snapped input shaft on Rotrex C38-81 - 8th Generation Honda Civic Forum
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Old 09-07-2013, 08:34 AM   #1 (permalink)
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snapped input shaft on Rotrex C38-81

ok i was driving home from dyno and thought it was a good idea to do an 4th gear wot. At 7300 i was cut by lean prot. and out of a sudden i heared a rattling noise from the front of the engine. today i found that the s/c compressor wheel wiggles around and has lots of play. C38-81 is fitted only 2 mounth and only 4-5k miles. anyone knows what is causing this?

From the datalog i can see that at 7300rpm the boost does down immediately while i'm still on full throttle and then lean prot. cuts the engine because it was in n/a region. revlimit was set at 7700. I'm running an Ep3 k24 with tts bottom Mount kit.

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Old 09-08-2013, 11:16 AM   #2 (permalink)
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here are few pics.







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Old 09-08-2013, 03:13 PM   #3 (permalink)
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Looks to very much be a manufacture fault on the shaft that has caused an imbalance and then a component failure. Just contact tts if that's where you brought the supercharger as well and it will get sent to rotrex for warranty claim.
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Old 09-08-2013, 06:41 PM   #4 (permalink)
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thx. bought it from komotec germany which is the distributor over here.

Last edited by rsamd; 09-08-2013 at 06:42 PM.
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Old 09-09-2013, 04:22 AM   #5 (permalink)
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As you are running a K24 are you running a K24 crank pulley? What dia supercharger pulley are you running.
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Old 09-09-2013, 05:01 AM   #6 (permalink)
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it was with k24a2 148mm cp and 95mm bp and a 7700rpm limit.
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Old 09-09-2013, 08:01 AM   #7 (permalink)
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Quote:
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it was with k24a2 148mm cp and 95mm bp and a 7700rpm limit.
That's on the money. Do you have a power curve you could show me?
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Old 09-09-2013, 09:36 AM   #8 (permalink)
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yeah here it is.

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Old 09-09-2013, 02:26 PM   #9 (permalink)
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OUCH

Is ROTREX going to Warrantee it..??
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Old 09-09-2013, 02:47 PM   #10 (permalink)
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duno, i hope it.
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Old 09-09-2013, 03:07 PM   #11 (permalink)
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If instead of looking for the max bhp which will always be at the limiter, its better to sacrifice a little at the top end and nose over the power so you feel when to change up a gear. This will stop you hammering into the rev limiter. These engine rev so fast in the low gears its almost impossible to hook the next gear without hitting the limiter, nosing over the power and giving you a warning will mean faster acceleration as you will change gear at the right time and in the process be a bit more sympathetic to the supercharger. A turbo makes its power much earlier then goes flat at the top end and you know its time to change, with the supercharger you need the same feeling. I think all Rotrex superchargers should be set up this way, there is no point in having peak power on the limiter, you can't use it.
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Old 09-09-2013, 03:17 PM   #12 (permalink)
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Rev limit aside, doesn't his power curve look very similar to yours (peaking around 7700rpm)? Are you suggesting that he simply raise the rev limiter to keep from bouncing off of it?
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Old 09-09-2013, 03:33 PM   #13 (permalink)
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i would say if you hit the limiter all the time you don't know how to drive. i usually shift at 7500-7600. I was driving home 2hours and never hit the limiter till it snapped. i'm running a forge 007p bov as i want it as quiet as possible when cruising down the road. mabe i add my tial q 50mm for savety if its nessessary. but its loud as f'''' on a rotrex.
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Old 09-09-2013, 03:43 PM   #14 (permalink)
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Quote:
Originally Posted by rsamd View Post
i would say if you hit the limiter all the time you don't know how to drive. i usually shift at 7500-7600. I was driving home 2hours and never hit the limiter till it snapped. i'm running a forge 007p bov as i want it as quiet as possible when cruising down the road. mabe i add my tial q 50mm for savety if its nessessary. but its loud as f'''' on a rotrex.
Agreed on the rev limiter point. I'm just trying to better understand his position. Anyways, good luck with the warranty. The lack of serviceability of the rotrex scares me.

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Old 09-09-2013, 04:10 PM   #15 (permalink)
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Quote:
Originally Posted by SupNinj4 View Post
Rev limit aside, doesn't his power curve look very similar to yours (peaking around 7700rpm)? Are you suggesting that he simply raise the rev limiter to keep from bouncing off of it?
The example is a 2 litre so revving higher, it's just the curve I was showing.
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Old 09-09-2013, 04:22 PM   #16 (permalink)
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Quote:
Originally Posted by rsamd View Post
i would say if you hit the limiter all the time you don't know how to drive. i usually shift at 7500-7600. I was driving home 2hours and never hit the limiter till it snapped. i'm running a forge 007p bov as i want it as quiet as possible when cruising down the road. mabe i add my tial q 50mm for savety if its nessessary. but its loud as f'''' on a rotrex.
Do you have standard 2 litre gearing? The car as standard is stupidly low geared and cruising in Germany is probably moving along a bit you could do with a 50% overdrive. 6th. With all your power. We have high power civic's here and they are not right for everyday use. It just seems all wrong to scream it at 6000plus rpm for hours. I'm sure you know where I'm coming from. But if its your only mode of transport you have to do what you have to do. It doesn't excuse it breaking. Send it back to Komo tec and go from there.
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Old 09-09-2013, 04:24 PM   #17 (permalink)
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Agreed on the rev limiter point. I'm just trying to better understand his position. Anyways, good luck with the warranty. The lack of serviceability of the rotrex scares me.
Not a problem. If you are a Rotrex customer of TTS's then we will supply you a new unit at 50% discount on an none warranted failure. This would probably be cheaper than a rebuild.
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Old 09-09-2013, 04:34 PM   #18 (permalink)
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I actually fitted a 4.3fd along with oem edm ep3 gears. Its much nicer on a k24 now. but had to change it anyway because i broke 4th gear on my itr jdm tranny. :/
But on public roads at 65mph in 6th its like driving through a River with the tial q bov.
I think the rotrex units are great and most customers run them without issues. But people dont post in forums if they run without issues. you know.
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Old 09-12-2013, 07:26 PM   #19 (permalink)
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So on these c38s they self destruct if you hit the limiter? What about launch control limiter?

Was talking to someone that said a guy broke 3 c38s until he stopped hitting the limiter. (They increased the limiter and shifted before it) my worry is during wheel spin hitting the limiter or what about VSA kicking in?

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Old 09-13-2013, 05:56 AM   #20 (permalink)
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I'm not an expert for materials but look where it broke. there's a dark grey area in the middle that goes half way through the cut. shouldn't this be shiny pure metal?! looks like some metal impurities in the shaft.
and i think if somthing breaks it should be the impeller with its thin blades, not the ~10mm billet shaft.




Last edited by rsamd; 09-13-2013 at 05:57 AM.
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