BNR discontinued the Stage 3, introduced an alternative
Senior Member
Joined: Oct 2006
Posts: 440
Likes: 339
From: SoCal
Great numbers and to see nearly 250lb-ft of torque at 3,250rpm really shows the response of ths twin setup. However pulls like this drive me nuts when Dyno operators don't start the pull in the low 2,000rpm range. It's difficult to tell if you'd hit 200lb-ft (at 14psi) at 2,500rpm, or 2,200rpm when it was ramping up and hit 200lb-ft at what appears to be 2,900rpm.
Joined: Aug 2001
Posts: 3,835
Likes: 494
From: Stockton, CA
Great numbers and to see nearly 250lb-ft of torque at 3,250rpm really shows the response of ths twin setup. However pulls like this drive me nuts when Dyno operators don't start the pull in the low 2,000rpm range. It's difficult to tell if you'd hit 200lb-ft (at 14psi) at 2,500rpm, or 2,200rpm when it was ramping up and hit 200lb-ft at what appears to be 2,900rpm.
I don't think my set-up will be a good representation of the potential initial spool time of the twins as I have some things that will affect the response.
I have a tired hurt motor 75/80 psi all 6 faces.
Ported exhaust ports, stock intake ports.
Running a Big IC vm kit.
Running a Cat.
Working A/C !!!!!!
But with that being said the BNR stage 1's still gave some good results.
The tune was a quick last minute thing after sevenstock just to get some numbers. Daniel Kuo is a great tuner but this dyno session was not to have an intensive tune - it was just to strap it down and see what it makes.
The car feels strong since there is a good power under the curve - it just has a solid pull to the buzzer .. lol
Although a have a new motor setting ready to go in, Im super tempted to just refresh the ported motor with some new coolant seals, put on a mid-pipe, and up it to 15ish psi.
I bought the motor used and all I know is the motor was built by renown, has oil mods inside, ported exhaust, no omp, and running 1.25:1 Lucas marine TC-W3 synthetic premix.
Im happy BNR has the parts coming in, soon we'll have more people reporting on their set-ups.
Last edited by rotaryextreme; Jan 12, 2023 at 04:34 PM.
Rotary Enthusiast
Joined: May 2018
Posts: 1,473
Likes: 262
From: South FL
I don't think my set-up will be a good representation of the potential of the twins as I have some things that will affect the response. I have a tired hurt motor 75/80 psi all 6 faces.Ported exhaust ports, stock intake ports.Running a Big IC vm kit.Running a Cat. But with that being said the BNR stage 1's still gave some good results. The tune was a quick last minute thing after sevenstock just to get some numbers. Daniel Kuo is a great tuner but this dyno session was not to have an intensive tune - it was just to strap it down and see what it makes. The car feels strong since there is a good power under the curve - it just has a solid pull to the buzzer .. lol Although a have a new motor setting ready to go in, Im super tempted to just refresh the ported motor with some new coolant seals, put on a mid-pipe, and up it to 15ish psi. I bought the motor used and all I know is the motor was built by renown, has oil mods inside, ported exhaust, no omp, and running 1.25:1 Lucas marine TC-W3 synthetic premix. Im happy BNR has the parts coming in, soon we'll have more people reporting on their set-ups.
Joined: Aug 2001
Posts: 3,835
Likes: 494
From: Stockton, CA
The wastegate can handle it on the BNR correct? My 3KAI are coming off for a leak and I may have to port it a bit as ultimately I would love to run my midpipe. I still think it will creep and spike right now. Running off the wastegate on the 3KAI is about 9psi I believe vs the 7 or 8 on the stockers.
I ended up putting a rounded edge on the flapper door and the port to prevent catching, the door did not fully close a few times when performing cycle checks until I did that.
https://www.rx7club.com/build-thread.../#post12398945
With the boost controller off I did see some creep from 7 to 9psi once.
With the boost controller on it was solid at 12 and 14psi. Old school Greddy profec B.
I have the simplified twin vac setup to control 2 actuators I think. I'll look for my previous post in my build thread.
I wonder if thats why I can hear the second turbo spool up around 4.5k rpm revving in idle.
My vacuum set-up - i think the current one. cant see pics at work.
https://www.rx7club.com/build-thread.../#post12431900
Last edited by rotaryextreme; Jan 12, 2023 at 04:31 PM.
Newbie
Joined: Oct 2017
Posts: 4
Likes: 0
From: Italy
Hello,
im currently rebuilding my FD engine and i would like to upgrade some parts in the process. So i am very interested in these BNR stage 2 turbos. But i cant seem to contact them, i emailed them like 3-4 time, but still no answer.
Are the still in the business? Holidays?
thank you
im currently rebuilding my FD engine and i would like to upgrade some parts in the process. So i am very interested in these BNR stage 2 turbos. But i cant seem to contact them, i emailed them like 3-4 time, but still no answer.
Are the still in the business? Holidays?
thank you
Junior Member
Joined: Jan 2014
Posts: 35
Likes: 1
From: Cheyenne WY
It seems risky, I probably wouldn't do it just due to the amount of heat that's being dumped into the chamber it can cause all sorts of issues. Chatting with my tuner about goals, and some other folks who have been running rotary tuning shops for a long time anything more than 16lbs on twins (BNR or other) should be using water or meth at least with E85 preferred for safer power and temps cooler.
EGT wise I plan to drill the top of the exhaust manifold and put two Stainless tap in bungs for the front/rear EGT sensors. I've done similar things on Diesel exhaust manifolds. Takes a press and some good bits, run slowly with cutting oil but it can get through. I'll take pictures when the kit gets here. That'll be hooked up to a TCA2 for the haltech. For the EMAP i'm using a FFE emap canister, a stainless steel cooling tube and I plan to use the port air passages in the center iron/lower intake manifold to capture exhaust pressure.
EGT wise I plan to drill the top of the exhaust manifold and put two Stainless tap in bungs for the front/rear EGT sensors. I've done similar things on Diesel exhaust manifolds. Takes a press and some good bits, run slowly with cutting oil but it can get through. I'll take pictures when the kit gets here. That'll be hooked up to a TCA2 for the haltech. For the EMAP i'm using a FFE emap canister, a stainless steel cooling tube and I plan to use the port air passages in the center iron/lower intake manifold to capture exhaust pressure.
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