From the little information I have found on here and elsewhere, it wasn't ever a very common turbo for the FD but it is a ball bearing unit good for something around 400 horsepower. However, I can't seem to find the specs, dyno results and general driving opinions from previous owners.

I ask for more information aout this turbo for two reasons:

1. There is a used one with a P27 turbine housing for sale in my market for a very good price (full kit with manifold, downpipe, oil lines and wastegate); and

2. My twins might have given up the ghost so it is worth thinking about a single swap now.

My car is a weekend toy which sees about 10-12 track days per year and the twins are fun except for the very top end above 7k where it falls off a cliff. I have a stock motor with OEM Mazda seals with an average of 7.6 bar (c.110 PSI) on the front rotor and 8.0 bar (c.114PSI) on the rear rotor.

I think 350-400 horsepower is probably enough for this type of driving and would also allow me to simply run a larger SMIC than stock so I can keep the battery in the engine bay and just upgrade the secondary injectors to 1680s.

But what are the pros and cons of the RX6 compared to say a T04S, T04E/S hybrid or a GT35R? Are they rebuildable if necessary? Although that probably isn't much of a concern for singles anyway.

Thanks.

 

Its not a rebuild-able turbo to my knowledge. They are prone to a short life because of the very small turbine wheel & housing.

If memory serves me correctly its like a GT35R with an even smaller turbine wheel.

 

Thanks. Does the small turbine housing imply high heat? Would my AEM water injection kit do enough to keep EGTs in check?

 

I have installed a few of those and tuned them, but its been years. As I remember it spooled quick and made pretty good power (400+). Not rebuild-able which is a huge downside.

 

The Rx6 is made by IHI, the same supplier that makes the stock turbo on Subarus (except the new direct injected engine). Since it's not part of a more common line of turbos for aftermarket use there's not a lot of support for it.

I'm sure you can get a newer generation turbo from BorgWarner or Garrett or whatever that will meet your needs and have better support.

 

Fair enough. Seems like it's a decent turbo but quite old and little to no support for it. I'll pass on it and weigh up my options with respect to swapping in some used twins (99 spec abraidable like my current ones or not) or converting to a single and looking for a good deal on a GT35r or older Garret turbo like a T04S. The EFR stuff is just too pricey to justify since the older turbos seem to be 80-90% of an EFR for a lot less and will more than satisfy my requirements.

 

^ im glad to see someone else liking the old school turbos. The EFRs are nice but like you said pricey.

 

new turbos are better period. if you want cheap look at the SXE line.

 

Well, everyone likes new things which is why most people upgrade their phone every year, but if the old stuff is nearly as good and is proven to work and be reliable then it really doesn't make economic sense to fork over the cash for the latest and greatest tech.

Sure, the EFRs are more responsive and the IWG units are a bit more simple in construction to make plumbing easier, but on a drag strip or a track they won't make much difference (or more power) compared to an older turbo with similar dimensions because you are almost always in boost in those situations. And at that point you are pretty much limited by the size of the housings, A/R and other traditional turbo specs.

At least that is how I see it and for me I could care less about responsiveness on the street since I am limited by so many speed cameras in and around London and the UK that I end up driving like a grandpa on public roads and only get to enjoy the full potential of my car on the track.

 

I’m sure they work better.

Problem I’ve seen with BW turbos is they are physically big.

I prefer to have a single waste gate cast manifold for my setup and the BW turbos won’t fit without banging on the firewall or notching it for clearance.

 

The S300SXE are quite big, GT40 sized. However the S200 is not big at all if looking for a 350-400rwhp setup;

BorgWarner SXE

If you need even smaller compressor sizing(To4S);

http://www.turbosource.com/Turblown-...4-23-78398.htm

 

^ this was a s256. it was hitting the lim and frame rail.

this was a t04s. flat blade between. the frame rail ans turbo to show how much room was there.

 

Gotta admit though, a huge turbo in the engine bay looks pretty sweet =D
^simply the wrong manifold for the job. I Run a S300 and its fine. No banging or nothing of anything.

 

Low down manifolds are sweet! You can keep the air pump and it also looks more stealth.

 

but you run a modified manifold with dual wastegates.

I wanted to use a manifold with a single wastegate for simplicity.

 

either way.. an s256 on a to4 manifold ist going to fit as well as a to4 on a to4 manifold. just get a compatible manifold for single waste

 

its been a LONG time, but here is the scoop.

Apex'i offered these kits in a couple of flavors. the early kits had a long manifold that placed the turbo approximately where the air pump would have been, the later kits had a short manifold, and thus fit with the air pump, so it could be fully emissions legal if needed.

the Rx6 turbo came with two exhaust housings, although in the states we weren't generally offered the choice. the Rx6 itself is an IHI turbo, ball bearing, its oil cooled only. its a T3 flange (i think), exhaust is really small.

it spools quickly, and did something like 340rwhp@12psi on a car with a stock engine, bigger IC and full exhaust being the only other mods

there also was another very rare kit with a bigger turbo, and a water cooled waste gate, it was good for 380hp@12psi, or there abouts

 

Very quick spooling turbo, but won't make much more power than the twins. The tiny exhaust side creates a lot of back pressure and therefore heat. Its good for people who just want to replace the twins with a super responsive single for simplicity. The biggest downside is I don't think anyone has parts available for it should it fail on you. If you find a good one cheap and don't care for a lot of power, then go for it. Otherwise I feel there are much better options these days.

 

I have this kit on my FD and have about 40,000 miles onit and it hasnt failed me so far. I made 378rwhp on 91 octane with this kit. It spools very quickly, almost as quickly as the stock twins but if you are looking to make more than 400rwhp there are other turbos that will get you there.

 

I have the same turbo on my FD made 380+whp here's a dyno chart.

 

Here's a couple pics of what it looks like installed