Suds

I have ripped a 90 n/a engine out of a junk yard (and I have torn it down) and I am going to mill out a bridge (myself, at a machine shop). I have a S-AFC. I assume I will need larger injectors (550cc?), a larger fuel pump. Will I need a larger radiator? Anything else? I have searched, but all the posts were about TII bridges, I have gleaned this information from those posts. Any additional input appreciated.

Suds

Partial bridge btw Intermediate housing.

mazdaspeed7

Why would you bridge the intermediate housing if youre only doing a partial BP? If you do a partial BP, the secondary ports are the ones to bridge. Youre going to need a new ECU with the rev limiter raised, a S-afc and probably 720 cc secondaries, a better fuel pump, such as walbro, an adjustable FPR so that pump doesnt make your car run way too rich at idle, UD pulleys so the water pump doesnt cavitate, a light weight flywheel, aftermarket clutch and PP, E-fan, etc. Not to mention the race bearings youll need, and full balancing of the motor, etc.

Its a lot of work and money. You could probably do it cheaper, but its asking for trouble.

Oh, and bridgeporting a 6 port engine is going to KILL your drivability. The bottom end is going to be pathetic, and the top end will be way below what it could be, because the intake manifolds simply dont flow enough air to make that kind of power.

mazdaspeed7

One more thing, you will NEVER pass emissions with that motor.

Suds

Yeah I know I won't pass emissions, that is why I bought another motor and why I am going to do the swap after I smog (next NOV) then two years after that I will put a renny in

Damn, alot of money... BIG street port!

Alot of that junk is for 8000rpm plus operation, I won't go above 8500 so no worry about rev limiter, and It will be a SMALL bridge.

mazdaspeed7

If you dont want to go past 8500 rpm, and you have a S5 motor, a street port is what you want. A bridgeport will move your redline beyond 9000 rpm, so youll be missing on a lot of power petential, and still having a SHITTY idle/low end. Go with a street port and a free flowing intake/exhaust. Youll be plenty happy. My stock port motor pulls strong to 8500. Ive hit the rev limiter on accident a few too many times while racing. My car is just still pulling good up that high.

89allrotor13b

i've got a 89 n/a with a rebuild including street port and 3mm seals. It is a screamer past 8000. I would think A ported intake manifold would make all the difference. I am working on that.

scathcart

Can you turbo a PP? I'm gonna have a spare S5 13BT with only 10K on it laying around after my next engine swap, and I was thinking about building a motor I could swap in for the track.

If not, I'll just go with a monster bridge and turbo that.

mazdaspeed7

Scathcart., its very possible. Not to mention makes SICK power. But im sure you know youll need an aftermarket EMS, and a motor built for high rpm, high boost. Im not too sure on the seals required, and if stock seals will work. Start a post in the single turbo section...thats where the real tuners and very knowledgable people hang out. Youre going to need VERY large injectors though, possibly 4 x 1200 or something along those lines.

scathcart

I will defintely be running a Haltech. I will be swapping out my custom street motor, so the haltech will alreadfy be in there. Load up a new map and go.

I just wanted to see what I could do with a 2 rotor. I'm sure my 3 rotor will be faster. I mean, all aluminum housings, race rotors, twin turbos, 3 piece e-shaft, extra intermediate bearing pressed into the front intermediate housing, 6x 1600cc injectors, dry sump oiling, electric water pump, dual stage direct port nitrous oxide, and a large street port.

No, she won't see much street use, and will be powerful as hell (an expensive as much as well.) but will be the ultimate engine to drive with. I can't wait to start ordering parts. Only one month away...

Everyone drools over Jimlabs motor... I'll give him a run for his money (but don't worry, I won't put it in a vette.)

But yeah, my 13BT will need some attention too, and I wanna see what I can get out of a PP. I'm also gonna build up a street ported NA motor to see how fast they can cactually run. I mean, I already have alomst every mod needed, and a haltech.

I worked my *** off all summer in a hellish job for this, so I don't wanna hear any wasting money stories...