A customer did a log with the stage 4. It peeked at 18 psi and dropped down to 15 psi from 6-8k and made 403 uncorrected RWHP. IT averaged about 400 RWHP from 6-8K RPM. It was maxed out .

The stage 4's are available in S4 and S5 applications. The S5 will not make as much peak power as the S4, but the response is a bit better with the devided manifold and turbine housing. I have not got a 400 RWHP dyno sheet with the S5, but I can emagine it will get very close if the car is tuned right.

Bryan@BNR
205 640 1193

 

What hotside and compressor side A/R does the stage 4 have?

 

thanks! that thing came factory with the tII's in europe! try to find out through your mazda dealer, maybe he can order it!

 

So there is better response feel and quicker spool with the Stage 4 on the S5, but so far you have not seen actual proof of the S5 yielding the 400rwhp? The Stage 4 on the S4 has put down those #'s in the 400rwhpp area with proper tuning, but is that using the twin scroll setup or with it twin scroll set up forced open all the time (welded or some sort)? I to am looking for the best results for my S4 10th AE and this gentleman is for his Vert. What is the differences mainly between the Stage 2, 3, and 4 BNR Hybrid Turbos that you do? I saw that there is porting done to the housings, but is there anything else that allows the Stage 4 to make the 18psi while the Stage 2 is making only 15psi? How low does the Stage 4 make the 18psi for until it backs down to 15psi? I would assume the setup would make the 400rwhp area before the psi backs off correct?

Sorry for the thread jack, but just trying to get answers for other people as well as myself that might want this info...

 

www.bnrturbos.com most of the info you need is there. And you would get a faster reply with an email I would imagine

 

damnit your car's so cleannnnnnnnn!!!!!!!

You've convinved me to get a T-II hood also.

 

thanks man!
the verts came only TII in Europe!! it's an amazing combination...

 

Very Clean and Nice.

What type of shifter is that?

Aaron

 

depends on the motor, setup and tune. every car is different.

as for boost and power from the turbo, the compressor wheel states most of that.
the turbine wheel changes the spoolup and rpm range of the turbo. make it come on earlier and die off before redline or come on later and go all the way to redline.

I think bryan fiddles w/ the bearings to make them able to take higher psi's and stuff like that.

 

it's a RX-8 shifter ****! f*cking expensive...

 

The Problem with 1600cc's secondaries and an S-AFC is that it corrects from a stock size injector in Percentage. So it'll be difficult to go at it smoothly with that size increase. I think you'd get smoother results going like 850 on all 4's maybe. With the way you want it, the secondaries will kick when they come in.

 

Hey guys.

Call me sometime and we can talk it over. I'll explain what benifits to each upgrade is and whats suitable for your application. I would be here forever typing making an explaination .

Bryan@BNR
205 640 1193

 

you're right, but with 4 times 850's i'm going to have problems with idle and low load driving, 'cause that thing is going to run much too rich under no load!

 

have to bring this thread back guys! you were talking about retarding the ignition timing, i'm wondering why would that help?? i thought usually you advance timing on tuned engines...?? am i completely wrong

 

no, on a tuned, boosted engine you want to retard the ignition timing to keep from detonating. The much higher pressures and temperatures make the fuel and air want to burn much more quickly than the engine and computer are used to, so sparking at the normal time could cause the fuel to burn before our engine's equivalent of TDC, causing a lot of damage. Plus, the hotter, higher pressure conditions make the engine more prone to knocking, and by firing later in the cycle, heat is reduced slightly (at the expense of power), but you're less likely to blow your engine. Ways around this are running higher octane fuel (or a secondary injection system to increase octane... methanol or ethanol), or water injection which cools the intake charge. Both of these will reduce the possibility of detonation.

But yea, simple answer is on a turbo engine with a lot of boost, you need to retard the timing under boost or you go "POP"

 

When I finish building my turbo motor, I plan on using a big-*** air-to-water intercooler and using the spark and fuel tables on my Megasquirt to keep detonation in check. I am currently building my own hybrid using a stock S5 turbine with a Garrett T-04 compressor housing and wheel (.60 a/r cold side). No AFM or boost sensor to worry about. GO MEGASQUIRT!...also when I take it to the track I can add ice to the intercooler reservoir to keep the intake temps way down.

 

wow thanks guys that was clear enough! maybe i'll retard timing some degrees at the CAS, hoping it will not affect low throttle or rpm performance!

 

Backing off the timing at the cas can help with detonation but it also can cause sluggish low-rpm power when not under boost, so be prepared for that.

 

Hate to bring this back but there are people on this forum who run BNR stage three with 550/720 set up and if you go with RTek2.0 for like $400 you can program for those injectors with the check of a box... not to mention tune fuel and ignition via PalmPilot. I'm going to go in that direction within the year just thought I'd throw that out there incase you're still open for ideas. Good luck and sweet car man!!!

 

Nevermind.. forgot you had S5.. Shut myself up haha!

 

no problem

i'm going with four 800cc injectors! just got them from SARD!

that should work quite well!!

 

I think you're gonna blow your motor within half a year

Get a standalone. You spent way more than a standalone on those mods. Keep saving and get one already!
-Ben Martin

 

yes thanks for the advice! .... but i'm sticking with my stock ECU

think it can handle 15psi with BNR II and the supporting mods...

standalone will be next step (one or two years)...

 

what kind of steering wheel is that???

 

Thats odd. I've seen people run safc and aic all day long . You can have a standalone and blow the motor.