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01-05-2002, 04:20 PM | #1 |
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Is this ok place to tap for boost pressure reading
Found this picture from another thread:
Can you tell me if this tap will work especially if you speak from experience... I need to tap another spot for boost pressure reading and I'd like to avoid trial & error.
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01-05-2002, 04:47 PM | #2 |
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There was a long discussion on this a couple of months back and this place was determined to be the best place. For you doubters do a search and check out the thread. This was proven with actual road tests.
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01-05-2002, 04:48 PM | #3 |
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i tapped mine to the hose that is connected to the stock bov, i found it on this site...http://www.f1carsets.com/wrx/docs/gauges.html
have fun! |
01-05-2002, 04:58 PM | #4 |
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Yeah I know this is a well-covered territory but
the tap in this picture here was what was discussed, which is where I have a tap now: What about the tap shown in the first picture? Equivalent? |
01-05-2002, 05:42 PM | #5 |
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Those are both tapping into the manifold. The first pic is the way I did it and is the easiest way to do it. The other pic is tapping into the same place with about 5 times the amount of work.
I dont know why you would read from the BOV for manifold pressure (like the stock setup), but I'd rather read directly from the manifold. And you need no tools to install it there. Mines all slip fittings, no clamps. Boost gauge can be removed completely without 1 tool in about 5 minutes. ~v6 edit: There is no need to modify ANYTHING if you install it like in the first pic. Even tho the pic shows the hose being cut and the adapter put in between the splice. I just pull off the stock hose, attach the stock hose to one end of my T fitting, got a 2" piece of windshield washer line and went from the other side of the T to the manifold. I dont reccommend cutting any factory lines that you dont need to. You'll probably appreciate it later. |
01-05-2002, 06:38 PM | #6 |
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was going to ask the same question evently,i tapped the first place showen,but my guage reads 15hg instead of 20hg,is this right.
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01-05-2002, 07:00 PM | #7 |
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I tapped right off of the manifold that is shown in the first pic. The only thing i did differently was i ran the hose aroung the other way and concealed the hose. The first pic shown looks very unprofessional. I prefer keeping the engine compartment uncluttered, therefore, as stock as possible.
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01-05-2002, 08:30 PM | #8 |
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Did you guys see where the BOV line originates from? If not, its right from the intake manifold. You just have to follow the hose closely, its easy to loose sight of it under there. Give it a try.
Dan |
01-05-2002, 08:50 PM | #9 | |
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Quote:
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01-05-2002, 10:23 PM | #10 |
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Our WRX's MAP sensor reads boost at the throttle body and one would presume that FHI engineers had the luxury of putting it anywhere they wanted. It would be nice if everyone installed their boost line connection at the same place since it would make people's boost reports more useful.
Anyway, here are some other discussions: http://www.i-club.com/forums/showthr...threadid=40218 http://www.i-club.com/forums/showthr...threadid=96975 |
01-06-2002, 12:02 PM | #11 |
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I connected my "T" to the hose that is connected to the stock bov too. I followed the OEM boost gauge instruction. I think both spots are ok. I do agree with Jon [in CT] that we all should have a standardize spot, so that we can get more consistent reading for all.
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01-06-2002, 03:07 PM | #12 |
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I attached my SBC-iD to the stock bypass valve, could this affect my readings since the SBC-iD is more than a gauge? Should I move it to the manifold?
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01-06-2002, 03:11 PM | #13 |
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The Blitz instructions recommends tapping after the throttle...
You'll probably see more transient boost spikes at the bypass valve line when the throttle shuts |
01-06-2002, 04:06 PM | #14 |
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Sorry to ask, but what do you mean, after the throttle? My instructions were in Japanese so I made the best out of what I had So I should move it? But to where? thanks!
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01-06-2002, 05:38 PM | #15 |
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No worries, bdowell. The BOV hose taps the mainfold past (i.e. downstream of) the throttle, as does the FPR hose. IMHO, any pressure differences between these various manifold tap points will be very minor, if any, as long as they are downstream of the throttle. These arguments seem to repeat every couple of months on this forum. The only location that is 100% wrong is tapping upstream of the throttle, such as off the IC.
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01-06-2002, 06:36 PM | #16 |
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Rocky, I think the BOV is definitely upstream of the throttle body.
Isn't the valve right off the intercooler & not the plenum? Anyway, when I had my gauge tapped off the BOV I saw huge spikes (around 18psi) when accelerating hard & upshifting... those spikes disappeared when I moved the tap to the FPR hose. Bdowell, I have an .pdf copy of the blitz instructions in english which I can send ya. |
01-06-2002, 08:56 PM | #17 | |
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The WRX's bypass valve's vacuum hose is definitely connected downstream from throttle body. Let me quote an Imprezer (AKA Imprezident) post from a thread I cited earlier:
Quote:
I've been gone 5 weeks. I missed this "banter." |
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01-06-2002, 09:28 PM | #18 |
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I know this has been beat to death, sorry
Jon: isn't the stock bypass valve that bronze colored guy with the letter "Z" printed on it (shown in the first picture above) and the vacuum line is coming off it to the right. So isn't the bypass valve connected to the intercooler, therefore it's upstream of the Tb??? The boost spikes are therefore real transient spikes that the manifold doesn't see (?) Anyway, I haven't heard of anybody having idle problems going the other way ... and as you pointed out in the older thread the OEM gauge instructions seems to contradict itself on this. Last edited by Fubaru; 01-06-2002 at 09:34 PM. |
01-06-2002, 10:53 PM | #19 |
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Jon, thanks for the very interesting words from Imprezer. Please don't stay away for so long next time. I'm still not certain of cause vs. effect. Is he saying that the gauge readings using the idle control hose are incorrect (i.e. the gauge reads phantom spikes induced by the idle control system in its hose), or that tapping that hose causes the idle control system to induce real spikes that can possibly damage the engine? He mentions boost controller issues, but no one here has talked about using that hose to do anything other than read pressure. I don't see how a couple of extra feet of hose is going to soak up much of a spike though.
IIRC, most of the previous arguments I've followed have been 'FPR' vs 'BOV'. Regarding the BOV, it is bolted to the IC, and when it opens, it vents the IC pressurized air upstream from the throttle, back into the pre-turbo air intake pipe. However, the hose that provides the pressure/vacuum to open or close the BOV, is connected to the intake manifold, downstream of the throttle. That's the hose that people tap for their boost gauge. It's the little hose coming off the side of the BOC crown. If you follow it, you will find that it attaches to the intake manifold. |
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