boost gage hooked up ok!?

[boker240]

i got my boost gage hooked up to a ported vac. source so when it idles its at 0 and when i drive it it sees vac and then it shows on the gage and of corse when i boost it goes into showing boost . does anyone else run their's this way????

[Jookmasta]

boost gauge might be defective? what brand is it? what vac source do u have going to it?

[boker240]

boost gauge might be defective? what brand is it? what vac source do u have going to it?

na, its good im just wondering if anyone else runs theirs like this, ported vac. source only sees vac. when the throttle is hit.

[Florida240sx]

Why we are sayign it's dective. it should have 20 vacuum at idle then whenever acceleratign at all it should at least be at 0. then if soem throttle applied then positive boost pressure.

[Florida240sx]

Got a pic of where it's hooked up?

[scheffler]

Ok well I dont think that anyone runs there gauge this way, beacuse when you idle your vac should be between 20 and 24 inHg (inches of mercury). If you have it set up so that you read 0 inHg at idle it will be harder tell if you have a vac leak and what your vac is. It is very benifitial to know what your vac is at idle to make sure that things are running correctly.

[boker240]

i have it hooked up to a ported vac source, i have gotten rid of all emmisions **** and plugged off all but 2 vac. sources on the mani, one in the back and the one on the side in the back and its next to the brake booster vac, source. ported vac. source only sees vac. when the throttle is hit. have u guys not heard of this????

[WDRacing]

It's not that we don't get it, it's that we don't know why you'd do it?

It has NO function. If you can't see vacuum then you'll never know if you start developing a problem. They make gauges that don't show vacuum, but I don't see why you'd use that either. If the gauge is designed to read vacuum, then you should have it hooked to a signal that show vacuum.

By ported, what do you mean? Exactly...

If the line comes off the intake mani, it should read vacuum.

WD

[boker240]

ported vac. source only see vac at thottle hit , soif im idling and i tap throttle it shoots to -15 and then goes back to 0 when i let off. its where it is supposed to b when im driving ,if im crusing 45 its at like -15,if i hit it it starts goin up to 0 like it should and then as i hit boost it goes into boost , right up to 10 psi like it should.i had that same source hooked up to my tial bov and the car did this up and down idle **** and at idle it would open and close the bov with this up and down idle,thats why i changed it .the bov is know on a vac. source that sees vac. it all the time like th fpr vac. source.i also treid to use the brake vac.line for the bov and it did the same up /down **** idle.idk man.btw my bov is on the cold side ic pipe a foot away from throttle plate.

[scheffler]

I dont understand why you would want your gauge like that. You won't know if you have a issue because when you hit the throtle you get vac but it wont tell you if there is a problem in your vac system. If you have it on a vac source you will be able to see if you have a problem with your vac system, because you can see what the vac is without hiting the throtle and disrupting the vacume that had been created. I am not saying that you have a problem now other than this setup IMO.

Vac gauge is a helpfull tool for trouble shooting problems with you motor.

[boker240]

well, when i had it on non ported vac. source on the last 2 setups ,the vac only went to -11 at the most ,ive had a thread on this bfore and some peeps are at -18, some at -15, and some at like -12-13.idk also i was having as said before^^^^ that ihad a idle issue and bov on idle kept opening and closing and idle was up/down/up/down then i changed the bov to the vac. source that the gage was on and swapped them out ,the car ran right but then when i looked at the gage it was doin this know.idk it seems to run fine and when i get total vac. it now is at -15-16 at the most.???

[scheffler]

well I dont know why you are getting this up, down, up, down thing you should post up a pic of the ports you are using for you vac source. Your vac at idle shoud be about -20 inHg mine goes between -20 and -24, now i know that all motors are diferent but -15 seems a little high to me.

you might want to try to block of this funky little port that you have and use a diffrent one or tee off of the other port you are using and see what you get on you vac.

[Brandon93240]

Ur bov was set too loose most likely for it to open and close with little vacuum flucuation. Was your bov recirc'd? If not that would explain the ****ty idle. As for the rest, I'm not even going to get into all of it. If you want the gauge to read and function correctly install it the way the instructions say.

[boker240]

u cant rec. a tial bov, its atmospheric.and i got the thing posted on the thread that biggamehitts got on the world of holset turbochargers. go look!!

[boker240]

ok,ok,damnit, i changed the thing, i had to just hook a vac. source that i had teed off of and took the tee off ,hooked fpr straight to the source and hooked the gage to another that makes it read- 20 on idle, it even hits like- 22. got it fixed.

[Brandon93240]

Sorry didn't see that u said you had a tial. Glad to see you got your vacuum source correct. Also is your tune setup for a recirc'd bov? If not and you want to keep the bov recirc'd without retuning or getting an afc just run blowthru. The car should ilde alot smoother and decel should be possible without stalling.

[boker240]

no, it runs fine , a little rich though, not so much that i blow smoke but ya. ima get a dyno tune on the afc soon ,before the 5 speed swap and also got to get the walbro ,i know i shouldve allready had that . hehe