Firewall vacuum connection

FrostZ34 · 10-18-2021, 09:12 PM

I’m trying to figure out what this hose goes to. It’s centerline just behind the manifold and under the front strut bar studs. Sorry for the terrible pictures.

Spooler · 10-18-2021, 10:45 PM

Looks like brake booster. Is it on the drivers side of the car?

FrostZ34 · 10-19-2021, 06:42 AM

It’s dead center of the car

Dreadnaught · 10-20-2021, 08:17 PM

It could be for the brakes, but, usually the vacuum line would take the shortest path from the intake manifold to brake booster housing unless Nissan decided to route it behind the bulkhead.

I don't think there is anything under the dash that is vacuum operated.

Check the work shop manual to see the diagram.

Spooler · 10-20-2021, 08:42 PM

I keep forgetting to look for it on my car. I was working on it this afternoon. Too late now.

Dreadnaught · 10-20-2021, 08:57 PM

OP, take the cowling off and I imagine you can see what the vacuum line goes too.

javi370z · 10-21-2021, 09:15 AM

It goes to the brake booster

FrostZ34 · 10-22-2021, 08:14 PM

Okay, everyone was right… it was for the brake booster. Is anyone running the Motordyne M370 manifold? The directions say that connection is where the PCV connects.

1slow370 · 10-27-2021, 09:06 PM

nah the pcvs are in the valve covers in front and go to the two front ports

Edit: you have an hr manifold that only has no "pcv" barbs, so you are going to have to y connect them and run that to a t on the brake booster barb.

10-18-2021, 10:45 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,797 Drives: 2013 Nismo 370z Rep Power: 2684392	Looks like brake booster. Is it on the drivers side of the car? FrostZ34 likes this.

10-20-2021, 08:17 PM	#4 (permalink)
Dreadnaught Track Member Join Date: Dec 2009 Location: Farmington, Utah Posts: 582 Drives: 14 SR 370z 6MT Rep Power: 10139	It could be for the brakes, but, usually the vacuum line would take the shortest path from the intake manifold to brake booster housing unless Nissan decided to route it behind the bulkhead. I don't think there is anything under the dash that is vacuum operated. Check the work shop manual to see the diagram. __________________ Ford Diesel and Heavy Line Technician at your service.

10-20-2021, 08:57 PM	#6 (permalink)
Dreadnaught Track Member Join Date: Dec 2009 Location: Farmington, Utah Posts: 582 Drives: 14 SR 370z 6MT Rep Power: 10139	OP, take the cowling off and I imagine you can see what the vacuum line goes too. __________________ Ford Diesel and Heavy Line Technician at your service.

10-27-2021, 09:06 PM	#9 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	nah the pcvs are in the valve covers in front and go to the two front ports Edit: you have an hr manifold that only has no "pcv" barbs, so you are going to have to y connect them and run that to a t on the brake booster barb. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 10-27-2021 at 09:11 PM.

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10-19-2021, 06:42 AM	#3 (permalink)
FrostZ34 Base Member Join Date: Oct 2015 Location: Summerville, SC Posts: 14 Drives: 2014 370z silver 6mt Rep Power: 10	It’s dead center of the car

10-20-2021, 08:42 PM	#5 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,797 Drives: 2013 Nismo 370z Rep Power: 2684392	I keep forgetting to look for it on my car. I was working on it this afternoon. Too late now.

10-21-2021, 09:15 AM	#7 (permalink)
javi370z Base Member Join Date: Nov 2012 Location: dallas Posts: 118 Drives: 370z Rep Power: 13	It goes to the brake booster

10-22-2021, 08:14 PM	#8 (permalink)
FrostZ34 Base Member Join Date: Oct 2015 Location: Summerville, SC Posts: 14 Drives: 2014 370z silver 6mt Rep Power: 10	Okay, everyone was right… it was for the brake booster. Is anyone running the Motordyne M370 manifold? The directions say that connection is where the PCV connects.