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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 03-28-2012, 06:18 PM   #21
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so you're using the turbo for lowend and rotrex for topend. different from how its "normally" done but I can see it working
In for teh win. Falco mentioned this in another thread many moons ago, I'm hoping this is for the reals?
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Old 03-28-2012, 06:20 PM   #22
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so you're using the turbo for lowend and rotrex for topend. different from how its "normally" done but I can see it working
Yeah, more or less. I want to take the great efficiency that the Rotrex has in the upper RPMS and keep that as is. Adding a turbo to feed into the Rotrex. Thinking of running a big wastegate with it's vaccum source off the manifold for 20PSI or so. At lower RPMs the turbo would be boosting more, and lowering as the Rotrex comes into it's own. The large wastegate should be enough to keep the flow without choking the motor at the small turbine housing...


Anyways... this is still all int he planning stages and I have to figure out packing as well. Bottom mount but I don't know where to put the wastegate.
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Old 03-28-2012, 06:22 PM   #23
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In for teh win. Falco mentioned this in another thread many moons ago, I'm hoping this is for the reals?
Lol, yeah I did. I've been living in Germany for the last 7 months and am heading home this Monday. I am itching to get wrenching on something again and since the motor and Rotrex stuff is all done I need to think outside the box.

Right now though, I'm just trying to think of how much boost the motor can really take. 20PSI? 25PSI? Who knows... Crank it up and see? Lol...
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Old 03-28-2012, 06:25 PM   #24
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If you decide you want something bigger than that C30-94, I may know someone that's interested in your old one.
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Old 03-28-2012, 06:25 PM   #25
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Its built. Number of "PSI" is irrelevent. What is relevant is correct setup and tuning.

You can have the wastegate on top of the turbo if you're going bottom mount.

The torque curve shape should be interesting to see on a 1.6. I'm predicting an LSx replica.
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Old 03-28-2012, 06:26 PM   #26
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Haha, if anything I may go down to a 74. Right now the Rotrex is pushing 16PSI at 8k and with a turbo, even pushing only 5psi it would make 26-27psi at the motor which is a bit out of my comfort zone. We'll see I might just put a bigger pully on it and gear it down a bit.
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Old 03-28-2012, 06:28 PM   #27
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Haha, if anything I may go down to a 74.


I sense a pending trade in your future...
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Old 03-28-2012, 06:29 PM   #28
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Quote:
Originally Posted by 18psi View Post
Its built. Number of "PSI" is irrelevent. What is relevant is correct setup and tuning.

You can have the wastegate on top of the turbo if you're going bottom mount.

The torque curve shape should be interesting to see on a 1.6. I'm predicting an LSx replica.
Yeah, but there is the inlet to the Rotrex. It can't be completely blocked I need a bit of space to make piping from the exit of the turbo to the inlet of the Rotrex. And the wastegate needs to be placed where I can still route it back into the exhaust. I'm getting old and atmosphere dumped gates are no longer something I want... haha.

Going to take some measurements and see what Abe can come up with. If anything I doubt this being completed for a few months so don't get all excited just yet guys! :P

Oh and I need a job first... haha
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Old 03-28-2012, 06:32 PM   #29
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Your engine bay will look like a plate of spagetti
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Old 03-28-2012, 06:39 PM   #30
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Yeah pretty much.

For reference, what it "kind of" looks like right now, sans piping.

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Old 03-28-2012, 06:39 PM   #31
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You don't know what I'm doing

Lets just say that the motor will be seeing a substantially higher amount of boost than what the turbo will be pushing out.
4th Reich?

A turbo for low RPM, and a supercharger for high RPM is really going to confuse the super/failcharger crew. You should get a couple 60mm TiAL wastegates.
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Old 03-28-2012, 06:40 PM   #32
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What about having the compressor feed directly into the mouth of the rotrex?

...but then you might have supercharger surge ( LOLWAT)
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Old 03-28-2012, 06:43 PM   #33
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Why not just run a turbonator?
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Old 03-28-2012, 06:44 PM   #34
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^^ Thats kind of the plan, but there will be a blow off valve of some sort in there.

And Hustler, you know me... all about making people go "why the hell did he do that?"...

c'mon who else spends a ludicrous amount of money building a 1.6L motor then putting a Rotrex on it?
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Old 03-28-2012, 06:45 PM   #35
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people that wished they drove a honda
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Old 03-28-2012, 06:46 PM   #36
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Quote:
Originally Posted by hustler View Post
Why not just run a turbonator?

So I can put some boost in my boost, so I boost while I boost.

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Old 03-28-2012, 06:46 PM   #37
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people that wished they drove a honda
I hate Hondas.
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Old 03-28-2012, 06:47 PM   #38
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yet you replicated their power and torque curve
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Old 03-28-2012, 06:50 PM   #39
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In a RWD, light and much better chassis.
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Old 03-29-2012, 08:12 AM   #40
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hehe, look what I found. C30-74 w/ Holset HX40. 4AGE

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