Built 1.6L C30-94 Rotrex 14.8PSI peak - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-30-2011, 05:56 PM   #1
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Default Built 1.6L C30-94 Rotrex 14.8PSI peak

Pull was done on one of those fancy new eddy current dynojets.



AFR's in the 11.5-11.7 and boost peaking at 14.8PSI at 8000RPM. 91oct Chevron

Last edited by falcon; 07-31-2011 at 03:51 AM.
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Old 07-30-2011, 05:59 PM   #2
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Good stuff man, looking great.
So smooth, and nearly 300 aint no joke. FFS kru can only wet dream about this much power

why'd you start the pull so late though? I know it doesn't make much hp/tq that low anyway, but still.

PS: this setup will probably be hands down fantastic on the track
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Old 07-30-2011, 06:03 PM   #3
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Interesting. How does it feel to drive since the power comes on kinda late? I bet it's murder up top. Congrads on the power.

18psi, you edit your **** so much it's hilarious!
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Old 07-30-2011, 06:07 PM   #4
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With the 13's it's almost perfect. Once I go to a 3.9 final drive and a 6 spd it will be perfect for what I want. It's basically only a track car and I'm never below 5kRPM. It's a whole different style of powerband, and I encourage you guys to try to get a ride a long in somones Rotrex'd car at least once. It may not be your thing but check it out.

It's fast. It pulls hard all the way to 8k with no hints of falling off. I can only thank GotPSI?'s intake manifold for that. No way the powerband would look like it does with a stock manifold.


As for the pull, I don't know I didn't do it. It was really cheap to do the pulls so I'm not complaining. You're right it makes **** all down there.

In for trolling the FFS cr3w.
http://forum.miata.net/vb/showthread...00#post5294000
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Old 07-30-2011, 06:10 PM   #5
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Quote:
Originally Posted by viperormiata View Post
18psi, you edit your **** so much it's hilarious!
My fingers type faster than my mind can process my thoughts

*edit: BRO
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In for the gangbang
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Old 07-30-2011, 06:11 PM   #6
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Im sure it would be pretty win if the gearing is close enough
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Old 07-30-2011, 06:12 PM   #7
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I shift around 7500-7800 and revs don't fall below 5k. So I'm always in the powerband.

Another plus about this set up,... I am running a 5pd and I don't need to worry about it blowing up
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Old 07-30-2011, 06:17 PM   #8
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Last edited by 18psi; 07-31-2011 at 03:53 AM.
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Old 07-30-2011, 06:23 PM   #9
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I think if I can manage this twincharge thing I've been thinking about to produce more torque down low it will be a pretty badass set up.
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Old 07-30-2011, 06:38 PM   #10
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I think if I can manage this twincharge thing I've been thinking about to produce more torque down low it will be a pretty badass set up.
That sounds like a fitment nightmare, haha.

I would rather put a wastegate on the centri, assuming that you can spin it up higher safely.
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Old 07-30-2011, 06:45 PM   #11
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I can't I'm already at it's max at 7900RPM. I just revved it to 8K a few times on the dyno. On the street/track the limiter is set to soft cut at 7800RPM.

With a bottom mount manifold it wouldn't bee too hard. I've looked at the space it's do-able.
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Old 07-30-2011, 06:54 PM   #12
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I mean the speed of the supercharger, unless thats what you also mean, in which case Im sorry we both suck so hard at communicating
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Old 07-30-2011, 07:06 PM   #13
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Yeah. The Rotrex is geared to it's max RPM already. So unless I lower my RPM limit I can't run a smaller pulley. 15PSI is enough anyways...

With a small turbo spooling 8-10PSI down low to add some torque and feeding the Rotrex inlet it could be interesting.

There is a guy with a 4AGE running a HX40 and a Rotrex, but the Rotrex feeds the turbo. I sent him a message on youtube to try to get some more information.
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Old 07-30-2011, 08:29 PM   #14
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I would have the turbo feeding into the rotrex. In this configuration you would not be limited by the compressor of the rotrex as much. Youll be able to run a relatively big turbo and still spool quickly due to the supercharger, but thats just a little bonus.

The real reason to run in this configuration will be that the supercharger will be offsetting the pressure difference between the intake manifold and exhaust manifold. In other words, there will be improved exhaust scavenging which is interesting since poor scavenging is the bane of any serious turbo setup. With better scavenging you will be able to run more aggressive timing, be less prone to detonate, and will thus make more power.

This is all dependent on how much work each compressor does though. You can keep scavenging very high with your current pulley ratio and have the turbo only adding a little boost up top, or you could lower your ratio and try to get the turbo and rotrex closer to their efficiency island at the cost of scavenging and possibly a little bit of spool.
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Old 07-30-2011, 09:24 PM   #15
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falcon, why is the torque so low?
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Old 07-30-2011, 10:18 PM   #16
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It's a Rotrex.

Go look at any 1.6L boosting 13-14PSI and see what their torque is at 8000RPM. Since I am only boosting 5-8PSI in the midrange where most torque is picked up with boost, that's why it's low.

Nothing I wasn't expecting.
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Old 07-30-2011, 10:19 PM   #17
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Quote:
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I would have the turbo feeding into the rotrex. In this configuration you would not be limited by the compressor of the rotrex as much. Youll be able to run a relatively big turbo and still spool quickly due to the supercharger, but thats just a little bonus.

The real reason to run in this configuration will be that the supercharger will be offsetting the pressure difference between the intake manifold and exhaust manifold. In other words, there will be improved exhaust scavenging which is interesting since poor scavenging is the bane of any serious turbo setup. With better scavenging you will be able to run more aggressive timing, be less prone to detonate, and will thus make more power.

This is all dependent on how much work each compressor does though. You can keep scavenging very high with your current pulley ratio and have the turbo only adding a little boost up top, or you could lower your ratio and try to get the turbo and rotrex closer to their efficiency island at the cost of scavenging and possibly a little bit of spool.
I can always throw my old pulley back on which would be say... 12PSI ish at 8K RPM with the current intake mani and boost a very effiecient turbo to 10PSI. That would make for a pretty potent set up.
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Old 07-31-2011, 03:51 AM   #18
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I guess I forgot to mention that this power is on 91 octane. Not 100 octane race gas like trackdayhookeys car.

If I dumped my rev limit to 7k like his and geared the Rotrex accordingly and added 100octane race fuel I'm sure the car would be well into the mid 300's.

Hmmmmmmmm.....
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Old 07-31-2011, 10:34 AM   #19
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Well I bet once you get going its fast!

JK JK
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Old 07-31-2011, 03:42 PM   #20
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Your car must have the smoothest power delivery of any miata, I wish you where local so I could drive it and feel the difference between your rotex, and my turbo set up since our motors are build so similar. its awesome to see the power and torque building from 3200 rpm and still climbing at 8K. Thanks for putting on the dyno.
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