Well, this has been in the works for quite a while now.. Finally getting to work on it.
I'm working with a local shop called Boost Flow Technologies on a custom RB20 intake manifold. The manifold is built and were trying to work on the finishing touches.
I have some questions and I would be very greatful to you guys for any help you can give me.
First off... Here's the manifold.. (sorry for the picture quality... camera phone)
Here's the engine bay currently..
Here are my questions...
1.) Vacuum ports in the manifold itself... We are planning to mount the AAC on the top of the manifold between cylanders 5 and 6. We are going to mount another vacuum port on the right side of the manifold opposite of cylander 6 runner. That vacuum port is going to this vacuum manifold... http://cgi.ebay.com/ebaymotors...QrdZ1From
the vacuum manifold were planning to run the other necessary vacuum lines.. brake booster, fuel pressure regulator, boost gauge, the tubes on top of the valve covers.
Q - What other ports or vacuum lines should I remember to run? We can throw more onto the manifold itself if needed (Should we do that for the brake booster since that's a big line?)
2.) Coolant lines... The stock intake manifold and lower runners have a maze of lines and channels for coolant. We cut off the lower runners on a spare intake manifold and welded them to the new manifold to preserve the coolant passages. I have some questions though on how to route new coolant lines... what's necessary and what can be blocked and negated.
There's a line on the lower runners that runs parallel to the fuel rail. On the end of that line it cuts to the right and a small tube runs toward the fender, then up to the top of the intake manifold where the bleeder screw is located. Then that line exits the bleeder on the manifold and heads directly to the throttle body. From the other side of the throttle body it runs back down to the block.
Q - Can we get away with eliminating the run to the bleeder and then to the throttle body? Can we just run a line from the exit on the runner before the bleeder straight back to the block after the throttle body? Obviously the bleeder is there for a reason... but how would you build some sort of bleeder onto a custom manifold? Is there another way to bleed the coolant system of any air bubbles if you get rid of this bleeder screw? What's the point of running coolant to the throttle body??? Is this necessary?
3.) Battery relocation. In order to run the cold side piping up from the FMIC, we have to move the battery to the trunk. I got a kit from Summitt Racing... install is pretty self explanatory. But I ran into one question. Q - The old ground wire from the battery runs to the base of the battery tray and connects to the metal on the wheel well. Then it runs out of that same point and goes to the engine block. Does the engine block need to be grounded to the chassis? Or can I just remove that ground wire entirely? I don't know if going to the block is just an additional insurance ground for the battery, or if the block actually needs to have some grounding?
4.) What the heck is this thing... Is it for the closed loop cold start system??I'm referring to the metal piece toward the top of the picture... not the AAC. It's got a black electrical plug on one end and two vacuum ports on either side... not sure if it's measuring the intake air temp, or actually controlling the air intake during startup cold loop...?What is it? Where does it go?
Thanks so much for any advice you can give me. Hopefully I don't sound like too much of a noob for asking them.. .
Modified by Eikon at 10:51 AM 6/15/2006