I had 3's at first, and it was just like Spy Hunter all the time. Had to put in 1qt. of oil every 500 miles.

Switched to the Stage 2's and I'm perfectly happy with them. I don't notice ANY loss of power, and contrary to what they're suppposed to do, they spool up quicker than the 3's. I get 1 bar by 3800 or 3900, and 1.2 bar by 4500 rpms. So that'd be around 15, and 17 or 18 psi, respectively.

 

Maybe when I sent mine back down I got 2's instead of 3's. Makes me wonder, I see the exact same boost as the last post. No spy hunter either with this set.


Could be BNR knew the 2's would work fine and I would not be able to tell the difference. Not to say I am not pleased with the performance, very happy with it.

 

OK, so BNR has brought back their Stage 2's and Stage 3's.
I don't remember the exact numbers before, but the Stage 2's are "better" and more expensive now.


Note - all info below taken from RX-7 Store:

Stage 1 - Says nothing about psi. Only states that 2nd compressor can flow a calculated 480cfm. So what?
How do I convert that to psi? What was the flow before? That doesn't tell me if it is worth the extra $450 over a stock rebuild.

Stage 2 - designed for peak efficiency and also able to handle 18-20psi

Stage 3 - similar to stage 2 but the compressor wheels are more efficient therefore allowing more air to push thru the motor. Stage 3 will handle 18-20 PSI

So if Stage 2 and 3 have the same PSI capability, is the spool up faster in the Stage 3's???

Which brings me to another question - will any BNR turbo spool faster than a stock twin AND be able to run consistant higher boost (i.e. stock can't handle over 12psi for long time)


So.... I like to ask lots of questions. Hopefully someone from BNR or RX-7 Store can clear this up. I could've asked them, but that wouldn't increase my post count.

 

I am planning on taking this route of t modification in the not-too-distant future, so I would like to know the answers as well, the price difference is worth it if it spools up faster.

 

Been 3 months since I switches the 3's for 2's, and the 2's are making some funny noises while over 6 or 7 psi. Almost like the regular spooling sound, but higher pitched and louder.

They're also leaking some oil too. Can't get away from it...

 

interesting

 

Not really the word I'd use to describe my feelings on the situation.

 

I don't know these answer for fact, just based on other threads...

Apparently the difference in the Stage 2's vs 3's will be spool up time.

Unless you are planning on going over 15 PSI, the stock tiwns are fine. Many people have run the stockers at 15 PSI for years without problems.

 

REALLY!

My understanding from reading peoples comments had always been that the stocks won't survive over 12psi.





The reason I am interested is because my stock non-seq twins are making noise, so I'm planning a rebuild. Upgraded twins are exactly what I want for the money, spool-up, and psi ability (I'm thinking 16psi or so).

--A little info about my turbo's noise if you wanna help me diagnose--
It sounds like metal-to-metal contact
Only occurs during boost (above 0psi). It does not occur at 0psi and below.
It stops imediatly if I lay-off the throttle and boost goes down.
I was wondering if it could be a vacume leak for the following reasons:
1) my idle is screwed up (when cold stays at 2000rpm and when warm will hunt up and down and then usually settle at about 1100rpm, even though I have 900rpm set on the PFC)
2) I'm not 100% confident in my assumption of the noise being metal-to-metal. It could be a funny-sounding vacume leak?!?!

 

I run 14 psi regularly with no probelms (yet )...

 

Ok, I just got off the phone with Bryan and I have all the latest info on the new BNR turbo's.

Here is the deal they are no longer called stage 2 and stage 3.

The new setup is "stock replacement" and 'upgraded replacement".

"stock replacement" is basically going to be all totally new parts from the ground up adapted into the stock compressor and turbine housings (which are non wear items anyway). This will also include larger shafts.

"upgraded replacements" are going to be the same internally as the stock replacements EXCEPT they have a larger turbine wheel and compressor wheel.

They are now in the process of being tested. And a couple sets should be hitting a dyno (and pushed to thier limits) in about a month. I'd imagine if everything goes well they should hit the shelves in around 2 months. In addition, at this time there are NO old style BNR turbos being sold

Hope that helps clear things up some.

STEPHEN

 

hi if this is interrupting just ignore me. but i really need some help if you could look at my post under general rotary tech and help me out id be very grateful

 

So stephen, now there are only 2 types of twins? Stock and Not. Weird.. What is the cost different with the super twins (spacer, twins, new y-piping) etc? Thanks man.. If my stocker will go alitte higher in power at 15lbs with FMIC I cant imagine what they will do (19 or psi)!

Josh

 

Hmm, wonder how he'll honor the warranties on the existing stage 2 and 3's if more fail then.

 

Hello all! I am glad to hear everyones thoughts. I just want to assure everyone with BNR turbo upgrades, that I will honor their warranties. We will soon get some numbers and the site will be back up and running again soon.

I have taken the past 7 months and focused on finishing the new facility. Now I can focus on business. I just want to thank everyone on the forum for hangin in there. It means alot....

Bryan
bnrsupercars@aol.com

 

actually I was the last person to have the stage 123 from rx7 store . net.. One of the guys told me personally. He sed that the guys from bnr do good work but they take so long to do the work and people were complaining. It took me a month when i was told a week for everything. BNR screwed up alot of things with the order so they sed that i was to be the last customer with rx7 store to have bnr done. Thats just what i was told though,

 

Hey Redline.

What some people dont understand is sometimes I don't get turbos on time. When companies are selling the twins, they are actually the middle man. The turbos get sent to them, then they are sent to me. Takes a bit more time to get them back to you. Sometimes I do take a while to get something done, but it isnt always like that. Sometimes when others make mistakes, I often times take the blame. You know how business goes, its always someone elses fault .

Most everyone has been very patient and it makes my job have less stress. If people are upset about the down time of their cars, I appologize. That is something I need to work harder on.

Bryan
bnrsupercars@aol.com

 

Besides, an injector is basically a solenoid - uses an elecromagnet, an input and output port, and electricity.

I can't see how it would suffer any reliability issues from even hooking it up to a battery out in the middle of a field and walking away for 6 months.

 

[QUOTE]Originally posted by ALTurbo2
[B]Hey Redline.

What some people dont understand is sometimes I don't get turbos on time. When companies are selling the twins, they are actually the middle man. The turbos get sent to them, then they are sent to me. Takes a bit more time to get them back to you. Sometimes I do take a while to get something done, but it isnt always like that. Sometimes when others make mistakes, I often times take the blame. You know how business goes, its always someone elses fault .

Most everyone has been very patient and it makes my job have less stress. If people are upset about the down time of their cars, I appologize. That is something I need to work harder on.

yes well u guys did do a very good job so i believe it was worth the wait. i no how it is. People always balme others. i love the way mine came out and ive alredy told a few peeps to try u out. it doesnt matter any way because i havent had my car for three months now so it doesnt even matter y it was shipped back to me so late so idc--as long as it works good and thank you very much! ...now i hope my car doesnt blow up.....let me ask u a question.....what should i run my everyday boost level at.....and say i wanna smoke the guy next to me...or w/e reason what should i make my high bost to.?

 

Assuming that you are tuned for it and have the fuel and intercooler, you can run BNR2s or 3s all day every day at 17 psi on 93 Octane. You'll smoke just about anybody at that boost level

 

Will the larger compressor wheels affect spool-up time? My J-spec twins actually have smaller wheels than the US -spec twins--the J-specs are 1-mm smaller...but the J-spec turbine vanes are re-designed for more efficient flow. Which manufacturer is BNR using for the cartiridges?

 

My good bud out in NJ is running the BNR3s sequential with an open exhaust and basically stock motor (minor streetport). Car spools up very fast and pulls like a freight train after some Kan fine tuning.

The answer to your second question is one that only BNR can divulge

 

i do not have a new intercooler

 

I cant see how anyone could say they would only take a week, espeically when there is a middle man. Just the ground shipping of your core to BNR would take almost a week. Then he had to rebuild and upgrade the turbo then send it back out to the vendor then they have to send it to you. Its well over a week just in mail time alone.

STEPHEN

 

no a week to rebuild.....im not a moron