De-cat a F50

Back pressure is not needed

Exhaust with Backpressure = Reversion, this is the start of all exhaust systems.
So at the stat of the intake stroke you have cam over lap and the gasses in you header are under high pressure causing the gasses to be pushed back into the cylinder causing a bad fuel/air mix.

Exhaust without Backpressure = Scavenging, This also starts at the intake stroke win you have cam overlap. The momentum of the exiting exhaust gasses creates a brief vacuum in the header, pulling out the remaining exhaust gases from the combustion chamber, and allowing the new fuel/air charge to be at its best

 

We have the full tubi system with the cats removed in our F50 now. If there is lost of low-end torque, I am unable to notice it. What I do notice is the improved thorttle response and of course the sound from the full tubi exhaust system.

 

We have done 2 F50s with full Tubi Tube. Both cars are much faster than stock forms. Especially under load from 2500-6000 rpm.

 

yimn - pictures please

 

Can we just see some pictures of your F50

Cats or not cat.

 

hmm...i can't find them...there are pictures of it posted in so cal crystal cove a few months back. been purging pictures off my laptop...i will take some next weekend, may be going to crystal cove.

 

Isn't it too loud with the full sytem? A former owner with the full system told me it was totally OTT.

 

I'm hoping this is a clip of F50 w/Tubi


http://blurbdesigns.fileburst.com/scuderiasystems/media/Dn5KKCbq/FF50-02.wmv

 

that's the point.. F50's are all about OTT !!

The Raftis F50 was an awesome noise. Yes loud, but not boomy as it had the full system. It's when you use only the rear boxes that they get boomy.

And the noise from the exhaust helps cover up the engine drive rattles......

 

The sound is pure F1; but there isn't much point if you get dragged off the track for being over the db limit, or pulled over by some PITA cop for noise pollution.......

There is a totally wicked video clip on the Tubi England site if people are interested.

 

It's here ;

http://blurbdesigns.fileburst.com/s...Cbq/FF50-02.wmv

 

I guess it's matter of opinion and taste. The first F50 we bought years ago had Tubis and we loved it. the 2nd one didn't and we missed it. Then we decided to get a black one so we sold it took a long time to find 1 of 3 in the US. Then it took a long time to get a new set of Tubi for F50. The black didn't look very good to my friend, so we sold it and couldn't find another for a long time. (They started to reach the $800k mark) So we brought in a 95 Euro for a year while searching for another...and ended up with 2. We drove the 2 cars together, and we are sure there is no way to have an F50 w/o Tubi...but that's our opinions. Our wives were split, 1 liked and 1 didn't.

I'd think F40, F50, Enzo, CGT, Pagani are OTT cars, no?

Also, I love the sound of the CGT and prefer it over the F50. It could very well be that it is new to me, but there is just that certain shriek it has as it climbs toward the redline quickly...though it doesn't have the volume as the F50/Tubi in the tunnels...stands the hair up never the less.

(Note: I don't own the supercars, I take care of them and partial own a few of them, very small part)

 

Damn, who ARE you?! And didn't all MY95 F50 production to to the USA?

 

I think there were like 5-6 cars that were not US bound. I am not sure, will have to ask the broker. I know he had one converted, then all conversion stopped as Ferrari won the grey market suit...then it was overturned but the court ruled in Ferrari's favor to use only oem parts, and Ferrari of course made them difficult or impossible to get.

I am just a very lucky guy.

 

I believe the full system is headers, cat replacement test pipes, and mufflers. It was something like $9-10k.

 

There was a really good post about Tubi exhausts for F50's a while back:

http//ferrarichat.com/forum/showpost.php?p=134331020&postcount=4

 

You do not have to remap the ECU but there are modifications you can make.

 

We didn't do anywork to the ECU, just installation of the system, come to think of it, I am not sure what the shop did exactly...I just know the Tubis are in, it sounds good and drives good.

 

Full Tubi system, headers and all with the test pipes. Sound is incredible and no loss in torque was felt. I feel it compliments the engine sounds, not covers them up. With the full system the car sounds like it should.
Dave