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Intake manifold vacuum port sources on custom intake


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#1 seattlejester

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Posted 11 February 2017 - 11:06 PM

My intake manifold is going to the welders eventually. Especially now that it is cut up a bit.

 

It is basically a large D tube manifold. Looks to be about 1/4 inch thick.

 

While he has it should I just have him weld on a piece of aluminum bar stock with some holes drilled in it for some vacuum ports?

 

I had 4 ports I used in my last manifold. 

1 x 1/4 for map reference

1 x 1/4 for wastegate

1 x 1/4 for blow off valve

1 x 3/8 for brake booster

 

Or should I just go with fittings like:

http://www.ebay.com/...4FVCJ8a&vxp=mtr

http://www.ebay.com/...K7DU1DA&vxp=mtr

 

Cost would be about the same really. The latter would be easier to do since i just drill and tap and install a fitting. The block would require me to cut a slot and make the piece and drill and tap those for each individual barb. I think those flat profile distribution fittings could look pretty snazzy.

 

I'm not sure on this. Would love to hear your guys thoughts on one over the other or a third option if you have one.



#2 skirkland1980

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Posted 13 February 2017 - 11:48 AM

Mine has two. One to the bov and another to the map sensor with a T to the fuel pressure regulator. Brake vacuum is done with an electric vacuum pump. Wastegate is connected to the compressor housing. I just drilled and tapped into the thicker areas of the plenum. Do you have a picture of yours?
:1983 280zx turbo, L28ET, custom cam grind, 96 saab 900 intercooler w/2.50" piping, 3" mandrel bent exhaust, megasquirt II v3.57, 540cc injectors, walbro gsl392 255lph fuel pump, aeromotive regulator, -6 supply lines, custom fuel rail, MSD ignition wires, MSD 8202 coil, homemade boost controller, Garrett TC4305 turbo, 70mm throttle body, Godzilla BOV, Turbonetics wastegate, custom intake, custom turbo header, Cooling Mist H2O/meth injection, 20psi boost, all stock body, stock interior and weld draglite wheels, TH350 trans 4000 stall with B&M 'street stick' shifter and hughes trans brake, nitto nt555R drag radials, best 1/8 mile of 7.53@ 98 mph

#3 seattlejester

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Posted 13 February 2017 - 01:20 PM

Hmm have a link to the electric vacuum pump? That sounds interesting. Is it on all the time?

 

http://www.ebay.com/...jBW3FZZ&vxp=mtr

 

Same unit as that one.

 

Well after going back and forth I decided the benefit to the NPT would be that it would be self sealing in a way and that the benefit to a vacuum block type arrangement would be that you could use any threaded fitting like a banjo fitting. 

 

I ended up buying the 3 port fitting and found a spot to tap the back of the manifold for an independent brake booster fitting. I think it will end up looking pretty snazzy, if it ends up leaking horridly I'll have to just go with a block.



#4 skirkland1980

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Posted 13 February 2017 - 01:30 PM

The vacuum pump is something I found on eBay. It was a new Ford part. I don't know what it actually fits. I have the pump wired to a relay which is triggered by the brake switch so it only runs while pressing the brake pedal. Since the booster is sealed it always holds a vacuum so no worries about an initial hard pedal. Works great.
:1983 280zx turbo, L28ET, custom cam grind, 96 saab 900 intercooler w/2.50" piping, 3" mandrel bent exhaust, megasquirt II v3.57, 540cc injectors, walbro gsl392 255lph fuel pump, aeromotive regulator, -6 supply lines, custom fuel rail, MSD ignition wires, MSD 8202 coil, homemade boost controller, Garrett TC4305 turbo, 70mm throttle body, Godzilla BOV, Turbonetics wastegate, custom intake, custom turbo header, Cooling Mist H2O/meth injection, 20psi boost, all stock body, stock interior and weld draglite wheels, TH350 trans 4000 stall with B&M 'street stick' shifter and hughes trans brake, nitto nt555R drag radials, best 1/8 mile of 7.53@ 98 mph

#5 skirkland1980

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Posted 13 February 2017 - 01:38 PM

Here is the vacuum pump I used.

Attached Files


:1983 280zx turbo, L28ET, custom cam grind, 96 saab 900 intercooler w/2.50" piping, 3" mandrel bent exhaust, megasquirt II v3.57, 540cc injectors, walbro gsl392 255lph fuel pump, aeromotive regulator, -6 supply lines, custom fuel rail, MSD ignition wires, MSD 8202 coil, homemade boost controller, Garrett TC4305 turbo, 70mm throttle body, Godzilla BOV, Turbonetics wastegate, custom intake, custom turbo header, Cooling Mist H2O/meth injection, 20psi boost, all stock body, stock interior and weld draglite wheels, TH350 trans 4000 stall with B&M 'street stick' shifter and hughes trans brake, nitto nt555R drag radials, best 1/8 mile of 7.53@ 98 mph

#6 seattlejester

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Posted 13 February 2017 - 01:49 PM

Thanks for that, that's pretty darn cool. Not too much load when it kicks on?



#7 skirkland1980

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Posted 13 February 2017 - 04:26 PM

Its not too bad. I use my car for drag racing so when I'm in the staging lanes I use the ebrake instead. My alternator is only 80 amps. Plus I'm using a ati damper with a ridiculous underdrive pulley and a 17" electric fan. Keeping up with demand is tough. I need more alternator.
:1983 280zx turbo, L28ET, custom cam grind, 96 saab 900 intercooler w/2.50" piping, 3" mandrel bent exhaust, megasquirt II v3.57, 540cc injectors, walbro gsl392 255lph fuel pump, aeromotive regulator, -6 supply lines, custom fuel rail, MSD ignition wires, MSD 8202 coil, homemade boost controller, Garrett TC4305 turbo, 70mm throttle body, Godzilla BOV, Turbonetics wastegate, custom intake, custom turbo header, Cooling Mist H2O/meth injection, 20psi boost, all stock body, stock interior and weld draglite wheels, TH350 trans 4000 stall with B&M 'street stick' shifter and hughes trans brake, nitto nt555R drag radials, best 1/8 mile of 7.53@ 98 mph




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