Boost Gauge and 4AGZE

[beeker]

I've got an Autometer 20psi boost gauge in the 4AGZE. Problem is, at no throttle it reads approx -4psi, and at full throttle approx +4psi. The previous spitfire did approx the same.

Have i hooked it up wrong, or is this normal for a 4AGZE ?

thx in advance.

[evil_si]

you have no doubt connected it wrong.

were have yoy t'd it into?
there is a little fitting out the top of the inlet manifold, i can remeber what it feeds but its the one you want to use i will try and find a link with a picture

[beeker]

This is where its currently hooked up.

[Rick]

dont you tee into the vacuum line that goes from the intake manifold to the brown vacuum valve which operates the fuel pressre regulator?

[pidge]

It looks like you've hooked it up to the vaccum line that goies to the FPR, not the line that comes from the inlet manifold. I think the one you want to tap into is the one running in front off the otehr two vaccum lines in the picture, going by a comparision with my "before" picture of a AE101 VSV bypass:




(I'd rotate the picture so it corresponds to your's, but I can't be arsed.)

[beeker]

It looks like you've hooked it up to the vaccum line that goies to the FPR, not the line that comes from the inlet manifold. I think the one you want to tap into is the one running in front off the otehr two vaccum lines in the picture, going by a comparision with my "before" picture of a AE101 VSV bypass:




(I'd rotate the picture so it corresponds to your's, but I can't be arsed.)

Any chance of a pic of where "the line that comes from the inlet manifold" hits the manifold ?

From looking at my car, the other two options either go to the ~wategate or the supercharger.

[bluemaumau]

old post, just wondering if someone can provide the correct answer?

which line to "t"?

cheers

[sk1dlet]

T into the line that comes from the inlet manifold

[bluemaumau]

the big fat one in that pic? (with the pink writing on it)

[sk1dlet]

no the one that comes from the inlet manifold bolted to the block, not the ones from throttle body or anywhere else

[bluemaumau]

yea i get what a inlet is dude.

where does this line run to. sorry its raining, and me engines in the barn.

[beeker]

My problem was finally resolved with decent OEM vacum tubing. The crap stuff i got from supercheap caused the whole problem !!

[bluemaumau]

jeez do you need good piping to?!

is OEM like a standard of piping?

i was just gonna go to hammer hardwear.

so you did have it in the correct place?

[bluemaumau]

surely the piping dosent matter, esp if you clamp each end?

but yea was your "T" in the right place?

[2LTR Rona]

It will matter especially if its low quality that allows the pressurized air to escape while traveling through the line, this will result in a lower and false reading on the gauge, bit like a hose with pins holes in it

[bluemaumau]

ok so were does everyone go to get good boost gauge piping???

[beeker]

ok so were does everyone go to get good boost gauge piping???

I got some OEM Toyota Vacum piping. Visit a wrecker or in my case i ordered some from toyota as i had limited time.

[aesc]

ok so were does everyone go to get good boost gauge piping???

Repco has Gates vac line, pretty decent stuff. I haven't had any problems with Super Cheap vac line so far either

[bluemaumau]

ok cheers guys.

jeez i thort a pipe was a pipe.

[crnkin]

out of interst, i have this shitey vac tube, and in every guage ive had, (2) the needle always shakes at full bost, varying by about 2 psi, like a really rapid shake, so i can never tell if its actually 5psi or 7psi (so i say 6).

Would a better hose in theory fix this? anyone had the same problem?