Howdy all, as some of you may know my motor just **** a seal (side seal) so i'm obviously about to start rebuilding it and of course will be porting it while it is out.



So i'm here looking for some ideas about what porting I should do to it. Keeping in mind that I circuit race this car every month(when its running that is ) and this motor will probably end up being turbocharged again in the near future, but we'll leave what turbo i'll be using out of the equation for now. I've heard that big streetports can tend to be rather peaky even on a turbo motor, so I was thinking about bridgeporting the 6-port housings, having just had a very quick look at some(and being a porting newbie) i can't see any reason I couldn't do this?



I was thinking about running the bridge on the secondary port (not the aux port like everyone seems to do) now i know this will create some more overlap, that doesn't phase me to badly, i'm after mid range and a good (not peaky) power delivery.



So guys, I need some ideas, what would YOU all do?

 

I wouldnt do it. Tuning is a pain in the ***, and you will need an intake manifold with individual runners for each port, and a standalone to get power from it. I wasnt very happy with how my aux bridge motor turned out, and am now running a big SP.

 

Yes, You are definately going to need a standalone along with some other mods if you ever want to see the maximum output of that engine. There is no way that the stock ecu could ever handle it.

 

unless u are gonan modify your EFI and get new intake manifolds bridgeportign shoudl really be left alone on your otherwise "stock" car. if u want to do anythgin just bbridge the aux since that wont affect your idle if the 6 port sleeves are still in place, i have yet to dyno teh resulsts from such a ported motor. this car will be on the dyno shortly and i will post results asap.



anything bigger then street port would rreally suck for teh street to have a civilized car, unless like mazdaspeed said u get the standaloen and the mani.

 

I just pulled my aux bridge motor out. I wasnt happy with how it turned out. I NEVER got it to run right with the 6 ports open. The past 15K miles were spent with my 6 ports wired shut. You will need individual runners to get good power out of an aux bridge motor. The HUGE difference in port timing between the 2 ports on the end housing will cause interference since they share the same runner with the stock manifold. That will severly limit the power of an aux bridge motor. Youll need a seperate runner for each port, and the runners for the 6 ports need to be considerably longer to be tuned for the same RPM.



Kahren, tell me about your setup, and how you plan to address these issues. I could help you out, if you like. Ive thought through whats necessary to make it work, it just wasnt worth it to me to go through with it. Im much happier with my SP engine I put in on thursday anyways.

 

Adam; you're saying you don't think it's worth the time/effort to Aux-Bridge an engine when running the stock manifold?



Even w/ a standalone, the stock manifold is enough of a restriction to not warrant the BP?

 

Thats EXACTLY what Im saying. First, the manifold sucks. The runners are too long and narrow. Second, the pulses from the bridged port and the non-bridged port will interfere with each other since they share the same runner. That makes an already poor flowing intake manifold even worse.

 

Thank you all for your replies..



I already am running a microtech in my car and I will be using a different inlet manifold (quad throttle body setup actually) with short runners.



Now I was more interested in if there is enough 'room' to actually run a bridge along the secondary inlet port (and possibly the auxillary one aswell).



If I did it I would do the center plate aswell.



So, has any bridge ported not just the AUX port but the normal secondary port?

 

Judge Ito built a motor like that. From what I heard, it was making good power, around 250 or so. That car ran with a modded TII, and I think it was wrecked before it was dynoed or taken to the track.

 

you are CORRECT!