Modifying the Testarossa exhaust.

Testarossa Lover: Go ahead and install pipes in place of the convertors, it will help. I've heard that the most restrictive parts of the TR's exhaust system is the Precats...unless they have been hollowed out. The precats have a sort of chain-mail inside them that helps get the exhaust up to temp quicker for reduced emissions. This chain-mail crap really impedes flow.

You should have O2 Sensors on your cat replacement pipes, so the fuel system can adjust as needed. I'd say go for it!

 

Good, I get her to rumble now.

 

If the exhaust system has such low restriction it could lean out the engine to the point that the fuel injection system can't compensate enough. There are limits to the original design parameters. Running too lean will over heat the exhaust and burn the pistons.

My TR had hollowed out precats and Stebro converter replacement tubes. Great sounds and in picked up some power.

 

Strange that it looses so much, it something like 20%
Was a measurement taken before the removal of the parts so they had an like for like test?

I believe that Ferrari often over estimate the power of its cars so the first time you test the car on a dyno it has already "lost" horsepower it never had

Do you think Lambo could have done the same?

Gorgeous car by the way, I love the purple colour, if I could afford another car it would be that one.

P

 

SUNRACER...yes that can happen, the TR's fuel system can only compensate so much. As I said in a previous post, that the fuel system must have it's base-line parameters reset for drastic exhaust system changes.

 

ok, in the meantime enjoy the flyby sound of my testarossa on the racetrack

http://youtu.be/HFwgwQCJ6l4

 

and again...

http://www.youtube.com/watch?NR=1&v=mix10FClAAQ

 

I LIKE TO THINK THAT I'M AN EXPERT ON SUPERCAR EXHAUST SOUNDS (AS BIG HEADED AS IT SEEMS), AND I RECKON THAT IS POSSIBLY THE MOST PHENOMENAL NOISE I'VE EVER HEARD YET. YOUR EXHAUST APPEARS TO REMAIN TUNEFUL AND SWEET SOUNDING NO MATTER HOW HARD YOU REV IT OR FLOOR IT. NOT LIKE THESE OTHER HARSH SOUNDING SPORTS EXHAUSTS LIKE X-OST (AN ABSOLUTE RACKET/PAINFUL ON THE EARS). THE BIG QUESTION WITH YOUR EXHAUST IS - LOSS OF HORSEPOWER OR GAIN?

 

Thank you Dan Can't get enough of it too!

I raced it a week ago on Zandvoort racingtrack (ex GP track) and this weekend at the Assen moto GP track in Holland and I had enough power to keep up with every new type Ferrari there, no problem .. It runs and it runs and as you can hear in the last video, no flat spot at any rpm... My only problem is the brakes... I never had a car with brakes that bad. After one lap the steering wheel started shaking so that I had to slow down a lot earlier and lose my position just before the corners. This winter I install some 8 pot MovÍT calipers with aluminum bell mouted discs.

 

FUNNILY ENOUGH, WILLIAM H THOUGHT THE SAME WITH HIS TR SO HE FITTED FERRARI F50 BRAKES AND NOW IT STOPS ON A DIME.

 

KOENIG REPLACEMENT BRAKES FOR THE TESTAROSSA ARE MEANT TO BE ABSOLUTELY AMAZING...

http://www.koenig-specials.com/bilder/bilder600px/600html/competition032.html

http://www.koenig-specials.com/homepage%20neu/navigation%20neu%20englisch.htm

 

Great video.. You could have winded her out a bit more.. Take her to the edge my man.. They love it..

R

 

Just to enjoy:

[ame]http://www.youtube.com/watch?v=jVYxjKyqHFA&feature=related[/ame]

 

Very cool. I saw the 360 trying to take you on... Did he pull back at the turn?

 

Yessss!!

 

this is rwhp not flywheel!

the number is more or less correct for a jota car

 

This replaces most of the original system, right? Yeah, where should you install the O2 sensors? I think Ferrari installed them on the location they did for a reason. For sure there is concern not to overheat these parts and I know they are rated for 500 Deg/C in temperature. My point is, should you place them closer by the header, the gas flow "upstream" has yet to lose its energy and they sustain conditions that are much harsher. A second thing is, they are mounted sideways for example, and never placed at the underside of a pipe. That's because of moisture, their second mortal enemy.
Running the engine without the sensors is possible. To tell the computer the mixture is right, hence you replace the signal that was discarded, is all that is required in theory. It can be done with printed circuit boards that find use in conjunction with nitro boosted engines etc. Please note. These sensors (=narrow band) at idle, they cycle the mixture sort of speak. At full throttle, they do nothing! Hope this helps.

 

IT CAN'T BE, BECAUSE WHEN ROYTOY CHANGED THE EXHAUST OVER BACK TO THE OEM/STOCK EXHAUST THE POWER FIGURES INCREASED.

 

Hello Dan; Can you PLEASE!!! turn the "caps" off when you type.......Mark

 

Ha ha! OK just a bad habit that stayed with me. How's this? LOL

 

Thanks Dan....a "bad habit" is not driving your Testarossa enough....as far as customizing/altering the Testarossa exhaust.....I made my own custom exhaust, eliminated both the cats and pre-cats by welding a appropriate sized pipe and length to replace the cats and pre-cats, then for the muffler utilized a "Flow Master" muffler, welded the bungs for the O2 sensors, and for about $200.00 in parts and my labor, I have an exhaust system and more importantly to myself, a sound (F1) that rivals any exhaust out there. I have been to many Ferrari gatherings and have recieved nothing but compliments and many astounded listeners. I don't believe thousands of dollars needs to be spent to achieve a "F1" sound, just some time a few lengths of pipe & a Flowmaster muffler. I will try to post my exhaust sound, I'm Great at mods....like a 3rd grader with a computer....Here's a video from a Ferrari gathering. My car is the white Testarossa....you can hear the car leaving the dealership at 2:12 of the video...and also doing a drive by at 2:25....notice the front end lift from the torque of the motor as I accelerate.....Mark
[ame]http://www.youtube.com/watch?v=_UQkr_x-Y9k&feature=related[/ame]

 

Red Head Seeker,
Sounds great! Can you provide any details on how you fitted the Flow Masters and which ones you used? I eliminated my cats and gutted the pre-cats but the sound did not change much from before, probably because I used the stock muffler, so I am thinking about going your route.

 

Here's the link. The Flow Master muffler was almost the exact size as the stock Testarossa exhaust as were the inlet & outlet locations. I was able to get a stock Testarossa muffler at a GREAT price from a fellow F-Chatter. I then cut the muffler apart and "carefully" removed (lot's of grinding) the inlets and outlets, and then welded them to the "Flow Master" muffler. Some brackets were made and welded to the new muffler (simple)....and AMAZINGLY!!, since the inlet and outlet locations were very close, the dual exhaust tips located themselves "Perfectly" in the factory location. It was almost if the Flow Master muffler was an "Exact" replacement factory muffler. I also have removed the stock Ferrari air cleaner and inlet, and replaced with "Dual cylinder shaped over-sized K&L air filters, utilizing flexable metal tubing that is located down in the engine compartment next to the wheels. One flexable tubing per throttle body. I also built a stainless steel "Heat Shield" that mounts between the muffler & motor to seperate the muffler heat from the area where the cold air intakes are mounted. I NEVER liked the stock Ferrari air filter location....If "Heat" travels up.....Why mount the air filter on top of the motor/exhaust heat?.....that is why I relocated the "New" dual air filters as far "Down" as possible. With the combination of the custom exhaust & dual cold air intakes the difference in performance, gains in horsepower, sound, instant throttle response, is "AMAZING"!!!....Like I stated.....watch the "Front-End Lift" during acceleration in the video....that's "Horsepower"!!!.....car revs to 7,200+++ in the "Blink of the Eye". I almost forgot to mention VinceP, that when I cut apart trhe stock Ferrari muffler...you would be surprised & disapointed at how restrictive & baffled the stock muffler is, that is why you are hearing no Sound change....you have opened up your exhaust system by gutting the cats and pre-cats....THEN!!! the stock muffler restricts the "improvements".....Mark
http://www.flowmastermufflers.com/searchfmm/inoutlet.php?inlet_pos=Dual&outlet_pos=Dual&inlet_dia1=2.5&outlet_dia1=2.5&search=1&inlet_dia=2.5&outlet_dia=2.5

 

Hey Mark - do you have any sound clips of your exhaust system from behind the car? It sounds great coming at you....how about going off into the distance.....?