White_FC

Don't suppose that Judge Ito would have anything else to add to this then?



I'm very seriously considering doing a BP, I have a few spare irons I can practice on, i'm just after some info on wether the side seals will survive, and how big I can make the extra bridge port.



250hp at the wheels i assume? was this with S4 or 5 rotors? and at what rpm more importantly?

what intake was he using? quad throttle setup with short runners?

mazdaspeed7

If you bridge both of the ports on the end housings, you wont run into the interference problems I mentioned earlier. Thet was pertaining to an aux bridge motor. If you bridge both ports, you will have *more* port timing than a PP. The powerband will be VERY high.

Baldy

I think I recall you saying something about the bridged-aux. problem having to do with the VDI. Any idea if this would work at all for an S4, or would there still be major problems?

mazdaspeed7

The VDI makes it worse, but ANY manifold that doesnt have seperate runners for the bridged and non-bridged ports will have problems.

Baldy

ok, thanks

pengaru

wasnt that ito built engine running on stock ecu and stock manifolds and making good power?



It sounds to me that mazdaspeed7's statements about the need for seperate runners for every port and it not working well with the stock intake is speculation. It seems like there is proof of it working well enough to make good power. (some people have reported the AFM being a limitation, so perhaps just a standalone or some clever electronics is all you need).





Vosko, if I remember correctly, you knew the person with that car ito built the engine for. Can you provide any details about the setup or estimated power output? Mazdaspeed7's engine was probably capable of great power, I thought he just had issues with the S5 ecu being a limiting factor. This guy has a standalone.

j9fd3s

i think that the s4 intake works better once you port, while the s5 is more tuned to the stock ports. itos car was s4



mike

White_FC

Wellll........



I won't be using either the S4 or 5 inlet manifold, so that doesn't matter to me and the bridged/non-bridged inlet runners 'interfereing' with each other doesn't sound quite right to me.



I can't see the porting timing being too far off of a radical 4 port style bridgeport? as I wont be changing the closing timming of the port, just the opening. So it'll be like a 'normal' bridgeport + ~20deg. longer duration? which is no where near aslong as a PP? no?



Either way I might try this combo out, just looking more about side seal wear, as there doesn't seem to be much iron to be able to take away in that area, so i'm just looking for some tips about bridgeporting basically.

mazdaspeed7

It is speculation, but not a shot in the dark. Everything I know about fluid dynamics tells me there will be problems. It may make decent to good power, but the potential of the port will NEVER be realized with is sharing a runner with a non-bridged port. I know the ECU was a major limiting factor in my motor, as well as the intake manifold, and the exhaust. Also, I think you can get as much hp out of a good SP, and have less issues to deal with. The bridge is very small, so the gains wont be very large.



My aux bridge motor is getting a weber and being dropped in a SA. I cant wait to see that run.

vosko

the car judge ito built was running stock EVERYTHING, full stock exhaust, ECU, AFM, EVEN AIR BOX and it kept up with a S5 T2 with dp,hiflow cat, catback and intake and rebuilt engine....the T2 is a low 14second car..... that car was FAST... i saw it in action a few times and i have driven the T2. i was supposed to drive the N/A but never got a chance