BNR S4 Turbos @ therpmstore.com

[RPM]

BNR STAGE 4 IS HERE!











Following the amazing success of the BNR Stage 3, which has been chosen
by many as the best, most cost-effective way to maximize the stock block,
BNR has taken things a step further with the Stage 4!

The Stage 4 turbo steps into true big-turbo territory, featuring a custom
T04E 50 trim compressor wheel with 76mm exducer and a GT30 turbine wheel,
putting this turbo in the same ballpark as the popular Garrett GT3076.

BNR Stage 4 Turbocharger for Mazdaspeed 3 / 6 #BNR-MZ4

^^ ORDER TODAY! ^^

NEED FINANCING?
We've got you covered! We offer two different financing methods.
Read more about them here:
FINANCING OPTIONS @ therpmstore.com

[g00s3y]

And I just installed my s3 a couple weeks ago......

[RPM]

Originally Posted by g00s3y And I just installed my s3 a couple weeks ago......

Well, the S3 seems like a good fit for what you have listed. Unless you build your motor, you wouldn't be able to take full advantage of what the S4 will offer.

[JgamB]

I'd like to see how responsive this turbo is. If spool characteristics are good, it could be the logical upgrade to ensure you never need more boost unless going full R-tard.

[RPM]

Originally Posted by JgamB I'd like to see how responsive this turbo is. If spool characteristics are good, it could be the logical upgrade to ensure you never need more boost unless going full R-tard.

It's on par with the GT3076 or a little quicker. It will hit 20 PSI around 3700 RPM.

They do plan on releasing dyno charts. They're just waiting until the car is ready, so they can release the best chart first.

[g00s3y]

Originally Posted by RPM Well, the S3 seems like a good fit for what you have listed. Unless you build your motor, you wouldn't be able to take full advantage of what the S4 will offer.

Oh I know, building will definitely be happening. Gotta get the house with a garage first so I have a place to build the motor.

This should be a great seller, just like the s3 was.

[dale_gribble]

My BNR S3 hit 20 psi at ~3600 (before I adjusted WG spring pressure preload and got it to 3,300). That's not bad for a larger turbo. I think the MS3 can benefit from a slightly later spool anyways since big gains in the 2,500-3,500 pretty much translates to wheelspin.

That's great that it drops into the stock location and doesn't need a massive whale penis intake. This could probably pass a roadside visual and smog visual inspection in Cali, and since it mates to stock intake size, it makes it that much easier. That also means guys could swap in the turbo and then upgrade to large intake later.

Knowing Bryan, I'm sure the turbo is balanced flow wise, so probably no boost control problems (i.e. spikes) either.

[RPM]

Well, it does have a 3-inch inlet, so it will need a larger intake, or at least a larger coupler if you already have one. I'm not sure what size starts to constitute "whale penis" size.. haha

[Thepedigree13]

As a guy that swore I was going to stay stock until the car was paid off, I think this turbo would be good for me.

I swear now I don't want to do an engine build, but I would probably buy an S3 or CS turbo and eventually get bored and/or want more. This S4 may be the right turbo for guys like me. Could be fun on stock block, but has potential to take you further.

And that bundle price is crazy, very tempting.

[JgamB]

Originally Posted by dale_gribble My BNR S3 hit 20 psi at ~3600 (before I adjusted WG spring pressure preload and got it to 3,300). That's not bad for a larger turbo. I think the MS3 can benefit from a slightly later spool anyways since big gains in the 2,500-3,500 pretty much translates to wheelspin.

I'm fairly certain this test car has a JMF intake as well, which isn't going to help spool.

[RPM]

Originally Posted by JgamB I'm fairly certain this test car has a JMF intake as well, which isn't going to help spool.

Yes, it does have a JMF intake manifold.

[Code Monkey]

Is it possible for Bryan to put a thicker bead closer to the edge or on the edge of the turbo outlet? I used a shorter coupler on my BNR S3 and the t-bolt clamp was above the thick bead and I blew the coupler off after 4 road racing sessions running only 21 psi of boost.

[RPM]

Originally Posted by Code Monkey Is it possible for Bryan to put a thicker bead closer to the edge or on the edge of the turbo outlet? I used a shorter coupler on my BNR S3 and the t-bolt clamp was above the thick bead and I blew the coupler off after 4 road racing sessions running only 21 psi of boost.

The outlet does taper, so if you can get it on a couple inches, you shouldn't have an issue. Honestly, if you have a quality hose clamp and tighten it properly, you shouldn't have that issue. Many people are running more boost for extended periods without issue.

[Code Monkey]

^ Yeah, but they hit the boost a few times for a short period of time and call it quits, try doing it 4 times a day, 30 minutes each time.... Just saying, it would not cost him much time or effort, and it would make the turbo better for those who run a fmic. Guys who run a tmic do not have this problem as the coupler is jammed between the turbo outlet and the intercooler inlet.

[biggman026]

If you're just wanting a thicker bead on the outlet, that seems like something that would take a few minutes of welding - I can't see a shop charging you more than $20 for something like that.

[SNOW_QN]

I hate this forum. Every time I get on here I buy something, or plan to buy something that I never intended on purchasing. I'm going to be broke in no time.

On that note, anybody upgrading from an s3 to an s4 need to get rid of their s3 in order to get an s4? 😁 I might be putting up a WTB thread soon. Lol


Edit: that's a hell of a deal on the s4 package btw

[MS3Shadow]

Very good deal on the combo.

Might look into this compared to the CS Turbo.

Sent from my HTC M9

[RPM]

Originally Posted by MS3Shadow Very good deal on the combo. Might look into this compared to the CS Turbo. Sent from my HTC M9

Thanks! This turbo isn't really comparable to the CS turbo, though. The CS would compare closer to the S3. If you're planning on building your motor at some point, this is the way to go.

[maddocx240]

My motor is getting built as we speak. But as much as I an tempted to get this, bnr turbos have a rep for having issues at first production. I will stick with my s3 for the time being. If I hear of no issues by next summer, then I will get one.

[PurplFox]

Cant wait to get more info on this thing.

[Zoom66]

Hmmm.... this looks interesting. Do I get this one or a GTX3076 to replace my GTX2867 on my freshly built motor??? Decisions, Decisions....

[Awal]

Nice unit, package, and price point. Definitely tempting for someone who can resist turning up the boost until they build their motor. I'll wait for test results before I decide whether this will be the route I go, I'm always a little wary of first runs on new products that move at 1 million RPMs

I hope it goes well for anyone who tries this turbo.

[taf0422]

Originally Posted by Awal I'm always a little wary of first runs on new products that move at 1 million RPMs I hope it goes well for anyone who tries this turbo.

Not like its his 1st ever turbo

[Awal]

Obviously not, by no means did I imply it was. But even 1st run Honda Civics have their fair share of issues.

edit: I'm fully pulling for this to be a fantastic product, just like the others, more great products for our platforms/engines is all one can ask for as a performance enthusiast.

[maddocx240]

Originally Posted by taf0422 Not like its his 1st ever turbo

Yeah but the s3 had a few issues. Bnr s3 v1 had the bolts that were coming loose from the housing. And the s3 v3 had the wastegate issues. So I would wait to see how the s4 performs initially before I jump on it.

[taf0422]

Originally Posted by maddocx240 Yeah but the s3 had a few issues. Bnr s3 v1 had the bolts that were coming loose from the housing. And the s3 v3 had the wastegate issues. So I would wait to see how the s4 performs initially before I jump on it.

Also because no one ran the turbo prior to the release. It was just released without testing. V3 wastegate issue due to bryan making own housing instead of reusing k04's.

This turbo has been on my car since June 19th with 2500 plus miles on it. Only issue was wastegate port being too large which has been remedied

Just as an fyi

[BLKSTIG]

Well, I went to BNR to visit with Bryan for a bit yesterday. Lots of stuff going on at the shop. Plenty of turbos being built. If you want an s4 you better go ahead and preorder. Killer turbo. The knowledge Bryan has with turbos and how well they will perform always blows my mind. Basically, Just get the turbo is what I'm trying to say.

And Thanks RPM. the 4k$ I spent earlier this is finally about to be put to good use as my build is almost complete. I love it when awesome people team up to offer the community greatness.

[maddocx240]

I don't doubt bryans knowledge of turbos, I do run the s3 now. Just the kinks it had initially. But if testing them and they are good then that's great.

[BLKSTIG]

funny you mention that. I brought that up yesterday when we were talking. It's painful to see things like this happen with any vendor, but they were handled professionally and quickly. He realizes that while his company can suffer when things like this happen his main concern is the consumer and making sure that we are happy. That means a lot to me. These units won't see any problems at all with boost control....

[JgamB]

Originally Posted by maddocx240 I don't doubt bryans knowledge of turbos, I do run the s3 now. Just the kinks it had initially. But if testing them and they are good then that's great.

The "established" ~500whp turbos haven't been faring too well for reliability if you've done any reading here or on other social media.

@nindoja; and I figured out the initial IWG issue with the S3 V2, Bryan had it fixed within the week, and recalled the whole lot that had been shipped. He takes care of his customers, and some other people haven't been as fortunate with their large turbo manufacturer's followup.

[maddocx240]

Originally Posted by JgamB The "established" ~500whp turbos haven't been faring too well for reliability if you've done any reading here or on other social media. @nindoja; and I figured out the initial IWG issue with the S3 V2, Bryan had it fixed within the week, and recalled the whole lot that had been shipped. He takes care of his customers, and some other people haven't been as fortunate with their large turbo manufacturer's followup.

really haven't heard much on that subject of bigger turbos failing. But I like that the s4 is being tested before it's released so that's a good thing. Like I said I have an s3 and its been fine so I have no issues with Bryan and his product knowledge.

[MD1032]

Originally Posted by Zoom66 Hmmm.... this looks interesting. Do I get this one or a GTX3076 to replace my GTX2867 on my freshly built motor??? Decisions, Decisions....

The ATP kit for that turbo retails for $1849. Please explain to me why this decision is so difficult for you.

[Mazdazilla6]

Mmmm definitely might have to upgrade after my engine is built. This price is crazy stupid good. Will the price remain the same after it officially launches @RPM;?

[RPM]

Originally Posted by Mazdazilla6 Mmmm definitely might have to upgrade after my engine is built. This price is crazy stupid good. Will the price remain the same after it officially launches @RPM;?

Yes, the price isn't expected to change.

[specvspeedfreak]

As I am on the shitter; i can vouch that bryan will take care of you if something does happen. 》coming from the (2nd) guy with documented S3 v2 issues...

That being said, i really dont have worries that the S4 will be a great turbo for most... stock or built

[Awal]

I definitely didn't mean to imply anything bad about Brian's turbos or BNR, sorry to have tilted the thread into that direction. Just thinking out loud, I've been bitten by bad luck a few times on brand new products.

The price is truly insane for a turbo of this magnitude, I wish it great success.

[Zoom66]

Originally Posted by MD1032 The ATP kit for that turbo retails for $1849. Please explain to me why this decision is so difficult for you.

For one I have aftermarket Kozmic oil feed and drain lines on the my GTX and there is always the decision of bearing type in the CHRA.

[neganox]

I remember Garrett saying that the CHRAs on the GTX turbos were not rebuildable and you had to send them in for service should something happen. Meh to that noise.

[dr_banano]

well my bnr s3 started leaking from the exhaust bracket side no oil its and exhaust leak , havnt checked it good , but this s4 looks tempting ...

[dr_banano]

Originally Posted by RPM Yes, the price isn't expected to change.

will it come with the studs and the crush rings and drain gasket?