have took a fed from my dub vale, is that right or is there other way i can fit it?????

SelbyRST

iTrader: (2)

Wont go into + even when driving?

I tee'd mine into a pipe coming off the right hand side of inlet manifold

matt077

well i rev the car and went from -psi to 0psi, rev it up to about 6,500rpm

i have not tryed driving it with it on, i got a little "pee'ed" off and took it off again.lol

Red_bull

looks like it's quite normal, i thought you should get a little boost when you rev is that high, but just go out on the road.

The negative on idle is normal you're car should go on the streets in till 0,5 bar boost +, whenn it's standart

B1G_RST

iTrader: (1)

it wont go up untill you drive it mate,mies sits at -25 then 0 on revving then goes into + when hitting boost,

take it off the top of the inlet tho mate,less hose= less pipe to vaccum

Billy_RS

iTrader: (5)

Take the feed from the plenum/inlet manifold.

turbo

As above mine sits on -15 on idle, then starts to move as it comes on boost.

Marc LJX

iTrader: (2)

You took the feed from the dump valve? So you will only see pressure when the dump valve vents?

As above, take the feed from the plenum. (T into one of the little thin pipes that comes off the top of the plenum)

IIRC mine is T'd into the boost pipe that goes to the ECU, behind the heater box so you cant see it...

TOMO

which in turn could falsify the reading to the fuel computer and casue a fuel issue?

Marc LJX

iTrader: (2)

Just the same as taking it from the plenum?
Been like that for over 10 years, never had a problem

Red_bull

There's no air escaping towards the gauge, so no drop in pressure. So in my opinion no falsify reading of any computer