So, what header sources are there besides IA, EVO and S-Car-Go??

 

Off the wall question- if one impact caused that much damage, did any other engine components sustain any damage from compression when the headers struck the pavement? I'd have to guess that the impact had to be quite severe...

 

Ken, please check your suspension components real well!

That's a big bif.

 

I say just grind off the flat spots and weld in ski, er I mean skid plates.

 

Porsche stock. That's what Ruf uses.

 

Wow, could finally see the pic. Hope you have the entire rig a good looksy. Hopefully the motor mounts did not sustain damage, I am sure you checked...

 

I'm surprised I don't have the same damage

Yeah that was a damage filled day: your headers and my Techart front and clutch!!!!!!!!!!!

Just add time and money and it will be all good again

I guess it comes down to we want to play we are going to pay
Expensive week for us huh Ken

 

Bill,
With all due respect of course, if you look at the Porsche exhaust manifold design, it really is not good.......err......a compromise. Remember, we are talking about a road-going production car wherein the company (Porsche) wants to import as many examples for sale as possible. Imported gross fleet emissions play a big role here. Make your cars emit less, and import more cars. Therefore, I am sure the stock manifold is a compromise from this persepctive alone.

If that doesn't convince you, look at the exhaust gas velocity vector and you will see, for example, the number 1 exhaust gas pulse comes to an intersection and can either go to the turbo or go up the exhaust manifold pipe of the number 3 cylinder!!! Definitely not ideal in my book.

As I said earlier, personally, I would rather have the gas directed straight at my turbo via the pyramidal collector that is found on all high performance racing exhausts. In addition, keep the pipes equal length and short for our turbo cars since we want to reduce the time it takes for the gas to exit the exhaust port and reach the turbo to spool it up.

It is simple common sense to me.

 

Hi Ken, I don;t know what other mods you have, but I
have yet to see any dyno charts (espeically for any
near-stock cars) that shows any gain from aftermarket
headers. I would want to see a test where the car is
chip-tuned to the stock headers, and then the headers
are swapped and a retune, just in case it would affect the tune.

For turbos, the most important thing is to keep the paths
between head and turbo as short as possible and losing
as little heat as possible. Gases are (for their weight) very
viscous, so if they're pointed mostly toward the collector,
that's the way they'll go. Minor angle differences aren't going to
make a difference I think. Sotck headers are partially insulated
but I know of no aftermarket headers that are...
In fact, I would like a stage 4 GT setup except that I'd use
the modified stock headers, and a custom dyno tuning session
to make sure it's dialed in.
Joe

 

exhaust gas velocity vector!!!!!!!!!!!!!!!!!!

Dude... you need a girlfriend...FAST!!!!


E

 

thats what happens when you buy black instead of tortouise shell right erik

 

I'd think the mounts would take quite a beating as well



That's unreal that that all happened on one hit Ken

 

I can see your thoughts. Being an engineer, however, I agree with Joe above. Porsche has particle simulations and analysis that is far beyond anything we can imagine here. That includes simulation for standing waves and resonance with all disturbances in the airflow considered at all RPMs and loads (the introduction of the turbo in the flow makes the analysis very different than a normally aspirated flow). I agree that there may have been some small trade-offs for emissions and cost, but I doubt any aftermarket manufacturer will make a noticeable performance improvement given the rest of the OEM exhaust system. Some very fast cars, built by Ruf, Andial and RS Tuning all use the stock headers.

If you want to go crazy, look at the systems used on the GT1 race cars. There was no compromise for performance. For example, here's the exhaust for a 935 (detuned for street only with silencers):

 

Can you guys speak English please I am but a poor trucker for goodness sakes!

PS: Ken, let's see a picture of Daisy!

 

On the 520/550 engine yes Ruf use the stock header, but not on the Nardo engine or the new 650. These engines get absolutely gorgeous Ruf custom headers.

Guy