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fezza575m · Posted: Sat Nov 01, 2008 10:54 am Post subject: Exhaust systems??

In the next couple of weeks i will be getting a new exhaust system on my toofah...looking to make it sound a bit meatier and match the CGT looks

Just curious to see what some of you have on your cars and if you could recommend a particular set up?
Also if anyone has any sound/video clips that would be great!

Cheers,
G
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Red 1977 Porsche 924 CGT...THE MORPH IS COMPLETE

Meneer aard · Joined: 27 Jan 2006 Posts: 73 Location: Netherlands

first thing to do is removing your centre muffler..replace is with a slightly bigger pipe..sounds great.

today i have installed a 4-2-1 header on my 924..:

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Porsche 924 Euro 1977

elitejaso · Joined: 24 Jul 2007 Posts: 143 Location: Melbourne

After removing your cat Meneer how did your car perform, better or worse? How much back pressure do these cars need to perform?
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1981 924 turbo (daily driver)

fezza575m · Posted: Sun Nov 02, 2008 9:52 am Post subject:

your car sounds good
hmm sorry for being such a noob to this thing but i have a few mates with 911's whos cars "crackle", something also that scorpios car does. I think it sounds great and would like to have my car doing the same.
Does anyone elses car 'crackle'?
Do you know what setup is required for this?
thanks

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Red 1977 Porsche 924 CGT...THE MORPH IS COMPLETE

StienbargerR · Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN

I have a turbo style muffler made by dynamax. i like it alot.. it is not too loud, but very sporty. On Hot days the exhaust crackles a little bit, if you downshift or rev it up real quick.

Ryan
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1978 924 NA
-250lb lowering springs, Euro Pistons

924RACR · Posted: Sun Nov 02, 2008 9:58 pm Post subject:

The crackle or popping is typically due to running hot/lean - can be timing as much as fuel adjustment.

It'll typically occur on cars with not the best fuel control systems - lesser EFI systems, and carbs, for example - that dump unneeded fuel out the pipe on lifts.

Our CIS system doesn't usually have this problem, so it's atypical to have much popping out the exhaust. I agree, it sounds cool as hell, but it isn't actually right to have such things happening...

Same goes for flames shooting out the tailpipe - as often seen on turbos and NASCRAP cars. Looks impressive, but personally I'd rather be burning that stuff inside my engine, where it'll make power! There's a reason it's called an Internal Combustion Engine, after all...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

fezza575m · Posted: Sun Nov 02, 2008 10:09 pm Post subject:

thanks for your post....good points there

while what you are saying makes sense....it would be interesting to find out what set up scrorpio has..is it his exhaust system or fuel setup?
because his cracks and pops a fair bit

Also i was talking to a mate today who said that an aftermarket resinator can make a car do that...any truth??
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Red 1977 Porsche 924 CGT...THE MORPH IS COMPLETE

Scorpio · Posted: Sun Nov 02, 2008 11:43 pm Post subject:

ill double check under the car tomorrow..but it was definately not running lean or hot..the CIS was in great condition

Mine runs a split system about halfway under the body there is a Y connection splitting the exhaust into two pipes...i have a feeling the secondary muffler(think thats what its called) was removed.

Sounded like an apache helicopter on roids!!
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1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

I think that no matter what you do you will only gain a few HP. I tried them all. I liked the split downpipe with duals the best but it was too loud for NY and an old guy like me. I did not want the attention as my motor would not pass inspection if I got stopped.
You should really think of what you are trying to achieve as to sound, back pressure or looks.
I liked the sound and the looks of duals with Suppertrapp caps on the ends that you could move the power curve around a little. Add plates to make it louder or remove them to make it quieter. If you look at the pics Peter entered this past week of my car you will see what I mean.

For the cost of a different exhaust I would put the money in the suspension. Then again it is only my opinion.
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

Meneer aard · Joined: 27 Jan 2006 Posts: 73 Location: Netherlands

Paul · Posted: Mon Nov 03, 2008 4:00 am Post subject:

I would wrap all those wires with something to protect them from heat.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Firesleeve is cool. . .my battery cables are wrapped in it.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

What gauge are the spark plug wires? They seem thin. I run 8mm.
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

fezza575m · Posted: Tue Nov 04, 2008 6:02 pm Post subject:

fezza575m · Posted: Tue Nov 04, 2008 6:14 pm Post subject:

Here is an Idea of what i would like my car to sound like...i know this is a 924S and doesnt use the same engine

but is it posible for my car to sound something like this one??
http://www.youtube.com/watch?v=d7CT_MtUTiQ

Cheers
G
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Red 1977 Porsche 924 CGT...THE MORPH IS COMPLETE