two simple SR vacuum questions.

[om3ga]

I may sound like an idiot on this but it may be this simple..

I need to hook up the Wastegate vacuum line, Do i just run it to any nipple on the Intake manifold?

I also need to hook up the Bov, Do i run its vacuum line to any nipple on the Intake manifold?

Someone was saying run one to the Wastegate and run a T from that to the bov...? I just dont understand what to do exactly

[duffman1278]

Just run the wastegate's from the hot pipe if you can.

The BOV should have it's own coming from the TB. iirc it's the bottom nipple.

[zoomswimmer]

I actually think it's one of the top nipples.

[s14unimog]

The BOV is a vacuum source; which can be found underneath the TB. The actuator needs a BOOST SOURCE. I don't understand why people get so confused with this. A small rubber hose is NOT called "vacuum hose" and I know, typically, it is used for vacuum but that is not always the case. That someone you are referring to is a dumbass, since they need two completely different sources, that would never make sense. The boost source for the actuator should come from the pressure system (hot pipe, cold pipe, tap the turbo, etc...)

This is also a very elementary question, I believe you could have easily found this with a little effort...

[boosted_kouki]

http://i28.tinypic.com/144a0km.jpg

[om3ga]

Ok cool so i just run the 'boost source' line from the wastegate to the hotpipe? and the Bov can get hooked up to the intake manifold?

That diagram shows a ton of stuff i dont have on the engine haha im putting in a front mount and i dont have those solenoids anymore.

[boosted_kouki]

my car is intake mani to a T to waste gate and bov. no solenoid either

[DataXUnknown]

I just have one from top of TB going to BOV, then my wastegate is connected to the nipple on the stock SMIC coldpipe. The other nipples on my TB are blocked off.

[s14unimog]

my car is intake mani to a T to waste gate and bov. no solenoid either

:wtf: you posted a factory diagram and don't even have it hooked up on your car right?

[om3ga]

LOL im just wondering mainly if the BOV can be just directly connected to the intake manifold

Also can the Wastegate be directly connected to the intake manifold too? I dont want to T them together unless there is some reason why i HAVE to

[boosted_kouki]

:wtf: you posted a factory diagram and don't even have it hooked up on your car right?

TB to T to bov & waste gate...that's how its hooked up in the diagram minus the solenoid...
i don't see why u wrote this statement

[s14unimog]

LOL im just wondering mainly if the BOV can be just directly connected to the intake manifold. Also can the Wastegate be directly connected to the intake manifold too? I dont want to T them together unless there is some reason why i HAVE to

the DON'T share the same source! The should NEVER be tee'd together....EVER! Run the BOV off a vacuum source from the intake manifold by its self; use the larger nipple on the stock manifold. Then provide a pressure source for the actuator.


TB to T to bov & waste gate...that's how its hooked up in the diagram minus the solenoid...
i don't see why u wrote this statement

Are you retarded.... look at the diagram!!!! They DO NOT share the same source! :duh:
The T you see in the diagram goes to the EAI Control Solenoid...trace the hidden lines under the hot pipe.

[g6civcx]

The BOV is a vacuum source; which can be found underneath the TB. The actuator needs a BOOST SOURCE. I don't understand why people get so confused with this. A small rubber hose is NOT called "vacuum hose" and I know, typically, it is used for vacuum but that is not always the case. That someone you are referring to is a dumbass, since they need two completely different sources, that would never make sense.

I commend you for being precise with your "vacuum" line syntax. Bravo.

[boosted_kouki]

the waste gate is connected to the cold side pipe, which will have the same vac as the tb.

either way it works, there is more then 1 exact way that will work.

[s14unimog]

the waste gate is connected to the cold side pipe, which will have the same vac as the tb. Either way it works, there is more then 1 exact way that will work.

^ this is an incorrect statement... the cold pipe does not have the same vac (its not vacuum) as the throttle body (intake manifold)

Its not plumbed correctly, I can promise you that. I'll say it again, the wastegate needs a pressure only source. What's happening is that your actuator is seeing vacuum until pressure reaches your intake manifold. This CAN be done but is NOT correct and can cause boost spikes. You can agree with me or not, but the bottom line is that your car is plumbed incorrectly.

[teamsprock]

S14unimog you are so quick to jump down his throat yet your so wrong. The larger nipple on the bottom of the throttle body is both boost and vacuum. It goes threw so you are getting a source from the plenum. This is perfect for either the BOV, FPR, Wastegate signal. ANything that needs boost and vacuum. I prefer the hot pipe of taping the compressor housing for a cleaner look. You can also T into the brake master cylinder vacuum hose as long as you do it before the check valve. There is some advantage to running your wastegate signal to the intake mani because then you will run slightly more boost as the signal is after the intercooler where you will have some pressure drop. I've seen as much as 1/2 psi higher that way, but then you have a longer line so a slower response and an eye sore. As said above there are many ways to skin a cat, and if you are going to make people feel dumb you better know what your talking about first.

You are correct that the cold pipe and the other nipples on the TB are the wrong place to hook it to as they only have a signal when the TB is open since they are on the piping side. The wastegate can see vacuum without any adverse effects. Talk to the guys at Full Race, they always pull it from the brake master line which is also plenum related. You just don't want pre TB sources.

[s14unimog]

since you've decided to jump in on the fun...I'll respond to each point...


S14unimog you are so quick to jump down his throat yet your so wrong. The larger nipple on the bottom of the throttle body is both boost and vacuum. correct, and I've stated that above It goes threw so you are getting a source from the plenum. This is perfect for either the BOV, FPR, Wastegate signal. ANything that needs boost and vacuum. incorrect, the wastegate does not need vacuum I prefer the hot pipe of taping the compressor housing for a cleaner look.your grammar is a little screwy here, I think you're saying you prefer the hot pipe over tapping the compressor housing; which is fine, it doesn't matter. You can also T into the brake master cylinder vacuum hose as long as you do it before the check valve. true, but for what? the BOV? Fine you can do that There is some advantage to running your wastegate signal to the intake mani because then you will run slightly more boost as the signal is after the intercooler where you will have some pressure drop. I've seen as much as 1/2 psi higher that way, but then you have a longer line so a slower response and an eye sore.Another true statement, that's why Nissan does it off the cold pipe As said above there are many ways to skin a cat, and if you are going to make people feel dumb you better know what your talking about first.
I do, and you've only reiterated points I've covered

You are correct that the cold pipe and the other nipples on the TB are the wrong place to hook it to as they only have a signal when the TB is open since they are on the piping side. The wastegate can see vacuum without any adverse effects. not true, the long distance, and pressure loss from the distance can cause boost spikes Talk to the guys at Full Race, they always pull it from the brake master line which is also plenum related. You just don't want pre TB sources.again for what? The BOV? I've not argued that

So after all of that, you still have not corrected a thing I've said...

[teamsprock]

NO the wastegate has no problem with seeing vacuum as you said it did in an earlier post. Sorry for the messed up grammar, I smashed my thumb and am having a hard time typing. You can use any source with vacuum and boost for the wastegate signal. The kits that many companies sell to T into the brake booster line are specifically made for Teeing into for the wastegate. I was saying I prefer taping the hot pipe so I can use AN fittings and steel braided lines as I run 26+ psi and have had too many problems using silicon or rubber hoses on my wastegate. The wastegate does not need vacuum but you said that will cause problems, it should not. It also helps the wastgate seal better as the vacuum draws it closed, more so on external wastegates.

The other thing is the BOV is also better off seeing both boost and vacuum. This also helps seal it under high boost applications. I'm not trying to argue with you just hate when people tell other people they are dumb when they really are not wrong. The way suggested earlier is fine and is how many people run wastegate signals. Its not how i'd do it either but doesn't mean they are wrong. I'd also never T into another line for something as important as the FPR or wastegate signal. I do agree the longer the hose the slower the response, but not bad enough that you should see any spikes large enough to matter. I'm not saying your wrong just saying there should be no problem with the wastegate seeing vacuum, you just want the lines as short as possible.

If you want to see that wastegate manufacturers recommend using plenum sources look at the Tial web site, I was going to link it but its a PDF and I don't think most people care enough to look.

[SILVIA_KIDs14.5]

s14unimog your still wrong because you can have you wastegate hooked into you bov and you are better off having it on the oppisite side than the hotpipt also bov is a boost source remember that it needs to have pressure inorder to relive it so don't go off on other ppl when your wrong

[teamsprock]

There is nothing wrong with the wastegate signal coming from the hot side, you just usually get a little less boost depending on the pressure drop of your intercooler. I prefer the hotpipe side as its cleaner looking and most importantly has less line. So you also shouldn't tell him he's wrong because in a way your both right. But you can use either side. The wastegate does only have to have a boost source but it will not hurt it to see both and can actually help it seal tighter.

Also the BOV uses vacuum to open, but having both vacuum and boost is what is called for. The boost helps put extra pressure on the top of the BOV to keep it closed, then when it goes to vacuum and that pressure is now in a negative situation it will open the diaphram.

[s14unimog]

NO the wastegate has no problem with seeing vacuum as you said it did in an earlier post. Sorry for the messed up grammar, I smashed my thumb and am having a hard time typing. You can use any source with vacuum and boost for the wastegate signal. The kits that many companies sell to T into the brake booster line are specifically made for Teeing into for the wastegate.due to its proximity, there is less chance of delayed response. Ontop of that, the diameter of the brake boosters vacuum source has less pressure drop I was saying I prefer taping the hot pipe so I can use AN fittings and steel braided lines as I run 26+ psi and have had too many problems using silicon or rubber hoses on my wastegate. The wastegate does not need vacuum but you said that will cause problems, it should not. It also helps the wastgate seal better as the vacuum draws it closed, more so on external wastegates. then why don't you do that? The other thing is the BOV is also better off seeing both boost and vacuum. not only is it better off, its necessary This also helps seal it under high boost applications. I'm not trying to argue with you just hate when people tell other people they are dumb when they really are not wrong. The way suggested earlier is fine and is how many people run wastegate signals. Its not how i'd do it either but doesn't mean they are wrong. No it does, Nissan did this for a very specific reason, why go against millions of dollars of R&D? I'd also never T into another line for something as important as the FPR or wastegate signal.me neither, I will agree with you I do agree the longer the hose the slower the response, but not bad enough that you should see any spikes large enough to matter. I'm not saying your wrong just saying there should be no problem with the wastegate seeing vacuum, you just want the lines as short as possible. I saw boost spikes of up to 3psi over target with my past KA-T setup. If you are running your setup close to its max potential (as most people do with a BPU SR20) then you could cause catastrophic failure from over boosting

You guys are loosing focus of the thread topic. When I called him retarded it was solely b/c he posted a factory diagram and then directly contradicted it. That's retarded



s14unimog your still wrong because you can have you wastegate hooked into you bov and you are better off having it on the oppisite side than the hotpipt also bov is a boost source remember that it needs to have pressure inorder to relive it so don't go off on other ppl when your wrong

I AM NOT WRONG. I simply stated that his setup is incorrect. Who the fuck are you and why are you even talking....

You can set it up any way you want, its your motor and your wallet. But if you're going to get on a forum and paste information that is not backed by indepth testing, then why post it or take a stern position. The bottom line is that the original thread creator started this thread with intentions of CORRECTLY plumbing his SR20. I have built my SR20 from the ground up, producing over 400whp, and have extensively studied this motor. I've said nothing but factual information. I've also been on this forum since 2003 and have seen this topic covered more than a few times.


Teamsprock....I appreciate your tactful insite..not being sarcastic

[teamsprock]

Sorry for getting off topic, and if I seemed like a jerk I appologize S14unimog.

I think going back and forth I am losing what you are trying to say. So for cliff notes for people doing this in the future.

The BOV should be hooked to the bottom nipple on the TB, or any other source with boost and vacuum.

The wastegate should be the same type of source but with the shortest hose possible. I've never seen any boost problems with running it to the TB but prefer it to be on the hot side myself. This I guess may be dependent on the setup since some people have boost spikes. Again I still think you should be fine but you really don't want to T this off something else, not only is that more line to fill but also more chances of a line coming off and loosing the source.

Also FRP should be a dedicated line when possible. I have a Greddy intake mani so I have 3 ports to use for anything extra, MAP, Boost gauge, ETC.

[s14unimog]

No worries, I also apologize if I've come off inappropriate to you as well.

I agree with everything you've just said but would stress to anyone that it is not worth the chance to deviate from the orientation outlined by Nissan.

I'm also running that manifold....really takes the guess work out of it.

[om3ga]

So as a conclusion,The wastegate boost source should be linked to the hot pipe via a welded on nipple id imagine being the best thing.

The bov should have a line routed to the intake manifold either a nipple on the manifold itself if there is one available? And where is the best place to mount the Bov itself? as i will be welding the flange on i see it mounted on the hot pipe usually but i sometimes see it on the coldpipe. What is better?

[SLiDe_WaYz]

Sooo I dont like the revive OLD threads, but for me and anyone else who may search and find this thread like I did.

I switched from the Greddy manifold which has tons of nipples for vacuum sources to the stock one since I'm not going to be making 350+ hp.

So:
Wastegate - Weld on nipple on hot pipe.
BOV - bottom of throttle body
FPR - top nipple to the right on the TB.
Boost Gauge - ??? to Last vacuum source on manifold which would be right above the TB on the left.

Is this correct ? This is the closest thread I've found to helping from searching. The GReddy manifold makes it so much damn simpler.

I was told earlier today that I should T off a fitting on the manifold above the TB for the boost gauge and wastegate, but personally im not into T'ing anything off.

[blksylv]

wg: nipple on hotpipe
BOV:top right nipple on TB
FPR:top left nipple on tb
Boost Gauge: either t the fpr line or the bov line...

[om3ga]

I ended up running mine like this.

-Wastegate to directly under the Greddy Intake manifold with a T fitting which has a line going to the Boost gauge.

-FPR going directly under the Greddy Intake manifold right next to the nipple for the Wastegate.

-I am not running a bov but if i were it would go to the intake manifold somewhere but it really can go anywhere that see's boost/vacuum.

Full race makes a nice vacuum block that i would recommend getting if you do not have enough ports.
http://www.shop.indigo-gt.co.uk/images/vacblock.jpg

[SLiDe_WaYz]

I ended up running mine like this.

-Wastegate to directly under the Greddy Intake manifold with a T fitting which has a line going to the Boost gauge.

-FPR going directly under the Greddy Intake manifold right next to the nipple for the Wastegate.

-I am not running a bov but if i were it would go to the intake manifold somewhere but it really can go anywhere that see's boost/vacuum.

Full race makes a nice vacuum block that i would recommend getting if you do not have enough ports.
http://www.shop.indigo-gt.co.uk/images/vacblock.jpg



When I was using the GReddy manifold I had more than enough ports. The stock one kinda blows. Ill prob end up getting a vacuum block i like it.