Personally I would just wait a few months till the TSE borg warner EFR turbo kit comes out. Great spool, great top end, far less piping, weight and complexity.

Uhhh.... yea, ok?

Lol... because I'm totally looking to spend like 3k on a EFR and associated parts in a kit. Did you read the thread at all?


Anyways, for all of you wondering I've decided to go with an SR20 turbo for simplicity with the ATP external 44mm wastegate housing.

ftfy

Farking nuts that Toyota. I'm not quite going to go to the same level he is (well maybe one day). For now a solid 20-22psi ish. If I can make 330whp and break 250wtq I'll be happy.

Oh, and he too is blowing the turbo into the Rotrex. Same plan I have.

So I have found a solution to all my problems. The stock Nissan GTi-R SR20 turbo has the same turbine wheel as a GT2871R and therefore the Tial housing will work. Now, finding one of these turbos is proving difficult (one that's priced realistically).

So, what I am looking for is a turbine wheel (just on it's own) that is a 76 trim with a 53.8mm wheel. I have a s13 turbo sitting here and if I can find a new turbine wheel that is that size (for a bush bearing turbo obviously) then that will work too. But again, I'm having problems finding what I need.

Then again if you sold the rotrex setup you'd get good coin for it then the EFR kit wouldn't cost you 3 grand price difference. I admire you for even trying just a complicated setup, but I've also seen it done before. A local guy has a twincharged setup in a civic that's very competative in One lap of America.

The tuning is a pain, the car still has weird issues, and still doesn't run 100% the way it should. You also now have 2 major systems that can fail instead of one, and all the extra weight.

If the car sees any track time I do not see how you'd profit from this setup versus a properly setup turbo. Either way I wish you luck, sounds like a badass build.

I'm aware of the Enmo Civic.

I am not selling the Rotrex. Thanks for playing.

I don't think you quite understand. For me it's not about slapping something on, making big power and that's it. For me I enjoy building more and doing something different than everyone else. It's either keep the Rotrex as is, put a 3'' exhaust and large IC and call it a day or twin charging. Not "just" turbo. I've been down the turbo route on this and many other cars. And, if I DID want to go EFR why wait for TSE? You can buy a manifold/dp from Abe, buy the turbo and make your own IC. Instead of waiting months. So yea, for now no turbo. Future... maybe, which is one of the reasons I'm going to go v-band (for future upgrades if wanted) but for now, no.

Dam, broken link.

Dann

It's from Finland ;)

crazy finns

we are used to drive fast lightweight rwd cars:

Turbo -> water-to-air intercooler -> rotrex -> front mount air-to-air intercooler -> throttle body. Profit?

why the w/a interheater?

Wouldn't it be more efficient to cool the charge coming off the turbo as it generates a warmer charge than the rotrex? If not delete my posts since I could be going full-retard right now.

Yeah it would help, but due to how little the Rotrex heats air up compared to turbos it will only be marginally hotter. Coupled with a quality intercooler (likely upgrading to the 600hp Precision) it will be fine.

What kind of post-compressor temps are you seeing from the Rotrex? I can't find anyone that's actually logged it. I'd be great to have the datapoints...

I'd have to go find some old logs. Give me a few minutes I'll see what I can find.

Just so I have this straight, you're planning on running somewhere between a GT2554 and a GT2871, and blowing directly into the rotrex, with the pressure between the turbo and the rotrex being ~10psi at the low end, and 5-6psi at peak power?

If this is accurate, you are going to need some sort of secondary inlet to bypass the turbo going into the rotrex, or you will have to significantly overspeed any of the turbos you mentioned to get the mass flow rate at the PRs you are talking about. While you should easily have enough exhaust gas to drive the turbo that fast, you'll be getting into the territory where a wheel bursting is a real possibility.

And also how do you plan on the compressor housing of the turbo not choking the rotrex?

Dann

I do love the twincharging idea, but whenever I've thought about it, it seems like it's really best implemented on a bigger engine, which probably wouldnt need it anyways. The sizing with engines this small seems like it could just be a surging nightmare to find the right fitment...but if VW can do it from the factory, there's obviously hope.