A challenge to TUBI -- Tell us the truth, with data!

Can't comment about HP on a Ferrari, but there was a famous exhaust dyno on a Porsche forum once that showed a Tubi on a 996TT LOST 4 hp because of the restrictive design.

They sound great though

 

And all along I was thinking that ANYTHING would help a 996!

 

It will be interesting to see what appears on this thread.
Keith

 

Tubi is one of the most beautiful sounds i've ever heard... Tubi proved their mettle(/metal) with the 550...

 

Power? Hmmm... Never thought about that... I got it for the sound!

 

You might not see it on the newer Ferrari models - I'm pretty sure Ferrari engineers have taken exhaust flow into account since the 348/355 were on the drawing boards. I believe the benefits provided by new, higher-flow exhaust systems will be recognized by cars that are actually hampered by existing OEM setups - TRs, 308/328, 512BBis, 400/412, cars whose exhaust systems were hit with added requirements by US Emissions Standards but were not part of the original engine designs. These cars would probably show a boost in real-world HP gains if they had more exhaust flow. The engines would probably run cooler, too....

 

If you write to mille-miglia by their web cite I am sure they have data on their tubi equivalent which IMO is better than the tubi see mille-miglia.com.au

 

i have had a few ferrari's with sports exhaust but not a tubi as far as i have noticed they just SOUND faster and more powerfull and that is it thats why they probably wont respond to your email

 

How can you tell if an exhaust system 'sounds faster and more powerful' especially if you have never owned a tubi?

 

I have tried the mille-miglia on my previous 550. The tone and noise was unbearable IMO.

 

In Forza magazine some time ago there were dyno sheets of a 308 GT4 engine with original ANSA exhaust and after fitting a Tubi. Since I am not at home now, I can't go and find the details but if memory serves me correct there was some HP gain

 

come on tubi...you are being outed!

btw, i always hate when somebody says i have a tubi...kinda reminds me of a guy walking around w/ a woodie.

not a vision i want to think about when talking about ferraris. at the very least tubi...change that bloody name!!!

 

chris, i know...it's terrible. i've had to start looking at larini and bell systems for my boxer.

i just could not take it!! lol

 

I just read my own post "I put a Stebro on my car" now I am going to have that same visualization everytime I read "I have a Stebro"

 

On my TR I had a Borla system for a while and it seemed to give a little more power in the mid-range and top end. Then I re-installed the factory system which has gutted precats and cats, and I could feel a slight drop in power. The Borla is a straight through system and does a very good job. In my opinion, if the biggest flow restriction in the exhaust system is the cat convertors, then it wouldn't make any difference changing any component downstream of this. So factory muffler or aftermarket will not really change things. If the muffler is indeed the biggest restriction and the cats are at 90% (not 100%) of their max flow....then another muffler "may" increase things just a tad....but you probably couldn't tell by perceptions. There a lot of factors in the exhaust system the could skew the outcome. Maybe the only way to compare Tubi to other systems for sure is to flow test them side by side. But then again since exhaust gas flows in pulses....this too could affect the results. Hmmm...I think I'm just confusing myself here.

 

fwiw, i noticed no material seat-of-the-pants performance difference between stock and tubi cans on my 550. but the audio upgrade alone was worth the price of entry. i seem to recall someone saying that the tubi cans decreased 550 output very slightly, but couldn't swear to it.

it'd be interesting to start a poll to find out whether people changed their exhaust setups primarily for audio improvements or for power improvements.

doody.

 

Same here...and the looks of the Tubi don't hurt a bit either.

 

Rob's point is very well taken, and from the standpoint of muffler efficiencies I speak from extensive on-hand and practical experience.

It is very difficult to publish horsepower gains since, as Rob points out, there is great variance in vehicles, and it does not make sense to rely on published specs either.

You would have to know absolutely everything about the vehicle to vaidate the test.

Many times in this forum knowledgeable folks have cautioned, and very wisely so, against claims of ECU upgrades.

The same applies to muffler designs, and I find folks spending huge dollars for the "sound" of the muffler rather than concerning themselves with the actual efficiency and overall value of the product!

Case in point: one free flow muffler product for a VW bug presented to me for testing had tremendous claims about HP gains, etc. Upon first inspection, however, it was obvious this was a bogus muffler, because the cast iron inlet pieces on the muffler which bolted to the engine heads had 5/8" diameter inlets. The pipes on the muffler were 1 1/4". The inlet restriction was overwhelming, and there could not possibly be any gain with this muffler.

These are the important things you have to examine. Are the manufacturer's offerings claims or fact? Do you believe everything someone tells you?

One here mentioned a HP decrease on a Porsche from a muffler, but what a sound. What a schmuck to buy this product!

Again, rear engine car mufflers are the most difficult to tune. Noise and expensive mufflers do not equate to HP gain. Period!

Riverflyer did a great article on 8/14/2005 on his muffelr experiences, and again posted additional results in the Nor Cal section.

Read these. They make considerable CREDIBLE sense. The car now performs beyond expectations, and John knows the difference. He doesn't need a Dyno to tell him what's going on. He senses the difference in the car's efficiency.

TUBI is, most likely, not going to give anyone results. Why should they? People are buying the product on blind faith. So, why upset the balance!

 

Somebody likes to stir up trouble:
http://www.ferrarichat.com/forum/showthread.php?t=83728

 

Here's my before and after in another thread:

Paul

http://ferrarichat.com/forum/showthread.php?t=83788