BNR Stage 3 Turbo Upgrade 93+ RX-7 or Efini Twin Turbos
09-07-08 | 07:08 PM
#26
I wouldn't run ANY sequential twins at anything higher than 15 psi on pump gas.
That said, I made 365@15 psi on a small streetport w/ 99's. They've been reliable for years at that boost. Rynberg made the same w/ BNRs at the same boost and similar setup. The most I've heard of sequential twins making, even with the most breathed-out set-up (mine is nothing special) is maybe 10 hp more.
The point is, it doesn't matter what you bolt onto the stock sequential manifold after a certain point, it's the bottleneck. I think Mazda knew that, and so they didn't try to make the turbos bigger, just more efficient and fast-spooling at the same peak power.
So Saying "I bolted them on and only got 7 hp, so they're a rip" as some have, misses the point. NOTHING you bolt on is going to do much better.
That said, I made 365@15 psi on a small streetport w/ 99's. They've been reliable for years at that boost. Rynberg made the same w/ BNRs at the same boost and similar setup. The most I've heard of sequential twins making, even with the most breathed-out set-up (mine is nothing special) is maybe 10 hp more.
The point is, it doesn't matter what you bolt onto the stock sequential manifold after a certain point, it's the bottleneck. I think Mazda knew that, and so they didn't try to make the turbos bigger, just more efficient and fast-spooling at the same peak power.
So Saying "I bolted them on and only got 7 hp, so they're a rip" as some have, misses the point. NOTHING you bolt on is going to do much better.
Most of the benifit of the BNR's comes from running higher boost since the twins aren't efficient past 14 PSi (or very reliable if your beating on them). Running non-sequential can have at most a 5-10% difference in HP. And yes, I'm still running sequential. If your gonna get BNR's and run them non-sequential I really don't see a point. Might as well get a small single like the GT35R or similiar.
thewird
thewird
09-07-08 | 09:11 PM
#27
I wouldn't run ANY sequential twins at anything higher than 15 psi on pump gas.
That said, I made 365@15 psi on a small streetport w/ 99's. They've been reliable for years at that boost. Rynberg made the same w/ BNRs at the same boost and similar setup. The most I've heard of sequential twins making, even with the most breathed-out set-up (mine is nothing special) is maybe 10 hp more.
The point is, it doesn't matter what you bolt onto the stock sequential manifold after a certain point, it's the bottleneck. I think Mazda knew that, and so they didn't try to make the turbos bigger, just more efficient and fast-spooling at the same peak power.
So Saying "I bolted them on and only got 7 hp, so they're a rip" as some have, misses the point. NOTHING you bolt on is going to do much better.
That said, I made 365@15 psi on a small streetport w/ 99's. They've been reliable for years at that boost. Rynberg made the same w/ BNRs at the same boost and similar setup. The most I've heard of sequential twins making, even with the most breathed-out set-up (mine is nothing special) is maybe 10 hp more.
The point is, it doesn't matter what you bolt onto the stock sequential manifold after a certain point, it's the bottleneck. I think Mazda knew that, and so they didn't try to make the turbos bigger, just more efficient and fast-spooling at the same peak power.
So Saying "I bolted them on and only got 7 hp, so they're a rip" as some have, misses the point. NOTHING you bolt on is going to do much better.
I run 17 PSi all day long almost every weekend at the track on pump 94 Sunoco. If your running a safe AFR and your timing is relatively safe as well its fine.
thewird
09-07-08 | 10:45 PM
#28
Banned. I got OWNED!!!
Joined: Jul 2008
Posts: 529
Likes: 0
From: NC
IThe point is, it doesn't matter what you bolt onto the stock sequential manifold after a certain point, it's the bottleneck. I think Mazda knew that, and so they didn't try to make the turbos bigger, just more efficient and fast-spooling at the same peak power.
So Saying "I bolted them on and only got 7 hp, so they're a rip" as some have, misses the point. NOTHING you bolt on is going to do much better.
So Saying "I bolted them on and only got 7 hp, so they're a rip" as some have, misses the point. NOTHING you bolt on is going to do much better.
09-07-08 | 10:47 PM
#29
Banned. I got OWNED!!!
Joined: Jul 2008
Posts: 529
Likes: 0
From: NC
09-07-08 | 10:54 PM
#30
10.9-11.1 @ 17 PSi depending on the car. When your pushing your fuel that far, you need an EGT gauge and tune using that. I have ran 11.5 AFR and didn't blow up but EGT's weren't safe at that point (but I didn't blow up there). I only blew the motor when I pushed to 12 AFR but it did last a good 5 laps at Mosport and oh was the power nice. At least I found the limit which is what I sortof wanted cause I wanted to re-port the motor and use ceramic seals 
.
Also note, I use Sunoco 94 fuel which the times I went to the states, I could never find so maybe I can push mine a tad further.
edit: tomorrow, I'm gonna drop by to see how my engine build is coming along ^_^
thewird
.Also note, I use Sunoco 94 fuel which the times I went to the states, I could never find so maybe I can push mine a tad further.
edit: tomorrow, I'm gonna drop by to see how my engine build is coming along ^_^
thewird
Last edited by thewird; 09-07-08 at 11:07 PM.
09-07-08 | 11:11 PM
#32
Banned. I got OWNED!!!
Joined: Jul 2008
Posts: 529
Likes: 0
From: NC
09-07-08 | 11:30 PM
#33
09-08-08 | 08:52 AM
#39
What sort of power did you make @ 17 psi and 10.9-11.1 AFR?
10.9-11.1 @ 17 PSi depending on the car. When your pushing your fuel that far, you need an EGT gauge and tune using that. I have ran 11.5 AFR and didn't blow up but EGT's weren't safe at that point (but I didn't blow up there). I only blew the motor when I pushed to 12 AFR but it did last a good 5 laps at Mosport and oh was the power nice. At least I found the limit which is what I sortof wanted cause I wanted to re-port the motor and use ceramic seals .
Also note, I use Sunoco 94 fuel which the times I went to the states, I could never find so maybe I can push mine a tad further.
edit: tomorrow, I'm gonna drop by to see how my engine build is coming along ^_^
thewird
.Also note, I use Sunoco 94 fuel which the times I went to the states, I could never find so maybe I can push mine a tad further.
edit: tomorrow, I'm gonna drop by to see how my engine build is coming along ^_^
thewird
09-09-08 | 11:44 AM
#41
i run 93 octane u realy not supostu use anything less especially now that a lot of gas is f water...
and map sensor is not acuret pas 15psi u can push it ,not good tho....and i run rich all the time
idk what to use any more all this talk is making me go nut is there any thing like perfect setup.....see i f@$#%^* hate turbo lag u know
thats y am lining to sequential BNR
but i all ready got a T66 single i think it be lil too much for a street car and stock transmision and rear end
and map sensor is not acuret pas 15psi u can push it ,not good tho....and i run rich all the time
idk what to use any more all this talk is making me go nut is there any thing like perfect setup.....see i f@$#%^* hate turbo lag u know
thats y am lining to sequential BNR
but i all ready got a T66 single i think it be lil too much for a street car and stock transmision and rear end
Not every state has 93 Octane available. If you hate lag, stay sequential. Yes, the BNR are the better choice over the Efini.
If you don't want to think about it, just fork over the cash to a good rotary shop and have them set the car up properly on BNRs.
09-09-08 | 02:06 PM
#42
As other said earlier on the thread - SEARCH. Topic has been beaten to death in a new thread every 6 months for the last 5 years. Neither the 99 twins or the BNR twins have changed since the last thread.
If you want to run high boost and make big power - get the BNRs.
If you are happy running 10-15 PSI with quick spool and good torque and midrange - the 99 twins are a great choice also.
My car has dyno'ed 350 rwhp on a streetport + 99 twins at ~15 PSI with mediocre tuning and 93 octane. It also dyno'ed 330-ish rwhp at 12-13 rwhp and 93 with a better map but not fully tuned. It most recently dyno'ed 310 rwhp and 240 rwtq at 10 PSI with 91 octane Cali gas and Steve Kan tuning. Full boost comes on at 2500 with my Vmount setup which is 500-700 rpm sooner than with the Greddy FMIC.
If you want to run high boost and make big power - get the BNRs.
If you are happy running 10-15 PSI with quick spool and good torque and midrange - the 99 twins are a great choice also.
My car has dyno'ed 350 rwhp on a streetport + 99 twins at ~15 PSI with mediocre tuning and 93 octane. It also dyno'ed 330-ish rwhp at 12-13 rwhp and 93 with a better map but not fully tuned. It most recently dyno'ed 310 rwhp and 240 rwtq at 10 PSI with 91 octane Cali gas and Steve Kan tuning. Full boost comes on at 2500 with my Vmount setup which is 500-700 rpm sooner than with the Greddy FMIC.
09-14-08 | 09:28 PM
#44
any one got this for sale
BNR Stage 3 Turbo or Efini Twin Turbos
mine r almost shot
liking oil not boosting as they should
don't wanna go single turbo
or any upgrade parts
map sensor
ECU fc commander
ignition
injectors ......other....just let me know
properly working stuff only that u dont need
BNR Stage 3 Turbo or Efini Twin Turbos
mine r almost shot
liking oil not boosting as they should
don't wanna go single turbo
or any upgrade parts
map sensor
ECU fc commander
ignition
injectors ......other....just let me know
properly working stuff only that u dont need
Last edited by serbRX7; 09-14-08 at 09:31 PM.
