6 port BP manifold, yes... really.

[sen2two]

The only reason I'm doing this is the car was kinda given to me. Motor was good but had a bad coolant seal. I'm re-using everything and is only costing me a grand total of 200 bucks for new soft seals. So It's time for some real experimentation to push the "stock" limits.

What i am doing is a FULL bridge 6 port. By full, i mean full. All 6 ports will have a decent sized bridge port. With a decent sized street port also. this WILL be done on the stock ECU. And yes i know, not many have actually gotten this to work. But I have done it with a friend a long time ago, but we knew far less than i know now. And it did work decent. That was also a 4 port though. I also remember ITO doing this a few years back with pretty damn good success. Stock ECU, manifolds, ect...

I will do some slight tuning with the stock s4 AFM which can actually get you pretty close. And do some minor tuning with a simple SAFC. These two little things can get you close, but not perfect.

OK, that's a little back story. The major problem that people have when doing 6 port BP is the stock intake manifold. Yes, switching to a TII manifold and port matching is easy, but what fun is that? What I am in the process of doing is using the stock 6 port lower (modding it slightly), and making a manifold in-between for the stock TB.

The question i have is whether i should have plenum or not. I the picture i drew in paint (i'm a much better fabricator than i am artist ) the one on the far left has no plenum. The secondary runners will have there own dedicated throttles. But the primary runners will meet just before the TB and join into one at the primary throttle plate. Just as the stock manifold would have them separated.

But the two pics to the right show all four runners joining a similar plenum just like they would come together in a 4 cylinder turbo manifold. The only real benefit making want to do it this way is i can machine out a a plate with velocity stacks. But i like the primary and secondary's being separated...

Any advice, on this would help...

Don't hate on the 6 port BP. It's just for fun... and I already did the porting. No turning back now.