Hello, im doing a Gen V swap on my L67 that I have a couple questions about.

First, Im doing a northstar throttle body on it, and I dont have a vacuum port on my adapter plate. So without putting the stock vacuum plate back on it, what would be a good way to get vacuum to the brake booster?

Second question could be related to the first, pardon my lack of knowing the names of parts, but I have the vacuum tube on the supercharger blocked off, and well as both the ports on top, and the port on the side of the sc next to the vacuum tube, which I believe is the evap. Is that alright?

So to sum it up, Im wondering how to bet boost to the brakes and if the way I have it set up is correct. Thanks for all of yalls help

Here is what I have so far.

My guess is to remove the vacumm blockoff on the SC. that is where mine is getting vacuum for the brake booster. the fuel pres. regulator and the maps sensor are getting vacuum off a "T" in the lower intake manifold just under the TB.

The vacuum for the brake booster is taken off of the reversible plastic black fitting on top of the supercharger not at the throttle body.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

I know thats where it it suppose to get vacuum from, but I want a clean appearance, so I blocked both of those off. where I had my gen 3 I had the vacuum on the tb, but on the northstar there is nowhere to hook it up to. I was thinking about putting it on the vacuum tube, but not sure if that would work.

What vacuum tube?? Not the PCV on the Gen V right? That won't work!

This tube is for the PCV to breath in filtered air.

You can drill and tap the side of the Gen V/Northstar adapter plate, and place a vacuum nipple there. Only problem with that, is that you'll be limited in how large a vacuum fitting you can attach by how thick the adapter plate is, or by the design of the plate itself. Perhaps you can make your own adaptor that is extra thick? Either way, between the TB, and the SC is an ideal place to pull brake vacuum from. You need something with at LEAST 3/8" I.D. to recieve enough vacuum flow to operate the brake booster. Any smaller, you run an elevated risk of running out of boost in repeated braking.

quote Originally posted by fierogt27: I know thats where it it suppose to get vacuum from, but I want a clean appearance, so I blocked both of those off. where I had my gen 3 I had the vacuum on the tb, but on the northstar there is nowhere to hook it up to. I was thinking about putting it on the vacuum tube, but not sure if that would work.

The N* TB adapter that I have made by Brian Teel has a 1/4" NPT pipe plug on the side. Does yours have the pipe plug? If so it would be a simple matter of installing a hose fitting.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Neither my tb nor adapter plate have a pipe in them. I also have my pvc blocked off from the advice I recieved. I was told if I run a breather I would be alight. If I was to make my pvc functional, I would have to drill into the tb adapter plate, but how would I install the pipe? I dont have any welding capabilities. To make things more simple, I may go ahead and and install a vacuum tree for the brake booster. If I install the vacuum tree, could I run the pvc and brake booster off the vacuum tree so I wouldnt have to drill the adapter plate?

quote Originally posted by fierogt27: I also have my pvc blocked off from the advice I received. I was told if I run a breather I would be alight?

Who ever told you to block off the PVC valve is giving out poor advice. The function of a PCV valve is to control the flow of crankcase gases. The engine is designed and the engine management calibrated to work with a PCV valve. Without the PCV you can get excessive crankcase pressure which blows oil out the breathers. Excessive crankcase pressure increases resistance on the piston traveling downward and may unseat the rings, costing you power. Without a PVC function you also stand a chance of 1. blowing engine oil seals. 2. increasing blow by deposits and if the PCV flow is eliminated it will effect the MAF readings resulting in poor mileage. Eliminating the PCV valve will cause the buildup of exhaust gases and moisture in the engine; sludge deposits in the engine can occur as a side effect. These deposits will increase the mechanical resistance inside the engine, reducing engine efficiency and increasing fuel consumption.
My advise is to keep the fresh air flowing through the crankcase with the PCV valve. It helps, not harms the engine. You can use a breather on one of the valve covers to allow fresh air in.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Slow your roll there a bit Dennis... He was merely saying someone suggested he block all of the fresh air feeds and run a breather... while it is a pretty crap way of doing it and usually using the stock draws are easier.. it is generally accepted as a perfectly fine practice.

OP, you can run the fresh air tube to any spot in the intake tube in reality.. although anywhere between the throttle blade and the maf sensor is considered ideal.

[This message has been edited by darkhorizon (edited 09-14-2012).]

should I just drill a 3/8 hole into the pipe between the tb and maf and put a snout in and run a short hose in between that and the PVC? If I do, how should I put the snout in, what would be an good way to install it without welding?

[This message has been edited by fierogt27 (edited 09-14-2012).]

Bump

I have to do a Gev V swap on a car soon and will have to deal with this same issue. I will probally tap the EGR hole in the LIM to run off it. This is the method I use on my Gen 3 swapped car. If I dont go that route I will drill/tap either the TB adapter plate of the neck on the GenV right after the TB.

I have a GEN V and I'm using the stock vacuum port. Just rotate teh outlet to face backwards and install your brake booster there. Looks clean to me.

I now have a functioning PVC and brake booster, I'll post pictures of it tonight

Here is how it looks with the brake booster connection reversed and on top.


I don't think that it looks terrible. Certainly not the cleanest install overall but it looks decent to me.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

quote Originally posted by Dennis LaGrua: Here is how it looks with the brake booster connection reversed and on top. I don't think that it looks terrible. Certainly not the cleanest install overall but it looks decent to me.

The wiring is what kills that swap,,,,,,Over then that not a bad looking swap....

Dennis, I'm confused, you were saying I needed to run a PVC but I dont see one on your swap. I'm not trying to call you out, but just confused. I would rather not run one cause of the cleaner appearance without it