BNR stage III, but what engine port to go with??
 

I have searched and most topics concern how the BNRs are liked, and/or how they compare to other set ups. I have the stage III's already, car runs great but for future reference when time comes i would like to know my best options.

The car is a weekend only driver, and not every weekend at that. So DD reliability is not as much a concern. I do want to make optimum power on these twins so......
What port would work best with these twins? Should I go full bridge, half, street, agressive street?? Ahhhhhh to many to choose!!

There are so many people out there that do porting, but I always here how one persons port work can be so much different from another, Banzai, rx7 store, Pinapple, etc etc. how do you know one persons street or brige is not different form another?

So you know i have....

BNR III's sequential
550 & 1300 inj
FULL 4" exh
3" DP
ARC smic
inovative WB
PFC
HKS Ign
modified stock air bok with K&N

Healthy streetport

Id do a streetport, half bridge might work good too but since its a weekend car and not a track car thatd be pretty much overkill IMO, plus a healthy bridge idle would call even more attention to an already standout car.

go balls out... Peripheral port, you dont really need to idle anyway.

Healthy streetport will yield good results. No point in going with the half bridgie if you're sequential. Man oh man are you going to love the powerband :)

Here's how a mild-to-medium streetport pulls with sequential BNR Stage 3s....

https://www.rx7club.com/showpost.php...52&postcount=9

Would BNR Stage III an overkill on 53K miles stock motor with following mods? hp?

Apexi Intakes, HKS DP, RB DT catback, Trust SMIC, PFC, 550/1200cc, Supra TT pump, ACT/9.5 flywheel.

Dude, get a midpipe and the BNRs, crank it up to 15-16 psi and have fun. :)

are you being serious or sarcasm :-)

Serious. I run about 17psi on mine and they rip. But I am now maxing out my fuel system... 850s and 1300s :(

Yes a weekend car but my monster HEHE, Im not worried about idle or others thoughts, just the optimum from these, so thats why i was thinking half bridge.
cheers

haha and what would be considerede a "healthy streetport"? Im just not sure what to tell the builder.
Is it true one mans work can be different from anothers porting job?

How are you maxing out, I have 550 and 1300 tuned by Steve Kan and he said there is plenty of fuel left at 16psi?!

Half bridge is a waste of time, if your gonna go bridge go full bridge.

I was serious, if that's what you want for the car. If you are content with driving around at 12-13 psi with the stock cat, I would not spend money on new turbos unless your's are shot.


To the guys recommending anything more than a streetport.....these are SEQUENTIAL TWINS. There is no point shifting the powerband farther up than a streetport already does with the stock exhaust manifold. A bridge-port would be wasted with sequential twins and has too many compromises as compared to a streetport.

Not sure, Mine is very strong and running at 11.2 A/F. It has a Steve Kan special port job on it, maybe that has something to do with it. I have seen Injector duty spikes to 100%, very scary.

Any opinions on the "judge Ito street port"? I have seen his template going around but have heard mixed reviews on it. Any feedback on that?

^

A half-bridge, such as mine, would be a waste on your sequential twins. If you had a large single turbo then yes, a bridge-ported motor would be right for you. Since you still have twins, especially since you are running them sequentially, a street port would be a better choice for your setup.

I've heard rumors of stuck side seals. I have no firsthand experience, perhaps he'll chime in......

Thanx rich, this what i mean by how not all peoples porting jobs are equal. Ones streetport can be different from anothers, So how do i know that the person doing the porting will give me the "healthy steetport" that im looking for? Optimum porting with out doing damage?

I do see your point, especially being sequential. The reason i though half bridge would be ok was becuase i assumed the BNR's could flow more, enough to support this type of porting job

I think for non-seq BNRs at 17-19 psi a bridgeport might have it's place. Sequential, not so sure.

Re: the porting, just find a reputable porter/builder. Hell, ship me the engine :)

Thanks for all the good impute on this thread, this is definitely helping to shape the plans on my FD project.

I just thought since I was reading this I'd bump it to the surface to show people that there is a search function on this website... lol

^--- agreed