pros and cons of bnr turbos
#26
Engine, Not Motor
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I wouldn't stick a S4 based turbo on anything by choice.
Well came across this thread. Trying to get my car to pass emissions legally. I have a fully built TO4B 60-1 turbo and can not bear to think of driving a stock powered FC. So I bought a new harness and have a brand new stock Cat converter to install. I was going to try to run everything stock emissions wise with a P1000 ECU with a patch harness or Rtek with my big turbo or a Stage 4 BNR. I've read a few times of boost control issue with BNR. Now I'm not so sure what to do.
I don't think there is a proper turbo manifold out there that fits a single turbo with full emissions including air pump.
I don't think there is a proper turbo manifold out there that fits a single turbo with full emissions including air pump.
Rising RPM
keeping the 7 psi rated stock can and trying to control it with a boost bleed
( even with electronic solenoid control )
is always going to end up at some point where delivery down the pipe to the can will defeat the amount being bled and you end up with a bell shaped boost curve as it falls back to the spring rating
( even with electronic solenoid control )
is always going to end up at some point where delivery down the pipe to the can will defeat the amount being bled and you end up with a bell shaped boost curve as it falls back to the spring rating
adding a helper spring is in no way dodgy.. isnt cheating anything .. and is in fact the most correct mechanical correction for the task
its also bloody easy to do// i have one on mine.. have done for years . and i have the HKS adjustable arm can
its also bloody easy to do// i have one on mine.. have done for years . and i have the HKS adjustable arm can
The unfortunate part of the whole thing is that the "easy bolt on" turbo upgrade has become more of a hassle than a full upgrade would have been. Time wise, we could have made a simple manifold for an internally gated 3076R.
#27
Same problem, even tho i asked for 12psi.
How many lbs for the helper spring to achieve 12 or 15 psi?
If anyone doesnt need his helper spring anymore I would gladly buy it off of you if you are willing to send it to Italy
Thanks in advance
How many lbs for the helper spring to achieve 12 or 15 psi?
If anyone doesnt need his helper spring anymore I would gladly buy it off of you if you are willing to send it to Italy
Thanks in advance
#28
Engine, Not Motor
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I don't recall the specs of the helper spring, unfortunately. We just tried springs until we found one that would do the job.
While the spring works initially I'd suggest just getting a double diaphragm wastegate actuator or one designed for high pressure with a 12 PSI or so spring (ATP turbo carries them for under $100). These turbos need to be around 15 PSI to see their efficiency.
While the spring works initially I'd suggest just getting a double diaphragm wastegate actuator or one designed for high pressure with a 12 PSI or so spring (ATP turbo carries them for under $100). These turbos need to be around 15 PSI to see their efficiency.
#30
Rotary Enthusiast
iTrader: (23)
Been running but stage 3 with Profec b spec 2. No problem maintaining boost. Slightly lagging than stock turbo, but power gains were immense.
Easy enough and they go for cheap enough on this forum...
Change your mind and resell it for the same price you paid used for it. Then upgrade to a gtx
Easy enough and they go for cheap enough on this forum...
Change your mind and resell it for the same price you paid used for it. Then upgrade to a gtx
#31
RX-7 Old Timer
For me, Bryan agreed to bolt up a Turbonetics dual port actuator (part 30326), which I sent him with my core. It required some welding because when he bent the rod, it snapped.
The dual port actuator is letting me run an AMS-500 controller, which applies pressure to the opposing port. It is a stronger wastegate spring on-demand. Overall, it is working well, and I like the BNR.
My boost curve still looks like this, with a distinct drop off. I am fighting the stock intake, AFM, snorkel, TMIC, and stock catback. I'm also using a TA-34 turbine, which might matter. Most folks get more than 7 PSI near redline.
The dual port actuator is letting me run an AMS-500 controller, which applies pressure to the opposing port. It is a stronger wastegate spring on-demand. Overall, it is working well, and I like the BNR.
My boost curve still looks like this, with a distinct drop off. I am fighting the stock intake, AFM, snorkel, TMIC, and stock catback. I'm also using a TA-34 turbine, which might matter. Most folks get more than 7 PSI near redline.
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