Recently my twins went bye bye along with my motor. (original @ 82k). I am looking at either the BNR Stage 2 twins or the Apexi RX6 single. I really want to go single and get rid of all the TT madness. Also free up some engine space, reduce temps, make SAFER power etc...One of the things that moved me more towards the single is that is spools quite quickly and still makes 300+rwhp at low boost. I don't think I can say the same for the Stage 2s which I have heard have lots of lag. How much more realiable is a single upgrade rather than upgraded twins? I'm not looking to make 400+rwhp so the RX6 is fine with me. For anyone with this turbo (RX6), what injector size are you running? As of now I am placing an order for the Greddy 2-row FMIC and Apexi PFC. I have the walboro 255 fuel pump but am kinda worried not enough fuel will be on delivery? Which pump are you guys running?

I already posted in the single turbo section, just thought I would post here to get more views. Thanks for reading.

 

From what I hear, the only draw back of the Apexi turbo (besides price) is that it's not rebuildable (at least not here in the US). So if it goes south, it's gone.

 

I have the RX6 and I like it. If you are not looking for big power, I would expect that you can run the car quite reliably at 12 psi or something with reasonably decent tuning. I still think it is a good idea to get some dyno tuning with a wideband since the setup is so different from stock, but I don't think you'll be in real motor-blowin' territory at 12 psi as long as your maps are rich enough.

That said, it seems like everyone who goes single just wants a bigger turbo after a while. I am not looking to sell mine now, but if I blow it up I'd probably get something bigger to replace it if the cost is not outrageously different.

But some people do have an unbelievable amount of restraint. You might be in that category since you are thinking about going single and don't have dreams of 400HP, 500HP, or beyond.

The RX6 sounds like it would be good for your needs. But you might want to take a look at the XS T04E kit, as it is less expensive and said to spool just as well (or better, depending on who you talk to).

-Max

 

Oops, forgot the rest of your inquiry...

I am running 550/1300 injectors with a big *** SR Ultimate pump. If you have modest power goals, your Walbro pump should be just fine, and you might even be able to get away with running the stock injectors.

-Max

 

The Apexi RX6 is nice but as posted above is not rebuildable here in the states. If an apex seal goes through your turbo, it costs about $1800 or so to a whole new turbo. The BNR stage 2s don't have any lag running sequentially. The BNR stage 3s which are $1800-2000 have absolutely no lag period sequentially and even running parallel have more power down low than the Apexi RX6 (comparing SPOautos BNR Stage 3 dyno to Apexi RX6 dyno). The Apexi is expensive and doesn't have a warranty - kind of risky....

 

I would suggest GT35/40

 

I have the rx6 kit and enjoy it very much, it spools quick and is pretty quick at 10 psi of boost, which I am running right now. I have the nippon denso fuel pump and stock injectors. There is almost a 100% chance that the IHI turbo will last longer then anything else on the car, except if you blow an apex seal, so i would suggest building a strong motor to start out with.
good luck

 

I have heard nothing but great things about the GT35/40, however it is way out of my usable range. The GT35/40 spools quick and has the top end comparable to the T-78, but again, it's just too much overkill for me. Also with that turbo I would be too tempted to extract the capable power out of that badboy and spend a whole lot of money in the process.

The BNR's are also great and have a great builder behind them (Bryan @ BNRSupercars). The one thing that intrigues me more about a single than an upgraded twins package, is the simplicity. A single takes up way less space than any upgraded twins, looks better, drops under hood temps, stainless manifold, makes safer power (so i've heard?) and no lag on the IHI RX-6. (stage 3's are an exception). Also, is it true that the BNR's flow through the same manifold as the stock twins (H12's)? I was doing some searching and saw a thread that stated they make good power but are restriced by the manifold. Anyone care to answer that? Anyways, thanks to all those who replied. Max, do you have AIM or any sort of online live messaging? I'd like to speak with you more in depth if thats ok. Thanks again.

 

I like my RX6 but wish I went bigger. In comparison to the stock twins, my water temps are a lot lower, my air intake temperatures are drastically lower, and the car is so much simpler and has so much more space underneath the hood it's unbelieveable. I am running 550 primaires and 1300cc secondaries. I would rather keep it single than get that BNR twins as the car will run more reliably and yu will have a more consistent power band. Also the single turbo doesn't rely on all those vaccuum hoses that always die of heat soak.

 

Compared to the twins, there is some lag with the A'pexi RX6 turbo. It's small and not nearly as apparent as some of the bigger single turbos, but it's not like it's non-existent. I will say that I was very impressed with it's linear power delivery. A lot easier to manage than the twins with their peaky tendencies. Left-foot braking suddenly becomes a need and not just a time-shaving technique. If I need a turbo/turbos in the future, I will definitely be looking at an RX6 as an option.

 

What about A-Spec's new twin kit? Have we gotten any new info on that kit?

 

I think audibleeffects will have his RX-6 kit for sale soon. It's on his car right now, but he plans on upgrading to a GT42. Too bad you can't PM him right now for some reason...

 

Cetchup, why do you think that the gt35/40 would be overkill? I've been trying to decide which single to go with for a long time, and I came to the conclusion that the 35/40 is the best one for me. And what I want, seems to be what you want. I'm basically looking for 400 rwhp. Dave at KD really likes this turbo, and thinks that I can get pretty damn close to 400rwhp(even though i'll still be running an upgraded cat, and non ported motor).
I see it like this..........I'm not looking for 500rwhp................yet , but the turbo spools quickly, and I still have more room to go if I ever want more. It seems like a win win to me. I looked very hard at the Apexi, but I would be pissed if I ever started wanting more power.
But, of course, everybody's different.

 

I was in the same boat you are a few months back, I decided against going for a set of upgraded twins for the exact reasons you listed.. and I wouldn't go back now. My car's water temps are down 5-10 degrees C on average now in similar conditions, and the air intake temps are way way down. My average air intake temp cruising on the freeway is in the 30's C, and even in traffic I have yet to see above 50 C (I'm sure I will in summer time). I went with an HKS TO4E kit because, like you, I don't need overkill.. just a mild upgrade that really is capable of plenty of power. I am not sure where you are in CA but I would be happy to let you check out the car, a TO4 spools very fast and makes a fun to drive car on the street.

Matt

 

Just for my personal reference of how fast your single turbos are in comparison to the 1/4 times.....

What is your fastest time and trap with these turbos (10-12psi):

RX6?
TO4E?
GT35/40?


And when you guys say "spools quickly", can you give me a RPM range of when it starts to spool and when the turbo fully boosted?

Thanks.

-Dan



EDIT: Also would like to include just the basic setups, with no super duper ports, just basic bolt ons with ECU and tuning set at 10-12psi........ TIA.

 

I'm running the BNR Stage 3s in parallel and love them. They are very similar to a single at a much lower price. They spool quickly, and I've eliminated all the sequential b.s. It does use the stock manifold, but when running parallel you can have the flapper door cut out to free up alot of the restriction from the stock setup.

 

from reading this id definetly go with the rx6.. as long as I had someone really good building and tuning my engine so that nothing would happen to the turbo..

 

Because you live in California I would suggest a turbo kit that allows you to retain the air pump. I know the HKS kits allow this and may also be C.A.R.B. Legal but you need to research this. Unless you dont plan to go through normal channels to make the car legal. I think you will be more than happy with the RX6. The GT3540 is a great Turbo but its not for everyone. You can get well within your HP goals with the RX6. Even the T04e. You cant run a Cat unless you have an Airpump or it will just clog up.