Not sure. i was thinking I heard that the AFM wouldnt read over 14.7psi or 1bar, so the ecu wouldnt be able to correct over that mark... maybe Im insane, wouldnt suprise me

 

the afm measures the amount of air going through it, has nothing to do with boost after turbo! but that is no problem, the afm is just some restriction for high hp's! you can correct it with SAFCII if it is at it's top measuring level...

 

maybe its not the afm... i havent slept in 24 hours. it was something though that stops reading over 1bar it seems like. maybe im thinking of another car all together

 

If you are going to stick with the SAFC I would go with 720cc primaries and 850cc secondaries. There is a risk of running lean before the secondaries come online, especially on the highway when you are cruising in 5th gear. I don't think the turbo will make much more power at 18 psi than it will at 15 psi honestly, and I have the same turbo. Apexi use to make a device similar to the safc that could be used to retard timing, but that was several years ago. Retard your ignition at the cas a few degrees.

Also, if you still want to get decent gas mileage set the crossover point on the safc to be based on pressure and not TPS. There are several threads that discuss this subject.

 

stock ecu?

run an s-itc

 

brian does great work! That's why when you think hybrid turbos for rx7s the first name that comes to mind is bnr.

 

thats what happened to me!
550 primaries on a 6 port tuebo'ed motor...5TH gear pull...POP!
be carefull!

 

Looks great!

 

I just picked up an S5 turbo and manifold for my S4 T2. I`ve already talked to BNR
and had decided on the stage 2 as my choice as well. After seeing this post Its firm, BNR all the way.
I had also given thought to some sort of heat rejection coating(s). Anyone have thoughts on that idea?

 

well after reading this thread, my decision is set in a BNR turbo. Most likely a stage one, as I only have 550s and 750s....Im not looking to make much boost at all (12-14psi, ya I know Im not a horsepower freak). Will those injectors and an AFC be enough to support a stage one? I really like the super cleanliness of the BNR units...

 

The stage one won't look anything like his :-P

 

Itll be the same quality, just not the same turbo

 

The MAP doesn't read over 14.7 psi.

 

so you think i'm going to run lean anyway before 3800 (sec kick in)?? i don't know how much boost the stageII is providing before 3800, but i thought the 550cc's with some nice corrections by SAFCII should be able to supply the air with enough fuel before their big brothers come into play!
the only worries i have by running 720cc primaries is that the engine gets bad idling and slight load issues, 'cause i can't correct that with my SAFCII!

 

secondaries won't come on under idle. when theydocome on at3800rpms the duty cycles for primaries will becut in half (if I remember correctly)

 

i used a SAFC to tune with a Rtek 1.7 and it went lean under 3800...
with high comp. rotors though

 

yeah I just remembered that last night

 

12x12 ignition tables? check out www.megasquirt.info and the megasquirt section of this board. you have to be ahndy because you have to build it yourself. there's a few people building plug and play versions of this for the s4's, but for the s5 you have to build your own (for now). i should be working on mine when i get back from spain.

 

Thanks for the support guys. That stage 2 is good for 14-15 psi. Anything beyond that it will be going down hill. That compressor wheel is good for 350 RWHP with a larger turbine wheel, but matched with a clipped stock turbine, it is only capable of mid 330's RWHP but the response is way better with the modified stock turbine.

Chris wanted something a bit more spooly than his old turbonetics 60-1 hybrid. I set him up with a stage 2 with a .50A/R compressor housing. That should give him the response he has been looking for along with some punch.

Bryan@BNR
205 640 1193

 

What is the Stage 4 good for in PSI and RWHP? This is what I'm wanting to go with on my TII and is the Stage 4 offered for the S4 and S5 turbos?

 

ok, so i think by sticking to 15psi of boost i'll be fine with the 1000cc secondaries! maybe i'll try to increase the fuel pressure slightly, so the primaries can bring some little more!

according to bryan that thing should spool quite as well as the stocker, but with some serious hp gain in the midrange! we'll see......

 

here are some pics of: where the rebuild is going to take place, old turbonetics still bolted on, rotor housing with serious wear, my vert with the FD of a friend, and the work area for next spring

besides: i have the suspicion, that the reason for apex seal failure wasn't lean mixture and detonation (was perfectly rich)! but the chrome flakes that come off the edges of the rotor housing with high mileage. maybe one flake big flake came off and was crushed between the housing and the approaching apex seal and then under high load... baaang!!

 

very clean!!!
where did you get the pocket located under the radio/CD player???/

 

nice pics! im going to be upgrading my S5 turbo too a bnr stage 3 soon too

 

let us know how it goes........