924Board.org

[Dutch924-racer]

I have a Dansk exhaust, but the noise is pretty standard. For track use I am lookign for a bit sportier sound.

Has anybody have experience with loosing the mid or rear silincer(or both ?)



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937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller

[fiat22turbo]

I just run a cat and a rear muffler with only header. It sounds pretty nice.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[Carrera RSR]

Here's a video I prepared earlier of my SS Dansk and stainless middle section without centre box. Sounds alright?

http://youtu.be/oB5w4yf2e0k
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

[ideola]

The Club Sport has a straight pipe from the turbine housing all the way back to the exhaust, so no cat, and no resonator. For mild street driving, it's louder than stock but not bad. But when you tromp the throttle and get up into the 4K+ RPM range, it sounds pretty savage at full voice.

I'm just using an OEM muffler, so I wouldn't consider the sound to be tuned or refined...I'm sure there's more that could be done with a different muffler setup to refine the sound.
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erstwhile owner of just about every 924 variant ever made

[924RACR]

What size pipes are you guys using?

I've heard nice things can be accomplished with respect to noise and power if you dump the outlet from the wastegate separately (instead of back into the main exhaust)... maybe you guys are already doing this if you've removed the cats?

Regarding experimenting with different mufflers... I do have one or two race mufflers laying around, we could try experimenting sometime... but we'd need to perhaps make some adapters in some cases.

One is a very large Magnaflow, probably too quiet... the other two are on my prototype/sports racer, both straight-through... one's a low-end cherry bomb style, the other's an expensive Burns stainless race muffler, low restriction...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[morghen]

I have a 60mm diameter straight pipe in the garage...made it up for fun. I cant use it tho...its too loud for my taste.
Like Dan said, for granny style street driving its okish...but open the throttle and you're in trouble.

Drove it at 6000RPM with that straight pipe....i could not hold my jaw shut because of the vibrations it made..its THAT loud. I remember my teeth slipping on eachother from the vibrations...and my hands feeling a bit numb after a short drive.

Will add a resonator and mufler to it and use it on the blue RHD car one day...but never as it is now.

As a reference, here is my factory ROW 924 turbo exhaust with a side pointing 70mm diameter mufler tip.
https://www.youtube.com/watch?v=_OHH-AMlxVo
Downpipe is factory: 70mm
Mid section is factory: 60mm
end section is factory: 55mm
mufler tip is made: 70mm
confirming measurements is required as these are just values i remember.
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Supercharger and EFI kits
https://www.the924.com

[Carrera RSR]

The pic in the first post is the exhaust I have recently bought. I'm moving the rear section on but keeping the front and rear straight through sections

The front section opens out to (iirc) 3'' straight off the turbo and then tapers back to 2.5'' at the joint with the rear. The rear is 2.5''. I'm going to use a screamer pipe off the wastegate. I think the exhaust will sound OK but the open wastegate may be too loud for my taste. I'm going to fit it Jan/Feb so we'll see.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

[Josh931]

Carrera RSR how is that screamer pipe coming on?? Feb is almost up!![/quote]
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1990 Suzuki J410 sold
1985 Alfa Romeo 2.L GTV sold
1992 Honda VFR400 written off
1980 Porsche 931 going strong,,,well sort of

[Carrera RSR]

That was a year ago! Lasted just a few days before plumbing it back into the exhaust. Sounded aweful. http://www.924board.org/viewtopic.php?t=34690&postdays=0&postorder=asc&start=345
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252