Like I said in the ITB's project, there's another intake manifold coming up. As the 300zx is still in my driveway, it will serve again as a test and dyno mule.
With the ITB manifold everything was designed for maximum performance explaining the large plenums and custom intercooler pipes. This time the manifold should be easier to fit by making use of more OEM parts, and being much cheaper to fabricate. Modifying the valve covers, fuel rails and ignition coil brackets is still required though. The length of the intake runners is just as long as the ITB manifold, around 39cm which is a good value for what most vg30's are tuned to.
This manifold has smaller plenums that hook up to OEM throttle bodies. The plenum volume is roughly 1,5 liters per side, only slightly larger than stock. However, due to the improved design and more central TB location going any bigger won't really do any good. I milled the TB flanges to 58mm in case it's being tested on a car with enlarged TB's. The TB's will be linked by cables requiring some work to them. I'll have to fit the manifold to the car and check fit and clearance for the lever setup in the final stages.
The TB's sit at a 45 degree angle and face downwards about 10 degrees. By using just a 60mm 45 degree hose it can be directly hooked up to a hard pipe kit. For a 'soft' hose connection, a short 45 degree aluminum bend can be fabricated.
So far it has come to what you see in the pics below. The Border fuel kit fits without problems after I mill the excess material away. The stock fuel rails require new fittings fabricated at the ends, and removal of the original hose fittings. Welding the fuel rails is a bad idea I've learned so they must be hard soldered. This project should go much faster and the modifications to the coils, fuel rails and valve covers are already done. The welds may look a bit odd around the plenum cause of polishing residue.
This manifold is also going to fit with top feeds. The bolts that hold the velocity stacks in place first bolt into the plenum floor and are again secured once the manifold is welded shut. The heat from welding destroys any sealant put around the bolts so after it is fully welded additional nuts are screwed up and sealed against them.
Like I said in the ITB's project, there's another intake manifold coming up. As the 300zx is still in my driveway, it will serve again as a test and dyno mule.
With the ITB manifold everything was designed for maximum performance explaining the large plenums and custom intercooler pipes. This time the manifold should be easier to fit by making use of more OEM parts, and being much cheaper to fabricate. Modifying the valve covers, fuel rails and ignition coil brackets is still required though. The length of the intake runners is just as long as the ITB manifold, around 39cm which is a good value for what most vg30's are tuned to.
This manifold has smaller plenums that hook up to OEM throttle bodies. The plenum volume is roughly 1,5 liters per side, only slightly larger than stock. However, due to the improved design and more central TB location going any bigger won't really do any good. I milled the TB flanges to 58mm in case it's being tested on a car with enlarged TB's. The TB's will be linked by cables requiring some work to them. I'll have to fit the manifold to the car and check fit and clearance for the lever setup in the final stages.
The TB's sit at a 45 degree angle and face downwards about 10 degrees. By using just a 60mm 45 degree hose it can be directly hooked up to a hard pipe kit. For a 'soft' hose connection, a short 45 degree aluminum bend can be fabricated.
So far it has come to what you see in the pics below. The Border fuel kit fits without problems after I mill the excess material away. The stock fuel rails require new fittings fabricated at the ends, and removal of the original hose fittings. Welding the fuel rails is a bad idea I've learned so they must be hard soldered. This project should go much faster and the modifications to the coils, fuel rails and valve covers are already done. The welds may look a bit odd around the plenum cause of polishing residue.
This manifold is also going to fit with top feeds. The bolts that hold the velocity stacks in place first bolt into the plenum floor and are again secured once the manifold is welded shut. The heat from welding destroys any sealant put around the bolts so after it is fully welded additional nuts are screwed up and sealed against them.
-Rutger