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Fabio- Should have a wonderful sound.
 
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Discussion Starter · #105 ·
Hello friends,
today i went to the my friend that gave me the 599 for scanning two years ago because he have a GTO engine complete of headers, he was kindly to give me the headers because i want like to compare the external dimensions of the CAT with my CAT, now are to 3D scanning.
I will need to do a system for the RHD car and i have not the car, then if the envelope dimensions of my will be as those of GTO for sure can be install both LHD & RHD car.
Those GTO cats are very clos eto the engine, in the right side it touch the heat shield of the oil filter, and the rear external edges are a little bit polished, then i think was very close (or in touch) to the heat shields of the body.
The GTO headers are good manufactured, also if some pipes are crushed (by hydroforming) wiht the except of the connection to the CAT, this point have not a good design ...
In the last pictures my header installed on the engine.
 

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Fabio- Yours look a lot more artistic. The original ones look like a worm farm (folks grow them here for fishing).
 
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Fabio,
Great work and I am sure I will be tempted to buy soon. Can you explain why some people use equal length headers and how this influenced your design, I am sure you have researched this,
Ron
 

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Discussion Starter · #109 ·
Fabio,
Great work and I am sure I will be tempted to buy soon. Can you explain why some people use equal length headers and how this influenced your design, I am sure you have researched this,
Ron
Hello Ron,
Thanks fo ryour appreciation.
I did the manifolds 6-1 equal length mainly for have a better sound, in second way, specially in the 575, i obtained good power gain, all without ECU's modification.
The manifold design 6-1 (as the 4-1 for the V8) make a shrill sound due to the way ho the frequency of each cylinder it add up, each pulsasion are equal spaced in the time and result is the maximum frequency can be obtained.
If you have different pipe lenghts (the the sum of the frequencies it is driven by Fourier rules), the single frequency in the merge point are not equal spaced but have diffrent phases (time) , the result is an armonic with pulse and beats where some frequency are reduced and other amplified.
As example, frollowing a picture that shown the add up of diffrent frequency.

Best Regards

Fabio
 

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Fabio,
Thanks for the explanation, as a mathematician I appreciate how the Fourier summation is working. Do you mean amplitude summation at the same frequency rather than frequency summation ? Anyway looks like you have done some flow simulations on the computer. The end result is faster flow/better flow rate maybe with some scavenging effect? Yes I can hear the F1 sound in your videos, I may need to tone that down a bit for the wife and neighbors, should I keep the stock mufflers? And use the H-pipe?
Regards,
Ron
 

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Ron- The whole idea is to get better scavenging with equally spaced exhaust pulses throughout the exhaust system, with the resulting partial vacuum created pulling out the exhaust products. Without equal length tubes, the exhaust pulses step on each other and reduce efficiency. Chemistry and math here.
 
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Discussion Starter · #113 ·
Hello guys,
for some customer the exhaust of the 599 with the 6-1 manifolds and secondary cat bypass pipes is too loud in some conditions, i mean when bypass are open and over 4000 rpm, thing that in the 599 GTO is not present, and also not noticed from my customers that purchased from my a full exshaust for their 599.
The reason, in my opinion, it's due to the design of the 599 gtb mufflers in respect to the GTO mufflers, and the internal design of my mufflers maybe it make approx the same effects that the GTO mufflers.
A customer (friend) of Germany tha tpurchased my maniflods catalyzed, and had installed secondary cat bypass pipes and stock mufflers asked me if i could manufacture two small silencers to install in the place of the secondary cat bypass pipes.
I do it and for him result are great, car it's alittle bit less loud but sound it's countinue to be like a F 1 tone, in his impression it's apprx like the 812.
Followings some pictures of these silencers.

Best at all

Fabio
 

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Discussion Starter · #114 ·
I'm very happy of the appreciation by my customers about the 599 manifolds, now i'm manufacturing of the sets sn. 021- 022- 023, one of these it's for a guy of Dallas that know my first customer of the 599 that purchased on 2018 my first system (a full cat system), he is still running with my exhaust, and it's happy ....
That's make me very happy, Thank John.

About the 20 systems actualy running, one is in taly and all the other are around the world and the percentage catless is the 40% of the total.

Best regards at all

Fabio
 
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