Daytona exhaust modifications

I have rebuilt quite a few Ansa origional exhausts for Daytona's, and they sound the same after rebuild. I have also spoken with Ansa, regarding their new generation Ansa exhausts that are currently coming on to the market, and the pipes are made of stainless, not mild steel, as well as some of the other componants. I was told this by Ansa. This is why the new systems don't sound the same as the origionals.
Gary Bobileff

 

I had new rear exhaust sections made up which deleted the rear resonators alltogether, just 2" pipe running into 2.5" tips, so looks stock from the rear. Put the original system away in case a future owner wants it. I have a stock (euro) front section. New rear pipes are easily 10Kg lighter and it has a nice scream above 4000 rpm, but isn't obtrusive for cruising. Only problem is it "booms" around 3000rpm with partial throttle opening. In hindsight, I should have had perforated tube and fiberglass sound deadening inside the tips, to reduce this resonance.

 

I have not had that request on Daytona systems, but I have done that on other Ansa systems, with successful results. But do remember, nothing will sound as the original system, except the original system itself, everything else will be a compromise.
Gary Bobileff

 

Another option is to use the rear Ansa section and have an exhaust shop make straight through straight pipes for the center section. There are several people using this set up. It gives a lot more volume than the stock system. Since the center section is nothing more than straight pipes the cost is low and it saves a ton of weight.

 

"Another option is to use the rear Ansa section and have an exhaust shop make straight through straight pipes for the center section."

I have done this, and like it very much. If you do this, be sure to have them make a crossover pipe on each side to join the two straight tubes going aft. This gets rid of a torque hole from 3500 to 5000 rpm that shows up when you remove the center mufflers.

I have engine dyno data to show the effects for the various configurations.

Sound is reasonable until you get on it. Then it scfreams quite loudly to redline!

See this: http://www.youtube.com/watch?v=0PFdkRPK8iA for an example of the max horsepower run with the street exhaust fitted.

 

The center sections on a USA Daytona Ansa ARE straight thru, but the pipes on the interior are perforated, and surrounded with sound deadening material.Then, there is a double layer outer surround which formulates the muffler outer skin. Obviously, cutting open the center sections would have no benefit, unless all the sound deadening material was removed. Then, it's a matter of experimentation regarding sound, as well as proper back pressure in the exhaust, so you don't have back fires on decelleration. It's not suggested.
Gary Bobileff

 

hey guys...

We're in the process of doing a rebuild on a daytona exhaust, saw this thread and figured i'd throw some pics of the progress as of today this morning.
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That's a euro exhaust, same as my car. Now I understand why the small diameter side pipes are so hard to keep sealed where they meet the headers, they appear to go into a sealed chamber, so must have huge back pressure.

I have tried many types of gasket material on the flat flange joint, but they leak in no time.

 

Chuck..

Yes please send pics and I we'll get together with our fabricator and get you over a price.

thanks,
-Carlo
Bobileff Motorcar

 

as of this morning...
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and the rebuild continues...
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another day.....
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gary,
on daytonas, was the inside of the chrome tip painted orange? is that what the judges expect to see?
tia,
ed

 

As manufactured - orange.

I do not know a judge that takes off for driven cars that are black. Maybe at Pebble Beach, but a normal Daytona production car (coupe or spyder) would normally never hit that field for judging.

Note: NOT referring to any NEW ANSA production products.

 

I agree with Tom, but going the extra step to make the inside orange at show time never hurts! Judges like proper details, particularly if it's a really close score between the 1st and 2nd place car, or possible a tie breaker.
Gary Bobileff

 

Here's the system before we're going to throw it up on the car!
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carlor,
just curious, how much does a system like that weigh? no wonder the daytona is such a heavy car.
ed

 

gary,
is there a special hi temp orange paint you recommend?
ed

 

The orange paint doesn't have to be "hi temp", because it will turn black almost immediately after start up from exhaust soot! Just kidding! But it's true. I've used a hi temp Chevy orange engine enamel by Krylon, in a spray bomb.
Gary Bobileff

 

I realise that I’m resurrecting a very old thread, but does anyone have a recording or video of a Daytona with the centre sections of the exhausts replaced by straight through pipes?

It was recommended earlier in this thread that a balance pipe be fitted between each pair of straight through pipes to avoid a flat spot. Does it need to be anywhere specific i.e. a fixed distance from the front flange, and is a simple perpendicular pipe of the same diameter okay?

thank you,
Paul

 

https://www.ferrarichat.com/forum/threads/daytona-exhaust-tone.685603/

Some good information here.

 

Hi Mike, yes, I was the OP on that thread.

Thanks,
Paul