nebulight

Well, I've recently installed my turbo, but I'm really not getting into boost at all, but when I get on it in lower rpms before the turbo really spools, when I let off, I hear compressor surge! I got a tial 50mm bov, but right now I have the Vac line Teed off between my wastegate and BOV. The hose is pretty long, if you look at the pic it goes from the drivers side down to the wastegate and then up to the BOV:





I will be switching it and using my barb fitting on the bottom of the intake manifold that is now being used by my breather box when I get a catch can so it will be a shorter line, but just wanted to be sure that with a shorter line it will help out with the surge. I'm assuming it would, but wanted to double check to make sure.

I do not know what size spring is in the BOV since I bought it without a box. Would a different spring help out with the surge? I would assume since it's a push down BOV and the car has a map sensor I could use a light spring so that it will open quicker with a vacuum source. Any input?

PS, yes I have a filter on the turbo


Modified by nebulight at 11:56 PM 10/31/2006

B18C1CYA

I would run 2 seperate vacum ports from the manifold to each , probly solve your problem

nebulight

But my concern is more if anyone else has had issues with the Tial BOV. I got it because it's supposed to be one of the best, but now that I have surge, I was rethinking. But that line is pretty long, but I don't know if that would have anything to do with it.

Wideopentuning

Make sure your vacuum line to the blow off valve is proper diameter and not colapsing at all under high vacuum. The Tial needs to have a signal from its own vacuum port on the manifold or vacuum manifold to work well. It should blow off clean and crisp even under 5 psi of boost with the standard -9 psi spring.

nebulight

I thought it was -11 standard. I really need to find out what spring I have.

gsrious

just redo your lines(each to its onw vac source[mani]), and then i think you should be good.

the fact that you have the line teeing right at the watse gate make me werry(sp?)

shortyz21

make sure the hose is big enough.

i had the same problem because i used a smaller hose size. tee off your brake booster line, its nice and big.

also your WG line should be from the compressor housing. i said should. doesnt have to be though.

nebulight

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shortyz21 &raquo;</TD></TR><TR><TD CLASS="quote">make sure the hose is big enough.

i had the same problem because i used a smaller hose size. tee off your brake booster line, its nice and big.

also your WG line should be from the compressor housing. i said should. doesnt have to be though.</TD></TR></TABLE>

I don't like running from the compressor housing, I know it's the shortest distance, but if you are running off the wastegate spring for boost, the boost can fall and rise depending on weather, conditions of pressure in the atmosphere, ect. If you run off your intake manifold, then you know it's always going to open at the same spot.

CRXdan

Runnign off the compressor will cause the wg to crack open under light throttle conditions. Run it off the intake manifold assuming your wg diagpram holds good vacuum, otheriwse, your idle will be screwed, in that case you have no chioce except to run it off the compressor. I had this problem which sucks cuz i really liked it off the intake manifold. boost went up 1-2 psi though.

vaporboy12

hows the manifold working out hehe i miss that thing

nebulight

It's working great man, thanks. I sold the DP I got from you and bought a brand new one from Evans during their garage sale. Have any pics of your new topmount?

vaporboy12

nope i already sold that haha

HNLV

t it from the intake manifold

yee SERIOUS

iTrader: (1)

i had the bov and wg both on the same vac line. it responded, but a bit slow. when i changed to a GE vac manifold and gave them each a vac source, everything responded a lot faster and it felt 10x better.

i can post a pic of my vac setup if you need it.

abnaasefmb

I had both the wastegate and the bov running from the manifold (separate lines) and my boost was dropping off a couple pounds after 6000 rpm. I switched the wastegate source to in front of the throttle body and the boost pressure stabilized. I think the air in the manifold was too turbulent in the upper rpm band to hold solid. This is just my experience.

nebulight

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by abnaasefmb &raquo;</TD></TR><TR><TD CLASS="quote">I had both the wastegate and the bov running from the manifold (separate lines) and my boost was dropping off a couple pounds after 6000 rpm. I switched the wastegate source to in front of the throttle body and the boost pressure stabilized. I think the air in the manifold was too turbulent in the upper rpm band to hold solid. This is just my experience. </TD></TR></TABLE>

hmmm, what intake manifold did you have (not that it would have a big impact)?

JDMCRX

iTrader: (2)

I found the best way for the tials to work is to A make sure ur hole were goes into the intercooler piping is ported out. B use its own vacum source from the intake manifold. I used to get the comp serge when i was teeing stuff. Now i drilled a hole in the intake and tapped it 1/4NPT 27 and when i let of it opens up hard.

Good luck

nebulight

yea, the hole on the IC pipe is as big as the flange, and I'll be getting all my lines straightened out and shorter when my Endyn Breather comes.

tony1

Is the BOV T'd into the wg and the compressor housing?

nebulight

There is a fitting on the back of my intake manifold with a line connected to it, it then feeds up to the wastegate where it's T-ed off and then goes to the BOV.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Is the BOV T'd into the wg and the compressor housing?</TD></TR></TABLE>

lol, I'm not that stupid

yee SERIOUS

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nebulight &raquo;</TD></TR><TR><TD CLASS="quote">
lol, I'm not that stupid </TD></TR></TABLE>

when i first had my turbo setup put together, i T'd everything off the FPR. LMAO. boost gauge + fmu + wg + bov.