Factory Vacuum Source For NPP?
Thread Starter
Instructor
Joined: May 2008
Posts: 239
Likes: 4
Factory Vacuum Source For NPP?
Hi,
Just installed a Z06 exhaust on my car and I'm wondering where the factory normally taps the vacuum from on the NPP option. I can certainly pull it from the power brakes, but just want to know how it's done from GM.
Thanks.
Just installed a Z06 exhaust on my car and I'm wondering where the factory normally taps the vacuum from on the NPP option. I can certainly pull it from the power brakes, but just want to know how it's done from GM.
Thanks.
Burning Brakes
Joined: Oct 2006
Posts: 995
Likes: 2
From: Virginia Beach VA
It's already there...
GM taps the rear of the manifold, on the rear of my '05 stock intake there is an untapped vac fitting right next to the brake booster fitting. I can only assume later years have the same fitting, although the LS3 intake is a different part #, but thats when the NPPs came out so the fitting is probably the same. Given its placement, its going to tough maybe impossible to get to (w/o removing the manifold), but its there. I have a FAST & there's a short vac line up front from the top of the motor to just behind the throttle body where I tapped in. I have heard people warn against going into the brake line to avoid loosing power brake assist w/ a leak creating a safety issue. However unlikely, I avoided the brake vac line, & I went up front.
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Back of a stock intake manifold from my '05. The large right angle port is the brake booster, the smaller straight fitting with the "T" shaped cap is the vacuum source.
Last edited by haljensen; Jul 13, 2008 at 04:53 PM.
Race Director
Joined: Jan 2005
Posts: 13,656
Likes: 7
From: Bay Shore, NY 11706 MILD2WILD (M2W)
St. Jude Donor '06-'07
