I think this is the key to being happy with BNRs (or twins in general)... Keep them sequential.

 

I can second that. I had them sequential and then non and seq is 100% the way to go. Sure it's more complicated but the low end power is just awesome.

If you want non sequential go single. You can also push them MUCH higher that the stockers due to the 360* bearing. It's fuel and knock that will stop you with the bnr's.

 

Any one have dyno chart for BNR sequential at 16-18 psi ?

 

^^x2

What is the max hp and psi BNR's have ran in SEQUENTIAL form????????

 

How close? Did you try and pass with a power FC ?

 

With the 850's in the primary the HC's were about 100ppm or so too high, CO was .27%-->.57% (ok to slightly rich), NOx was okay. Used a stock ECU in O2 feedback. Did not try a PFC.

Switching to the 550's cleaned up the HC's without further ado. With some fiddling, it may be possible to get 850's to pass; with a really good, hot cat, plenty of AIR and maybe leaning the mixture just a bit to bring the CO down slightly. This assumes that everything else is up to par.

 

I spoke with Brian at BNR and if I remember correctly he said that with the BNRs stage 3s running sequential, the most (legitimate) he has heard of was 412 rwhp at 18-19 psi. I forgot what dyno he said it was on.

Once I dyno my car w/ the BNRs stage 3 s and a very large street port plus all the supporting mods I will post my results. I am shooting for hopefully 400 rwhp, possibly a little over depending on if fuel will limit me.

 

I was seeing 440 to 450 on a G-tech I borrowed. That is with the older style BNR-3's in sequential at about 17-->18# boost.

The motor has a Pineapple large street port and fuel was just about at the limit with 850/1300's + a supra pump. I also run water injection as a precaution.

The turbine scrolls and exhaust manifold have been ported and received flow bench work. The result seems to be pretty good. I have not attempted to run higher boost to date due to the limitation of the stock 2 bar map sensor.

The car is my primary DD and this has proved to be a potent, reliable and very fun combination. Hard to beat the right-now response of the sequential for spirited daily driving. Now I really need to turn my attention to larger/better tires to hook it up.

 

At what psi will you need to upgrade your primary injectors when running the bnr's sequentially?? I'm about to upgrade to these turbos with a streetport and I'm trying to figure out if the secondaries are the only ones that need to be upgraded...

 

speed of light, IIRC the stock map sensor maxes out around 16.2 psi, i dont see how you can be running those boost levels with the oem unit.

 

I had 550/1300/rewired supra pump and was pretty much out of fuel. I think around 17psi you need to go larger or add meth to compensate.

 

I ran 550s and 1680s with a supra pump (rewired but not the best way to do it for max voltage to the pump), and only 36 psi base fp, and was seeing max inj duty cycle of 96 at 6400rpm with max boost about 21 psi (24455 pim) then falling off to 17-18psi with the stock turbos non seq. dynoed at 411. Your base fuel pressure makes a difference, you can turn it up a little and retune to lower your inj. duty cycle, I should have ran more base fp at the time, recently turned it up to 40 for my single. Also your tune if it's rich makes a big difference in idc.

 

Thanks, I may have to go up!

 

Rich,

This particular map sensor tests good to about 17.5# vs. lab grade instrumentation. I've checked it several times and it's remained stable over several years. Beyond that, it obviously can't add fuel; however, I've used an external gauge with peak hold to set, determine and monitor max boost. Boost creep hasn't been a problem for me and with water injection and a J & S, I haven't worried about it too much. Of course, I'm tempted to install a 3 Bar and further increase the boost; not sure how much that would be worth, however, running the 91 pump here may just be pushing my luck. After all, this is my daily ride....

There may be a significant variation on the production map sensors as to their max reading or calibration; I've only tested a couple of them under controlled conditions--and they were similar. This being at sea level.

Joe

 

If you really wanted to run another 2-3 psi of boost, just add 2.5 to all the cells across p19 22000pim in the base map (if you have datalogit and wideband dataloging) and turn up your boost slowly until you get your desired afr with a safety margin, it will be really rich until the boost is turned up enough. Especially if you have a electronic boost controller with a boost warning/limiter feature so you can set that to 19 or 20 psi so you won't overboost. I know this isn't a good way to do it haha, and it's much better to get a 3 bar map sensor (I got the apexi plug and play 3 bar), but just saying.. I think I actually did a little bit of this before getting the 3 bar map sensor. With the stock sensor if I remember correctly it would go to p19 with 17-18 psi being the most it would read. If you have wi and the conservative base pfc leading timing map and 12-14 split you should be okay. I can guarantee you that you will feel the extra power from that 2-3 extra psi, preferably in colder weather.

 

I'm currently running non-sequential BNR's at 18.5 psi. I'm going to push these turbos to the limit this weekend and then get the car dynoed in a week to see how much power it makes. I'll report back with the results when I get off the dyno.

 

Are you running 18 lbs on Cali. 91 octane with water inj.?

 

Yes. I would not attempt that level of boost on pump without water.

 

I asked because usually most still mix 100 octane with 91 and then spray H20.

 

I thought some people might want to see a dyno of these Turbos running sequential. My CYM is running 50/50 water/meth @ 1.35 Bar & 93 octane. I guess we could have run some race gas for more power but this was good enough. My brother Chris built the motor & spent considerable effort & time building a strong sequential car (good job & thanks Mr. RX-7 TT ;o)

The car pulled 432 rwhp but it was on a different pull - this one is close enough. Cheers.

-Matt

 

amazing numbers, you should start a build thread.

 

YES FINALLY a sequential build with BNR's I will be going for 400 rwhp and now I have proof that it's possilbe!
This may be my favorite CYM EVER!

I 2nd this motion!

 

How much boost on the primary turbo?

 

My exact plan and thoughts too, I think the BNR's will easily do over 400 in sequential, and I mean, who needs more power then that with that kind of torque curve...? Lol

I have the first gen BNR's so I might not hit over 400, but I'll get close...


J.

 

1.3 Bar or about 18.2 lbs.....and the boost/pills have been configured for instant spool - there is NO lag....the response is better than the stockers (about the same as th Efini's but they pull much harder). I got rid of the new Efini's I bought as they sacrificed too much top end power....these BNRs are rockin'.....I can up the boost a bit more if I choose to run higher octane - there is still plenty of turbo - at 8,300 they still pull like a freight train (according to my Brother - it pulls down low like a V8.....I'll see it in ~ 3 wks when I ship it back to Cali). Pretty cool - it is a perfect sequential set up IMO - thanks again to Mr. RX7 TT for a great build).

-Matt