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Registered User
Join Date: Oct 2015
Posts: 95
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modifying dansk sport muffler
Hi Gents
Just got my car back from the dyno and they said my muffler is restricting some ponies. 2.7 stock with SSIs and Dansk 1 out with itbs and efi (167hp at wheels) I really enjoyed this thread and wonder if I could modify my dansk to a 2 out? Would the internals be similar to the old 2 outs? Sport Muffler v2.0 wouldn't mind a bit more volume, but would like to avoid drone of course Thoughts?? |
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01-10-2019, 04:28 PM
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Registered
Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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Can you share the plots?
My butt dyno says I have a flat spot around 5000 rpm. I’d be curious to see your 2.7 behavior from 4000-6000 to see if the SSI and dansk 2-1 sport muffler shows a torque dip in that range. That’s what I feel. Be interesting to see if you have one too Connecticut, winter, no dyno for me until April 🙁 |
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01-10-2019, 04:35 PM
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Registered User
Join Date: Oct 2015
Posts: 95
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Currently 40 degrees C here in Adelaide (?104 F)
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01-10-2019, 04:39 PM
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Registered
Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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Wow. That’s hot, even for us in July. At least you can drive. 😉
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01-10-2019, 04:42 PM
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Registered Minimalist
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Drone is tough to avoid. It sort of goes with the territory on a dual out imho. For me, the drone happens at very specific RPM range which I would guess to be somewhere around 2-3k. Most of my driving is above that.
__________________
Duane / IG: @duanewik / Youtube Channel: Wik's Garage Check out my 75 and 77 911S build threads |
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01-10-2019, 04:57 PM
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Once a friend of Cliff
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are you running the original CIS system? it would make sense if you were tuning carbs or a contemporary efi system to get on a dyno. seems like if you dyno'd with the limited tuning of the CIS intake you might have had a second muffler there for install during the session.
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78SC PRC Spec911 (sold 12/15) https://www.youtube.com/watch?v=f7I6HCCKrVQ Now gone: 03 996TT/75 slicklid 3.oL carb'd hotrod 15 Rubicon JK/07.5 LMM Duramax 4x/86 Ski Nautique Correct Craft |
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01-10-2019, 07:01 PM
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Registered User
Join Date: Oct 2015
Posts: 95
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No CIS, EFI with ITBs hence the dyno
Im curious before I cut the thing open, what the internals look like. Anyone know if a dansk sport is similar to the old factory 2 outs? Maybe its better to buy a dansk sport 2 out muffler (or the redesigned mk)and sell old one? Sounds like a fun project though, but I have to admit, I hate drone. I realise this is an issue with 2 outs, but the dansk seem to be less offensive than others?? |
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01-10-2019, 07:34 PM
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Registered
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Muffler Guts
Not sure how similar the Dansk 2 in 1 out is, but here's a link to some 1 in mufflers with the tops cut off & made into 2 out:
SC, Carrera Bischoff Muffler Modification, Mod, Gut, Gutting, Dual, Two Out Mine sounded great BTW, Good luck,
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Don "Gordo" Gordon '83 911SC Targa |
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01-10-2019, 07:48 PM
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Registered
Join Date: Dec 2014
Posts: 13,954
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Quote:
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01-11-2019, 05:31 AM
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1975 Porsche 911s
the 23 car
domino
