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Join Date: Jul 2003
Location: Glorious Pac NW
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K27 spooling noise question

So, got my car back on the road recently, after it spun a big-end. Whew, spendy.

Didn't avoid the "while you're there" trap, and rebuilt with GHL headers, K27/HF (and other goodies). Still running it in, and restricting both the amount of throttle and the revs for the time being. Apart from anything else, it's been pretty wet here recently...

One thing I've noticed - the stock paperweight would spool up and sound like an air-raid siren before getting into any serious boost, but the K27 with those headers gets into boost quite easily/soon with minimal throttle.

I've had the (factory) wastegate open more than once, but I have yet to hear the K27 at all - all I can think is that because I'm hardly using any throttle, it's not spinning fast enough yet.

I miss the sound - can anyone with a K27 comment if they hear it spooling at all?

Thanks!
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'77 S with '78 930 power and a few other things.
Old 05-28-2007, 05:31 PM
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Crotchety Old Bastard
 
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What muffler are you running?
With a stock Euro muffler I cannot hear my K27 spool.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-28-2007, 06:17 PM
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Hi Brian,

Same here, stock Euro muffler; separate wastegate dump pipe.

Thanks!

Huh. I could hear the factory turbo spooling very clearly - over either the factory muffler or the appallingly loud open pipe that used to be fitted - usually before any significant power appeared. Maybe it was worn or something...
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'77 S with '78 930 power and a few other things.

Last edited by spuggy; 05-30-2007 at 05:12 AM..
Old 05-29-2007, 07:19 AM
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K27, stock headers, B&B muff...can not hear it spool up..muff gets pretty load on boost though!
Old 05-29-2007, 11:26 AM
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