has anyone had problems so far, such as cracking of the housings, oil blow-by, etc?

the manifold is welded and ceramic coated, correct? wastegate is ported with a bigger door?

Pettit wants about $2800 for the '99 spec twins with ceramic coating and ported wastegate, and for that price I'm leaning toward the BNRs....I'm not ready to take the single plunge just yet, I like the streetability of the twins

 

with twins i would buy the 99 spec twins, because they are a new unit and an upgrade from the stock twins. bnr's are nice and might make a little more power but i dont think they will last as long as the 99's. if you are considering spending $2500+ , i would go single. when i was looking for turbos i wanted the same ones you posted. i was also looking into small single turbos. so i bought the apexi rx6 kit and a set of bnr stage 2's lol. i installed the single and loved it. the responce is very close to stock seq. twins. no need to downshift , just punch it and at around 2800-3000 rpms ( depending on gear ) i have 10psi. i heard the t04e and gt35r spool the same as the rx6. the powerband is much nicer with a single. also much less vac lines to deal with.

 

What psi you thinking about running?

 

the decreased complexity is a huge selling feature of going single....I like keeping the engine bay as stripped down as possible, if I could get full boost by 3800 rpm and about 375 hp, I'd be sold

I'm only looking to run about 15 psi for long term reliability reasons....seems like the 17+ motors don't last

 

I have to admit, Jason's write-up (rx7store.net) on the BNRs sounds pretty good, though

The new BNR Stage 3's have many improvents over the factory HT12 turbochargers. The factory HT12's are not rebuildable in most cases. The stage 3's however are not remanufactured turbochargers. They have new CHRA's (Center Housing Rotating Assemblies) and the factory end housings are machined to fit the new CHRA's. The Stage 3's are not rebuilt or remanufatured.

The turbine wheels have larger inducer and exducer measurements over stock giving the turbine wheels more leverage to push the larger, more efficient compressor wheels while decreasing backpressure in the turbine housings. The turbine wheels have more blades giving it even more leverage than before and also the wheel casting is much thicker than stock. In an event of a blown apex seal, the turbine wheel (more than likely) will survive, unlike the stock turbine wheels in the stock twins or the 99 spec twins which are a very thin cast that will be heavily damaged. Apex seal damage will cause slow spool, inadequate boost, and lack of power. The shafts in the stage 3's are 1/4" in diameter compared to 5mm in diameter like the stock/99 spec twins. Also the shaft has left hand thread shaft nuts which eliminates the issues of shaft nuts shooting off like the stock turbos have a tendancy to do under high boost. It can lead to engine failure if cases are bad enough.

The thrust bearings are upgraded to a 360 degrees for proper lubrication of the rotating assemblies up to 180K rpm! This means you can run a tremendous amount of boost without killing thrust bearings. The stock thrust bearings are 270 degree bearings which aren't reliable to run over 15 psi of boost. 360 bearings are standard on BNR Stage 3's.

The stage 3 comes with an adjustable wastegate actuator. This allows you to turn up or down the boost mechanically w/o a electronic or manual boost controller. The adjustable actuator can also make the boost controllers more effective because you are working them less to turn up the boost.

The stage 3's can be ran sequential or in non sequential forms. When sets are ordered, please include complete Y pipe for modifications. Extra charges will be given to customers who want a full non sequential conversions. A one year warranty goes along with each set of BNR Stage 3's. We do need your turbocharger cores on purchases!

 

The 99 spec twins are most definetly not an upgrade over stock!! Why does everybody think that because its a JDM part its better?

 

the 99 twins are slightly upgraded over 93-95 twins. they have much better seals, and are better at above stock boost. here are some threads of 99 spec twins at around 15 psi.

https://www.rx7club.com/time-slips-dyno-121/sleepr1s-speed-sauce-racing-rx7-r1-dyno-plot-287944/

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/99-spec-turbo-dyno-results-221032/

 

Rich, Goodfellafd3s has had them for a while and you can find a number of threads about his comments, he loves them. Guy I know Neil, su_maverick, also has a sequential set he got put in over the winter...

I'd definitely ask them.

 

Rich still has them...not sure I consider his an objective opinion though, I think he sleeps with a set of BNRs by his pillow

 

Yeah he very well may do that

From my perspective, I'm only concerned with the oil blow by and what not, basically the overall quality. I must say Rich's car even just at 11 psi or so pulls freakin hard.

 

lol! I'm glad I didnt take the time to reply to your pm

 

rebuilding twin turbos is a BAD IDEA.


if your current twins are in good condition, then go ahead and upgrade them. i had an 8 month nightmare with rebuilt turbos. it is a PAIN to take them on and off every other month.

 

Neal was on break-in for like a decade, so he's just getting 'em tuned. Dunno if he already has or not (he was goin to Ray). Of course, none of that matters when you drive like a girl (I'm messin Neal )

 

I agree with this....that is one reason why there were so many problems with the old style BNRs.

The new ones aren't rebuilt---completely new CHRAs inside bored out housings.

 

Check my sig for my dyno sheet and more info on the BNR's. I still love mine and I'd do it the same way if I had to do it all over again.

 

agentspeed,

I noticed one of your issues was boost creep, did you ever get that resolved? I know Rich had the same problem at one point...the crap stock manifold is the limiting factor with these turbos, boost creep killed my last engine and I'm not going through that again

 

also, what problems did you encounter running sequential?

 

I just replaced my resonated midpipe with the metallic cat and it cured my boost creep. Now my dual stage boost controller holds it at 12psi (on low setting). I haven't completely set the high setting on 15psi yet because I'm in the middle of finishing my wideband install. I'm also going to put the resonater out of my midpipe in with the cat so then I'll have to further tweak the boost controller...

I switched to non-seq just before my first motor popped. I just liked the clean look better. I had stock tubos then too. After seeing non-seq, I wasn't going back...

 

are you planning to re-dyno with the cat installed?

 

I'm not sure where you're getting your info from but you have been wrong on numerous accounts.

Get your wastegate ported (which Bryan does) and you don't have boost creep problems.

How do you know the 'crap stock manifold' is the limiting factor?

For record, I have never had boost creep problems with these BNRs.

 

wrong on "numerous" accounts? nah...

you have mentioned boost creep before, it may have been another set of turbos

the flow characteristics of the stock manifold are notoriously poor, compared to a single turbo manifold

don't mind my post count, I've been here longer than you

 

I have the stage 3's right now. No oil blow by and they have a one year unlimited warraty anyway. The CHRA's are all new as the ad on RX7store says. the machine work is top notch. They are identicle to the stockers interms of operation just send in your manifold, turbos and y-pipe and they BNRs are slightly longer and require that the y-pipe be extended on the secondary side. Interms or lag it is there if you run parallel but the difference in sequential as minimal. They are great turbos and bryan is a great guy to talk to and do business with.

Oh ya and boostcreep is not a problem at 15psi ever with the ported wastegate.
I am running ic, intake and main high flow cat only with a pfc. great setup overall.

 

LOL! You're a pompous little guy. I bought my FD back in 1998, and ported and built the motor that is in my car, not to mention starting a rotary-specific shop up. I can't believe I even have to mention any credentials.

Don't try to play "whose dick is bigger" with me, because it won't work. Maybe you're Ari Yallon in disguise? maybe then you may have gotten me, lol.

Here's a quote of yours:

"has anyone had problems so far, such as cracking of the housings, oil blow-by, etc?

the manifold is welded and ceramic coated, correct? wastegate is ported with a bigger door?"

Which housings do you think are cracking? compressor? turbine? how often do *you,* mr. expert, think they crack?

oil blowby? why would they have oil blowby problems? do the stock turbos have this problem? Why would these turbos have those problems if the stock ones don't?

manifold welded where? sequential or non? ceramic coated? no. wastegate with a bigger door? where are you getting all of this?

Now perhaps you see my point. I don't waste my time with people like you, asking a bunch of half-assed, ill-researched questions, and expecting someone to hold your hand and make it all nice and easy for you. Then, you have the nerve to talk **** to me? unbelievable. Here's a hint: go to www.howstuffworks.com and spend some time. I am done with your thread.

 

bahahahhahaha

 

rough night, Rich? cool your jets, I'm not trying to challenge your "highly esteemed" position on this forum, nor do I claim to know anywhere near as much about the BNR turbos as you, which is why I posted this thread...I'm simply stating I've owned an FD as long as you have, and I know a few things about these cars...thanks for being a pompous ***, I thought you were pretty cool before this