i just got off the phone w/ the guy thats going to be tuning my car and he said not to tap into my brake booster for my vacuum manifold. i know like 99% of ppl on here and eveyr other honda forum i go to .. all tap into that damn brake booster line, so this makes me skeptikal about this guy tuning my car. i may have to go to jeff evans now.

but are there any other spots i can hook up my vacuum mani? or should i just tap into the brake booster even tho my tuner says not too

 

It really depends on the check valve your using. If your car is an 96-00 then the check valve is inside the line and i wouldnt run a vac manifold in it. If its 92-95 i would run it before the check valve. You dont want pressure going into the brake booster and possibly cause problems.

What intake manifold are you using? I never use vac manifolds, theres really no reason for them other then bling.

 

i have a 96-00 civic.. i dunno ppl tell me to get them b/c they free up vac lines and what not .. so i bought one figuring it would be easier

i have my stock y8 manifold the car is a 97 civic ex btw. i'll only be hooking up my boost gauge, wastegate, and bov

 

Honestly if its only those 3 things your going to be running the manifold for i would sell it. Do you have cruise control? If no then i would T the boost controller and BOV off the source on the back of the intake manifold. As for your wastegate your turbo has a boost source that you could tap off of.

 

yea i prolly will sell it.

i have cruise control.. and i dont have a port on my turbo, and i dont want to tap one, where else can i t-off on my intake mani?

 

What turbo do you have? Majority (if not all) have a port for a 1/8th fitting for a vac source because it is not always best to run the WG off intake vacuum. A vac port is a vac port so you could actually hook it to anything. If you want T it off your BOV and T your boost gauge off your FPR.

 

fpr is that little gold circle thing on the left of my fuel rail??

and i have a garret t3 .42/.48 theres no port. another reason i woundlt want to hook it up right after the turbo is b/c i'll be loosin psi, right after my turbo the wastegate will open at 7psi, but by the time it goes thru my intercooler and reaches my intake mani i'm gunna have a pressure drop, i dont want that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pjr710 &raquo;</TD></TR><TR><TD CLASS="quote">fpr is that little gold circle thing on the left of my fuel rail??</TD></TR></TABLE>

No that is just your fuel line. FPR is on the right side of the rail and has a vac source to it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pjr710 &raquo;</TD></TR><TR><TD CLASS="quote">and i have a garret t3 .42/.48 theres no port. another reason i woundlt want to hook it up right after the turbo is b/c i'll be loosin psi, right after my turbo the wastegate will open at 7psi, but by the time it goes thru my intercooler and reaches my intake mani i'm gunna have a pressure drop, i dont want that</TD></TR></TABLE>

That makes no sense. Only thing you would put before a turbo is an EGT gauge because thats the only thing that could withstand that heat.

 

yea .. the fpr is on the left when looking from the front of teh car on 96-00 i believe. 92-95 is on the right.

and i never said anything before the turbo.. i said right after the turbo, what i meant was hookin it to the compressor housing

 

My mistake you are correct about the FPR but the thing about loosing psi still makes no sense.

 

yea it does.. as the air travels thru the intercooler from the hot to cold side its gunna lose some pressure, so if my wastegate was hooked up to my turbo housing, it would be opening at 7psi, then by the time it got thru the intercooler it would be at say 6psi, but if i had the wastegate on my intake vac line, it would be opening at 7psi on the cool side, so then my turbo might be pumping out 8 psi

thinking about it now i think this would only happen if i didn't use a boost controller, if i used a boost controller it wouldnt matter b/c i would be reading the psi from the intake mani so if i wanted like 9 psi, my turbo might be pushin out 10psi .. but it wouldnt matter

 

Just by your last post is obvious you dont know how pressure works. Before you reach X amount of pressure you have to fill up everything in the area before you could read a certain amount of pressure. So before your turbo/WG/IC/IM see 7psi of pressure everything gets filled up with 1-6psi first. Once it reaches 7 the wastegate will open up to maintain that certain pressure. Theres none of this "i lost X amount of pressure because of my intercooler and pipe travel" Only way you loose pressure is by leaks in your plumbing. Now you do loose (**** cant remember the word, i want to say volume but i think im wrong) of air based on the size of the turbo. Smaller turbos will pump less volume then a bigger turbo making less power at same PSI. PSI doesnt equal HP PSI is just a reading.

 

well what about hte air that comes directly from the turbo, couldnt that be reading a higher pressure than it acutallly is since the turbine wheel is spinning so fastly, meaning the air immediatly after the turbo may have more pressure than the air further from the turbo

 

Did you not read what i wrote? You have to fill up an area in order for you to read pressure. Doesnt matter how fast the turbine spins. Its like filling up your tires, you are not going to have more pressure at the stem until the whole area is filled, even then it is equal pressure.

 

how would i tap my housing? just drill it and screw in a threaded nozzle?

 

If you want or see if you could trade the housings. I dont know what housing you have (as ever housing is different). But yes drilling and tapping is one way of doing this.

 

what would happen if i just tapped the piping directly after the housing? would that work the same

edit: just googled tapped turbo housing and found this http://www.frsport.com/Turbo-Q....html looks like a good idea to me

 

Since your doing small amounts of pressure i dont see anything wrong with that link.

 

i'm gunna wait to see how my piping fits up w/ my new coupler i orderd ... and if all is well i'm gunna order it up

 

I was in a similar situation, no tap on my garret t3/t4 turbo for a boost source. I went my local shop, they just welded and tapped a bung in my charge pipe in my desired location, cost 20 bucks. I placed it post intercooler so my w/g reads what the mani is gettin. this way if you decide to up the psi, nothing needs to be changed.

 

This is how i routed my vac manifold. After a little over 2 years, i've had no problems with it.

 

i think i'm guna keep the vac mani off for now.. but i emailed jeff evans, a real good tuner, and he says to tap the turbo b/c the wastegate should never see vacuum only pressure should push it out. so i would like to tap it there, hook up a boost controller, then just have it run like that for now .. and t off my other vacuum lines