bp944

iTrader: (4)

I am going to drop a ls1 into a porsche 944. I love the sound of muscle but i do want my car to be a sleeper. I think the only thing I've heard that makes it sound closer to a flat crank, exotic car is a 180 crossover header. My problem is the engine bay is very tight. I'm going to have to custom build the headers anyway but what would be the easiest route to go about doing this?

http://static.speedwaymotors.com/RS/.../9171801_L.jpg

Tainted

iTrader: (9)

They are making a flat plane crank for LSX motors now

-TheBandit-

iTrader: (1)

That is going to be a very tough project. You may want to check out Bend Tech Header Design software. http://www.2020softwaresolutions.com/bt_hd.htm

Really? Seriously? I'll believe it when I see it. Please post a link.

the_merv

iTrader: (88)

Looks like an octopus..

t/a98

iTrader: (6)

In for an answer. I'm going to do this when I build my gtm (one day). The headers pictured look like lt1 headers. I assume you posted the pic so other knew what a crossover header is though.. Ati made a few sets for the ls1 corvette. You can YouTube the video it's a sick sound. I don't think they still make them but maybe they could help you.

-TheBandit-

iTrader: (1)

180 headers have a unique sound that simulates that of a flat crank because the exhaust pulses into the collector are evenly spaced. I really like the way they sound, but they are very hard to package with reasonable and equal primary lengths and of course they end up looking like speghetti (sp?). Mid/rear engine cars tend to have more space for this sort of thing. If you can get it done in a 944, I will be very impressed. If you have a local dirt track, that is often where you will find these headers being used. If you're looking for performance, it's been demonstrated that standard long tube headers with an X pipe are just as good at developing power and a lot easier to package, but you don't get that exotic sound.

t/a98

iTrader: (6)

I think the 180 degree headers are a better option than a flat plane crank. I've read those cranks have vibration issues that ours dont. Plus you would have a different cam I believe.. It just seems cheaper and easier to do the exhaust than a crank and cam switch...

Tainted

iTrader: (9)

shazam, flat plane crank 358ci
https://ls1tech.com/forums/multimedi...gine-dyno.html






you dont need to switch a cam because of the crank

Andy1

My buddy has a 914 V8 track car with 180's. Yes, it certainly sounds a lot different than anything else on the track. Packaging those headers (Schoenfeld) would be impossible in the 944 short of some heavy body and chassis modifications like a tube framed stock car/dirt car.

Muscle car header manufacturers in the 60's went through a 180 kick which didn't last very long. They crossed over two primaries under the pan to get 180 degree headers, as I recall (on a SBC). I suppose you could do something similar once you get the phasing figured out, but it would be a lot of work.

Andy1

-TheBandit-

iTrader: (1)

Very cool. Thanks.

How would you avoid this? The lobe phasing would have to change so a different cam would be needed.

the_merv

iTrader: (88)

Ya a different Cam would definately be needed..Valve Events would be so fucked off with a standard LS Cam..I bet the Cam would look similar to the Crank..Flat Plane Cam.

Tainted

iTrader: (9)

Hmm I figured cam would be ok since I didn't notice anything in the crank thread mentioning deity hint cams or that they had even made a cam to sell with the crank

01cherryreds10

iTrader: (9)

That's pretty badass I had no idea you could even do such a thing to an LS engine.

bp944

iTrader: (4)

I want the sound and nothing else. The power gains would be like 5hp or less. I'm that desperate for that sound to go to a flat plane crank and loose so much power for a huge price tag. I also wouldn't be devistated if I lost 10hp from this exhaust just because the exhaust sound is wonderful. Does ATI do custom exhaust systems?

debreshnev

iTrader: (1)

Have you considered a frequency modifier muffler? These are used in some kit cars to get an exotic car sound. They basically double the exhaust pulses, they make a 4 cylinder sound like an 8 and a 6 cylinder sound like a v12, etc...
http://www.youtube.com/watch?v=LSy_3nnsZdg
http://drgas.mybisi.com/product/freq...difier-muffler

I am faced with a similar problem, I am working on putting and LS2 into an old Ferrari (62 250 GTE) and have been trying to find ways to change the sound to sound closer to the original V12. I am planning on using these mufflers along with a camshaft that was recommended by Patrick Guerra to help reduce the LSx sewing machine sound.

bp944

iTrader: (4)

debreshnev, you are my hero. That is exactly the sound that I am looking for. Could you please record your exhaust when you have it finished? I'm probably going to copy it quite exactly except I'm going for a cam with power rather than for sound. Do you know of any ls1 videos with this exhaust in it? I want to know and hear how each setup is done.

debreshnev

iTrader: (1)

Here is the cam spec Patrick recommended.
222/226 .597”/.605” 114LSA +2 advance
Some of the cam specialist may speak up but I am pretty sure it will make plenty of power since this basic setup is known to be a really good performer in LS motors. I have a chassis dyno so I will find out what it makes when it is done. Currently working on the the custom headers, so hopefully I will not be to long before I get the results.

bp944

iTrader: (4)

I found out that spintech also makes something similar. I found more videos but here's the one I seem to like the most. I enjoy the fact that the idle is pretty calm. I'd rather my car not scream when I'm cruising down the highway at 2,500 rpm.

http://www.youtube.com/watch?v=1K9wce1aEOA

arthropraxis

What exhaust setup are you going to go with on the 944? I was planning on two into one with and offset in center out muffler. The DrGas and Spintech mufflers sound good.

Slow Motion Speed

I dont really don't see how with even the little space behind the intake and master cylinder where it is how 180 could even be an option especially as a sleeper? Huge hood scoop? Ha ha.
I got fed up with the options out there and came up with my own.
1 7/8 stainless long tube 3 inch long collectors. Ran 3 indual al the way back with a x pipe near the shifter then ran back to the original Muffler location where I put in a Magnaflow 2 1/2 inch 2 inlet 2 outlet crossover to give a little backpressure. Still very tame as a sleeper sound.