Anyone Know Whats The Maximum Safe Boost Output The 99 Spec Turbos Can Put Out.... Im Looking To Keep The Sequential Setup But Run Fairly High Hp Numbers...
Thank You

 

They aren't really an upgrade (power-wise) from the stock '93-'95 turbos so basically the same boost levels apply.

 

http://www.bnrturbos.com/3rdGen.htm

and see the dyno video in my sig.

 

15 psi is the practical limit, although life will be shortened as compared to the 10-11 psi they are designed to run

 

Wow The Bnr Turbos Sound Nice.... Do They Need Me To Send Them A 99spec Core Or Just My 93 Twins?

 

From the site: $2350 with rebuildable core

If your 93 twins are rebuildable, then yes you send them your turbos.

 

With High Boost Numbers On The Twins How Can You Control The Spike When Running Them Sequential? I Watched Your Dynoe Video. Are You Runnin Them Non Sequential?

 

How can one determine if core rebuildable?

 

The main thing to examine is the turbo manifold. If its full of deep cracks then it's probably not usable. Anything else would probably need to be determined by Bryan at BNR.

 

And how much BNR will charge if you don't have rebuildable core?

 

You need to ask him.

 

I was running them non-seq. If you like your low end (3k to 4k) power, I suggest you keep them seq.

 

Goodfellas, how would u compare the BNRs with ur 500r??

 

i was able to squeeze out 330 whp at 14 psi with a stock ported motor on my 99 twins.

 

i still dont understand how i would control the spike if i were to run these bnr turbos sequential... do i have to keep the factory cat on to give it the backpressure it needs? i know once you run a strait exhaust o the factory twins it spikes when the second turbo engages.....

 

Just curiously, has anyone actually made any more power sequentially with BNR's or any other upgrade turbos at pump gas levels (15 psi)? I always hear "get BNR's they'll make more power", but I've never seen it unless it's non-sequential, a big lumpy port, 18 psi, etc. The better sequential systems make 365-385 rwhp, depending on setup.

I think the manifold is the limitation, and after a certain point, bigger turbos bolted to it will just spool slower.

 

Granted I ran them non-seq---I made 350 at 12 psi, and 390ish at 15 psi. Stock twins won't do that for you.

A while back someone collected a bunch of stock twin dyno sheets and added a few of mine in, and plotted them all. My BNRs were head and shoulders above every stock twin dyno on the list.

 

If Ran Sequential At High Boost Levels Will The Bnr's Spike When The 2nd Turbo Engages? I KNOW THERE IS A PRE-SPOOL THAT CAUSES THE SECOND TURBO TO SPIKE IN THE MIDDLE OF THE TRANSITION....

 

Peter, IMO, they do not really make much more power than stock twins until after 14-15 psi (Rich's freak car aside ). However, they should be much more reliable running 15+ psi. And you can run race gas or water injection and run 17 psi and actually make power instead of just more heat.

 

With today's good boost controllers and tuning, you can run pretty high boost in sequential and have a pretty smooth transition. I do not have any spiking problems at 15 psi.

 

Will Keeping The Factory Cat Help Or Porting The Wastegate Help..... Or Does It Not Even Matter With The Bnr Turbos? When Running Sequential.

 

^^^^^

Dude, I run '99's with an open exhaust and no spiking.

Porting the wastegate is for OE twins....

 

That's essentially what I'm saying. Running sequentially on pump gas (in otherwords, 15 psi max) without any tricks (like water injection, aggressive ports, etc.), BNR's aren't really going to make any more than 99's... both of which are a bit better than OE's.

 

sorry man.. but ur wrong. 99 specs are just improved OE. same turbo size, just slight change in the compressor housing and y-pipe. but its got the same limitations as OEM turbos

BNRs on the other hand, only uses the stock exhaust side housing for both turbos, but the compressor, fin, and overall size and length is bigger and longer than stock. which is why the Y-pipe needs to be customized and extended.

BNRs are largest aftermarket turbos that look stockish. and its supportive component requirements are not that much different than a single turbo.. like complete fuel setup, ignition, different spark plugs...etc..

 

Wrong about what exactly?

Where's your dyno showing BNR's making big HP sequentially at 15 psi (pump gas level) with a regular streetport and usual bolt ons?

I'm not saying there's anything wrong w/ BNR turbos, and they obviously work well on a non-sequential, big port, higher-than-pump-gass-levels-of-boost set up like Rich's, but bolted to a regular port, sequentially, and at pump gas levels, I don't see the big advantage, that's all. Having 99's myself, and being a former non-believer, they seem to be sized perfectly... enough to produce as much top-end as anyone will with the sequential manifold on pump gas, but with fabulous spool and torque.