cals400ex

iTrader: (27)

i think some of the guages tap into the stock map sensor to read boost. is this an ideal place? i didn't know if that is where you were supposed to measure boost or not??

stevieturbo

The only place is the intake manifold.

conan

iTrader: (5)

I have all my vacume equipment pulling from the brake booster line.

ls1290

iTrader: (20)

Totally agree. I have my boost gauged Y'ed into the location where my MAP sensor is since I have a SD tune.

cals400ex

iTrader: (27)

i guess i didn't know if there would be a difference at the front or the back of the intake. thanks for the help.

stangbangin69

iTrader: (26)

i was told, by my tuner, that the reading should be taken from the rear of the manifold. if it is taken from the front then the engine hasn't had the chance to "gobble up" the boost. the reading won't be a "true" reading of psi. i trust him.
brake booster hose would be an ideal place.

ChevyChad

iTrader: (50)

I dont think the brake booster is a good place at all. Infact, I think its a bad place, but thats just my opinion i suppose.. Anywhere on the manifold should be the same.

1320

iTrader: (6)

I run small vacuum block. I port things off it, like the brake booster line, the lines for things like boost controllers, bov's, alky controllers etc....the last thing in the block is the boost gauge. If you get a leak anywhere in front of the boost gauge, its easier to see on the gauge. Sometimes a small change in the vacuum reading or boost responce or peak boost can indicate a possible leak somewhere. The more things you run, the more avaiable volum you need from the feed line and the block. The more volume you have the more sensitive the gauge the will be. The numbers dont change justthe way it responds to changes.

stevieturbo

What a load of *****.

Its quite common on many cars for there to be a takeoff mounted on the TB itself. Location on intake manifold itself is pretty irrelevant, as loing as its thereabouts.

Nothing particularly wrong with teeing into the booster line either though, it is after all attached to the intake manifold.

stangbangin69

iTrader: (26)

okay then...
why is it that when i hook my boost gauge up, at the front of my intake, it reads 11psi. then when i move it back to my brake boost line "t" it shows 6.5psi? someone care to chime in with an explanation on this one?

stevieturbo

You must have a leak somewhere on the brake booster line.

There can be no other possible explanation.

stangbangin69

iTrader: (26)

i'll have to investigate the leak.
bottom line is that we both agree that the brake booster hose is sufficient enough for an accurate boost reading. just do it!

ChevyChad

iTrader: (50)

I wouldnt want to take any vacuum away from, or even create potential for leaks there on a part of your car as crucial as your brakes. Just my opinion, but I'd tap into any other source on the manifold other than the brake booster. Your car tho man, if you feel comfortable with it, have at it.

1320

iTrader: (6)

I would guess a leak in the line somewhere between the intake and the t that your using to hook the gauge too.