550 Maranello Dyno Results

Stephens did all this.

Guess the Tubi won't bring any added HP, just you don't have the bypass valve anymore.
He put a different X-pipe instead, that apparently brought a huge HP hike, with the BMC filters.

 

This is an issue with many late model performance cars now. Adding exhaust alone makes little to no extra power and in several cases looses power. With the power loss, I’ve seen mostly on the greater factory HP per Liter engines. Part of the HP war these days with cars, exhaust is one of the first places they look for restrictions. Many factory setups no longer use crushed bends in the piping or very restrictive mufflers and are specifically engineered for the application, making it very hard to improve on.

These days, for most cars except very large displacement or forced induction, I consider a cat-back exhaust system a visual and audio modification more then anything else. Drop those cats and you will surely get the HP back, but likely more noise and smell. With full exhaust and intake modifications, cars usually benefit the most with a retune.

I’m sure it sounds great now though?

 

filters, center pipe and mufflers you will get about 45-50bhp.

--Dan

 

I've recently installed filters and an X pipe on my 550 and it "feels" noticably stronger. But since I've not dyno'd the package I can't actually say it IS stronger.

The sound also seems a bit more lively--however, unless I drove by at the same time as a car with stock set up, I don't think you'd actually know the difference.

 

I would suggest that you should see a slight gain in power outputs between the two. The Tubi box muffler (which is on my car) would likely lose 10hp over the standard muffler, but not the perforated pipes IMO.

 

Haaaaaaa. Imagine that. Spend $3500 to LOOSE power. Tubi = wasted money, in my book.

 

Car came with Tubi's. Do some searches here and have a look at the Tubi "design". Akin to the old "Turbo" mufflers of the 80's reflecting the soundwave to change the amplitude of the noise. **** design. I tried another brand that was a "straight through" performance muffler, in conjunction with losing the centre muffler, the car was just LOUD and annoying. Standard muffler is too heavy.

 

Why all the focus on hp? I have had experiences with Tubi decreasing hp. Less restrictive exhaust may lose a few hp on stock tuning, but can potentially increase torque. I prefer more and earlier torque for normal driving applications.

In building track cars, I have used multiple combinations of exhaust, 100 cell or sport cats, cat bypasses, chips, intakes, valve cuts, titanium this and that in upper end, fuel management systems and so on. I have found that certain combinations may knock a few ponies at higher RPMs, but spike torque earlier and increase total area under torque curve.

The lower back pressure may decrease hp and increase torque from stock numbers. You can potentially overcome the loss in power with tuning or an expensive fuel magement system. I had a Lenz system on an older Ruf which allowed more tuning points to overcome back pressure issues related to stock or limited tuning parameters.

 

I experienced a slight loss of low end power when I changed to Tubi's from OEM. It was noticeable .... but not significant. Your dyno results prove this.

 

I got mine here .... http://www.stebro.net/

It was about $ 600 for my 550 .... really improved the exhaust tone over the whole rpm range.

 

I have a stebro and would not recommend it.

--Dan

 

My 550 from Evo
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If you're going to spend money, it's hard to beat forced induction. My supercharged 308 dyno curve is almost exactly the same as Barts 550, mine looks a little flatter, but down about 10-15 ft-lbs torque. Just a thought.
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I don't understand all the hype about Tubi either, it reminds me of a glorified cherry bomb muffler you'd find on some guys IROC-Z in mid 80's. (Sing the lyrics to Phil Collin's "In the Air Tonight" to complete the visual)

But what are the other options. There's the Capristo which looks marginally better and then these Kreis-Seig exhaust that look like great pieces but they are equally pricey.

I don't know about the 550 specifically, but if the new F430's are anything like other current cars out there, there is almost zero HP gain in swapping exhaust alone. You'll need a couple of other mods and then reflash the ECU to take advantage of the uprated airflow.

 

Bart
Earlier this year I had my car dynoed on one of two dyno's I use regularly. Due to a problem with calibration of the dyno, it believed that I was only reaching 170kmh in 4th gear, when it actually does 192. Correspondingly my HP numbers dropped proportionately to the reduction in speed recorded.
This is, I assume, because HP is a function of torque, based on RPM. The redline on the 550 is under 7500rpm, but there is a cut to one engine bank at around 7250rpm. Your dealer should be able to confirm this, as does the factory workshop manual. The 7700rpm limit in the manual, is a typical Ferrari untruth, much like their max speed numbers.
This has been a very long winded explanation as to why I think your 550 numbers read much higher than expected.

 

Bottom line is $3500 and less HP. That sucks and I bet if people knew this before laying out the cash they might think twice. Technically the increase in airflow creating a lean condition effecting output should be compensated for by the ecu through the O2 sensors. Reflashing the ecu will then be a gain by itself and not so much a requirment to take advantage of the tubi. Therefore reflash the ecu, skip the tubi and buy an ansa instead that offers a better sound than stock or install test pipes and keep the stock system.

 

???
The fact is most people buy Tubi for the sound, not for extra power.

 

Agreed but not for less power with better sound. Imagine someone like myself plopping down $3500 for a tubi on my 308 and its slower, I would want to shove that muffler up someones crack. I always thought they were a waste of money unless you have too much and dont know where to spend it and now I know.