BNR stage III, but what engine port to go with??
09-13-06, 01:54 AM
#1
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
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
09-13-06, 02:31 AM
#3
Where has my $ gone?
iTrader: (12)
Join Date: Feb 2004
Location: Bay Area, Cal/Phoenix, AZ
Posts: 1,654
Likes: 0
Received 7 Likes
on
2 Posts
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.
09-13-06, 08:53 AM
#5
09-13-06, 10:30 AM
#6
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
Posts: 14,716
Likes: 0
Received 8 Likes
on
8 Posts
Here's how a mild-to-medium streetport pulls with sequential BNR Stage 3s....
https://www.rx7club.com/showpost.php...52&postcount=9
https://www.rx7club.com/showpost.php...52&postcount=9
09-13-06, 11:41 AM
#7
Rotary Enthusiast
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.
Apexi Intakes, HKS DP, RB DT catback, Trust SMIC, PFC, 550/1200cc, Supra TT pump, ACT/9.5 flywheel.
Trending Topics
09-13-06, 12:09 PM
#8
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
Posts: 14,716
Likes: 0
Received 8 Likes
on
8 Posts
Originally Posted by tphan
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.
Apexi Intakes, HKS DP, RB DT catback, Trust SMIC, PFC, 550/1200cc, Supra TT pump, ACT/9.5 flywheel.
09-13-06, 12:53 PM
#11
Originally Posted by MakoRacing
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.
cheers
09-13-06, 12:57 PM
#13
Originally Posted by mb7
Serious. I run about 17psi on mine and they rip. But I am now maxing out my fuel system... 850s and 1300s 
09-13-06, 03:14 PM
#15
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
Posts: 14,716
Likes: 0
Received 8 Likes
on
8 Posts
Originally Posted by tphan
are you being serious or sarcasm :-)
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.
09-13-06, 04:31 PM
#16
Full Member
Join Date: Aug 2001
Location: Greenwood, SC
Posts: 89
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mazdabation
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?!
09-14-06, 10:26 PM
#19
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.
09-14-06, 10:35 PM
#20
Original Gangster/Rotary!
iTrader: (213)
Originally Posted by Mazdabation
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?
09-15-06, 01:57 AM
#21
Originally Posted by GoodfellaFD3S
I've heard rumors of stuck side seals. I have no firsthand experience, perhaps he'll chime in......
Last edited by Mazdabation; 09-15-06 at 02:03 AM.
09-15-06, 02:01 AM
#22
Originally Posted by PDViper77
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.
09-15-06, 08:36 AM
#23
Original Gangster/Rotary!
iTrader: (213)
Originally Posted by Mazdabation
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
Re: the porting, just find a reputable porter/builder. Hell, ship me the engine
