So I was going to port my stock turbo and turn up the boost to the max that the stock turbo can handle ~11 psi, however I think going with a BNR hybrid is a better choice for the long run. Anyways my question is I don't know what stage to get? then what supporting mods needed to go with it? I would like to get into the 300+ rwhp range.

I emailed BNR and he suggested stage II with rtek 1.8 but I didn't get an explanation on why the stage II and not the stage III or IV.

I searched for a while and couldn't come up with anything but ppl arguing about crap.

Oh yeah almost forgot. 87 TII, apexi N1 cat back, walbro 255.

I know this sounds like the norm noob post, but I promise not wasting your time I have the money and the knowhow to do this.

Thanks in advance

 

Stages 1 & 2 will spool up about as quickly as the stock turbo, but will give much better top end than stock.

Stages 3 & 4 will reach peak boost a little later, but will have even more punch up top than the 1 & 2.

Stage 1 is a T04B V-trim wheel w/ the stock compressor housing
Stage 2 is a T04B H3 wheel w/ a T04B compressor housing
Stage 3 uses a 60-1 wheel
Stage 4 is a 60-1 compressor wheel & a P-trim turbine wheel
Take a look here for more details: https://www.rx7club.com/showthread.p...94#post8975394

Rtek 1.8 with a wideband would be about the minimum to safely run a stage 1 or 2. You would definitely want to find max safe boost based on AFRs, and not just assume you have enough fuel to run say 15 psi.

Rtek 2.1 with 720/1000cc injectors and a wideband would give you more flexibility, as peak boost should be limited by the safe operating range of the turbo rather than fuel supply.

 

so as long as I have a way to contol the boost and a wideband I shuold be able to keep it dafe regardless of the turbo? the wideband was already on the list to buy.

Would a megasquirt be a better option right now the a rtek?

 

no help/input?

 

I would shy away from a megasquirt basically b/c there are more people who use the Rtek and can give advice and help when you need it. I think its more user friendly but you just don't find many people who like, tune, and use megasquirt.

 

You can adjust boost level regardless of the turbo, but keep in mind that many larger compressors are not very efficient at low boost pressures. Running something like a 60-1 compressor at low boost could leave you with more lag and not really any more top end power that stock.

The megasquirt is more involved, which can be both good and bad. It will let you do more & simplify things, but it will have a steeper learning curve.

 

^^ wouldnt he be able to simply control the fuel with an safc2?

 

Spock, I was actually going into the same range.

I was curious about getting a BNR stage 2.

The supporting mods I was going to use were as follows:

Walbro 255 lph
720 injectors all around
The rx7store fuel system (Including the FPR)
safc2 and avc-r to control fuel and boost respectively
^it's only a small step before I find a powerFC^
Koyo n flow radiator
and some sort of FMIC setup.

I hope this gives you an idea of what you might need. Feel free to correct me on anything if i seem wrong.

 

Sure, as long as their is enough fuel available to match in volume of air being pumped in by the turbo. The question is whether 4x720s will be enough to support a BNR stage 2 at max safe boost. Theoretically, it should be with a good fuel pump, but it's always a good idea to see what the AFRs are before jacking the boost level up.

I'll be going with a BNR stage 1 or 2 later on, and I'm still trying to decide what setup I want to use. It'll likely be 720/1000cc with a rtek 2.1 & wideband.

 

On my 10th AE i had a B&R stage 3 running an Rtek 1.8 with a 255 fuel pump, 550/720cc injectors, an Aeromotive FPR, and a wideband and i was running slightly rich at 12 psi believe it or not.

 

Why were you running the rtek 1.8 with 550cc primaries? That is what the 1.7 is set up for. Do you know what type of numbers you were putting down?

 

I hadn't thought about how the compressor would be inefficient at lower boost levels, thats a good point. I just want to have to waste money buying a turbo twice.

I don't know a whole lot about the megasquirt because I have never really looked into it deeply. I know it can control fuel but can it control timing also? I am not too worried about it being more difficult to use since this isn't my primary car leaving me with time to learn.

 

yeah that is basically what I was looking at for support. wasn't going to do a radiator yet though. And was thinking of going a little different with the boost and fuel control.

 

Well I have two 720's already. But I dont want to run 550 primary just to be one the safe side. I detonated my last engine because of running to lean. So I'm trying to be on the safe side after my current rebuild =P

I by no means plan to stay stuck with the SAFC, like i said it's just a stepping stone before I get a full standalone. I'm not even 100%sure on what to get. I'm reading between the Haltech E6x or Power FC. I don't know which is more user friendly, because if I get the Power FC i'd probably just get a Datalogit with the ECU. I dont know if it'd be more efficient to get it with the controller or not.

 

Yeah Haha My old radiator is beat up like hell. So i decided that I might as well upgrade while everything's apart.

As for the Boost Controller. My friend has been trying to persuade me to get a GReddy controller. I think it's a touch screen one. I don't know if anyone has heard of this. I honestly had no idea if he was drunk off his *** or serious. If anyone can shed some light on what this is...well please do!

 

Yeah that makes sense to get a rad then. I will get one later.

I was just going to go with a manual boost controller. That boost controller sounds expensive. Are you really going to be changing your boost level that often that you need a touch screen?

 

Well I wasnt really even looking at getting it. im happy with the avcr. I dunno. Im just trying to do research into a bunch of different boost controllers to see what suits my needs best.