well call me stupid, but I want to keep the car in sequential, i mostly track it but do some driving. When it came time buy a new setup, it seems a good investment to get the BNRs, not to mention that they can come w/ ball bearing for a "measly" $700 more.

I have a couple of weeks yet to see them but all around performance on pump gas is what i am looking for. My brother races 'spec miata' and that damn $8,000 car on race tires hangs w/ a 7 in the corners but the HP comes to play every where else, so... For me it is good track lines, good acceleration and when i can do it, late braking.

 

What ecu were you using and was it with a 3 bar map sensor?

Tim

 

Pretty sure he uses a Power FC. At that level I would expect a GM 3 bar.

 

It was on dynojet.
Looking at my dyno logs from that day...
Max boost = 1.14kg/cm2
Inj duty = 92 % ( 4 x 850cc inj & walbro 255hp)
water temp= 86 C
air temp = 36 C
A/F= 10.90, 11.0, 10.8 across

1.14kg/cm2= 16.2 psi as per commander but my boost gauge indicated 17.5psi which is also almost max for the oem map sensor.

Thanks.... stock twins offer a nice power curve:
@ 4.5krpm= ~ 290rwh
@ 5.0krpm= ~ 330
@ 5.5krpm= ~ 370
@ 6.0krpm= ~ 390
@ 6.5krpm= ~ 398
@ 7.0krpm= ~ 400

 

Hehe.....had same problem....PowerFC will not control over 15psi unless you sart messing w/ pills in W/G signal hose or simply add a boost controller.

JD

 

Power FC w/ datalogit and Apexi 3 bar map sensor.
I did run the oem map sensor when I was running 17psi max.
It maxes out @ 17.5psi or 1.15kg/cm2 on the commander.

JD

 

Just to throw out another data point, I foolishly popped two (two!) motors by running the stock map sensor right at the ragged edge of 1.15. Anyone wanting to run more than 15ish psi in my opinion should buy and install the gm 3 bar map sensor, it's inexpensive and a fairly easy install.

 

Hello JD.

Alright, so your car made 402RWHP and trapped 125. Stephens (SPOautos) car trapped 125 with a full tank of gas while granny shifting it one single pass... That was with a set up that made 20 less RWHP than the new design. He didn't even lauch the car hard either. I was filming it at the time he made the pass. We drove in, entered the burn out box, I got out with camera in hand and made one pass. Just one. Not 140 hehehe. He got around to picking me up and we left the premisis.

I am not telling others that your car didn't put down good numbers. Your car is tuned very well and you have more capabilities than the average Joe that doesn't have the knowhow. If you really want more numbers out of twins, I am about to let the cat out of the bag!! Better spool and more powah!

Bryan@BNR

 

????? 17psi on pump gas on most singles should place you @ ~450+ rwh !!!
How's 482rwh on a T67 @ 17-18psi on pump gas ????

As long as your're happy with your choice of turbo is what matters and good luck with the dual BB BNRs.

JD

 

Hey JD.

So was going single worth 2 tenths over twins? hehehe just messing with ya.

 

That's some pretty good power out of that T67, damn. might be the most I have heard of on 93 octane. Are you running water injection at that boost level? What kinda traps are you seeing out of that? most impressive peak power, big kudos to you. I assume lots of tuning went into that. I have driven a few T67 cars and while they were pretty laggy, once the boost hit the car moved. If going back to sequential wasn't such a pain in the ***, I would consider running the dual bb BNRs sequentially, I think that would be the ultimate street setup.....

 

I hope you did something about the oem manifold and turbine housings.....I have only been telling you about their limits for almost 3 years.
I told you then that ~430 rwh would be the limit on the BNRs so I hope you prove me wrong this time around.
You have put alot of effort into improving these twin-turbos so I hope your ideas come thru.

Later,
JD

 

Hahaha....quite satisfied with the 10.8 @ 130 on drag radials and pump gas....
You know how it goes......more power less traction :-)

 

Nah, there's been others that have been higher on pump, I believe.
No water injection.
Lately been running a T70 @ 20psi which has seen 130.8mph on pump gas.....~500rwh or very close.

The only issue with the seq system is keeping up with a faster revving motor after 15psi.

JD

 

how does torque output compare on average between the BNR twins and single?

 

do tell brian.. im in need of a set soon... the stockers are smokin pretty badly..

 

so ya'll are running the gm map sensor on the fc....how do you set that up on the fc....also where can i get another actuator....mine is gone...air passes right through

 

If you search, there is a thread with install instructions, try 'gm 3 bar map sensor install.'

which actuator are you referring to? wastegate/precontrol? Never heard of one failing, I am sure if you post in the 'fs section' there are many floating around out there.

 

that kind of boost on 93 octane is hard to believe

100 pump gas I believe

 

Or maybe they bought them because they are cheaper than buying new stock ones :-)

 

don't mind me, just popping in to be pedantic....

efini ended in 97.
upgraded turbos started in dec 98.

let's get the terminology straight before the kids start crying about the 'fake efini turbos' they bought on ebay

 

GOodFellaFD3S damn 11,275 posts..

 

GOodFellaFD3S damn 11,275 posts..

yeah i think he might know alittle bit about what he is talking about. lol

i liked reading this disscussion but when it comes time to buy a new setup for my car i think i'll go with the BNR with the Ball Bearings. it just seems like a great choice for a street car. i'm not looking for a 500-600whp super FD just enough to woop up on 90% of the cars in my area.

 

if I had it to do over again I'd probably look at half bridge with a single turbo, but there may be some downsides to reliability and gas mileage (of course it stinks anyway), who knows

 

ballbearings in BNRs? Is this true? I've researched BNRs quite a few times now but I didnt think they were Dual BB? Is this new?