Different pulley sizes for c30-94 Rotrex... - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-21-2016, 12:42 PM   #21
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If you don't do your research before spending money, you'll always spend more.
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Old 04-21-2016, 10:57 PM   #22
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So Gary is finally selling his Rotrex kit? $3400 got you what parts exacty?
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Old 04-21-2016, 11:07 PM   #23
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I think the C30-94 should be fine on a stock engine as long as you get a good tune. It's what I would run... though it's not something you can just slap on and forget about. If you are hitting too much power then you can throttle the Rotrex back by either dropping a restrictor into the intake which will limit peak boost / power, or install a recirc / BOV to vent the boost. Either way it's something I would do after you've got it on a dyno and had a play. Given the turbo power some people are running on stock engines, the Rotrex should be far more forgiving to stock rods and stock transmissions as it's power curve will be more linear.
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Old 04-22-2016, 08:19 AM   #24
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And you did that while you are active in a forum that's called miataturbo?
Blasphemy.
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Old 04-22-2016, 11:07 PM   #25
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Quote:
Originally Posted by Chilicharger665 View Post
So Gary is finally selling his Rotrex kit? $3400 got you what parts exacty?
The whole Kraftwerks c30-94 kit... except he didn't include the injectors or fuel module, which I was going to sell. And the piping looks used.. .but I'm not using it either.
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Old 04-22-2016, 11:08 PM   #26
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And much to my surprise, the blower came with a 105mm pulley lol. so extra safe.
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Old 04-22-2016, 11:50 PM   #27
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Wait what? You got a Kraftwerks kit from TDR?
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Old 06-20-2016, 10:39 AM   #28
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Originally Posted by patsmx5 View Post
You'll work the SC harder ,make more heat, and make more boost at lower RPMs, and need a heavy bypass system in place. I did this, it sucked.
by heavy bypass system you meant wastegate, right? why did it suck then? I've been reading post where ppl recommand it ..

well aside from setting up a wastegate, is there another way to restrict boost at higher rpms?

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Old 06-20-2016, 01:30 PM   #29
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Quote:
Originally Posted by miatanewbfan View Post
by heavy bypass system you meant wastegate, right? why did it suck then? I've been reading post where ppl recommand it ..

well aside from setting up a wastegate, is there another way to restrict boost at higher rpms?
A bypass system/wastegate, yes. It explained why it sucked in my post you quoted. More heat, working SC harder, more weight, more complexity, less reliability. I would guess those recommending it have no real world experience with it, I do.

A restrictor will restrict boost at high RPM, that's a common approach that's simpler/lighter/easier/more reliable.
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Old 07-23-2016, 08:37 AM   #30
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Quote:
Originally Posted by Madjak View Post
I think the C30-94 should be fine on a stock engine as long as you get a good tune. It's what I would run... though it's not something you can just slap on and forget about. If you are hitting too much power then you can throttle the Rotrex back by either dropping a restrictor into the intake which will limit peak boost / power, or install a recirc / BOV to vent the boost. Either way it's something I would do after you've got it on a dyno and had a play. Given the turbo power some people are running on stock engines, the Rotrex should be far more forgiving to stock rods and stock transmissions as it's power curve will be more linear.
I wish I could end up with the mods you describe!
My first choice was the Trackspeed Turbo kit but after waiting for many months it is still not all there so I turned to the TDR Rotrex. I asked Gary about some combination of restrictor - pulleys - bov but he said that he can't (won't ?) help with any of that, "his kit comes only one way" and I guess that's that.
I want to move the torque curve down and forfeit top end HP on my stock 1.8 but the Rotrex landscape confuses me.
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Old 07-24-2016, 11:45 PM   #31
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Trust me, TDR kits are quality.

Don't complicate the install. His kits (the street version kits) are for an otherwise stock engine. Oh I keep forgetting they don't come with good engine management. Just get a megasquirt from Brainiack. or whatever pnp ms you can find for your car.
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