j200pruf

iTrader: (4)

It was mazdaspeed7, search for his posts, I think that he might be getting tired of telling ppl this all the time. But he said that his never was running with the aux ports open.

MPM

He never got his version of a bridge ported 6-port to run good. It doesn't mean it can't be done, just that he couldn't do it on that particular engine.

nonameo

yes. I remember talking to him about this. It was because of:

stock ecu

needed separate runners from the secondaries AND needed unequal lengths.

port timing was not right

His power was not cutting on till... 8k I think?

He mentioned that if you bridged both the secondaries and the aux's with a bridge that you could have them on the same runner because the port timing would be the same(??? I think?) and it would not kill the inertial supercharging effect.

this is not stuff that I <--- came up with but was told and read up on and tried to understand later.

Aaron Cake

iTrader: (1)

I am in the process of doing this right now. Of course, while my engine is not an NA, it still is a 6 port. I'm starting with the Mazdatrix 6 port street port template and modifying from there for bridge over the secondaries (and primaries if I have space). Exhaust is ported with a Racing Beat "race" 13B exhaust template. It's nowhere near done yet, so I can't say how well it works...

NZConvertible

I can't see the point of only bridgeporting the auxiliary ports. A bridgeport is simply a bigger port, it's nothing magical. Since the auxiliary ports only contribute about a quarter of the engine's total flow, the overall improvement is not going to be much considering the amount of work involved.

IMO, bridgeporting both secondary and auxiliary ports would be a minimum.

j200pruf

iTrader: (4)

But NZ, I think that a lot of ppl want just the Aux ports for drivability, and being able to pass smog. But I am trying to figure out a way to make some actuators out of butterfly throttle stops for both the aux and secondary ports. I am just not sure if the engine will run enough for smog on just the primary ports.

nonameo

The aux ports will open earlier if they are bridged... not as in opening at an earlier RPM, but opening the port sooner in the cycle.

Kim

Concerned about activation of the sleeves when going emissionless, and flow of the aux. ports then go euro.spec endplates

European spec. irons has no sleeves and better port flow


LIM with butterfly valves


IMO(might be wrong) going bridge on a N/A is all about the brap-brap-brap, TWM throttlebodys and microtech or the like, will probably get you the same amount of power and better streetability

j200pruf

iTrader: (4)

Kim that is exactly what I was planning, only with a IDA manifold. I am going to macine a spacer to go between the manifold and the block that will hold some butterflys for the aux ports, maybe even the secondarys, I just need to figure out if the engine will run at all on just the primary ports.

hpram99

I forgot about the euro-style LIM. That would definately solve the problem with the aux. port opening.

BigTone

Where the hell would you find a euro-spec LIM? I sure would like one.

hpram99

I've seen a few posts for them in the buy/sell section.

They get around.

p.s. just a hint, not everyone lives in north america.

BigTone

...really . Trying to find one stateside so that you dont have to pay an arm and leg for shipping would be nice.

Kim

Try hIGGI, european forum moderator

NZConvertible

Personally I think these are over-rated. Has anyone ever seen any back-to-back testing or analysis? Just from looking at it I doubt you'd see huge differences. You still have an open valve in the way of airflow.

If they were that good, they wouldn't have been confined to a relatively small market, and probably would've appeared on the RX-8.

MPM

Just make your own euro spec end plates. I used devcon on my Alabama spec plates. But then again I'm not using a euro spec lower intake manifold either. I've removed all the actuator stuff and cleaned the air flow up thru the lower intake. More devcon was needed for that also.