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Rotrex C30-94 or C38-61

Old 11-05-2015, 02:53 PM
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Not overkill. 1.2 bar at redline. Need cams and headwork.
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Old 11-05-2015, 06:54 PM
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Originally Posted by arildh View Post
Not overkill. 1.2 bar at redline. Need cams and headwork.
Rotrex C38-61 on a 2004 Mazdaspeed Miata - YouTube
Any idea of the whp in this video?
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Old 11-06-2015, 02:51 AM
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Not really. 18 deg timing on top, 11.7 AFR, IAT +30C from ambient. Wiseco 9:1 pistons.
I had it setup with a waste gate to bleed off boost but never needed it. It was comparable to my 3071 setup above 6K but hard to tell when bost (and tq) follows the rpm. Maybe 300whp ?


Attached Thumbnails Rotrex C30-94 or C38-61-80-egt_b602ddbce3d0707eb9cc83eb464a8cf5429014a0.png  
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Old 09-19-2018, 11:21 AM
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Congrats Lincoln Logs! Those are good numbers for a c30-74. With that and your aero it’s a perfect track day car.
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Old 09-19-2018, 11:52 AM
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Originally Posted by k24madness View Post
Congrats Lincoln Logs! Those are good numbers for a c30-74. With that and your aero itís a perfect track day car.
Thread Necro!
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Old 09-19-2018, 04:46 PM
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Originally Posted by BustedKnuckles View Post
Thanks to a former NB owner running a C38-61, I'm now in possession of his old setup. Will report back in 2 years when up and running.
Okay- since someone "revived" this thread... I just got the C38-61 set up on E-85 about a month ago, so I was overly optimistic on the timeline, but not on the power output. Feels like a sport bike engine.
Attached Thumbnails Rotrex C30-94 or C38-61-20180825_154508.jpg  
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Old 09-20-2018, 03:41 AM
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Now that looks perky! Well done Busted Knuckles!

Boost levels?
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