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SOHC240
07-24-2002, 01:01 AM
Where is the best place to hook up the sending end (the end opposite the actual guage) of the tube that comes with a mechanical boost guage?

Thank you,
Marshall

uiuc240
07-24-2002, 01:38 AM
Tee off from the same vacuum fitting on the throttle body that you use for the FPR (the small one on the top left). works great.

Eric

**DONOTDELETE**
07-24-2002, 10:41 AM
Actually I couldn't get a 0 reading at idle off that line. I used the one on the bottom, reads 0 at closed throttle.

07-24-2002, 11:09 AM
If you're using a vacuum/boost gauge, then you want to tee into a spot that reads manifold pressure directly (like the FPR vacuum line) so you can accurately read both vacuum and boost.

Asad

SOHC240
07-24-2002, 11:22 AM
So the vacuum line that uiuc240 mentioned should be the right one? By the way it is a boost/vacuum guage.

Thanks
Marshall

07-24-2002, 12:46 PM
Yep, the FPR line reads manifold pressure, whether it's vacuum or boost.

Asad

uiuc240
07-24-2002, 12:52 PM
that's the top left one. and monkey, do you mean a 0 reading at idle?? you don't want that. idle should be about 20 in/Hg (negative boost...heheh). also, my autometer gauge doesn't sit at 0 with the car off. i have to recalibrate it...there's a spring in the back for this. it's ghetto, yes, but it will work.

Eric

Steeles
07-24-2002, 12:55 PM
top left if your looking at it from which angle? like if Im looking at it from straight ahead into the TB I thought it was the far right one... http://forums.freshalloy.com/ubbthreads/images/icons/confused.gif

uiuc240
07-24-2002, 01:22 PM
nope, that one's for the BOV. the bigger nipple of the two is for the BOV. smaller is for the FPR/boost gauge. don't know exactly why, but that's the way it is. a nerd probably knows the techie answer. http://forums.freshalloy.com/ubbthreads/images/icons/wink.gif

Eric

jeremiah
07-24-2002, 01:48 PM
</font><blockquote><font class="small[/img]In reply to:</font><hr />
nope, that one's for the BOV. the bigger nipple of the two is for the BOV. smaller is for the FPR/boost gauge. don't know exactly why,
but that's the way it is. a nerd probably knows the techie answer.

Eric

[/QUOTE]

You sure about that? On my clip the Big one went to the emissions canister. Did your clip have it differently?

uiuc240
07-24-2002, 02:05 PM
the one on the bottom is for the carbon canister. just look at how nasty it gets down there. i didn't get a clip, either...this is from other people's info. something to remember...just because you got a clip doesn't mean that it's "stock". they might have had a bunch of BOV/turbo/intercooler stuff on there that they took out before shipping and replaced with stock stuff. and they don't care if it's right or not. so does yours work well they way you have it hooked up?

Eric

Steeles
07-24-2002, 02:05 PM
the biggest of the three for the canister, the middles sized one for the BOV and the smaller for the FPR/boost guage sound right to everyone? http://forums.freshalloy.com/ubbthreads/images/icons/confused.gif

uiuc240
07-24-2002, 02:14 PM
dude, if it's working, leave it. "don't mess with success". most of us don't have carbon canisters, so we just plug the bottom one.

Eric

Steeles
07-24-2002, 02:31 PM
lol I havent hooked any of them up yet, which is why Im verifying with you guys http://forums.freshalloy.com/ubbthreads/images/icons/grin.gif doing it tomorrow.

uiuc240
07-24-2002, 02:37 PM
oooohhhhh. well then i would recommend doing it like everyone else. small one on the top left for FPR/gauge. big one on top right for BOV. bottom one you can cap off and get rid of all that carbon canister/EVAP crap.

Eric

jeremiah
07-24-2002, 03:10 PM
yeah, mine wasn't stock. but i found it especially wierd that the stock bov has a small sized nipple, and everyone said to hook up the big vacuum line to it. My vacuum lines were like this when i got it:
Both the big top line and the small bottom line went to the canister. (the big line was obviosly factory nissan and was exatly the right length to make it to the canister.)
The small one on top was t'd twice right away, one line ran into the car for the boost gauge on the dash, the other to the fpr. then it continued around to the other side of the engine.
from there it was t'd off to the bov and then to a trust boost control solenoid.
so i dunno.

Steeles
07-24-2002, 03:16 PM
yeah see min has some weird T fittings too it but everything in the engine bay was stock. there looked to be holes in the top of the dash where a guage could have sat but not 100% sure.

Beef
07-24-2002, 03:54 PM
Thought I'd throw my .02 in as well to back up uiuc240.

My set up:

Top left - FPR and T'd for boost gauge.
Top right - BOV
Bottom - Charcoal canister

Steeles
07-24-2002, 04:08 PM
yeah after reading this Im just pulling them all off and going with you guys http://forums.freshalloy.com/ubbthreads/images/icons/smile.gif now heres a curve atcha is there anywhere else I can get the WG actuator t'd from or is the Hot pipe the only/best spot for that?

uiuc240
07-24-2002, 04:19 PM
thanks Beef! about the WG actuator...it needs a good boost reading. hot pipe is the best place for fast actuation and max safety against boost spikes. cold pipe would be the best place to get MAX boost into the throttle body. meaning, it will counter the pressure drop across the intercooler. stock location is in the cold pipe.

look at the little clamp coming out of the IC pipe in this pic (http://albums.photo.epson.com/j/ViewPhoto?u=4020294&amp;a=30160867&amp;p=60621645&amp;f=0)

Eric

Steeles
07-24-2002, 06:32 PM
thanks Eric, so could I use the unused charcoal canister line for the wastegate then to get the "signal" from the TB?

uiuc240
07-24-2002, 07:46 PM
hmmm...not totally sure about that. are you using a different IC? i'd try to tap it in closer than that. closer is better for resistance to spiking.

Eric

Steeles
07-24-2002, 08:07 PM
yeah I've got the Greddy Vspl FMIC and the greddy intake manifold. the hot pipe is the stock one (kinda... its been welded into a single pipe)

uiuc240
07-25-2002, 08:51 AM
i'd just tap a fitting into the hot pipe if i were you. keep that line nice and short for good response.

Eric

Steeles
07-25-2002, 10:28 AM
yeah I gotta look at it tonight and see how we're gonna do that. thanks again man http://forums.freshalloy.com/ubbthreads/images/icons/smile.gif